sif: use upstream sif module

Signed-off-by: Adam Hughes <stickmanica@gmail.com>

go.mod

@@ -16,7 +16,6 @@ require (
 	github.com/docker/libtrust v0.0.0-20160708172513-aabc10ec26b7 // indirect
 	github.com/ghodss/yaml v1.0.0
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/google/uuid v1.3.0 // indirect
 	github.com/gorilla/mux v1.7.4 // indirect
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/imdario/mergo v0.3.12
@@ -30,18 +29,17 @@ require (
 	github.com/opencontainers/selinux v1.10.0
 	github.com/ostreedev/ostree-go v0.0.0-20190702140239-759a8c1ac913
 	github.com/pkg/errors v0.9.1
-	github.com/satori/go.uuid v1.2.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0
+	github.com/sylabs/sif/v2 v2.3.0
 	github.com/ulikunitz/xz v0.5.10
 	github.com/vbatts/tar-split v0.11.2
 	github.com/vbauerster/mpb/v7 v7.3.0
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190809123943-df4f5c81cb3b // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0
 	go.etcd.io/bbolt v1.3.6
-	go.opencensus.io v0.23.0 // indirect
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
-	golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3
+	golang.org/x/net v0.0.0-20211005001312-d4b1ae081e3b
-	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/sys v0.0.0-20211214234402-4825e8c3871d
 	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1

go.sum

@@ -10,17 +10,33 @@ cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6T
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 cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
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+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
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+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/14rcole/gopopulate v0.0.0-20180821133914-b175b219e774 h1:SCbEWT58NSt7d2mcFdvxC9uyrdcTfvBbPLThhkDmXzg=
 github.com/14rcole/gopopulate v0.0.0-20180821133914-b175b219e774/go.mod h1:6/0dYRLLXyJjbkIPeeGyoJ/eKOSI0eU6eTlCBYibgd0=
@@ -66,6 +82,8 @@ github.com/Microsoft/hcsshim/test v0.0.0-20201218223536-d3e5debf77da/go.mod h1:5
 github.com/Microsoft/hcsshim/test v0.0.0-20210227013316-43a75bb4edd3/go.mod h1:mw7qgWloBUl75W/gVH3cQszUg1+gUITj7D6NY7ywVnY=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
+github.com/ProtonMail/go-crypto v0.0.0-20210920160938-87db9fbc61c7/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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@@ -73,13 +91,19 @@ github.com/VividCortex/ewma v1.2.0 h1:f58SaIzcDXrSy3kWaHNvuJgJ3Nmz59Zji6XoJR/q1o
 github.com/VividCortex/ewma v1.2.0/go.mod h1:nz4BbCtbLyFDeC9SUHbtcT5644juEuWfUAUnGx7j5l4=
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+github.com/acomagu/bufpipe v1.0.3/go.mod h1:mxdxdup/WdsKVreO5GpW4+M/1CE2sMG4jeGJ2sYmHc4=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
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@@ -90,8 +114,10 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
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+github.com/bketelsen/crypt v0.0.4/go.mod h1:aI6NrJ0pMGgvZKL1iVgXLnfIFJtfV+bKCoqOes/6LfM=
 github.com/blang/semver v3.1.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
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+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
 github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
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@@ -119,6 +145,7 @@ github.com/cilium/ebpf v0.4.0/go.mod h1:4tRaxcgiL706VnOzHOdBlY8IEAIdxINsQBcU4xJJ
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+github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
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@@ -234,6 +261,7 @@ github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfc
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@@ -275,15 +303,19 @@ github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25Kn
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@@ -293,6 +325,12 @@ github.com/garyburd/redigo v0.0.0-20150301180006-535138d7bcd7/go.mod h1:NR3MbYis
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@@ -338,6 +376,9 @@ github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
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@@ -353,6 +394,7 @@ github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QD
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@@ -361,6 +403,7 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
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@@ -373,11 +416,19 @@ github.com/google/go-intervals v0.0.2/go.mod h1:MkaR3LNRfeKLPmqgJYs4E66z5InYjmCj
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@@ -403,18 +454,34 @@ github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgf
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@@ -423,18 +490,23 @@ github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
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@@ -449,6 +521,7 @@ github.com/klauspost/pgzip v1.2.5/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQ
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@@ -456,16 +529,21 @@ github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
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@@ -476,12 +554,20 @@ github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lL
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@@ -507,6 +593,7 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8m
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@@ -556,16 +643,20 @@ github.com/opencontainers/selinux v1.10.0 h1:rAiKF8hTcgLI3w0DHm6i0ylVVcOrlgR1kK9
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@@ -681,6 +789,8 @@ github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17
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@@ -691,8 +801,11 @@ github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17
 github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
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@@ -702,34 +815,47 @@ go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
 go.etcd.io/bbolt v1.3.6 h1:/ecaJf0sk1l4l6V4awd65v2C3ILy7MSj+s/x1ADCIMU=
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 go.etcd.io/etcd v0.5.0-alpha.5.0.20200910180754-dd1b699fc489/go.mod h1:yVHk9ub3CSBatqGNg7GRmsnfLWtoW60w4eDYfh7vHDg=
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+go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
+go.etcd.io/etcd/client/v2 v2.305.0/go.mod h1:h9puh54ZTgAKtEbut2oe9P4L/oqKCVB6xsXlzd7alYQ=
 go.mozilla.org/pkcs7 v0.0.0-20200128120323-432b2356ecb1 h1:A/5uWzF44DlIgdm/PQFwfMkW0JX+cIcQi/SwLAmZP5M=
 go.mozilla.org/pkcs7 v0.0.0-20200128120323-432b2356ecb1/go.mod h1:SNgMg+EgDFwmvSmLRTNKC5fegJjB7v23qTQ0XLGUNHk=
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@@ -752,6 +878,8 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -760,11 +888,16 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
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@@ -777,6 +910,7 @@ golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR
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@@ -788,35 +922,56 @@ golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLL
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@@ -954,12 +1143,26 @@ google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsb
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@@ -980,10 +1183,31 @@ google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150/go.mod h1:n3cpQtvx
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@@ -998,10 +1222,18 @@ google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQ
 google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
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@@ -1024,13 +1256,16 @@ gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLks
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@@ -1038,6 +1273,7 @@ gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76
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@@ -1048,8 +1284,9 @@ gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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@@ -1061,6 +1298,7 @@ honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 k8s.io/api v0.20.1/go.mod h1:KqwcCVogGxQY3nBlRpwt+wpAMF/KjaCc7RpywacvqUo=
 k8s.io/api v0.20.4/go.mod h1:++lNL1AJMkDymriNniQsWRkMDzRaX2Y/POTUi8yvqYQ=
 k8s.io/api v0.20.6/go.mod h1:X9e8Qag6JV/bL5G6bU8sdVRltWKmdHsFUGS3eVndqE8=

sif/internal/sif_util.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package internal
@@ -13,56 +14,54 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/containers/image/v5/sif/sif"
 	"github.com/pkg/errors"
+	"github.com/sylabs/sif/v2/pkg/sif"
 
 	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
 type SifImage struct {
-	fimg      sif.FileImage
+	fimg      *sif.FileImage
-	rootfs    *sif.Descriptor
+	rootfs    sif.Descriptor
 	deffile   *sif.Descriptor
-	defReader *io.SectionReader
+	defReader io.Reader
 	cmdlist   []string
 	runscript *bytes.Buffer
 	env       *sif.Descriptor
-	envReader *io.SectionReader
+	envReader io.Reader
 	envlist   []string
 }
 
 func LoadSIFImage(path string) (image SifImage, err error) {
 	// open up the SIF file and get its header
-	image.fimg, err = sif.LoadContainer(path, true)
+	image.fimg, err = sif.LoadContainerFromPath(path, sif.OptLoadWithFlag(os.O_RDONLY))
 	if err != nil {
 		return
 	}
 
 	// check for a system partition and save it
-	image.rootfs, _, err = image.fimg.GetPartPrimSys()
+	image.rootfs, err = image.fimg.GetDescriptor(sif.WithPartitionType(sif.PartPrimSys))
 	if err != nil {
 		return SifImage{}, errors.Wrap(err, "looking up rootfs from SIF file")
 	}
 
 	// look for a definition file object
-	searchDesc := sif.Descriptor{Datatype: sif.DataDeffile}
+	resultDesc, err := image.fimg.GetDescriptor(sif.WithDataType(sif.DataDeffile))
-	resultDescs, _, err := image.fimg.GetFromDescr(searchDesc)
+	if err == nil {
-	if err == nil && resultDescs != nil {
 		// we assume in practice that typical SIF files don't hold multiple deffiles
-		image.deffile = resultDescs[0]
+		image.deffile = &resultDesc
-		image.defReader = io.NewSectionReader(image.fimg.Fp, image.deffile.Fileoff, image.deffile.Filelen)
+		image.defReader = resultDesc.GetReader()
 	}
 	if err = image.generateConfig(); err != nil {
 		return SifImage{}, err
 	}
 
 	// look for an environment variable set object
-	searchDesc = sif.Descriptor{Datatype: sif.DataEnvVar}
+	resultDesc, err = image.fimg.GetDescriptor(sif.WithDataType(sif.DataEnvVar))
-	resultDescs, _, err = image.fimg.GetFromDescr(searchDesc)
+	if err == nil {
-	if err == nil && resultDescs != nil {
 		// we assume in practice that typical SIF files don't hold multiple EnvVar sets
-		image.env = resultDescs[0]
+		image.env = &resultDesc
-		image.envReader = io.NewSectionReader(image.fimg.Fp, image.env.Fileoff, image.env.Filelen)
+		image.envReader = resultDesc.GetReader()
 	}
 
 	return image, nil
@@ -171,11 +170,11 @@ func (image SifImage) UnloadSIFImage() (err error) {
 }
 
 func (image SifImage) GetSIFID() string {
-	return image.fimg.Header.ID.String()
+	return image.fimg.ID()
 }
 
 func (image SifImage) GetSIFArch() string {
-	return sif.GetGoArch(string(image.fimg.Header.Arch[:sif.HdrArchLen-1]))
+	return image.fimg.PrimaryArch()
 }
 
 const squashFilename = "rootfs.squashfs"
@@ -214,15 +213,12 @@ func (image *SifImage) writeRunscript(tempdir string) (err error) {
 }
 
 func (image SifImage) SquashFSToTarLayer(tempdir string) (tarpath string, err error) {
-	if _, err = image.fimg.Fp.Seek(image.rootfs.Fileoff, 0); err != nil {
-		return
-	}
 	f, err := os.Create(filepath.Join(tempdir, squashFilename))
 	if err != nil {
 		return
 	}
 	defer f.Close()
-	if _, err = io.CopyN(f, image.fimg.Fp, image.rootfs.Filelen); err != nil {
+	if _, err = io.CopyN(f, image.rootfs.GetReader(), image.rootfs.Size()); err != nil {
 		return
 	}
 	if err = f.Sync(); err != nil {

sif/sif/LICENSE.md

@@ -1,27 +0,0 @@
-Copyright (c) 2018, Sylabs Inc. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice,
-   this list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its
-   contributors may be used to endorse or promote products derived from this
-   software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.

sif/sif/create.go

@@ -1,575 +0,0 @@
-// Copyright (c) 2018, Sylabs Inc. All rights reserved.
-// Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
-// Copyright (c) 2017, Yannick Cote <yhcote@gmail.com> All rights reserved.
-// This software is licensed under a 3-clause BSD license. Please consult the
-// LICENSE file distributed with the sources of this project regarding your
-// rights to use or distribute this software.
-
-// +build linux
-
-package sif
-
-import (
-	"bytes"
-	"encoding/binary"
-	"encoding/hex"
-	"fmt"
-	"io"
-	"os"
-	"os/user"
-	"path"
-	"strconv"
-	"time"
-)
-
-// Find next offset aligned to block size
-func nextAligned(offset int64, align int) int64 {
-	align64 := uint64(align)
-	offset64 := uint64(offset)
-
-	if offset64%align64 != 0 {
-		offset64 = (offset64 & ^(align64 - 1)) + align64
-	}
-
-	return int64(offset64)
-}
-
-// Set file pointer offset to next aligned block
-func setFileOffNA(fimg *FileImage, alignment int) (int64, error) {
-	offset, err := fimg.Fp.Seek(0, 1) // get current position
-	if err != nil {
-		return -1, fmt.Errorf("seek() getting current file position: %s", err)
-	}
-	aligned := nextAligned(offset, alignment)
-	offset, err = fimg.Fp.Seek(aligned, 0) // set new position
-	if err != nil {
-		return -1, fmt.Errorf("seek() getting current file position: %s", err)
-	}
-	return offset, nil
-}
-
-// Get current user and returns both uid and gid
-func getUserIDs() (int64, int64, error) {
-	u, err := user.Current()
-	if err != nil {
-		return -1, -1, fmt.Errorf("getting current user info: %s", err)
-	}
-
-	uid, err := strconv.Atoi(u.Uid)
-	if err != nil {
-		return -1, -1, fmt.Errorf("converting UID: %s", err)
-	}
-
-	gid, err := strconv.Atoi(u.Gid)
-	if err != nil {
-		return -1, -1, fmt.Errorf("converting GID: %s", err)
-	}
-
-	return int64(uid), int64(gid), nil
-}
-
-// Fill all of the fields of a Descriptor
-func fillDescriptor(fimg *FileImage, index int, input DescriptorInput) (err error) {
-	descr := &fimg.DescrArr[index]
-
-	curoff, err := fimg.Fp.Seek(0, 1)
-	if err != nil {
-		return fmt.Errorf("while file pointer look at: %s", err)
-	}
-
-	descr.Datatype = input.Datatype
-	descr.ID = uint32(index) + 1
-	descr.Used = true
-	descr.Groupid = input.Groupid
-	descr.Link = input.Link
-	align := os.Getpagesize()
-	if input.Alignment != 0 {
-		align = input.Alignment
-	}
-	descr.Fileoff, err = setFileOffNA(fimg, align)
-	if err != nil {
-		return
-	}
-	descr.Filelen = input.Size
-	descr.Storelen = descr.Fileoff + descr.Filelen - curoff
-	descr.Ctime = time.Now().Unix()
-	descr.Mtime = time.Now().Unix()
-	descr.UID, descr.Gid, err = getUserIDs()
-	if err != nil {
-		return fmt.Errorf("filling descriptor: %s", err)
-	}
-	descr.SetName(path.Base(input.Fname))
-	descr.SetExtra(input.Extra.Bytes())
-
-	// Check that none or only 1 primary partition is ever set
-	if descr.Datatype == DataPartition {
-		ptype, err := descr.GetPartType()
-		if err != nil {
-			return err
-		}
-		if ptype == PartPrimSys {
-			if fimg.PrimPartID != 0 {
-				return fmt.Errorf("only 1 FS data object may be a primary partition")
-			}
-			fimg.PrimPartID = descr.ID
-			arch, err := descr.GetArch()
-			if err != nil {
-				return err
-			}
-			copy(fimg.Header.Arch[:], arch[:])
-		}
-	}
-
-	return
-}
-
-// Write new data object to the SIF file
-func writeDataObject(fimg *FileImage, index int, input DescriptorInput) error {
-	// if we have bytes in input.data use that instead of an input file
-	if input.Data != nil {
-		if _, err := fimg.Fp.Write(input.Data); err != nil {
-			return fmt.Errorf("copying data object data to SIF file: %s", err)
-		}
-	} else {
-		if n, err := io.Copy(fimg.Fp, input.Fp); err != nil {
-			return fmt.Errorf("copying data object file to SIF file: %s", err)
-		} else if n != input.Size && input.Size != 0 {
-			return fmt.Errorf("short write while copying to SIF file")
-		} else if input.Size == 0 {
-			// coming in from os.Stdin (pipe)
-			descr := &fimg.DescrArr[index]
-			descr.Filelen = n
-			descr.SetName("pipe" + fmt.Sprint(index+1))
-		}
-	}
-
-	return nil
-}
-
-// Find a free descriptor and create a memory representation for addition to the SIF file
-func createDescriptor(fimg *FileImage, input DescriptorInput) (err error) {
-	var (
-		idx int
-		v   Descriptor
-	)
-
-	if fimg.Header.Dfree == 0 {
-		return fmt.Errorf("no descriptor table free entry")
-	}
-
-	// look for a free entry in the descriptor table
-	for idx, v = range fimg.DescrArr {
-		if !v.Used {
-			break
-		}
-	}
-	if int64(idx) == fimg.Header.Dtotal-1 && fimg.DescrArr[idx].Used {
-		return fmt.Errorf("no descriptor table free entry, warning: header.Dfree was > 0")
-	}
-
-	// fill in SIF file descriptor
-	if err = fillDescriptor(fimg, idx, input); err != nil {
-		return
-	}
-
-	// write data object associated to the descriptor in SIF file
-	if err = writeDataObject(fimg, idx, input); err != nil {
-		return fmt.Errorf("writing data object for SIF file: %s", err)
-	}
-
-	// update some global header fields from adding this new descriptor
-	fimg.Header.Dfree--
-	fimg.Header.Datalen += fimg.DescrArr[idx].Storelen
-
-	return
-}
-
-// Release and write the data object descriptor to backing storage (SIF container file)
-func writeDescriptors(fimg *FileImage) error {
-	// first, move to descriptor start offset
-	if _, err := fimg.Fp.Seek(DescrStartOffset, 0); err != nil {
-		return fmt.Errorf("seeking to descriptor start offset: %s", err)
-	}
-
-	for _, v := range fimg.DescrArr {
-		if err := binary.Write(fimg.Fp, binary.LittleEndian, v); err != nil {
-			return fmt.Errorf("binary writing descrtable to buf: %s", err)
-		}
-	}
-	fimg.Header.Descrlen = int64(binary.Size(fimg.DescrArr))
-
-	return nil
-}
-
-// Write the global header to file
-func writeHeader(fimg *FileImage) error {
-	// first, move to descriptor start offset
-	if _, err := fimg.Fp.Seek(0, 0); err != nil {
-		return fmt.Errorf("seeking to beginning of the file: %s", err)
-	}
-
-	if err := binary.Write(fimg.Fp, binary.LittleEndian, fimg.Header); err != nil {
-		return fmt.Errorf("binary writing header to buf: %s", err)
-	}
-
-	return nil
-}
-
-// CreateContainer is responsible for the creation of a new SIF container
-// file. It takes the creation information specification as input
-// and produces an output file as specified in the input data.
-func CreateContainer(cinfo CreateInfo) (fimg *FileImage, err error) {
-	fimg = &FileImage{}
-	fimg.DescrArr = make([]Descriptor, DescrNumEntries)
-
-	// Prepare a fresh global header
-	copy(fimg.Header.Launch[:], cinfo.Launchstr)
-	copy(fimg.Header.Magic[:], HdrMagic)
-	copy(fimg.Header.Version[:], cinfo.Sifversion)
-	copy(fimg.Header.Arch[:], HdrArchUnknown)
-	copy(fimg.Header.ID[:], cinfo.ID[:])
-	fimg.Header.Ctime = time.Now().Unix()
-	fimg.Header.Mtime = time.Now().Unix()
-	fimg.Header.Dfree = DescrNumEntries
-	fimg.Header.Dtotal = DescrNumEntries
-	fimg.Header.Descroff = DescrStartOffset
-	fimg.Header.Dataoff = DataStartOffset
-
-	// Create container file
-	fimg.Fp, err = os.OpenFile(cinfo.Pathname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
-	if err != nil {
-		return nil, fmt.Errorf("container file creation failed: %s", err)
-	}
-	defer fimg.Fp.Close()
-
-	// set file pointer to start of data section */
-	if _, err = fimg.Fp.Seek(DataStartOffset, 0); err != nil {
-		return nil, fmt.Errorf("setting file offset pointer to DataStartOffset: %s", err)
-	}
-
-	for _, v := range cinfo.InputDescr {
-		if err = createDescriptor(fimg, v); err != nil {
-			return
-		}
-	}
-
-	// Write down the descriptor array
-	if err = writeDescriptors(fimg); err != nil {
-		return
-	}
-
-	// Write down global header to file
-	if err = writeHeader(fimg); err != nil {
-		return
-	}
-
-	return
-}
-
-func zeroData(fimg *FileImage, descr *Descriptor) error {
-	// first, move to data object offset
-	if _, err := fimg.Fp.Seek(descr.Fileoff, 0); err != nil {
-		return fmt.Errorf("seeking to data object offset: %s", err)
-	}
-
-	var zero [4096]byte
-	n := descr.Filelen
-	upbound := int64(4096)
-	for {
-		if n < 4096 {
-			upbound = n
-		}
-
-		if _, err := fimg.Fp.Write(zero[:upbound]); err != nil {
-			return fmt.Errorf("writing 0's to data object")
-		}
-		n -= 4096
-		if n <= 0 {
-			break
-		}
-	}
-
-	return nil
-}
-
-func resetDescriptor(fimg *FileImage, index int) error {
-	// If we remove the primary partition, set the global header Arch field to HdrArchUnknown
-	// to indicate that the SIF file doesn't include a primary partition and no dependency
-	// on any architecture exists.
-	_, idx, _ := fimg.GetPartPrimSys()
-	if idx == index {
-		fimg.PrimPartID = 0
-		copy(fimg.Header.Arch[:], HdrArchUnknown)
-	}
-
-	offset := fimg.Header.Descroff + int64(index)*int64(binary.Size(fimg.DescrArr[0]))
-
-	// first, move to descriptor offset
-	if _, err := fimg.Fp.Seek(offset, 0); err != nil {
-		return fmt.Errorf("seeking to descriptor: %s", err)
-	}
-
-	var emptyDesc Descriptor
-	if err := binary.Write(fimg.Fp, binary.LittleEndian, emptyDesc); err != nil {
-		return fmt.Errorf("binary writing empty descriptor: %s", err)
-	}
-
-	return nil
-}
-
-// AddObject add a new data object and its descriptor into the specified SIF file.
-func (fimg *FileImage) AddObject(input DescriptorInput) error {
-	// set file pointer to the end of data section
-	if _, err := fimg.Fp.Seek(fimg.Header.Dataoff+fimg.Header.Datalen, 0); err != nil {
-		return fmt.Errorf("setting file offset pointer to DataStartOffset: %s", err)
-	}
-
-	// create a new descriptor entry from input data
-	if err := createDescriptor(fimg, input); err != nil {
-		return err
-	}
-
-	// write down the descriptor array
-	if err := writeDescriptors(fimg); err != nil {
-		return err
-	}
-
-	fimg.Header.Mtime = time.Now().Unix()
-	// write down global header to file
-	if err := writeHeader(fimg); err != nil {
-		return err
-	}
-
-	if err := fimg.Fp.Sync(); err != nil {
-		return fmt.Errorf("while sync'ing new data object to SIF file: %s", err)
-	}
-
-	return nil
-}
-
-// descrIsLast return true if passed descriptor's object is the last in a SIF file
-func objectIsLast(fimg *FileImage, descr *Descriptor) bool {
-	return fimg.Filesize == descr.Fileoff+descr.Filelen
-}
-
-// compactAtDescr joins data objects leading and following "descr" by compacting a SIF file
-func compactAtDescr(fimg *FileImage, descr *Descriptor) error {
-	var prev Descriptor
-
-	for _, v := range fimg.DescrArr {
-		if !v.Used || v.ID == descr.ID {
-			continue
-		} else {
-			if v.Fileoff > prev.Fileoff {
-				prev = v
-			}
-		}
-	}
-	// make sure it's not the only used descriptor first
-	if prev.Used {
-		if err := fimg.Fp.Truncate(prev.Fileoff + prev.Filelen); err != nil {
-			return err
-		}
-	} else {
-		if err := fimg.Fp.Truncate(descr.Fileoff); err != nil {
-			return err
-		}
-	}
-	fimg.Header.Datalen -= descr.Storelen
-	return nil
-}
-
-// DeleteObject removes data from a SIF file referred to by id. The descriptor for the
-// data object is free'd and can be reused later. There's currenly 2 clean mode specified
-// by flags: DelZero, to zero out the data region for security and DelCompact to
-// remove and shink the file compacting the unused area.
-func (fimg *FileImage) DeleteObject(id uint32, flags int) error {
-	descr, index, err := fimg.GetFromDescrID(id)
-	if err != nil {
-		return err
-	}
-
-	switch flags {
-	case DelZero:
-		if err = zeroData(fimg, descr); err != nil {
-			return err
-		}
-	case DelCompact:
-		if objectIsLast(fimg, descr) {
-			if err = compactAtDescr(fimg, descr); err != nil {
-				return err
-			}
-		} else {
-			return fmt.Errorf("method (DelCompact) not implemented yet")
-		}
-	default:
-		if objectIsLast(fimg, descr) {
-			if err = compactAtDescr(fimg, descr); err != nil {
-				return err
-			}
-		}
-	}
-
-	// update some global header fields from deleting this descriptor
-	fimg.Header.Dfree++
-	fimg.Header.Mtime = time.Now().Unix()
-
-	// zero out the unused descriptor
-	if err = resetDescriptor(fimg, index); err != nil {
-		return err
-	}
-
-	// update global header
-	if err = writeHeader(fimg); err != nil {
-		return err
-	}
-
-	if err := fimg.Fp.Sync(); err != nil {
-		return fmt.Errorf("while sync'ing deleted data object to SIF file: %s", err)
-	}
-
-	return nil
-}
-
-// SetPartExtra serializes the partition and fs type info into a binary buffer
-func (di *DescriptorInput) SetPartExtra(fs Fstype, part Parttype, arch string) error {
-	extra := Partition{
-		Fstype:   fs,
-		Parttype: part,
-	}
-	if arch == HdrArchUnknown {
-		return fmt.Errorf("architecture not supported: %v", arch)
-	}
-	copy(extra.Arch[:], arch[:])
-
-	// serialize the partition data for integration with the base descriptor input
-	if err := binary.Write(&di.Extra, binary.LittleEndian, extra); err != nil {
-		return err
-	}
-	return nil
-}
-
-// SetSignExtra serializes the hash type and the entity info into a binary buffer
-func (di *DescriptorInput) SetSignExtra(hash Hashtype, entity string) error {
-	extra := Signature{
-		Hashtype: hash,
-	}
-
-	h, err := hex.DecodeString(entity)
-	if err != nil {
-		return err
-	}
-	copy(extra.Entity[:], h)
-
-	// serialize the signature data for integration with the base descriptor input
-	if err := binary.Write(&di.Extra, binary.LittleEndian, extra); err != nil {
-		return err
-	}
-	return nil
-}
-
-// SetName sets the byte array field "Name" to the value of string "name"
-func (d *Descriptor) SetName(name string) {
-	copy(d.Name[:], []byte(name))
-}
-
-// SetExtra sets the extra byte array to a provided byte array
-func (d *Descriptor) SetExtra(extra []byte) {
-	copy(d.Extra[:], extra)
-}
-
-// SetPrimPart sets the specified system partition to be the primary one
-func (fimg *FileImage) SetPrimPart(id uint32) error {
-	descr, _, err := fimg.GetFromDescrID(id)
-	if err != nil {
-		return err
-	}
-
-	if descr.Datatype != DataPartition {
-		return fmt.Errorf("not a volume partition")
-	}
-
-	ptype, err := descr.GetPartType()
-	if err != nil {
-		return err
-	}
-
-	// if already primary system partition, nothing to do
-	if ptype == PartPrimSys {
-		return nil
-	}
-
-	if ptype != PartSystem {
-		return fmt.Errorf("partition must be of system type")
-	}
-
-	olddescr, _, err := fimg.GetPartPrimSys()
-	if err != nil && err != ErrNotFound {
-		return err
-	}
-
-	fs, err := descr.GetFsType()
-	if err != nil {
-		return nil
-	}
-
-	arch, err := descr.GetArch()
-	if err != nil {
-		return err
-	}
-
-	copy(fimg.Header.Arch[:], arch[:])
-	fimg.PrimPartID = descr.ID
-
-	extra := Partition{
-		Fstype:   fs,
-		Parttype: PartPrimSys,
-	}
-	copy(extra.Arch[:], arch[:])
-
-	var extrabuf bytes.Buffer
-	if err := binary.Write(&extrabuf, binary.LittleEndian, extra); err != nil {
-		return err
-	}
-	descr.SetExtra(extrabuf.Bytes())
-
-	if olddescr != nil {
-		oldfs, err := olddescr.GetFsType()
-		if err != nil {
-			return nil
-		}
-		oldarch, err := olddescr.GetArch()
-		if err != nil {
-			return nil
-		}
-
-		oldextra := Partition{
-			Fstype:   oldfs,
-			Parttype: PartSystem,
-		}
-		copy(oldextra.Arch[:], oldarch[:])
-
-		var oldextrabuf bytes.Buffer
-		if err := binary.Write(&oldextrabuf, binary.LittleEndian, oldextra); err != nil {
-			return err
-		}
-		olddescr.SetExtra(oldextrabuf.Bytes())
-	}
-
-	// write down the descriptor array
-	if err := writeDescriptors(fimg); err != nil {
-		return err
-	}
-
-	fimg.Header.Mtime = time.Now().Unix()
-	// write down global header to file
-	if err := writeHeader(fimg); err != nil {
-		return err
-	}
-
-	if err := fimg.Fp.Sync(); err != nil {
-		return fmt.Errorf("while sync'ing new data object to SIF file: %s", err)
-	}
-
-	return nil
-}

sif/sif/init.go

@@ -1,23 +0,0 @@
-// Copyright (c) 2018, Sylabs Inc. All rights reserved.
-// Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
-// Copyright (c) 2017, Yannick Cote <yhcote@gmail.com> All rights reserved.
-// This software is licensed under a 3-clause BSD license. Please consult the
-// LICENSE file distributed with the sources of this project regarding your
-// rights to use or distribute this software.
-
-// +build linux
-
-package sif
-
-import (
-	"bytes"
-	"log"
-)
-
-var (
-	sifLoggerBuf bytes.Buffer
-	siflog       = log.New(&sifLoggerBuf, "", log.Ldate|log.Ltime|log.Lshortfile)
-)
-
-func init() {
-}

sif/sif/load.go

@@ -1,227 +0,0 @@
-// Copyright (c) 2018, Sylabs Inc. All rights reserved.
-// Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
-// Copyright (c) 2017, Yannick Cote <yhcote@gmail.com> All rights reserved.
-// This software is licensed under a 3-clause BSD license. Please consult the
-// LICENSE file distributed with the sources of this project regarding your
-// rights to use or distribute this software.
-
-// +build linux
-
-package sif
-
-import (
-	"bytes"
-	"encoding/binary"
-	"fmt"
-	"os"
-	"syscall"
-)
-
-// Read the global header from the container file
-func readHeader(fimg *FileImage) error {
-	if err := binary.Read(fimg.Reader, binary.LittleEndian, &fimg.Header); err != nil {
-		return fmt.Errorf("reading global header from container file: %s", err)
-	}
-
-	return nil
-}
-
-// Read the used descriptors and populate an in-memory representation of those in node list
-func readDescriptors(fimg *FileImage) error {
-	// start by positioning us to the start of descriptors
-	_, err := fimg.Reader.Seek(fimg.Header.Descroff, 0)
-	if err != nil {
-		return fmt.Errorf("seek() setting to descriptors start: %s", err)
-	}
-
-	// Initialize descriptor array (slice) and read them all from file
-	fimg.DescrArr = make([]Descriptor, fimg.Header.Dtotal)
-	if err := binary.Read(fimg.Reader, binary.LittleEndian, &fimg.DescrArr); err != nil {
-		fimg.DescrArr = nil
-		return fmt.Errorf("reading descriptor array from container file: %s", err)
-	}
-
-	descr, _, err := fimg.GetPartPrimSys()
-	if err == nil {
-		fimg.PrimPartID = descr.ID
-	}
-
-	return nil
-}
-
-// Look at key fields from the global header to assess SIF validity.
-// `runnable' checks is current container can run on host.
-func isValidSif(fimg *FileImage) error {
-	// check various header fields
-	if string(fimg.Header.Magic[:HdrMagicLen-1]) != HdrMagic {
-		return fmt.Errorf("invalid SIF file: Magic |%s| want |%s|", fimg.Header.Magic, HdrMagic)
-	}
-	if string(fimg.Header.Version[:HdrVersionLen-1]) > HdrVersion {
-		return fmt.Errorf("invalid SIF file: Version %s want <= %s", fimg.Header.Version, HdrVersion)
-	}
-
-	return nil
-}
-
-// mapFile takes a file pointer and returns a slice of bytes representing the file data
-func (fimg *FileImage) mapFile(rdonly bool) error {
-	prot := syscall.PROT_READ
-	flags := syscall.MAP_PRIVATE
-
-	info, err := fimg.Fp.Stat()
-	if err != nil {
-		return fmt.Errorf("while trying to size SIF file to mmap")
-	}
-	fimg.Filesize = info.Size()
-
-	size := nextAligned(info.Size(), syscall.Getpagesize())
-	if int64(int(size)) < info.Size() {
-		return fmt.Errorf("file is to big to be mapped")
-	}
-
-	if !rdonly {
-		prot = syscall.PROT_WRITE
-		flags = syscall.MAP_SHARED
-	}
-
-	fimg.Filedata, err = syscall.Mmap(int(fimg.Fp.Fd()), 0, int(size), prot, flags)
-	if err != nil {
-		// mmap failed, use sequential read() instead for top of file
-		siflog.Printf("mmap on %s failed, reading buffer sequentially...", fimg.Fp.Name())
-		fimg.Filedata = make([]byte, DataStartOffset)
-
-		// start by positioning us to the start of the file
-		_, err := fimg.Fp.Seek(0, 0)
-		if err != nil {
-			return fmt.Errorf("seek() setting to start of file: %s", err)
-		}
-
-		if n, err := fimg.Fp.Read(fimg.Filedata); n != DataStartOffset {
-			return fmt.Errorf("short read while reading top of file: %v", err)
-
-		}
-		fimg.Amodebuf = true
-	}
-
-	// create and associate a new bytes.Reader on top of mmap'ed or buffered data from file
-	fimg.Reader = bytes.NewReader(fimg.Filedata)
-
-	return nil
-}
-
-func (fimg *FileImage) unmapFile() error {
-	if fimg.Amodebuf {
-		return nil
-	}
-	if err := syscall.Munmap(fimg.Filedata); err != nil {
-		return fmt.Errorf("while calling unmapping SIF file")
-	}
-	return nil
-}
-
-// LoadContainer is responsible for loading a SIF container file. It takes
-// the container file name, and whether the file is opened as read-only
-// as arguments.
-func LoadContainer(filename string, rdonly bool) (fimg FileImage, err error) {
-	if rdonly { // open SIF rdonly if mounting immutable partitions or inspecting the image
-		if fimg.Fp, err = os.Open(filename); err != nil {
-			return fimg, fmt.Errorf("opening(RDONLY) container file: %s", err)
-		}
-	} else { // open SIF read-write when adding and removing data objects
-		if fimg.Fp, err = os.OpenFile(filename, os.O_RDWR, 0644); err != nil {
-			return fimg, fmt.Errorf("opening(RDWR) container file: %s", err)
-		}
-	}
-
-	// get a memory map of the SIF file
-	if err = fimg.mapFile(rdonly); err != nil {
-		return
-	}
-
-	// read global header from SIF file
-	if err = readHeader(&fimg); err != nil {
-		return
-	}
-
-	// validate global header
-	if err = isValidSif(&fimg); err != nil {
-		return
-	}
-
-	// read descriptor array from SIF file
-	if err = readDescriptors(&fimg); err != nil {
-		return
-	}
-
-	return
-}
-
-// LoadContainerFp is responsible for loading a SIF container file. It takes
-// a *os.File pointing to an opened file, and whether the file is opened as
-// read-only for arguments.
-func LoadContainerFp(fp *os.File, rdonly bool) (fimg FileImage, err error) {
-	if fp == nil {
-		return fimg, fmt.Errorf("provided fp for file is invalid")
-	}
-
-	fimg.Fp = fp
-
-	// get a memory map of the SIF file
-	if err = fimg.mapFile(rdonly); err != nil {
-		return
-	}
-
-	// read global header from SIF file
-	if err = readHeader(&fimg); err != nil {
-		return
-	}
-
-	// validate global header
-	if err = isValidSif(&fimg); err != nil {
-		return
-	}
-
-	// read descriptor array from SIF file
-	if err = readDescriptors(&fimg); err != nil {
-		return
-	}
-
-	return fimg, nil
-}
-
-// LoadContainerReader is responsible for processing SIF data from a byte stream
-// and extract various components like the global header, descriptors and even
-// perhaps data, depending on how much is read from the source.
-func LoadContainerReader(b *bytes.Reader) (fimg FileImage, err error) {
-	fimg.Reader = b
-
-	// read global header from SIF file
-	if err = readHeader(&fimg); err != nil {
-		return
-	}
-
-	// validate global header
-	if err = isValidSif(&fimg); err != nil {
-		return
-	}
-
-	// in the case where the reader buffer doesn't include descriptor data, we
-	// don't return an error and DescrArr will be set to nil
-	_ = readDescriptors(&fimg)
-
-	return fimg, nil
-}
-
-// UnloadContainer closes the SIF container file and free associated resources if needed
-func (fimg *FileImage) UnloadContainer() (err error) {
-	// if SIF data comes from file, not a slice buffer (see LoadContainer() variants)
-	if fimg.Fp != nil {
-		if err = fimg.unmapFile(); err != nil {
-			return
-		}
-		if err = fimg.Fp.Close(); err != nil {
-			return fmt.Errorf("closing SIF file failed, corrupted: don't use: %s", err)
-		}
-	}
-	return
-}

sif/sif/lookup.go

@@ -1,384 +0,0 @@
-// Copyright (c) 2018, Sylabs Inc. All rights reserved.
-// Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
-// Copyright (c) 2017, Yannick Cote <yhcote@gmail.com> All rights reserved.
-// This software is licensed under a 3-clause BSD license. Please consult the
-// LICENSE file distributed with the sources of this project regarding your
-// rights to use or distribute this software.
-
-// +build linux
-
-package sif
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"strings"
-)
-
-// ErrNotFound is the code for when no search key is not found
-var ErrNotFound = errors.New("no match found")
-
-// ErrMultValues is the code for when search key is not unique
-var ErrMultValues = errors.New("lookup would return more than one match")
-
-//
-// Methods on (fimg *FIleImage)
-//
-
-// GetSIFArch returns the SIF arch code from go runtime arch code
-func GetSIFArch(goarch string) (sifarch string) {
-	var ok bool
-
-	archMap := map[string]string{
-		"386":      HdrArch386,
-		"amd64":    HdrArchAMD64,
-		"arm":      HdrArchARM,
-		"arm64":    HdrArchARM64,
-		"ppc64":    HdrArchPPC64,
-		"ppc64le":  HdrArchPPC64le,
-		"mips":     HdrArchMIPS,
-		"mipsle":   HdrArchMIPSle,
-		"mips64":   HdrArchMIPS64,
-		"mips64le": HdrArchMIPS64le,
-		"s390x":    HdrArchS390x,
-	}
-
-	if sifarch, ok = archMap[goarch]; !ok {
-		sifarch = HdrArchUnknown
-	}
-	return sifarch
-}
-
-// GetGoArch returns the go runtime arch code from the SIF arch code
-func GetGoArch(sifarch string) (goarch string) {
-	var ok bool
-
-	archMap := map[string]string{
-		HdrArch386:      "386",
-		HdrArchAMD64:    "amd64",
-		HdrArchARM:      "arm",
-		HdrArchARM64:    "arm64",
-		HdrArchPPC64:    "ppc64",
-		HdrArchPPC64le:  "ppc64le",
-		HdrArchMIPS:     "mips",
-		HdrArchMIPSle:   "mipsle",
-		HdrArchMIPS64:   "mips64",
-		HdrArchMIPS64le: "mips64le",
-		HdrArchS390x:    "s390x",
-	}
-
-	if goarch, ok = archMap[sifarch]; !ok {
-		goarch = "unknown"
-	}
-	return goarch
-}
-
-// GetHeader returns the loaded SIF global header
-func (fimg *FileImage) GetHeader() *Header {
-	return &fimg.Header
-}
-
-// GetFromDescrID searches for a descriptor with
-func (fimg *FileImage) GetFromDescrID(id uint32) (*Descriptor, int, error) {
-	var match = -1
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if v.ID == id {
-				if match != -1 {
-					return nil, -1, ErrMultValues
-				}
-				match = i
-			}
-		}
-	}
-
-	if match == -1 {
-		return nil, -1, ErrNotFound
-	}
-
-	return &fimg.DescrArr[match], match, nil
-}
-
-// GetPartFromGroup searches for partition descriptors inside a specific group
-func (fimg *FileImage) GetPartFromGroup(groupid uint32) ([]*Descriptor, []int, error) {
-	var descrs []*Descriptor
-	var indexes []int
-	var count int
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if v.Datatype == DataPartition && v.Groupid == groupid {
-				indexes = append(indexes, i)
-				descrs = append(descrs, &fimg.DescrArr[i])
-				count++
-			}
-		}
-	}
-
-	if count == 0 {
-		return nil, nil, ErrNotFound
-	}
-
-	return descrs, indexes, nil
-}
-
-// GetSignFromGroup searches for signature descriptors inside a specific group
-func (fimg *FileImage) GetSignFromGroup(groupid uint32) ([]*Descriptor, []int, error) {
-	var descrs []*Descriptor
-	var indexes []int
-	var count int
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if v.Datatype == DataSignature && v.Groupid == groupid {
-				indexes = append(indexes, i)
-				descrs = append(descrs, &fimg.DescrArr[i])
-				count++
-			}
-		}
-	}
-
-	if count == 0 {
-		return nil, nil, ErrNotFound
-	}
-
-	return descrs, indexes, nil
-}
-
-// GetFromLinkedDescr searches for descriptors that point to "id"
-func (fimg *FileImage) GetFromLinkedDescr(ID uint32) ([]*Descriptor, []int, error) {
-	var descrs []*Descriptor
-	var indexes []int
-	var count int
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if v.Link == ID {
-				indexes = append(indexes, i)
-				descrs = append(descrs, &fimg.DescrArr[i])
-				count++
-			}
-		}
-	}
-
-	if count == 0 {
-		return nil, nil, ErrNotFound
-	}
-
-	return descrs, indexes, nil
-}
-
-// GetFromDescr searches for descriptors comparing all non-nil fields of a provided descriptor
-func (fimg *FileImage) GetFromDescr(descr Descriptor) ([]*Descriptor, []int, error) {
-	var descrs []*Descriptor
-	var indexes []int
-	var count int
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if descr.Datatype != 0 && descr.Datatype != v.Datatype {
-				continue
-			}
-			if descr.ID != 0 && descr.ID != v.ID {
-				continue
-			}
-			if descr.Groupid != 0 && descr.Groupid != v.Groupid {
-				continue
-			}
-			if descr.Link != 0 && descr.Link != v.Link {
-				continue
-			}
-			if descr.Fileoff != 0 && descr.Fileoff != v.Fileoff {
-				continue
-			}
-			if descr.Filelen != 0 && descr.Filelen != v.Filelen {
-				continue
-			}
-			if descr.Storelen != 0 && descr.Storelen != v.Storelen {
-				continue
-			}
-			if descr.Ctime != 0 && descr.Ctime != v.Ctime {
-				continue
-			}
-			if descr.Mtime != 0 && descr.Mtime != v.Mtime {
-				continue
-			}
-			if descr.UID != 0 && descr.UID != v.UID {
-				continue
-			}
-			if descr.Gid != 0 && descr.Gid != v.Gid {
-				continue
-			}
-			if descr.Name[0] != 0 && !bytes.Equal(descr.Name[:], v.Name[:]) {
-				continue
-			}
-
-			indexes = append(indexes, i)
-			descrs = append(descrs, &fimg.DescrArr[i])
-			count++
-		}
-	}
-
-	if count == 0 {
-		return nil, nil, ErrNotFound
-	}
-
-	return descrs, indexes, nil
-}
-
-//
-// Methods on (descr *Descriptor)
-//
-
-// GetData return a memory mapped byte slice mirroring the data object in a SIF file.
-func (descr *Descriptor) GetData(fimg *FileImage) []byte {
-	if fimg.Amodebuf {
-		_, err := fimg.Fp.Seek(descr.Fileoff, 0)
-		if err != nil {
-			return nil
-		}
-		data := make([]byte, descr.Filelen)
-		if n, _ := fimg.Fp.Read(data); int64(n) != descr.Filelen {
-			return nil
-		}
-		return data
-	}
-
-	return fimg.Filedata[descr.Fileoff : descr.Fileoff+descr.Filelen]
-}
-
-// GetName returns the name tag associated with the descriptor. Analogous to file name.
-func (descr *Descriptor) GetName() string {
-	return strings.TrimRight(string(descr.Name[:]), "\000")
-}
-
-// GetFsType extracts the Fstype field from the Extra field of a Partition Descriptor
-func (descr *Descriptor) GetFsType() (Fstype, error) {
-	if descr.Datatype != DataPartition {
-		return -1, fmt.Errorf("expected DataPartition, got %v", descr.Datatype)
-	}
-
-	var pinfo Partition
-	b := bytes.NewReader(descr.Extra[:])
-	if err := binary.Read(b, binary.LittleEndian, &pinfo); err != nil {
-		return -1, fmt.Errorf("while extracting Partition extra info: %s", err)
-	}
-
-	return pinfo.Fstype, nil
-}
-
-// GetPartType extracts the Parttype field from the Extra field of a Partition Descriptor
-func (descr *Descriptor) GetPartType() (Parttype, error) {
-	if descr.Datatype != DataPartition {
-		return -1, fmt.Errorf("expected DataPartition, got %v", descr.Datatype)
-	}
-
-	var pinfo Partition
-	b := bytes.NewReader(descr.Extra[:])
-	if err := binary.Read(b, binary.LittleEndian, &pinfo); err != nil {
-		return -1, fmt.Errorf("while extracting Partition extra info: %s", err)
-	}
-
-	return pinfo.Parttype, nil
-}
-
-// GetArch extracts the Arch field from the Extra field of a Partition Descriptor
-func (descr *Descriptor) GetArch() ([HdrArchLen]byte, error) {
-	if descr.Datatype != DataPartition {
-		return [HdrArchLen]byte{}, fmt.Errorf("expected DataPartition, got %v", descr.Datatype)
-	}
-
-	var pinfo Partition
-	b := bytes.NewReader(descr.Extra[:])
-	if err := binary.Read(b, binary.LittleEndian, &pinfo); err != nil {
-		return [HdrArchLen]byte{}, fmt.Errorf("while extracting Partition extra info: %s", err)
-	}
-
-	return pinfo.Arch, nil
-}
-
-// GetHashType extracts the Hashtype field from the Extra field of a Signature Descriptor
-func (descr *Descriptor) GetHashType() (Hashtype, error) {
-	if descr.Datatype != DataSignature {
-		return -1, fmt.Errorf("expected DataSignature, got %v", descr.Datatype)
-	}
-
-	var sinfo Signature
-	b := bytes.NewReader(descr.Extra[:])
-	if err := binary.Read(b, binary.LittleEndian, &sinfo); err != nil {
-		return -1, fmt.Errorf("while extracting Signature extra info: %s", err)
-	}
-
-	return sinfo.Hashtype, nil
-}
-
-// GetEntity extracts the signing entity field from the Extra field of a Signature Descriptor
-func (descr *Descriptor) GetEntity() ([]byte, error) {
-	if descr.Datatype != DataSignature {
-		return nil, fmt.Errorf("expected DataSignature, got %v", descr.Datatype)
-	}
-
-	var sinfo Signature
-	b := bytes.NewReader(descr.Extra[:])
-	if err := binary.Read(b, binary.LittleEndian, &sinfo); err != nil {
-		return nil, fmt.Errorf("while extracting Signature extra info: %s", err)
-	}
-
-	return sinfo.Entity[:], nil
-}
-
-// GetEntityString returns the string version of the stored entity
-func (descr *Descriptor) GetEntityString() (string, error) {
-	fingerprint, err := descr.GetEntity()
-	if err != nil {
-		return "", err
-	}
-
-	return fmt.Sprintf("%0X", fingerprint[:20]), nil
-}
-
-// GetPartPrimSys returns the primary system partition if present. There should
-// be only one primary system partition in a SIF file.
-func (fimg *FileImage) GetPartPrimSys() (*Descriptor, int, error) {
-	var descr *Descriptor
-	index := -1
-
-	for i, v := range fimg.DescrArr {
-		if !v.Used {
-			continue
-		} else {
-			if v.Datatype == DataPartition {
-				ptype, err := v.GetPartType()
-				if err != nil {
-					return nil, -1, err
-				}
-				if ptype == PartPrimSys {
-					if index != -1 {
-						return nil, -1, ErrMultValues
-					}
-					index = i
-					descr = &fimg.DescrArr[i]
-				}
-			}
-		}
-	}
-
-	if index == -1 {
-		return nil, -1, ErrNotFound
-	}
-
-	return descr, index, nil
-}

sif/sif/sif.go

@@ -1,297 +0,0 @@
-// Copyright (c) 2018, Sylabs Inc. All rights reserved.
-// Copyright (c) 2017, SingularityWare, LLC. All rights reserved.
-// Copyright (c) 2017, Yannick Cote <yhcote@gmail.com> All rights reserved.
-// This software is licensed under a 3-clause BSD license. Please consult the
-// LICENSE file distributed with the sources of this project regarding your
-// rights to use or distribute this software.
-
-// +build linux
-
-// Package sif implements data structures and routines to create
-// and access SIF files.
-// 	- sif.go contains the data definition the file format.
-//	- create.go implements the core functionality for the creation of
-//	  of new SIF files.
-//	- load.go implements the core functionality for the loading of
-//	  existing SIF files.
-//	- lookup.go mostly implements search/lookup and printing routines
-//	  and access to specific descriptor/data found in SIF container files.
-package sif
-
-import (
-	"bytes"
-	"os"
-
-	uuid "github.com/satori/go.uuid"
-)
-
-// Layout of a SIF file (example)
-//
-// .================================================.
-// | GLOBAL HEADER: Sifheader                       |
-// | - launch: "#!/usr/bin/env..."                  |
-// | - magic: "SIF_MAGIC"                           |
-// | - version: "1"                                 |
-// | - arch: "4"                                    |
-// | - uuid: b2659d4e-bd50-4ea5-bd17-eec5e54f918e   |
-// | - ctime: 1504657553                            |
-// | - mtime: 1504657653                            |
-// | - ndescr: 3                                    |
-// | - descroff: 120                                | --.
-// | - descrlen: 432                                |   |
-// | - dataoff: 4096                                |   |
-// | - datalen: 619362                              |   |
-// |------------------------------------------------| <-'
-// | DESCR[0]: Sifdeffile                           |
-// | - Sifcommon                                    |
-// |   - datatype: DATA_DEFFILE                     |
-// |   - id: 1                                      |
-// |   - groupid: 1                                 |
-// |   - link: NONE                                 |
-// |   - fileoff: 4096                              | --.
-// |   - filelen: 222                               |   |
-// |------------------------------------------------| <-----.
-// | DESCR[1]: Sifpartition                         |   |   |
-// | - Sifcommon                                    |   |   |
-// |   - datatype: DATA_PARTITION                   |   |   |
-// |   - id: 2                                      |   |   |
-// |   - groupid: 1                                 |   |   |
-// |   - link: NONE                                 |   |   |
-// |   - fileoff: 4318                              | ----. |
-// |   - filelen: 618496                            |   | | |
-// | - fstype: Squashfs                             |   | | |
-// | - parttype: System                             |   | | |
-// | - content: Linux                               |   | | |
-// |------------------------------------------------|   | | |
-// | DESCR[2]: Sifsignature                         |   | | |
-// | - Sifcommon                                    |   | | |
-// |   - datatype: DATA_SIGNATURE                   |   | | |
-// |   - id: 3                                      |   | | |
-// |   - groupid: NONE                              |   | | |
-// |   - link: 2                                    | ------'
-// |   - fileoff: 622814                            | ------.
-// |   - filelen: 644                               |   | | |
-// | - hashtype: SHA384                             |   | | |
-// | - entity: @                                    |   | | |
-// |------------------------------------------------| <-' | |
-// | Definition file data                           |     | |
-// | .                                              |     | |
-// | .                                              |     | |
-// | .                                              |     | |
-// |------------------------------------------------| <---' |
-// | File system partition image                    |       |
-// | .                                              |       |
-// | .                                              |       |
-// | .                                              |       |
-// |------------------------------------------------| <-----'
-// | Signed verification data                       |
-// | .                                              |
-// | .                                              |
-// | .                                              |
-// `================================================'
-
-// SIF header constants and quantities
-const (
-	HdrLaunch       = "#!/usr/bin/env run-singularity\n"
-	HdrMagic        = "SIF_MAGIC" // SIF identification
-	HdrVersion      = "02"        // SIF SPEC VERSION
-	HdrArchUnknown  = "00"        // Undefined/Unsupported arch
-	HdrArch386      = "01"        // 386 (i[3-6]86) arch code
-	HdrArchAMD64    = "02"        // AMD64 arch code
-	HdrArchARM      = "03"        // ARM arch code
-	HdrArchARM64    = "04"        // AARCH64 arch code
-	HdrArchPPC64    = "05"        // PowerPC 64 arch code
-	HdrArchPPC64le  = "06"        // PowerPC 64 little-endian arch code
-	HdrArchMIPS     = "07"        // MIPS arch code
-	HdrArchMIPSle   = "08"        // MIPS little-endian arch code
-	HdrArchMIPS64   = "09"        // MIPS64 arch code
-	HdrArchMIPS64le = "10"        // MIPS64 little-endian arch code
-	HdrArchS390x    = "11"        // IBM s390x arch code
-
-	HdrLaunchLen  = 32 // len("#!/usr/bin/env... ")
-	HdrMagicLen   = 10 // len("SIF_MAGIC")
-	HdrVersionLen = 3  // len("99")
-	HdrArchLen    = 3  // len("99")
-
-	DescrNumEntries   = 48                 // the default total number of available descriptors
-	DescrGroupMask    = 0xf0000000         // groups start at that offset
-	DescrUnusedGroup  = DescrGroupMask     // descriptor without a group
-	DescrDefaultGroup = DescrGroupMask | 1 // first groupid number created
-	DescrUnusedLink   = 0                  // descriptor without link to other
-	DescrEntityLen    = 256                // len("Joe Bloe <jbloe@gmail.com>...")
-	DescrNameLen      = 128                // descriptor name (string identifier)
-	DescrMaxPrivLen   = 384                // size reserved for descriptor specific data
-	DescrStartOffset  = 4096               // where descriptors start after global header
-	DataStartOffset   = 32768              // where data object start after descriptors
-)
-
-// Datatype represents the different SIF data object types stored in the image
-type Datatype int32
-
-// List of supported SIF data types
-const (
-	DataDeffile     Datatype = iota + 0x4001 // definition file data object
-	DataEnvVar                               // environment variables data object
-	DataLabels                               // JSON labels data object
-	DataPartition                            // file system data object
-	DataSignature                            // signing/verification data object
-	DataGenericJSON                          // generic JSON meta-data
-	DataGeneric                              // generic / raw data
-)
-
-// Fstype represents the different SIF file system types found in partition data objects
-type Fstype int32
-
-// List of supported file systems
-const (
-	FsSquash  Fstype = iota + 1 // Squashfs file system, RDONLY
-	FsExt3                      // EXT3 file system, RDWR (deprecated)
-	FsImmuObj                   // immutable data object archive
-	FsRaw                       // raw data
-)
-
-// Parttype represents the different SIF container partition types (system and data)
-type Parttype int32
-
-// List of supported partition types
-const (
-	PartSystem  Parttype = iota + 1 // partition hosts an operating system
-	PartPrimSys                     // partition hosts the primary operating system
-	PartData                        // partition hosts data only
-	PartOverlay                     // partition hosts an overlay
-)
-
-// Hashtype represents the different SIF hashing function types used to fingerprint data objects
-type Hashtype int32
-
-// List of supported hash functions
-const (
-	HashSHA256 Hashtype = iota + 1
-	HashSHA384
-	HashSHA512
-	HashBLAKE2S
-	HashBLAKE2B
-)
-
-// SIF data object deletation strategies
-const (
-	DelZero    = iota + 1 // zero the data object bytes
-	DelCompact            // free the space used by data object
-)
-
-// Descriptor represents the SIF descriptor type
-type Descriptor struct {
-	Datatype Datatype // informs of descriptor type
-	Used     bool     // is the descriptor in use
-	ID       uint32   // a unique id for this data object
-	Groupid  uint32   // object group this data object is related to
-	Link     uint32   // special link or relation to an id or group
-	Fileoff  int64    // offset from start of image file
-	Filelen  int64    // length of data in file
-	Storelen int64    // length of data + alignment to store data in file
-
-	Ctime int64                 // image creation time
-	Mtime int64                 // last modification time
-	UID   int64                 // system user owning the file
-	Gid   int64                 // system group owning the file
-	Name  [DescrNameLen]byte    // descriptor name (string identifier)
-	Extra [DescrMaxPrivLen]byte // big enough for extra data below
-}
-
-// Deffile represents the SIF definition-file data object descriptor
-type Deffile struct {
-}
-
-// Labels represents the SIF JSON-labels data object descriptor
-type Labels struct {
-}
-
-// Envvar represents the SIF envvar data object descriptor
-type Envvar struct {
-}
-
-// Partition represents the SIF partition data object descriptor
-type Partition struct {
-	Fstype   Fstype
-	Parttype Parttype
-	Arch     [HdrArchLen]byte // arch the image is built for
-}
-
-// Signature represents the SIF signature data object descriptor
-type Signature struct {
-	Hashtype Hashtype
-	Entity   [DescrEntityLen]byte
-}
-
-// GenericJSON represents the SIF generic JSON meta-data data object descriptor
-type GenericJSON struct {
-}
-
-// Generic represents the SIF generic data object descriptor
-type Generic struct {
-}
-
-// Header describes a loaded SIF file
-type Header struct {
-	Launch [HdrLaunchLen]byte // #! shell execution line
-
-	Magic   [HdrMagicLen]byte   // look for "SIF_MAGIC"
-	Version [HdrVersionLen]byte // SIF version
-	Arch    [HdrArchLen]byte    // arch the primary partition is built for
-	ID      uuid.UUID           // image unique identifier
-
-	Ctime int64 // image creation time
-	Mtime int64 // last modification time
-
-	Dfree    int64 // # of unused data object descr.
-	Dtotal   int64 // # of total available data object descr.
-	Descroff int64 // bytes into file where descs start
-	Descrlen int64 // bytes used by all current descriptors
-	Dataoff  int64 // bytes into file where data starts
-	Datalen  int64 // bytes used by all data objects
-}
-
-//
-// This section describes SIF creation/loading data structures used when
-// building or opening a SIF file. Transient data not found in the final
-// SIF file. Those data structures are internal.
-//
-
-// FileImage describes the representation of a SIF file in memory
-type FileImage struct {
-	Header     Header        // the loaded SIF global header
-	Fp         *os.File      // file pointer of opened SIF file
-	Filesize   int64         // file size of the opened SIF file
-	Filedata   []byte        // the content of the opened file
-	Amodebuf   bool          // access mode: mmap = false, buffered = true
-	Reader     *bytes.Reader // reader on top of Mapdata
-	DescrArr   []Descriptor  // slice of loaded descriptors from SIF file
-	PrimPartID uint32        // ID of primary system partition if present
-}
-
-// CreateInfo wraps all SIF file creation info needed
-type CreateInfo struct {
-	Pathname   string            // the end result output filename
-	Launchstr  string            // the shell run command
-	Sifversion string            // the SIF specification version used
-	ID         uuid.UUID         // image unique identifier
-	InputDescr []DescriptorInput // slice of input info for descriptor creation
-}
-
-// DescriptorInput describes the common info needed to create a data object descriptor
-type DescriptorInput struct {
-	Datatype  Datatype // datatype being harvested for new descriptor
-	Groupid   uint32   // group to be set for new descriptor
-	Link      uint32   // link to be set for new descriptor
-	Size      int64    // size of the data object for the new descriptor
-	Alignment int      // Align requirement for data object
-
-	Fname string   // file containing data associated with the new descriptor
-	Fp    *os.File // file pointer to opened 'fname'
-	Data  []byte   // loaded data from file
-
-	Image *FileImage  // loaded SIF file in memory
-	Descr *Descriptor // created end result descriptor
-
-	Extra bytes.Buffer // where specific input type store their data
-}