build: Improve fuzz tests' reliability
Establish conventions which aligns with what is supported upstream today, whilst expanding on documentation to ensure folks have pointers on how to debug/check for issues going forwards. Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>
This commit is contained in:
Paulo Gomes
parent
43b99c65b6
commit
5fefee34b7
4
Makefile
4
Makefile
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@ -276,9 +276,9 @@ ifneq ($(shell grep -o 'LIBGIT2_IMG ?= \w.*' Makefile | cut -d ' ' -f 3):$(shell
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exit 1; \
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}
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endif
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ifneq ($(shell grep -o 'LIBGIT2_TAG ?= \w.*' Makefile | cut -d ' ' -f 3), $(shell grep -o "LIBGIT2_TAG=.*" tests/fuzz/oss_fuzz_build.sh | sed 's;LIBGIT2_TAG="$${LIBGIT2_TAG:-;;g' | sed 's;}";;g'))
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ifneq ($(shell grep -o 'LIBGIT2_TAG ?= \w.*' Makefile | cut -d ' ' -f 3), $(shell grep -o "LIBGIT2_TAG=.*" tests/fuzz/oss_fuzz_prebuild.sh | sed 's;LIBGIT2_TAG="$${LIBGIT2_TAG:-;;g' | sed 's;}";;g'))
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@{ \
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echo "LIBGIT2_TAG must match in both Makefile and tests/fuzz/oss_fuzz_build.sh"; \
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echo "LIBGIT2_TAG must match in both Makefile and tests/fuzz/oss_fuzz_prebuild.sh"; \
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exit 1; \
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}
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endif
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@ -1,5 +1,5 @@
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//go:build gofuzz
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// +build gofuzz
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//go:build gofuzz_libfuzzer
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// +build gofuzz_libfuzzer
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/*
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Copyright 2021 The Flux authors
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@ -32,7 +32,6 @@ import (
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"time"
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fuzz "github.com/AdaLogics/go-fuzz-headers"
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"github.com/fluxcd/image-automation-controller/controllers"
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"github.com/fluxcd/image-automation-controller/pkg/update"
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"github.com/fluxcd/pkg/gittestserver"
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"github.com/fluxcd/pkg/runtime/testenv"
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@ -1,3 +1,19 @@
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/*
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Copyright 2022 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controllers
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import (
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@ -0,0 +1,82 @@
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# fuzz testing
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Flux is part of Google's [oss fuzz] program which provides continuous fuzzing for
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open source projects.
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The long running fuzzing execution is configured in the [oss-fuzz repository].
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Shorter executions are done on a per-PR basis, configured as a [github workflow].
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### Testing locally
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Build fuzzers:
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```bash
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make fuzz-build
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```
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All fuzzers will be built into `./build/fuzz/out`.
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Smoke test fuzzers:
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All the fuzzers will be built and executed once, to ensure they are fully functional.
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```bash
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make fuzz-smoketest
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```
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Run fuzzer locally:
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```bash
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./build/fuzz/out/fuzz_conditions_match
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```
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Run fuzzer inside a container:
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```bash
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docker run --rm -ti \
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-v "$(pwd)/build/fuzz/out":/out \
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gcr.io/oss-fuzz/fluxcd \
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/out/fuzz_conditions_match
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```
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### Caveats of creating oss-fuzz compatible tests
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#### Segregate fuzz tests
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OSS-Fuzz does not properly support mixed `*_test.go` files, in which there is a combination
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of fuzz and non-fuzz tests. To mitigate this problem, ensure your fuzz tests are not in the
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same file as other Go tests. As a pattern, call your fuzz test files `*_fuzz_test.go`.
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#### Build tags to avoid conflicts when running Go tests
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Due to the issue above, code duplication will occur when creating fuzz tests that rely on
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helper functions that are shared with other tests. To avoid build issues, add a conditional
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build tag at the top of the `*_fuzz_test.go` file:
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```go
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//go:build gofuzz_libfuzzer
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// +build gofuzz_libfuzzer
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```
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The build tag above is set at [go-118-fuzz-build].
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At this point in time we can't pass on specific tags from [compile_native_go_fuzzer].
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### Running oss-fuzz locally
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The `make fuzz-smoketest` is meant to be an easy way to reproduce errors that may occur
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upstream. If our checks ever run out of sync with upstream, the upstream tests can be
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executed locally with:
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```
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git clone --depth 1 https://github.com/google/oss-fuzz
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cd oss-fuzz
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python infra/helper.py build_image fluxcd
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python infra/helper.py build_fuzzers --sanitizer address --architecture x86_64 fluxcd
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python infra/helper.py check_build --sanitizer address --architecture x86_64 fluxcd
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```
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For latest info on testing oss-fuzz locally, refer to the [upstream guide].
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[oss fuzz]: https://github.com/google/oss-fuzz
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[oss-fuzz repository]: https://github.com/google/oss-fuzz/tree/master/projects/fluxcd
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[github workflow]: .github/workflows/cifuzz.yaml
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[upstream guide]: https://google.github.io/oss-fuzz/getting-started/new-project-guide/#testing-locally
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[go-118-fuzz-build]: https://github.com/AdamKorcz/go-118-fuzz-build/blob/b2031950a318d4f2dcf3ec3e128f904d5cf84623/main.go#L40
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[compile_native_go_fuzzer]: https://github.com/google/oss-fuzz/blob/c2d827cb78529fdc757c9b0b4fea0f1238a54814/infra/base-images/base-builder/compile_native_go_fuzzer#L32
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@ -18,27 +18,7 @@
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# This is a copy of the upstream script which is only needed to link
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# additional static libraries. Orignal source:
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#
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# https://github.com/google/oss-fuzz/blob/81326f0a39eadebfa9b7a98aa9f0553707875696/infra/base-images/base-builder/compile_go_fuzzer
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# Rewrites a copy of the fuzzer to allow for
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# libFuzzer instrumentation.
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function rewrite_go_fuzz_harness() {
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fuzzer_filename=$1
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fuzz_function=$2
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# Create a copy of the fuzzer to not modify the existing fuzzer.
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cp $fuzzer_filename "${fuzzer_filename}"_fuzz_.go
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mv $fuzzer_filename /tmp/
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fuzzer_fn="${fuzzer_filename}"_fuzz_.go
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# Replace *testing.F with *go118fuzzbuildutils.F.
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echo "replacing *testing.F"
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sed -i "s/func $fuzz_function(\([a-zA-Z0-9]*\) \*testing\.F)/func $fuzz_function(\1 \*go118fuzzbuildutils\.F)/g" "${fuzzer_fn}"
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# Import https://github.com/AdamKorcz/go-118-fuzz-build.
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# This changes the line numbers from the original fuzzer.
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addimport -path "${fuzzer_fn}"
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}
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# https://github.com/google/oss-fuzz/blob/9e8dd47cb902545efc60a5580126adc36d70bae3/infra/base-images/base-builder/compile_native_go_fuzzer
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function build_native_go_fuzzer() {
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fuzzer=$1
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@ -46,28 +26,16 @@ function build_native_go_fuzzer() {
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path=$3
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tags="-tags gofuzz"
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if [[ $SANITIZER = *coverage* ]]; then
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echo "here we perform coverage build"
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fuzzed_package=`go list $tags -f '{{.Name}}' $path`
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abspath=`go list $tags -f {{.Dir}} $path`
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cd $abspath
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cp $GOPATH/native_ossfuzz_coverage_runner.go ./"${function,,}"_test.go
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sed -i -e 's/FuzzFunction/'$function'/' ./"${function,,}"_test.go
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sed -i -e 's/mypackagebeingfuzzed/'$fuzzed_package'/' ./"${function,,}"_test.go
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sed -i -e 's/TestFuzzCorpus/Test'$function'Corpus/' ./"${function,,}"_test.go
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# The repo is the module path/name, which is already created above
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# in case it doesn't exist, but not always the same as the module
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# path. This is necessary to handle SIV properly.
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fuzzed_repo=$(go list $tags -f {{.Module}} "$path")
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abspath_repo=`go list -m $tags -f {{.Dir}} $fuzzed_repo || go list $tags -f {{.Dir}} $fuzzed_repo`
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# give equivalence to absolute paths in another file, as go test -cover uses golangish pkg.Dir
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echo "s=$fuzzed_repo"="$abspath_repo"= > $OUT/$fuzzer.gocovpath
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go test -run Test${function}Corpus -v $tags -coverpkg $fuzzed_repo/... -c -o $OUT/$fuzzer $path
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rm ./"${function,,}"_test.go
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if [[ $SANITIZER == *coverage* ]]; then
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current_dir=$(pwd)
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mkdir $OUT/rawfuzzers || true
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cd $abs_file_dir
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go test -c -run $fuzzer -o $OUT/$fuzzer -cover
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cp "${fuzzer_filename}" "${OUT}/rawfuzzers/${fuzzer}"
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cd $current_dir
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else
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go-118-fuzz-build -o $fuzzer.a -func $function $abs_file_dir
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# TODO: upstream support for linking $ADDITIONAL_LIBS
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$CXX $CXXFLAGS $LIB_FUZZING_ENGINE $fuzzer.a -o $OUT/$fuzzer \
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$ADDITIONAL_LIBS
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fi
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@ -88,13 +56,7 @@ fuzzer_filename=$(grep -r -l --include='*.go' -s "$function" "${abs_file_dir}")
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# Test if file contains a line with "func $function" and "testing.F".
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if [ $(grep -r "func $function" $fuzzer_filename | grep "testing.F" | wc -l) -eq 1 ]
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then
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rewrite_go_fuzz_harness $fuzzer_filename $function
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build_native_go_fuzzer $fuzzer $function $abs_file_dir
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# Clean up.
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rm "${fuzzer_filename}_fuzz_.go"
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mv /tmp/$(basename $fuzzer_filename) $fuzzer_filename
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else
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echo "Could not find the function: func ${function}(f *testing.F)"
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fi
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@ -16,118 +16,65 @@
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set -euxo pipefail
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LIBGIT2_TAG="${LIBGIT2_TAG:-v0.4.0}"
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# This file aims for:
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# - Dynamically discover and build all fuzz tests within the repository.
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# - Work for both local make fuzz-smoketest and the upstream oss-fuzz.
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GOPATH="${GOPATH:-/root/go}"
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GO_SRC="${GOPATH}/src"
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PROJECT_PATH="github.com/fluxcd/image-automation-controller"
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TMP_DIR=$(mktemp -d /tmp/oss_fuzz-XXXXXX)
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cleanup(){
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rm -rf "${TMP_DIR}"
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}
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trap cleanup EXIT
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# install_deps installs all dependencies needed for upstream oss-fuzz.
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# Unfortunately we can't pin versions here, as we want to always
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# have the latest, so that we can reproduce errors occuring upstream.
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install_deps(){
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if ! command -v go-118-fuzz-build &> /dev/null || ! command -v addimport &> /dev/null; then
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mkdir -p "${TMP_DIR}/go-118-fuzz-build"
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git clone https://github.com/AdamKorcz/go-118-fuzz-build "${TMP_DIR}/go-118-fuzz-build"
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cd "${TMP_DIR}/go-118-fuzz-build"
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go build -o "${GOPATH}/bin/go-118-fuzz-build"
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cd addimport
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go build -o "${GOPATH}/bin/addimport"
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if ! command -v go-118-fuzz-build &> /dev/null; then
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go install github.com/AdamKorcz/go-118-fuzz-build@latest
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fi
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if ! command -v goimports &> /dev/null; then
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go install golang.org/x/tools/cmd/goimports@latest
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fi
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}
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# Removes the content of test funcs which could cause the Fuzz
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# tests to break.
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remove_test_funcs(){
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filename=$1
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echo "removing co-located *testing.T"
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sed -i -e '/func Test.*testing.T) {$/ {:r;/\n}/!{N;br}; s/\n.*\n/\n/}' "${filename}"
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# Remove gomega reference as it is not used by Fuzz tests.
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sed -i 's;. "github.com/onsi/gomega";;g' "${filename}"
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# After removing the body of the go testing funcs, consolidate the imports.
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goimports -w "${filename}"
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}
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install_deps
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cd "${GO_SRC}/${PROJECT_PATH}"
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export TARGET_DIR="$(/bin/pwd)/build/libgit2/${LIBGIT2_TAG}"
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# For most cases, libgit2 will already be present.
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# The exception being at the oss-fuzz integration.
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if [ ! -d "${TARGET_DIR}" ]; then
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curl -o output.tar.gz -LO "https://github.com/fluxcd/golang-with-libgit2/releases/download/${LIBGIT2_TAG}/linux-$(uname -m)-libgit2-only.tar.gz"
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DIR=linux-libgit2-only
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NEW_DIR="$(/bin/pwd)/build/libgit2/${LIBGIT2_TAG}"
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INSTALLED_DIR="/home/runner/work/golang-with-libgit2/golang-with-libgit2/build/${DIR}"
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mkdir -p ./build/libgit2
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tar -xf output.tar.gz
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rm output.tar.gz
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mv "${DIR}" "${LIBGIT2_TAG}"
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mv "${LIBGIT2_TAG}/" "./build/libgit2"
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# Update the prefix paths included in the .pc files.
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# This will make it easier to update to the location in which they will be used.
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find "${NEW_DIR}" -type f -name "*.pc" | xargs -I {} sed -i "s;${INSTALLED_DIR};${NEW_DIR};g" {}
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# Ensure any project-specific requirements are catered for ahead of
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# the generic build process.
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if [ -f "tests/fuzz/oss_fuzz_prebuild.sh" ]; then
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. tests/fuzz/oss_fuzz_prebuild.sh
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fi
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go get github.com/AdamKorcz/go-118-fuzz-build/utils
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modules=$(find . -mindepth 1 -maxdepth 4 -type f -name 'go.mod' | cut -c 3- | sed 's|/[^/]*$$||' | sort -u | sed 's;/go.mod;;g' | sed 's;go.mod;.;g')
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# Setup files to be embedded into controllers_fuzzer.go's testFiles variable.
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mkdir -p controllers/testdata/crd
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cp config/crd/bases/*.yaml controllers/testdata/crd
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for module in ${modules}; do
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export CGO_ENABLED=1
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export LIBRARY_PATH="${TARGET_DIR}/lib"
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export PKG_CONFIG_PATH="${TARGET_DIR}/lib/pkgconfig"
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export CGO_CFLAGS="-I${TARGET_DIR}/include"
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export CGO_LDFLAGS="$(pkg-config --libs --static --cflags libgit2)"
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cd "${GO_SRC}/${PROJECT_PATH}/${module}"
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# Version of the source-controller from which to get the GitRepository CRD.
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# Pulls source-controller/api's version set in go.mod.
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SOURCE_VER=$(go list -m github.com/fluxcd/source-controller/api | awk '{print $2}')
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test_files=$(grep -r --include='**_test.go' --files-with-matches 'func Fuzz' . || echo "")
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if [ -z "${test_files}" ]; then
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continue
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fi
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# Version of the image-reflector-controller from which to get the ImagePolicy CRD.
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# Pulls image-reflector-controller/api's version set in go.mod.
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REFLECTOR_VER=$(go list -m github.com/fluxcd/image-reflector-controller/api | awk '{print $2}')
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go get github.com/AdamKorcz/go-118-fuzz-build/testing
|
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|
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if [ -d "../../controllers/testdata/crds" ]; then
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cp ../../controllers/testdata/crds/*.yaml testdata/crds
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else
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# Fetch the CRDs if not present since we need them when running fuzz tests on CI.
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curl -s --fail https://raw.githubusercontent.com/fluxcd/source-controller/${SOURCE_VER}/config/crd/bases/source.toolkit.fluxcd.io_gitrepositories.yaml -o controllers/testdata/crd/gitrepositories.yaml
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curl -s --fail https://raw.githubusercontent.com/fluxcd/image-reflector-controller/${REFLECTOR_VER}/config/crd/bases/image.toolkit.fluxcd.io_imagepolicies.yaml -o controllers/testdata/crd/imagepolicies.yaml
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fi
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# Iterate through all Go Fuzz targets, compiling each into a fuzzer.
|
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for file in ${test_files}; do
|
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# If the subdir is a module, skip this file, as it will be handled
|
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# at the next iteration of the outer loop.
|
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if [ -f "$(dirname "${file}")/go.mod" ]; then
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continue
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fi
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|
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export ADDITIONAL_LIBS="${TARGET_DIR}/lib/libgit2.a"
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targets=$(grep -oP 'func \K(Fuzz\w*)' "${file}")
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for target_name in ${targets}; do
|
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# Transform module path into module name (e.g. git/libgit2 to git_libgit2).
|
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module_name=$(echo ${module} | tr / _)
|
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# Compose fuzzer name based on the lowercase version of the func names.
|
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# The module name is added after the fuzz prefix, for better discoverability.
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fuzzer_name=$(echo "${target_name}" | tr '[:upper:]' '[:lower:]' | sed "s;fuzz_;fuzz_${module_name}_;g")
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target_dir=$(dirname "${file}")
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|
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# Iterate through all Go Fuzz targets, compiling each into a fuzzer.
|
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test_files=$(grep -r --include='**_test.go' --files-with-matches 'func Fuzz' .)
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for file in ${test_files}
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do
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remove_test_funcs "${file}"
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||||
|
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targets=$(grep -oP 'func \K(Fuzz\w*)' "${file}")
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||||
for target_name in ${targets}
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do
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fuzzer_name=$(echo "${target_name}" | tr '[:upper:]' '[:lower:]')
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target_dir=$(dirname "${file}")
|
||||
|
||||
echo "Building ${file}.${target_name} into ${fuzzer_name}"
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compile_native_go_fuzzer "${target_dir}" "${target_name}" "${fuzzer_name}"
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echo "Building ${file}.${target_name} into ${fuzzer_name}"
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compile_native_go_fuzzer "${target_dir}" "${target_name}" "${fuzzer_name}"
|
||||
done
|
||||
done
|
||||
done
|
||||
|
|
|
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|
|
@ -0,0 +1,73 @@
|
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#!/usr/bin/env bash
|
||||
|
||||
# Copyright 2022 The Flux authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
set -euxo pipefail
|
||||
|
||||
# This file is executed by upstream oss-fuzz for any requirements that
|
||||
# are specific for building this project.
|
||||
|
||||
# Some tests requires embedded resources. Embedding does not allow
|
||||
# for traversing into ascending dirs, therefore we copy those contents here:
|
||||
mkdir -p controllers/testdata/crd
|
||||
cp config/crd/bases/*.yaml controllers/testdata/crd
|
||||
|
||||
LIBGIT2_TAG="${LIBGIT2_TAG:-v0.4.0}"
|
||||
|
||||
export TARGET_DIR="$(/bin/pwd)/build/libgit2/${LIBGIT2_TAG}"
|
||||
export CGO_ENABLED=1
|
||||
export LIBRARY_PATH="${TARGET_DIR}/lib"
|
||||
export PKG_CONFIG_PATH="${TARGET_DIR}/lib/pkgconfig"
|
||||
export CGO_CFLAGS="-I${TARGET_DIR}/include"
|
||||
export CGO_LDFLAGS="$(pkg-config --libs --static --cflags libgit2)"
|
||||
|
||||
# For most cases, libgit2 will already be present.
|
||||
# The exception being at the oss-fuzz integration.
|
||||
if [ ! -d "${TARGET_DIR}" ]; then
|
||||
curl -o output.tar.gz -LO "https://github.com/fluxcd/golang-with-libgit2/releases/download/${LIBGIT2_TAG}/linux-$(uname -m)-libgit2-only.tar.gz"
|
||||
|
||||
DIR=linux-libgit2-only
|
||||
NEW_DIR="$(/bin/pwd)/build/libgit2/${LIBGIT2_TAG}"
|
||||
INSTALLED_DIR="/home/runner/work/golang-with-libgit2/golang-with-libgit2/build/${DIR}"
|
||||
|
||||
mkdir -p ./build/libgit2
|
||||
|
||||
tar -xf output.tar.gz
|
||||
rm output.tar.gz
|
||||
mv "${DIR}" "${LIBGIT2_TAG}"
|
||||
mv "${LIBGIT2_TAG}/" "./build/libgit2"
|
||||
|
||||
# Update the prefix paths included in the .pc files.
|
||||
# This will make it easier to update to the location in which they will be used.
|
||||
find "${NEW_DIR}" -type f -name "*.pc" | xargs -I {} sed -i "s;${INSTALLED_DIR};${NEW_DIR};g" {}
|
||||
fi
|
||||
|
||||
# Version of the source-controller from which to get the GitRepository CRD.
|
||||
# Pulls source-controller/api's version set in go.mod.
|
||||
SOURCE_VER=$(go list -m github.com/fluxcd/source-controller/api | awk '{print $2}')
|
||||
|
||||
# Version of the image-reflector-controller from which to get the ImagePolicy CRD.
|
||||
# Pulls image-reflector-controller/api's version set in go.mod.
|
||||
REFLECTOR_VER=$(go list -m github.com/fluxcd/image-reflector-controller/api | awk '{print $2}')
|
||||
|
||||
if [ -d "../../controllers/testdata/crds" ]; then
|
||||
cp ../../controllers/testdata/crds/*.yaml testdata/crds
|
||||
else
|
||||
# Fetch the CRDs if not present since we need them when running fuzz tests on CI.
|
||||
curl -s --fail https://raw.githubusercontent.com/fluxcd/source-controller/${SOURCE_VER}/config/crd/bases/source.toolkit.fluxcd.io_gitrepositories.yaml -o controllers/testdata/crd/gitrepositories.yaml
|
||||
curl -s --fail https://raw.githubusercontent.com/fluxcd/image-reflector-controller/${REFLECTOR_VER}/config/crd/bases/image.toolkit.fluxcd.io_imagepolicies.yaml -o controllers/testdata/crd/imagepolicies.yaml
|
||||
fi
|
||||
|
||||
export ADDITIONAL_LIBS="${TARGET_DIR}/lib/libgit2.a"
|
||||
Loading…
Reference in New Issue