Add systempaths=unconfined option

Add the systempaths=unconfined option to --security-opt
to match the docker options for unmasking all the paths
that are masked by default.
Add the mask and unmask options to the podman create doc.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

cmd/podman/common/specgen.go

@@ -531,6 +531,13 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 			case "seccomp":
 				s.SeccompProfilePath = con[1]
 				s.Annotations[define.InspectAnnotationSeccomp] = con[1]
+			// this option is for docker compatibility, it is the same as unmask=ALL
+			case "systempaths":
+				if con[1] == "unconfined" {
+					s.ContainerSecurityConfig.Unmask = append(s.ContainerSecurityConfig.Unmask, []string{"ALL"}...)
+				} else {
+					return fmt.Errorf("invalid systempaths option %q, only `unconfined` is supported", con[1])
+				}
 			case "unmask":
 				s.ContainerSecurityConfig.Unmask = append(s.ContainerSecurityConfig.Unmask, strings.Split(con[1], ":")...)
 			default:

docs/source/markdown/podman-create.1.md

@@ -845,11 +845,18 @@ Security Options
 - `label=filetype:TYPE` : Set the label file type for the container files
 - `label=disable`       : Turn off label separation for the container
 
+- `mask=/path/1:/path/2` : The paths to mask separated by a colon. A masked path
+  cannot be accessed inside the container.
+
 - `no-new-privileges` : Disable container processes from gaining additional privileges
 
 - `seccomp=unconfined` : Turn off seccomp confinement for the container
 - `seccomp=profile.json` :  White listed syscalls seccomp Json file to be used as a seccomp filter
 
+- `unmask=ALL or /path/1:/path/2` : Paths to unmask separated by a colon. If set to **ALL**, it will
+  unmask all the paths that are masked by default.
+  The default masked paths are **/proc/acpi, /proc/kcore, /proc/keys, /proc/latency_stats, /proc/sched_debug, /proc/scsi, /proc/timer_list, /proc/timer_stats, /sys/firmware, and /sys/fs/selinux.**
+
 - `proc-opts=OPTIONS` : Comma separated list of options to use for the /proc mount. More details for the
   possible mount options are specified at **proc(5)** man page.
 

test/e2e/run_test.go

@@ -264,6 +264,14 @@ var _ = Describe("Podman run", func() {
 		session.WaitWithDefaultTimeout()
 		Expect(session.OutputToString()).To(BeEmpty())
 		Expect(session.ExitCode()).To(Equal(0))
+
+		session = podmanTest.Podman([]string{"run", "-d", "--name=maskCtr4", "--security-opt", "systempaths=unconfined", ALPINE, "sleep", "200"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		session = podmanTest.Podman([]string{"exec", "maskCtr4", "ls", "/sys/firmware"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.OutputToString()).To(Not(BeEmpty()))
+		Expect(session.ExitCode()).To(Equal(0))
 	})
 
 	It("podman run seccomp test", func() {