Implemented --iidfile for podman commit

Added flag to Write the image ID to the file with podman commit command.
Fix to issue #5461

Signed-off-by: Sujil02 <sushah@redhat.com>

cmd/podman/cliconfig/config.go

@@ -115,6 +115,7 @@ type CommitValues struct {
 	Pause          bool
 	Quiet          bool
 	IncludeVolumes bool
+	ImageIDFile    string
 }
 
 type ContainersPrune struct {

cmd/podman/commit.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"io/ioutil"
 	"strings"
 
 	"github.com/containers/libpod/cmd/podman/cliconfig"
@@ -41,6 +42,7 @@ func init() {
 	flags := commitCommand.Flags()
 	flags.StringArrayVarP(&commitCommand.Change, "change", "c", []string{}, fmt.Sprintf("Apply the following possible instructions to the created image (default []): %s", strings.Join(ChangeCmds, " | ")))
 	flags.StringVarP(&commitCommand.Format, "format", "f", "oci", "`Format` of the image manifest and metadata")
+	flags.StringVarP(&commitCommand.ImageIDFile, "iidfile", "", "", "`file` to write the image ID to")
 	flags.StringVarP(&commitCommand.Message, "message", "m", "", "Set commit message for imported image")
 	flags.StringVarP(&commitCommand.Author, "author", "a", "", "Set the author for the image committed")
 	flags.BoolVarP(&commitCommand.Pause, "pause", "p", false, "Pause container during commit")
@@ -70,6 +72,11 @@ func commitCmd(c *cliconfig.CommitValues) error {
 	if err != nil {
 		return err
 	}
+	if c.ImageIDFile != "" {
+		if err = ioutil.WriteFile(c.ImageIDFile, []byte(iid), 0644); err != nil {
+			return errors.Wrapf(err, "failed to write image ID to file %q", c.ImageIDFile)
+		}
+	}
 	fmt.Println(iid)
 	return nil
 }

completions/bash/podman

@@ -1247,6 +1247,7 @@ _podman_commit() {
 	-c
 	--message
 	-m
+	--iidfile
      "
     local boolean_options="
 	--help

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

@@ -38,6 +38,10 @@ Can be set multiple times
 Set the format of the image manifest and metadata.  The currently supported formats are _oci_ and _docker_.  If
 not specifically set, the default format used is _oci_.
 
+**--iidfile**=*ImageIDfile*
+
+Write the image ID to the file.
+
 **--include-volumes**
 
 Include in the committed image any volumes added to the container by the `--volume` or `--mount` options to the `podman create` and `podman run` commands.

test/e2e/build_test.go

@@ -152,4 +152,27 @@ var _ = Describe("Podman build", func() {
 		Expect(strings.Fields(session.OutputToString())).
 			To(ContainElement("scratch"))
 	})
+
+	It("podman build basic alpine and print id to external file", func() {
+
+		// Switch to temp dir and restore it afterwards
+		cwd, err := os.Getwd()
+		Expect(err).To(BeNil())
+		Expect(os.Chdir(os.TempDir())).To(BeNil())
+		defer Expect(os.Chdir(cwd)).To(BeNil())
+
+		targetPath := filepath.Join(os.TempDir(), "dir")
+		targetFile := filepath.Join(targetPath, "idFile")
+
+		session := podmanTest.PodmanNoCache([]string{"build", "build/basicalpine", "--iidfile", targetFile})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		id, _ := ioutil.ReadFile(targetFile)
+
+		// Verify that id is correct
+		inspect := podmanTest.PodmanNoCache([]string{"inspect", string(id)})
+		inspect.WaitWithDefaultTimeout()
+		data := inspect.InspectImageJSON()
+		Expect(data[0].ID).To(Equal(string(id)))
+	})
 })

test/e2e/commit_test.go

@@ -1,7 +1,9 @@
 package integration
 
 import (
+	"io/ioutil"
 	"os"
+	"path/filepath"
 
 	. "github.com/containers/libpod/test/utils"
 	. "github.com/onsi/ginkgo"
@@ -234,4 +236,30 @@ var _ = Describe("Podman commit", func() {
 		}
 		Expect(envMap["TEST=1=1-01=9.01"]).To(BeTrue())
 	})
+
+	It("podman commit container and print id to external file", func() {
+		// Switch to temp dir and restore it afterwards
+		cwd, err := os.Getwd()
+		Expect(err).To(BeNil())
+		Expect(os.Chdir(os.TempDir())).To(BeNil())
+		targetPath := filepath.Join(os.TempDir(), "dir")
+		Expect(os.MkdirAll(targetPath, 0755)).To(BeNil())
+		targetFile := filepath.Join(targetPath, "idFile")
+		defer Expect(os.RemoveAll(targetFile)).To(BeNil())
+		defer Expect(os.Chdir(cwd)).To(BeNil())
+
+		_, ec, _ := podmanTest.RunLsContainer("test1")
+		Expect(ec).To(Equal(0))
+		Expect(podmanTest.NumberOfContainers()).To(Equal(1))
+
+		session := podmanTest.Podman([]string{"commit", "test1", "foobar.com/test1-image:latest", "--iidfile", targetFile})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		id, _ := ioutil.ReadFile(targetFile)
+		check := podmanTest.Podman([]string{"inspect", "foobar.com/test1-image:latest"})
+		check.WaitWithDefaultTimeout()
+		data := check.InspectImageJSON()
+		Expect(data[0].ID).To(Equal(string(id)))
+	})
 })