Merge pull request #14301 from rhatdan/volume

Support setting image_volume_mode in containers.conf

cmd/podman/common/create.go

@@ -255,9 +255,8 @@ func DefineCreateFlags(cmd *cobra.Command, cf *entities.ContainerCreateOptions,
 		_ = cmd.RegisterFlagCompletionFunc(hostUserFlagName, completion.AutocompleteNone)
 
 		imageVolumeFlagName := "image-volume"
-		createFlags.StringVar(
-			&cf.ImageVolume,
-			imageVolumeFlagName, DefaultImageVolume,
+		createFlags.String(
+			imageVolumeFlagName, containerConfig.Engine.ImageVolumeMode,
 			`Tells podman how to handle the builtin image volumes ("bind"|"tmpfs"|"ignore")`,
 		)
 		_ = cmd.RegisterFlagCompletionFunc(imageVolumeFlagName, AutocompleteImageVolume)

cmd/podman/common/default.go

@@ -5,9 +5,6 @@ import (
 )
 
 var (
-
-	// DefaultImageVolume default value
-	DefaultImageVolume = "bind"
 	// Pull in configured json library
 	json = registry.JSONLibrary()
 )

cmd/podman/containers/create.go

@@ -102,16 +102,25 @@ func init() {
 	createFlags(containerCreateCommand)
 }
 
-func create(cmd *cobra.Command, args []string) error {
-	var (
-		err error
-	)
+func commonFlags(cmd *cobra.Command) error {
+	var err error
 	flags := cmd.Flags()
 	cliVals.Net, err = common.NetFlagsToNetOptions(nil, *flags)
 	if err != nil {
 		return err
 	}
 
+	if cmd.Flags().Changed("image-volume") {
+		cliVals.ImageVolume = cmd.Flag("image-volume").Value.String()
+	}
+	return nil
+}
+
+func create(cmd *cobra.Command, args []string) error {
+	if err := commonFlags(cmd); err != nil {
+		return err
+	}
+
 	// Check if initctr is used with --pod and the value is correct
 	if initctr := InitContainerType; cmd.Flags().Changed("init-ctr") {
 		if !cmd.Flags().Changed("pod") {
@@ -123,7 +132,7 @@ func create(cmd *cobra.Command, args []string) error {
 		cliVals.InitContainerType = initctr
 	}
 
-	cliVals, err = CreateInit(cmd, cliVals, false)
+	cliVals, err := CreateInit(cmd, cliVals, false)
 	if err != nil {
 		return err
 	}

cmd/podman/containers/run.go

@@ -109,7 +109,9 @@ func init() {
 }
 
 func run(cmd *cobra.Command, args []string) error {
-	var err error
+	if err := commonFlags(cmd); err != nil {
+		return err
+	}
 
 	// TODO: Breaking change should be made fatal in next major Release
 	if cliVals.TTY && cliVals.Interactive && !term.IsTerminal(int(os.Stdin.Fd())) {
@@ -122,14 +124,10 @@ func run(cmd *cobra.Command, args []string) error {
 		}
 	}
 
-	flags := cmd.Flags()
-	cliVals.Net, err = common.NetFlagsToNetOptions(nil, *flags)
-	if err != nil {
-		return err
-	}
 	runOpts.CIDFile = cliVals.CIDFile
 	runOpts.Rm = cliVals.Rm
-	if cliVals, err = CreateInit(cmd, cliVals, false); err != nil {
+	cliVals, err := CreateInit(cmd, cliVals, false)
+	if err != nil {
 		return err
 	}
 

pkg/specgenutil/createparse.go

@@ -18,20 +18,5 @@ func validate(c *entities.ContainerCreateOptions) error {
 		return err
 	}
 
-	var imageVolType = map[string]string{
-		"bind":   "",
-		"tmpfs":  "",
-		"ignore": "",
-	}
-	if _, ok := imageVolType[c.ImageVolume]; !ok {
-		switch {
-		case c.IsInfra:
-			c.ImageVolume = "bind"
-		case c.IsClone: // the image volume type will be deduced later from the container we are cloning
-			return nil
-		default:
-			return errors.Errorf("invalid image-volume type %q. Pick one of bind, tmpfs, or ignore", c.ImageVolume)
-		}
-	}
-	return nil
+	return config.ValidateImageVolumeMode(c.ImageVolume)
 }

pkg/specgenutil/specgen.go

@@ -229,9 +229,11 @@ func setNamespaces(s *specgen.SpecGenerator, c *entities.ContainerCreateOptions)
 }
 
 func FillOutSpecGen(s *specgen.SpecGenerator, c *entities.ContainerCreateOptions, args []string) error {
-	var (
-		err error
-	)
+	rtc, err := config.Default()
+	if err != nil {
+		return err
+	}
+
 	// validate flags as needed
 	if err := validate(c); err != nil {
 		return err
@@ -479,8 +481,13 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *entities.ContainerCreateOptions
 	if len(s.HostUsers) == 0 || len(c.HostUsers) != 0 {
 		s.HostUsers = c.HostUsers
 	}
-	if len(s.ImageVolumeMode) == 0 || len(c.ImageVolume) != 0 {
-		s.ImageVolumeMode = c.ImageVolume
+	if len(c.ImageVolume) != 0 {
+		if len(s.ImageVolumeMode) == 0 {
+			s.ImageVolumeMode = c.ImageVolume
+		}
+	}
+	if len(s.ImageVolumeMode) == 0 {
+		s.ImageVolumeMode = rtc.Engine.ImageVolumeMode
 	}
 	if s.ImageVolumeMode == "bind" {
 		s.ImageVolumeMode = "anonymous"
@@ -550,11 +557,6 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *entities.ContainerCreateOptions
 		s.CgroupsMode = c.CgroupsMode
 	}
 	if s.CgroupsMode == "" {
-		rtc, err := config.Default()
-		if err != nil {
-			return err
-		}
-
 		s.CgroupsMode = rtc.Cgroups()
 	}
 

test/system/160-volumes.bats

@@ -411,4 +411,43 @@ NeedsChown    | true
     fi
 }
 
+@test "podman --image-volume" {
+    tmpdir=$PODMAN_TMPDIR/volume-test
+    mkdir -p $tmpdir
+    containerfile=$tmpdir/Containerfile
+    cat >$containerfile <<EOF
+FROM $IMAGE
+VOLUME /data
+EOF
+    fs=$(stat -f -c %T .)
+    run_podman build -t volume_image $tmpdir
+
+    containersconf=$tmpdir/containers.conf
+    cat >$containersconf <<EOF
+[engine]
+image_volume_mode="tmpfs"
+EOF
+
+    run_podman run --image-volume tmpfs --rm volume_image stat -f -c %T /data
+    is "$output" "tmpfs" "Should be tmpfs"
+
+    run_podman 1 run --image-volume ignore --rm volume_image stat -f -c %T /data
+    is "$output" "stat: can't read file system information for '/data': No such file or directory" "Should fail with /data does not exists"
+
+    CONTAINERS_CONF="$containersconf" run_podman run --rm volume_image stat -f -c %T /data
+    is "$output" "tmpfs" "Should be tmpfs"
+
+    CONTAINERS_CONF="$containersconf" run_podman run --image-volume bind --rm volume_image stat -f -c %T /data
+    assert "$output" != "tmpfs" "Should match hosts $fs"
+
+    CONTAINERS_CONF="$containersconf" run_podman run --image-volume tmpfs --rm volume_image stat -f -c %T /data
+    is "$output" "tmpfs" "Should be tmpfs"
+
+    CONTAINERS_CONF="$containersconf" run_podman 1 run --image-volume ignore --rm volume_image stat -f -c %T /data
+    is "$output" "stat: can't read file system information for '/data': No such file or directory" "Should fail with /data does not exists"
+
+    run_podman rm --all --force -t 0
+    run_podman image rm --force localhost/volume_image
+}
+
 # vim: filetype=sh