podman rm/stop --cidfile

Add a --cidfile flag to podman rm/stop to pass a container ID via a
file.  Podman run already provides the functionaly to store the ID
in a specified file which we now complete with rm/stop.  This allows
for a better life-cycle management in systemd services.  Note that
--cdifile can be specified multiple times to rm/stop.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 29 insertions, 8 deletions

diff --git a/cmd/podman/common.go b/cmd/podman/common.go
index 4db043f31..442823d2d 100644
--- a/cmd/podman/common.go
+++ b/cmd/podman/common.go
@@ -39,24 +39,45 @@ func shortID(id string) string {
 	return id
 }
 
-// checkAllAndLatest checks that --all and --latest are used correctly
-func checkAllAndLatest(c *cobra.Command, args []string, ignoreArgLen bool) error {
+// checkAllLatestAndCIDFile checks that --all and --latest are used correctly.
+// If cidfile is set, also check for the --cidfile flag.
+func checkAllLatestAndCIDFile(c *cobra.Command, args []string, ignoreArgLen bool, cidfile bool) error {
 	argLen := len(args)
 	if c.Flags().Lookup("all") == nil || c.Flags().Lookup("latest") == nil {
-		return errors.New("unable to lookup values for 'latest' or 'all'")
+		if !cidfile {
+			return errors.New("unable to lookup values for 'latest' or 'all'")
+		} else if c.Flags().Lookup("cidfile") == nil {
+			return errors.New("unable to lookup values for 'latest', 'all' or 'cidfile'")
+		}
+	}
+
+	specifiedAll, _ := c.Flags().GetBool("all")
+	specifiedLatest, _ := c.Flags().GetBool("latest")
+	specifiedCIDFile := false
+	if cid, _ := c.Flags().GetStringArray("cidfile"); len(cid) > 0 {
+		specifiedCIDFile = true
 	}
-	all, _ := c.Flags().GetBool("all")
-	latest, _ := c.Flags().GetBool("latest")
-	if all && latest {
+
+	if specifiedCIDFile && (specifiedAll || specifiedLatest) {
+		return errors.Errorf("--all, --latest and --cidfile cannot be used together")
+	} else if specifiedAll && specifiedLatest {
 		return errors.Errorf("--all and --latest cannot be used together")
 	}
+
 	if ignoreArgLen {
 		return nil
 	}
-	if (all || latest) && argLen > 0 {
+	if (argLen > 0) && (specifiedAll || specifiedLatest) {
 		return errors.Errorf("no arguments are needed with --all or --latest")
+	} else if cidfile && (argLen > 0) && (specifiedAll || specifiedLatest || specifiedCIDFile) {
+		return errors.Errorf("no arguments are needed with --all, --latest or --cidfile")
 	}
-	if argLen < 1 && !all && !latest {
+
+	if specifiedCIDFile {
+		return nil
+	}
+
+	if argLen < 1 && !specifiedAll && !specifiedLatest && !specifiedCIDFile {
 		return errors.Errorf("you must provide at least one name or id")
 	}
 	return nil