cmd, podman: do not override entrypoint if unset

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

4 files changed, 19 insertions, 14 deletions

diff --git a/cmd/podman/common/create.go b/cmd/podman/common/create.go
index e64b84519..0f9476754 100644
--- a/cmd/podman/common/create.go
+++ b/cmd/podman/common/create.go
@@ -153,9 +153,7 @@ func GetCreateFlags(cf *ContainerCLIOpts) *pflag.FlagSet {
 		"device-write-iops", []string{},
 		"Limit write rate (IO per second) to a device (e.g. --device-write-iops=/dev/sda:1000)",
 	)
-	createFlags.StringVar(
-		&cf.Entrypoint,
-		"entrypoint", "",
+	createFlags.String("entrypoint", "",
 		"Overwrite the default ENTRYPOINT of the image",
 	)
 	createFlags.StringArrayVarP(
diff --git a/cmd/podman/common/create_opts.go b/cmd/podman/common/create_opts.go
index 2f08bb6a6..c275b1674 100644
--- a/cmd/podman/common/create_opts.go
+++ b/cmd/podman/common/create_opts.go
@@ -31,7 +31,7 @@ type ContainerCLIOpts struct {
 	DeviceReadIOPs    []string
 	DeviceWriteBPs    []string
 	DeviceWriteIOPs   []string
-	Entrypoint        string
+	Entrypoint        *string
 	env               []string
 	EnvHost           bool
 	EnvFile           []string
diff --git a/cmd/podman/common/specgen.go b/cmd/podman/common/specgen.go
index f8c58f1a4..9c8b8fe9f 100644
--- a/cmd/podman/common/specgen.go
+++ b/cmd/podman/common/specgen.go
@@ -364,20 +364,20 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 	s.WorkDir = workDir
 	entrypoint := []string{}
 	userCommand := []string{}
-	if ep := c.Entrypoint; len(ep) > 0 {
-		// Check if entrypoint specified is json
-		if err := json.Unmarshal([]byte(c.Entrypoint), &entrypoint); err != nil {
-			entrypoint = append(entrypoint, ep)
+	if c.Entrypoint != nil {
+		if ep := *c.Entrypoint; len(ep) > 0 {
+			// Check if entrypoint specified is json
+			if err := json.Unmarshal([]byte(*c.Entrypoint), &entrypoint); err != nil {
+				entrypoint = append(entrypoint, ep)
+			}
 		}
+		s.Entrypoint = entrypoint
 	}
-
 	var command []string
 
-	s.Entrypoint = entrypoint
-
 	// Build the command
 	// If we have an entry point, it goes first
-	if len(entrypoint) > 0 {
+	if c.Entrypoint != nil {
 		command = entrypoint
 	}
 	if len(inputCommand) > 0 {
@@ -386,9 +386,12 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 		userCommand = append(userCommand, inputCommand...)
 	}
 
-	if len(inputCommand) > 0 {
+	switch {
+	case len(inputCommand) > 0:
 		s.Command = userCommand
-	} else {
+	case c.Entrypoint != nil:
+		s.Command = []string{}
+	default:
 		s.Command = command
 	}
 
diff --git a/cmd/podman/containers/create.go b/cmd/podman/containers/create.go
index 9e2d47d21..f4fc6fabc 100644
--- a/cmd/podman/containers/create.go
+++ b/cmd/podman/containers/create.go
@@ -165,6 +165,10 @@ func createInit(c *cobra.Command) error {
 	if c.Flag("cgroupns").Changed {
 		cliVals.CGroupsNS = c.Flag("cgroupns").Value.String()
 	}
+	if c.Flag("entrypoint").Changed {
+		val := c.Flag("entrypoint").Value.String()
+		cliVals.Entrypoint = &val
+	}
 
 	// Docker-compatibility: the "-h" flag for run/create is reserved for
 	// the hostname (see https://github.com/containers/libpod/issues/1367).