allow specification of entrypoint in the form of a slice

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Closes: #1352
Approved by: mheon

cmd/podman/common.go

@@ -191,7 +191,7 @@ var createFlags = []cli.Flag{
 		Name:  "dns-search",
 		Usage: "Set custom DNS search domains",
 	},
-	cli.StringSliceFlag{
+	cli.StringFlag{
 		Name:  "entrypoint",
 		Usage: "Overwrite the default ENTRYPOINT of the image",
 	},

cmd/podman/create.go

@@ -316,6 +316,26 @@ func isPortInImagePorts(exposedPorts map[string]struct{}, port string) bool {
 	return false
 }
 
+func configureEntrypoint(c *cli.Context, data *inspect.ImageData) []string {
+	entrypoint := []string{}
+	if c.IsSet("entrypoint") {
+		// Force entrypoint to ""
+		if c.String("entrypoint") == "" {
+			return entrypoint
+		}
+		// Check if entrypoint specified is json
+		if err := json.Unmarshal([]byte(c.String("entrypoint")), &entrypoint); err == nil {
+			return entrypoint
+		}
+		// Return entrypoint as a single command
+		return []string{c.String("entrypoint")}
+	}
+	if data != nil {
+		return data.ContainerConfig.Entrypoint
+	}
+	return entrypoint
+}
+
 // Parses CLI options related to container creation into a config which can be
 // parsed into an OCI runtime spec
 func parseCreateOpts(ctx context.Context, c *cli.Context, runtime *libpod.Runtime, imageName string, data *inspect.ImageData) (*cc.CreateConfig, error) {
@@ -555,16 +575,7 @@ func parseCreateOpts(ctx context.Context, c *cli.Context, runtime *libpod.Runtim
 		workDir = data.ContainerConfig.WorkingDir
 	}
 
-	// ENTRYPOINT
-	// User input entrypoint takes priority over image entrypoint
-	entrypoint := c.StringSlice("entrypoint")
-	if len(entrypoint) == 0 && data != nil {
-		entrypoint = data.ContainerConfig.Entrypoint
-	}
-	// if entrypoint=, we need to clear the entrypoint
-	if len(entrypoint) == 1 && c.IsSet("entrypoint") && strings.Join(c.StringSlice("entrypoint"), "") == "" {
-		entrypoint = []string{}
-	}
+	entrypoint := configureEntrypoint(c, data)
 	// Build the command
 	// If we have an entry point, it goes first
 	if len(entrypoint) > 0 {

docs/podman-create.1.md

@@ -213,7 +213,7 @@ Set custom DNS options
 
 Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)
 
-**--entrypoint**=""
+**--entrypoint** *"command"* | *'["command", "arg1", ...]'*
 
 Overwrite the default ENTRYPOINT of the image
 
@@ -228,6 +228,8 @@ something else inside the container, so you can override the default ENTRYPOINT
 at runtime by using a **--entrypoint** and a string to specify the new
 ENTRYPOINT.
 
+You need to specify multi option commands in the form of a json string.
+
 **-e**, **--env**=[]
 
 Set environment variables

docs/podman-run.1.md

@@ -217,7 +217,7 @@ Set custom DNS options
 
 Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)
 
-**--entrypoint**=""
+**--entrypoint** *"command"* | *'["command", "arg1", ...]'*
 
 Overwrite the default ENTRYPOINT of the image
 
@@ -233,6 +233,8 @@ something else inside the container, so you can override the default ENTRYPOINT
 at runtime by using a **--entrypoint** and a string to specify the new
 ENTRYPOINT.
 
+You need to specify multi option commands in the form of a json string.
+
 **-e**, **--env**=[]
 
 Set environment variables

test/e2e/create_test.go

@@ -72,4 +72,41 @@ var _ = Describe("Podman create", func() {
 		Expect(ok).To(BeTrue())
 		Expect(value).To(Equal("WORLD"))
 	})
+
+	It("podman create --entrypoint command", func() {
+		session := podmanTest.Podman([]string{"create", "--entrypoint", "/bin/foobar", ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		Expect(podmanTest.NumberOfContainers()).To(Equal(1))
+
+		result := podmanTest.Podman([]string{"inspect", "-l", "--format", "{{.Config.Entrypoint}}"})
+		result.WaitWithDefaultTimeout()
+		Expect(result.ExitCode()).To(Equal(0))
+		Expect(result.OutputToString()).To(Equal("/bin/foobar"))
+	})
+
+	It("podman create --entrypoint \"\"", func() {
+		session := podmanTest.Podman([]string{"create", "--entrypoint", "", ALPINE, "ls"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		Expect(podmanTest.NumberOfContainers()).To(Equal(1))
+
+		result := podmanTest.Podman([]string{"inspect", "-l", "--format", "{{.Config.Entrypoint}}"})
+		result.WaitWithDefaultTimeout()
+		Expect(result.ExitCode()).To(Equal(0))
+		Expect(result.OutputToString()).To(Equal(""))
+	})
+
+	It("podman create --entrypoint json", func() {
+		jsonString := `[ "/bin/foo", "-c"]`
+		session := podmanTest.Podman([]string{"create", "--entrypoint", jsonString, ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		Expect(podmanTest.NumberOfContainers()).To(Equal(1))
+
+		result := podmanTest.Podman([]string{"inspect", "-l", "--format", "{{.Config.Entrypoint}}"})
+		result.WaitWithDefaultTimeout()
+		Expect(result.ExitCode()).To(Equal(0))
+		Expect(result.OutputToString()).To(Equal("/bin/foo -c"))
+	})
 })