Merge pull request #209 from rikislaw/entrypoint_in_docker_style

Podman entrypoint works the same as for docker driver

Author: lgfa29

CHANGELOG.md

@@ -5,6 +5,7 @@ IMPROVEMENTS:
 * config: Add `extra_labels` option [[GH-215](https://github.com/hashicorp/nomad-driver-podman/pull/215)]
 * config: Allow setting `pids_limit` option. [[GH-203](https://github.com/hashicorp/nomad-driver-podman/pull/203)]
 * config: Allow setting `userns` option. [[GH-212](https://github.com/hashicorp/nomad-driver-podman/pull/212)]
+* config: Allow setting `entrypoint` as a list of strings. [[GH-209](https://github.com/hashicorp/nomad-driver-podman/pull/209)]
 * runtime: Set mount propagation from TaskConfig [[GH-204](https://github.com/hashicorp/nomad-driver-podman/pull/204)]
 
 BUG FIXES:

README.md

@@ -218,11 +218,14 @@ config {
 }
 ```
 
-* **entrypoint** - (Optional) The entrypoint for the container. Defaults to the entrypoint set in the image.
+* **entrypoint** - (Optional) A string list overriding the image's entrypoint. Defaults to the entrypoint set in the image.
 
 ```hcl
 config {
-  entrypoint = "/entrypoint.sh"
+  entrypoint = [
+    "/bin/bash",
+    "-c"
+  ]
 }
 ```
 

config.go

@@ -61,10 +61,13 @@ var (
 		"cpu_hard_limit": hclspec.NewAttr("cpu_hard_limit", "bool", false),
 		"cpu_cfs_period": hclspec.NewAttr("cpu_cfs_period", "number", false),
 		"devices":        hclspec.NewAttr("devices", "list(string)", false),
-		"entrypoint":     hclspec.NewAttr("entrypoint", "string", false),
-		"working_dir":    hclspec.NewAttr("working_dir", "string", false),
-		"hostname":       hclspec.NewAttr("hostname", "string", false),
-		"image":          hclspec.NewAttr("image", "string", true),
+
+		// Use `any` to maintain backwards compability.
+		// Expected type is `list(string)` but may be `string` for old tasks.
+		"entrypoint":  hclspec.NewAttr("entrypoint", "any", false),
+		"working_dir": hclspec.NewAttr("working_dir", "string", false),
+		"hostname":    hclspec.NewAttr("hostname", "string", false),
+		"image":       hclspec.NewAttr("image", "string", true),
 		"image_pull_timeout": hclspec.NewDefault(
 			hclspec.NewAttr("image_pull_timeout", "string", false),
 			hclspec.NewLiteral(`"5m"`),
@@ -131,18 +134,21 @@ type PluginConfig struct {
 
 // TaskConfig is the driver configuration of a task within a job
 type TaskConfig struct {
-	ApparmorProfile   string             `codec:"apparmor_profile"`
-	Args              []string           `codec:"args"`
-	Auth              AuthConfig         `codec:"auth"`
-	Ports             []string           `codec:"ports"`
-	Tmpfs             []string           `codec:"tmpfs"`
-	Volumes           []string           `codec:"volumes"`
-	CapAdd            []string           `codec:"cap_add"`
-	CapDrop           []string           `codec:"cap_drop"`
-	SelinuxOpts       []string           `codec:"selinux_opts"`
-	Command           string             `codec:"command"`
-	Devices           []string           `codec:"devices"`
-	Entrypoint        string             `codec:"entrypoint"`
+	ApparmorProfile string     `codec:"apparmor_profile"`
+	Args            []string   `codec:"args"`
+	Auth            AuthConfig `codec:"auth"`
+	Ports           []string   `codec:"ports"`
+	Tmpfs           []string   `codec:"tmpfs"`
+	Volumes         []string   `codec:"volumes"`
+	CapAdd          []string   `codec:"cap_add"`
+	CapDrop         []string   `codec:"cap_drop"`
+	SelinuxOpts     []string   `codec:"selinux_opts"`
+	Command         string     `codec:"command"`
+	Devices         []string   `codec:"devices"`
+
+	// Use `any` to maintain backwards compability.
+	// Expected type is `[]string` but may be `string` for old tasks.
+	Entrypoint        any                `codec:"entrypoint"`
 	WorkingDir        string             `codec:"working_dir"`
 	Hostname          string             `codec:"hostname"`
 	Image             string             `codec:"image"`

driver.go

@@ -419,8 +419,21 @@ func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drive
 	}
 	allArgs = append(allArgs, driverConfig.Args...)
 
-	if driverConfig.Entrypoint != "" {
-		createOpts.ContainerBasicConfig.Entrypoint = append(createOpts.ContainerBasicConfig.Entrypoint, driverConfig.Entrypoint)
+	// Parse entrypoint.
+	switch v := driverConfig.Entrypoint.(type) {
+	case string:
+		// Check for a string type to maintain backwards compatibility.
+		d.logger.Warn("Defining the entrypoint as a string has been deprecated, use a list of strings instead.")
+		createOpts.ContainerBasicConfig.Entrypoint = append(createOpts.ContainerBasicConfig.Entrypoint, v)
+	case []interface{}:
+		entrypoint := make([]string, len(v))
+		for i, e := range v {
+			entrypoint[i] = fmt.Sprintf("%v", e)
+		}
+		createOpts.ContainerBasicConfig.Entrypoint = entrypoint
+	case nil:
+	default:
+		return nil, nil, fmt.Errorf("invalid entrypoint type %T", driverConfig.Entrypoint)
 	}
 
 	containerName := BuildContainerName(cfg)