label docker image with git repo url

fixes #77

blackbox-test/features/package.feature

@@ -222,14 +222,16 @@ Feature: package task
     """yaml
     docker_image_name: elsyblackbox_docker_label_test
     """
-    When I run `lc package --git-commit=c8dfd9f`
+    When I run `lc package --git-commit=c8dfd9f --git-url=foobaz`
     Then it should succeed
     And the output should contain all of these:
       | Image is up to date for alpine:latest                       |
       | Attaching image label: com.elsy.metadata.git-commit=c8dfd9f |
+      | Attaching image label: com.elsy.metadata.git-url=foobaz     |
     And the image 'elsyblackbox_docker_label_test' should exist
     And it should have the following labels:
-      | com.elsy.metadata.git-commit:c8dfd9f              |
+      | com.elsy.metadata.git-commit:c8dfd9f |
+      | com.elsy.metadata.git-url:foobaz     |
 
   Scenario: custom package script generating the Dockerfile
     Given a file named "docker-compose.yml" with:

command/package.go

@@ -28,6 +28,9 @@ import (
 // commitLabel identifies the git commit the image was built from
 const commitLabel = "com.elsy.metadata.git-commit"
 
+// repoLabel identifies the git repo the image was built from
+const repoLabel = "com.elsy.metadata.git-url"
+
 // CmdPackage runs package service if present and then attempts to build Dockerfile.
 // Unless --skip-tests is passed, it *will* run the tests, and any failures will abort
 // the packaging process.
@@ -114,5 +117,11 @@ func constructLabelArgs(c *cli.Context) (labelArgs []string) {
 		labelArgs = append(labelArgs, "--label", fmt.Sprintf("%s=%s", commitLabel, commit))
 	}
 
+	gitUrl := c.String("git-url")
+	if gitUrl != "" {
+		logrus.Infof("Attaching image label: %s=%s", repoLabel, gitUrl)
+		labelArgs = append(labelArgs, "--label", fmt.Sprintf("%s=%s", repoLabel, gitUrl))
+	}
+
 	return
 }

main/commands.go

@@ -159,6 +159,11 @@ func Commands() []cli.Command {
 					Usage:  "Git commit that is being built",
 					EnvVar: "GIT_COMMIT",
 				},
+				cli.StringFlag{
+					Name:   "git-url",
+					Usage:  "Git repo that is being built",
+					EnvVar: "GIT_URL",
+				},
 				cli.StringFlag{
 					Name:  "build-logs-dir",
 					Value: GetConfigFileString("build_logs_dir"),
@@ -243,6 +248,11 @@ func Commands() []cli.Command {
 					Usage:  "Git commit that is being built",
 					EnvVar: "GIT_COMMIT",
 				},
+				cli.StringFlag{
+					Name:   "git-url",
+					Usage:  "Git repo that is being built",
+					EnvVar: "GIT_URL",
+				},
 			},
 		},
 		{