project: Add REPO_PROJECT_FETCH_URL environment variable

Add REPO_PROJECT_FETCH_URL to Project.GetEnvVars(), which resolves to
the remote fetch URL of the project. This is useful for exposing the
URL to custom fetch commands or other external scripts.

Bug: 513329573
Change-Id: Ic2b0a83493934d16bb1152366ee4e1a2c35ea2dc
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/596121
Tested-by: Gavin Mak <gavinmak@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>

man/repo-forall.1

@@ -125,6 +125,8 @@ REPO_UPSTREAM is the name of the upstream branch as specified in the manifest.
 REPO_DEST_BRANCH is the name of the destination branch for code review, as
 specified in the manifest.
 .PP
+REPO_PROJECT_FETCH_URL is the full resolved fetch URL for the project.
+.PP
 REPO_COUNT is the total number of projects being iterated.
 .PP
 REPO_I is the current (1\-based) iteration count. Can be used in conjunction with

project.py

@@ -680,6 +680,7 @@ class Project:
         setenv("REPO_INNERPATH", self.relpath)
         setenv("REPO_PATH", self.RelPath(local=local))
         setenv("REPO_REMOTE", self.remote.name)
+        setenv("REPO_PROJECT_FETCH_URL", self.remote.url)
 
         try:
             lrev = "" if self.manifest.IsMirror else self.GetRevisionId()

subcmds/forall.py

@@ -107,6 +107,8 @@ manifest.
 REPO_DEST_BRANCH is the name of the destination branch for code review,
 as specified in the manifest.
 
+REPO_PROJECT_FETCH_URL is the full resolved fetch URL for the project.
+
 REPO_COUNT is the total number of projects being iterated.
 
 REPO_I is the current (1-based) iteration count. Can be used in

tests/test_project.py

@@ -1060,6 +1060,9 @@ class GetEnvVarsTests(unittest.TestCase):
             self.assertEqual(env["REPO_RREV"], "main")
             self.assertEqual(env["REPO_UPSTREAM"], "upstream-branch")
             self.assertEqual(env["REPO_DEST_BRANCH"], "dest-branch")
+            self.assertEqual(
+                env["REPO_PROJECT_FETCH_URL"], "http://example.com/repo"
+            )
 
     def test_get_env_vars_non_local(self):
         """Test environment variables generation with local=False."""