style: use import git_refs everywhere

Align with Google style guides and `import git_refs` as a module
rather than import symbols out of it.

Change-Id: I4e33ebdf3b06acd94494f32cdf39aa58427cd4b2
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/648703
Reviewed-by: Brian Gan <brgan@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

subcmds/info.py

@@ -23,8 +23,7 @@ from typing import Any, Dict, List, NamedTuple, Optional, Tuple
 from color import Coloring
 from command import DEFAULT_LOCAL_JOBS
 from command import PagedCommand
-from git_refs import R_HEADS
-from git_refs import R_M
+import git_refs
 
 
 class BranchInfo(NamedTuple):
@@ -333,9 +332,9 @@ class Info(PagedCommand):
             branch = project.manifest.manifestProject.config.GetBranch(
                 "default"
             ).merge
-            if branch.startswith(R_HEADS):
-                branch = branch[len(R_HEADS) :]
-            logTarget = R_M + branch
+            if branch.startswith(git_refs.R_HEADS):
+                branch = branch[len(git_refs.R_HEADS) :]
+            logTarget = git_refs.R_M + branch
 
             localCommits, originCommits = cls._GetDiffCommits(
                 project, logTarget

subcmds/sync.py

@@ -62,8 +62,7 @@ import event_log
 import git_command
 from git_config import GetUrlCookieFile
 from git_config import RepoConfig
-from git_refs import HEAD
-from git_refs import R_HEADS
+import git_refs
 import git_superproject
 from hooks import RepoHook
 from manifest_xml import XmlManifest
@@ -866,8 +865,8 @@ later is required to fix a server side protocol bug.
         """
         b = manifest_project.GetBranch(manifest_project.CurrentBranch)
         branch = b.merge
-        if branch.startswith(R_HEADS):
-            branch = branch[len(R_HEADS) :]
+        if branch.startswith(git_refs.R_HEADS):
+            branch = branch[len(git_refs.R_HEADS) :]
         return branch
 
     @classmethod
@@ -3501,7 +3500,10 @@ def _PostRepoFetch(rp, repo_verify=True, verbose=False):
             logger.warning("warning: Skipped upgrade to unverified version")
     else:
         if verbose:
-            print("repo version %s is current" % rp.work_git.describe(HEAD))
+            print(
+                "repo version %s is current"
+                % rp.work_git.describe(git_refs.HEAD)
+            )
 
 
 class _FetchTimes:

subcmds/upload.py

@@ -23,7 +23,7 @@ from command import DEFAULT_LOCAL_JOBS
 from command import InteractiveCommand
 from editor import Editor
 import error
-from git_refs import R_HEADS
+import git_refs
 import git_superproject
 from hooks import RepoHook
 from project import ReviewableBranch
@@ -607,11 +607,11 @@ Gerrit Code Review:  https://www.gerritcodereview.com/
             )
 
             full_dest = destination
-            if not full_dest.startswith(R_HEADS):
-                full_dest = R_HEADS + full_dest
+            if not full_dest.startswith(git_refs.R_HEADS):
+                full_dest = git_refs.R_HEADS + full_dest
             full_revision = branch.project.revisionExpr
-            if not full_revision.startswith(R_HEADS):
-                full_revision = R_HEADS + full_revision
+            if not full_revision.startswith(git_refs.R_HEADS):
+                full_revision = git_refs.R_HEADS + full_revision
 
             # If the merge branch of the local branch is different from
             # the project's revision AND destination, this might not be

subcmds/version.py

@@ -19,7 +19,7 @@ from typing import Any, Tuple
 from command import Command
 from command import MirrorSafeCommand
 import git_command
-from git_refs import HEAD
+import git_refs
 from wrapper import Wrapper
 
 
@@ -38,15 +38,15 @@ class Version(Command, MirrorSafeCommand):
         """Return repo's describe string and commit date."""
         if git_command.git_require((2, 32, 0)):
             output = project.bare_git.log(
-                "-1", "--format=%(describe)%n%cD", HEAD
+                "-1", "--format=%(describe)%n%cD", git_refs.HEAD
             )
             description, commit_date = output.rstrip("\n").split("\n", 1)
             if description:
                 return description, commit_date
 
         return (
-            project.bare_git.describe(HEAD),
-            project.bare_git.log("-1", "--format=%cD", HEAD),
+            project.bare_git.describe(git_refs.HEAD),
+            project.bare_git.log("-1", "--format=%cD", git_refs.HEAD),
         )
 
     def Execute(self, opt, args):