init: handle -c conflicts with gitc-init

We keep getting requests for init to support -c.  This conflicts with
gitc-init which allocates -c for its own use.  Lets make this dynamic
so we keep it with "init" but omit it for "gitc-init".

Bug: https://crbug.com/gerrit/10200
Change-Id: Ibf69c2bbeff638e28e63cb08926fea0c622258db
(cherry picked from commit 66098f707a1a3f352aac4c4bb2c4f88da070ca2a)
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/253392
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>

subcmds/gitc_init.py

@@ -50,7 +50,7 @@ use for this GITC client.
 """
 
   def _Options(self, p):
-    super(GitcInit, self)._Options(p)
+    super(GitcInit, self)._Options(p, gitc_init=True)
     g = p.add_option_group('GITC options')
     g.add_option('-f', '--manifest-file',
                  dest='manifest_file',

subcmds/init.py

@@ -81,7 +81,7 @@ manifest, a subsequent `repo sync` (or `repo sync -d`) is necessary
 to update the working directory files.
 """
 
-  def _Options(self, p):
+  def _Options(self, p, gitc_init=False):
     # Logging
     g = p.add_option_group('Logging options')
     g.add_option('-q', '--quiet',
@@ -96,7 +96,12 @@ to update the working directory files.
     g.add_option('-b', '--manifest-branch',
                  dest='manifest_branch',
                  help='manifest branch or revision', metavar='REVISION')
-    g.add_option('-c', '--current-branch',
+    cbr_opts = ['--current-branch']
+    # The gitc-init subcommand allocates -c itself, but a lot of init users
+    # want -c, so try to satisfy both as best we can.
+    if gitc_init:
+      cbr_opts += ['-c']
+    g.add_option(*cbr_opts,
                  dest='current_branch_only', action='store_true',
                  help='fetch only current manifest branch from server')
     g.add_option('-m', '--manifest-name',