split out cli validation from executionv1.13.5

A common pattern in our subcommands is to verify the arguments &
options before executing things.  For some subcommands, that check
stage is quite long which makes the execution function even bigger.
Lets split that logic out of the execute phase so it's easier to
manage these.

This is most noticeable in the sync subcommand whose Execute func
is quite large, and the option checking makes up ~15% of it.

The manifest command's Execute can be simplified significantly as
the optparse configuration always sets output_file to a string.

Change-Id: I7097847ff040e831345e63de6b467ee17609990e
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/234834
Reviewed-by: David Pursehouse <dpursehouse@collab.net>
Tested-by: Mike Frysinger <vapier@google.com>

1 files changed, 14 insertions, 20 deletions

diff --git a/subcmds/sync.py b/subcmds/sync.py
index 3eab2fcf..5655a1e6 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -738,36 +738,30 @@ later is required to fix a server side protocol bug.
       fd.close()
     return 0
 
-  def Execute(self, opt, args):
-    if opt.jobs:
-      self.jobs = opt.jobs
-    if self.jobs > 1:
-      soft_limit, _ = _rlimit_nofile()
-      self.jobs = min(self.jobs, (soft_limit - 5) // 3)
-
+  def ValidateOptions(self, opt, args):
     if opt.force_broken:
       print('warning: -f/--force-broken is now the default behavior, and the '
             'options are deprecated', file=sys.stderr)
     if opt.network_only and opt.detach_head:
-      print('error: cannot combine -n and -d', file=sys.stderr)
-      sys.exit(1)
+      self.OptionParser.error('cannot combine -n and -d')
     if opt.network_only and opt.local_only:
-      print('error: cannot combine -n and -l', file=sys.stderr)
-      sys.exit(1)
+      self.OptionParser.error('cannot combine -n and -l')
     if opt.manifest_name and opt.smart_sync:
-      print('error: cannot combine -m and -s', file=sys.stderr)
-      sys.exit(1)
+      self.OptionParser.error('cannot combine -m and -s')
     if opt.manifest_name and opt.smart_tag:
-      print('error: cannot combine -m and -t', file=sys.stderr)
-      sys.exit(1)
+      self.OptionParser.error('cannot combine -m and -t')
     if opt.manifest_server_username or opt.manifest_server_password:
       if not (opt.smart_sync or opt.smart_tag):
-        print('error: -u and -p may only be combined with -s or -t',
-              file=sys.stderr)
-        sys.exit(1)
+        self.OptionParser.error('-u and -p may only be combined with -s or -t')
       if None in [opt.manifest_server_username, opt.manifest_server_password]:
-        print('error: both -u and -p must be given', file=sys.stderr)
-        sys.exit(1)
+        self.OptionParser.error('both -u and -p must be given')
+
+  def Execute(self, opt, args):
+    if opt.jobs:
+      self.jobs = opt.jobs
+    if self.jobs > 1:
+      soft_limit, _ = _rlimit_nofile()
+      self.jobs = min(self.jobs, (soft_limit - 5) // 3)
 
     if opt.manifest_name:
       self.manifest.Override(opt.manifest_name)