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git/branch: avoid spurious warnings when checking out remote branch

we would check if the remote branch existed before we switched, and
this would generate some error-not-an-error messages on the console.
don't do that.

--- a/sys/src/cmd/git/branch

+++ b/sys/src/cmd/git/branch

@@ -30,15 +30,13 @@

 if not

 	new=refs/heads/$branch

+# where are we now?

 orig=`{git/query HEAD}

 origbranch=refs/`{awk '$1=="branch"{print $2}' < $gitfs/ctl}

-if (~ $#baseref 1)

-	base=`{git/query $baseref} || exit 'bad base'

-if not if(~ $#newbr 0)

-	base=`{git/query $new}

-if not

-	base=`{git/query HEAD}

+# if we're switching branches to a branch that doesn't exist,

+# but we have a remote branch that exists upstream, create a

+# new head to mirror it.

 if(~ $#newbr 0){

 	if(! ~ $#baseref 0)

 		die update would clobber $branch with $baseref

@@ -45,8 +43,17 @@

 	baseref=`$nl{echo -n $new | sed s@refs/heads/@refs/remotes/origin/@}

 	if(! test -e .git/$new)

 		if(! base=`{git/query $baseref})

-			die could not find branch $branch

+			exit 'bad ref'

 }

+

+# figure out where we want the new branch to point to

+if (~ $#baseref 1)

+	base=`{git/query $baseref} || exit 'bad ref'

+if not if(~ $#newbr 0)

+	base=`{git/query $new} || exit 'bad ref'

+if not

+	base=`{git/query HEAD} || exit 'bad ref'

+

 modified=`$nl{git/query -c HEAD $base | grep '^[^-]' | subst '^..'}

 deleted=`$nl{git/query -c HEAD $base | grep '^-' | subst '^..'}

-- 

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