dim: check for empty pulls

This could be a parsing error of the pull (for all the people who
don't use a script like dim pull-request to make sure all the silly
details are right), or some confusion on the part of the sender, or
something else.

Either way not good to continue.

v2: Use -z and drop the wc -l (Jani).

Cc: Dave Airlie <airlied@gmail.com>
Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/dim b/dim
index 29801b910481..09e9e91e9eb2 100755
--- a/dim
+++ b/dim
@@ -939,6 +939,10 @@ function dim_apply_pull
 	echo Pulling $pull_branch ...
 
 	git fetch $pull_branch
+	if [[ -z "$(git rev-list HEAD..FETCH_HEAD)" ]] ; then
+		warn_or_fail "Nothing in the pull request"
+	fi
+
 	checkpatch_commit_push_range "HEAD..FETCH_HEAD"
 
 	if ! $DRY git pull $pull_branch ; then