When examining merge commits in our Git hooks, only check the first parent

This does two things:

  1. We can properly validate log entries in merge commits.
  2. We don't check commits that were merged in from other branches.

* build-aux/git-hooks/commit-msg-files.awk (get_commit_changes): Get
the changes compared to the first parent.

* build-aux/git-hooks/pre-push: Only get the first parent of merge
commits when returning the rev-list, and only check "master" or
"emacs-NN" branches.

1 files changed, 1 insertions, 1 deletions

diff --git a/build-aux/git-hooks/commit-msg-files.awk b/build-aux/git-hooks/commit-msg-files.awk
index 2117681343f..5c9b70a5de5 100644
--- a/build-aux/git-hooks/commit-msg-files.awk
+++ b/build-aux/git-hooks/commit-msg-files.awk
@@ -33,7 +33,7 @@
 function get_commit_changes(commit_sha, changes,    cmd, i, j, len, \
                             bits, filename) {
   # Collect all the files touched in the specified commit.
-  cmd = ("git log -1 --name-status --format= " commit_sha)
+  cmd = ("git show --name-status --first-parent --format= " commit_sha)
   while ((cmd | getline) > 0) {
     for (i = 2; i <= NF; i++) {
       len = split($i, bits, "/")