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bug#29197: 27.0.50; pre-commit checks for new files against "head"

From: Noam Postavsky
Subject: bug#29197: 27.0.50; pre-commit checks for new files against "head"
Date: Wed, 14 Feb 2018 20:03:50 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux)

Noam Postavsky <address@hidden> writes:

>> I think the warning should be improved:
>> - I shouldn't get a warning in the above case, since this commit doesn't
>>   *add* those files (they weren't on origin/master admittedly but they were
>>   already on HEAD).
> We could choose which side of the merge to check based on an
> environment var (that was considered in the thread I referenced above,
> but we didn't see much of a use case at the time). Or is it possible
> to check only changes from the merge itself (i.e., in case of conflict
> resolution)?
>> - the warning should give me some hint about which file fails the test.
> Yeah, that would make sense.

This seems fairly difficult to do while keeping in standard bourne shell
syntax.  Not sure how to catch file names with whitespace.

>From fa94e7452be5ffb4d63ad2a40fc5b9fdeed3fed0 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <address@hidden>
Date: Wed, 14 Feb 2018 19:58:07 -0500
Subject: [PATCH v1] ; Let pre-commit git hook check merged in changes

* build-aux/git-hooks/pre-commit: If GIT_MERGE_CHECK_OTHER is 'true',
check changes against the merge target, rather than the current
branch.  Include file name when giving error message about
non-standard characters.
 build-aux/git-hooks/pre-commit | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/build-aux/git-hooks/pre-commit b/build-aux/git-hooks/pre-commit
index 5e42dab233..33d8c91168 100755
--- a/build-aux/git-hooks/pre-commit
+++ b/build-aux/git-hooks/pre-commit
@@ -28,7 +28,7 @@ LC_ALL=
 # When doing a two-way merge, ignore problems that came from the other
 # side of the merge.
-if test -r "$GIT_DIR"/MERGE_HEAD; then
+if test -r "$GIT_DIR"/MERGE_HEAD && test "$GIT_MERGE_CHECK_OTHER" != true; then
   merge_heads=`cat "$GIT_DIR"/MERGE_HEAD` || exit
   for merge_head in $merge_heads; do
     case $head in
@@ -42,13 +42,6 @@ head=
 git_diff='git diff --cached --name-only --diff-filter=A'
-nbadchars=`$git_diff -z $head | tr -d "$ok_chars" | wc -c`
-if test "$nbadchars" -ne 0; then
-  echo "File name does not consist of -+./_ or ASCII letters or digits."
-  exit 1
 for new_name in `$git_diff $head`; do
   case $new_name in
@@ -58,9 +51,20 @@ nbadchars=
     ChangeLog | */ChangeLog)
       echo "$new_name: Please use git commit messages, not ChangeLog files."
       exit 1;;
+    *[^-+./_0-9A-Z_a-z]*)
+      echo "$new_name: File name does not consist of -+./_ or ASCII letters or 
+      exit 1;;
+nbadchars=`$git_diff -z $head | tr -d "$ok_chars" | wc -c`
+if test "$nbadchars" -ne 0; then
+  echo "A file name has whitespace."
+  exit 1
 # The '--check' option of git diff-index makes Git complain if changes
 # introduce whitespace errors.  This can be a pain when editing test
 # files that deliberately contain lines with trailing whitespace.

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