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git/t/t7505-prepare-commit-msg-hook.sh
Paolo Bonzini 8089c85bcb git-commit: add a prepare-commit-msg hook
The prepare-commit-msg hook is run whenever a "fresh" commit message
is prepared, just before it is shown in the editor (if it is).
Its purpose is to modify the commit message in-place.

It takes one to three parameters.  The first is the name of the file that
the commit log message.  The second is the source of the commit message,
and can be: "message" (if a -m or -F option was given); "template" (if a
-t option was given or the configuration option commit.template is set);
"merge" (if the commit is a merge or a .git/MERGE_MSG file exists);
"squash" (if a .git/SQUASH_MSG file exists); or "commit", followed by
a commit SHA1 as the third parameter (if a -c, -C or --amend option
was given).

If its exit status is non-zero, git-commit will abort.  The hook is
not suppressed by the --no-verify option, so it should not be used
as a replacement for the pre-commit hook.

The sample prepare-commit-msg comments out the `Conflicts:` part of
a merge's commit message; other examples are commented out, including
adding a Signed-off-by line at the bottom of the commit messsage,
that the user can then edit or discard altogether.

Signed-off-by: Paolo Bonzini <bonzini@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-06 02:26:55 -08:00

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#!/bin/sh
test_description='prepare-commit-msg hook'
. ./test-lib.sh
test_expect_success 'with no hook' '
echo "foo" > file &&
git add file &&
git commit -m "first"
'
# set up fake editor for interactive editing
cat > fake-editor <<'EOF'
#!/bin/sh
exit 0
EOF
chmod +x fake-editor
FAKE_EDITOR="$(pwd)/fake-editor"
export FAKE_EDITOR
# now install hook that always succeeds and adds a message
HOOKDIR="$(git rev-parse --git-dir)/hooks"
HOOK="$HOOKDIR/prepare-commit-msg"
mkdir -p "$HOOKDIR"
cat > "$HOOK" <<'EOF'
#!/bin/sh
if test "$2" = commit; then
source=$(git-rev-parse "$3")
else
source=${2-default}
fi
if test "$GIT_EDITOR" = :; then
sed -e "1s/.*/$source (no editor)/" "$1" > msg.tmp
else
sed -e "1s/.*/$source/" "$1" > msg.tmp
fi
mv msg.tmp "$1"
exit 0
EOF
chmod +x "$HOOK"
echo dummy template > "$(git rev-parse --git-dir)/template"
test_expect_success 'with hook (-m)' '
echo "more" >> file &&
git add file &&
git commit -m "more" &&
test "`git log -1 --pretty=format:%s`" = "message (no editor)"
'
test_expect_success 'with hook (-m editor)' '
echo "more" >> file &&
git add file &&
GIT_EDITOR="$FAKE_EDITOR" git commit -e -m "more more" &&
test "`git log -1 --pretty=format:%s`" = message
'
test_expect_success 'with hook (-t)' '
echo "more" >> file &&
git add file &&
git commit -t "$(git rev-parse --git-dir)/template" &&
test "`git log -1 --pretty=format:%s`" = template
'
test_expect_success 'with hook (-F)' '
echo "more" >> file &&
git add file &&
(echo more | git commit -F -) &&
test "`git log -1 --pretty=format:%s`" = "message (no editor)"
'
test_expect_success 'with hook (-F editor)' '
echo "more" >> file &&
git add file &&
(echo more more | GIT_EDITOR="$FAKE_EDITOR" git commit -e -F -) &&
test "`git log -1 --pretty=format:%s`" = message
'
test_expect_success 'with hook (-C)' '
head=`git rev-parse HEAD` &&
echo "more" >> file &&
git add file &&
git commit -C $head &&
test "`git log -1 --pretty=format:%s`" = "$head (no editor)"
'
test_expect_success 'with hook (editor)' '
echo "more more" >> file &&
git add file &&
GIT_EDITOR="$FAKE_EDITOR" git commit &&
test "`git log -1 --pretty=format:%s`" = default
'
test_expect_success 'with hook (--amend)' '
head=`git rev-parse HEAD` &&
echo "more" >> file &&
git add file &&
GIT_EDITOR="$FAKE_EDITOR" git commit --amend &&
test "`git log -1 --pretty=format:%s`" = "$head"
'
test_expect_success 'with hook (-c)' '
head=`git rev-parse HEAD` &&
echo "more" >> file &&
git add file &&
GIT_EDITOR="$FAKE_EDITOR" git commit -c $head &&
test "`git log -1 --pretty=format:%s`" = "$head"
'
cat > "$HOOK" <<'EOF'
#!/bin/sh
exit 1
EOF
test_expect_success 'with failing hook' '
head=`git rev-parse HEAD` &&
echo "more" >> file &&
git add file &&
! GIT_EDITOR="$FAKE_EDITOR" git commit -c $head
'
test_expect_success 'with failing hook (--no-verify)' '
head=`git rev-parse HEAD` &&
echo "more" >> file &&
git add file &&
! GIT_EDITOR="$FAKE_EDITOR" git commit --no-verify -c $head
'
test_done