Merge branch 'pb/prepare-commit-msg'

* pb/prepare-commit-msg:
  git-commit: add a prepare-commit-msg hook
  git-commit: Refactor creation of log message.
  git-commit: set GIT_EDITOR=: if editor will not be launched
  git-commit: support variable number of hook arguments
This commit is contained in:
Junio C Hamano 2008-02-16 17:56:59 -08:00
commit 1ae419cb39
7 changed files with 400 additions and 111 deletions

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@ -280,8 +280,8 @@ order).
HOOKS
-----
This command can run `commit-msg`, `pre-commit`, and
`post-commit` hooks. See link:hooks.html[hooks] for more
This command can run `commit-msg`, `prepare-commit-msg`, `pre-commit`,
and `post-commit` hooks. See link:hooks.html[hooks] for more
information.

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@ -61,6 +61,35 @@ The default 'pre-commit' hook, when enabled, catches introduction
of lines with trailing whitespaces and aborts the commit when
such a line is found.
All the `git-commit` hooks are invoked with the environment
variable `GIT_EDITOR=:` if the command will not bring up an editor
to modify the commit message.
prepare-commit-msg
------------------
This hook is invoked by `git-commit` right after preparing the
default log message, and before the editor is started.
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 (if a `\-c`, `\-C` or `\--amend` option was given).
If the exit status is non-zero, `git-commit` will abort.
The purpose of the hook is to edit the message file in place, and
it is not suppressed by the `\--no-verify` option. A non-zero exit
means a failure of the hook and aborts the commit. It should not
be used as replacement for pre-commit hook.
The sample `prepare-commit-msg` hook that comes with git comments
out the `Conflicts:` part of a merge's commit message.
commit-msg
----------

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@ -347,45 +347,107 @@ static int run_status(FILE *fp, const char *index_file, const char *prefix, int
return s.commitable;
}
static int run_hook(const char *index_file, const char *name, ...)
{
struct child_process hook;
const char *argv[10], *env[2];
char index[PATH_MAX];
va_list args;
int i;
va_start(args, name);
argv[0] = git_path("hooks/%s", name);
i = 0;
do {
if (++i >= ARRAY_SIZE(argv))
die ("run_hook(): too many arguments");
argv[i] = va_arg(args, const char *);
} while (argv[i]);
va_end(args);
snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
env[0] = index;
env[1] = NULL;
if (access(argv[0], X_OK) < 0)
return 0;
memset(&hook, 0, sizeof(hook));
hook.argv = argv;
hook.no_stdin = 1;
hook.stdout_to_stderr = 1;
hook.env = env;
return run_command(&hook);
}
static int is_a_merge(const unsigned char *sha1)
{
struct commit *commit = lookup_commit(sha1);
if (!commit || parse_commit(commit))
die("could not parse HEAD commit");
return !!(commit->parents && commit->parents->next);
}
static const char sign_off_header[] = "Signed-off-by: ";
static int prepare_log_message(const char *index_file, const char *prefix)
static int prepare_to_commit(const char *index_file, const char *prefix)
{
struct stat statbuf;
int commitable, saved_color_setting;
struct strbuf sb;
char *buffer;
FILE *fp;
const char *hook_arg1 = NULL;
const char *hook_arg2 = NULL;
if (!no_verify && run_hook(index_file, "pre-commit", NULL))
return 0;
strbuf_init(&sb, 0);
if (message.len) {
strbuf_addbuf(&sb, &message);
hook_arg1 = "message";
} else if (logfile && !strcmp(logfile, "-")) {
if (isatty(0))
fprintf(stderr, "(reading log message from standard input)\n");
if (strbuf_read(&sb, 0, 0) < 0)
die("could not read log from standard input");
hook_arg1 = "message";
} else if (logfile) {
if (strbuf_read_file(&sb, logfile, 0) < 0)
die("could not read log file '%s': %s",
logfile, strerror(errno));
hook_arg1 = "message";
} else if (use_message) {
buffer = strstr(use_message_buffer, "\n\n");
if (!buffer || buffer[2] == '\0')
die("commit has empty message");
strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
hook_arg1 = "commit";
hook_arg2 = use_message;
} else if (!stat(git_path("MERGE_MSG"), &statbuf)) {
if (strbuf_read_file(&sb, git_path("MERGE_MSG"), 0) < 0)
die("could not read MERGE_MSG: %s", strerror(errno));
hook_arg1 = "merge";
} else if (!stat(git_path("SQUASH_MSG"), &statbuf)) {
if (strbuf_read_file(&sb, git_path("SQUASH_MSG"), 0) < 0)
die("could not read SQUASH_MSG: %s", strerror(errno));
hook_arg1 = "squash";
} else if (template_file && !stat(template_file, &statbuf)) {
if (strbuf_read_file(&sb, template_file, 0) < 0)
die("could not read %s: %s",
template_file, strerror(errno));
hook_arg1 = "template";
}
/*
* This final case does not modify the template message,
* it just sets the argument to the prepare-commit-msg hook.
*/
else if (in_merge)
hook_arg1 = "merge";
fp = fopen(git_path(commit_editmsg), "w");
if (fp == NULL)
die("could not open %s", git_path(commit_editmsg));
@ -417,13 +479,38 @@ static int prepare_log_message(const char *index_file, const char *prefix)
strbuf_release(&sb);
if (!use_editor) {
if (use_editor) {
if (in_merge)
fprintf(fp,
"#\n"
"# It looks like you may be committing a MERGE.\n"
"# If this is not correct, please remove the file\n"
"# %s\n"
"# and try again.\n"
"#\n",
git_path("MERGE_HEAD"));
fprintf(fp,
"\n"
"# Please enter the commit message for your changes.\n"
"# (Comment lines starting with '#' will ");
if (cleanup_mode == CLEANUP_ALL)
fprintf(fp, "not be included)\n");
else /* CLEANUP_SPACE, that is. */
fprintf(fp, "be kept.\n"
"# You can remove them yourself if you want to)\n");
if (only_include_assumed)
fprintf(fp, "# %s\n", only_include_assumed);
saved_color_setting = wt_status_use_color;
wt_status_use_color = 0;
commitable = run_status(fp, index_file, prefix, 1);
wt_status_use_color = saved_color_setting;
} else {
struct rev_info rev;
unsigned char sha1[20];
const char *parent = "HEAD";
fclose(fp);
if (!active_nr && read_cache() < 0)
die("Cannot read index");
@ -431,48 +518,60 @@ static int prepare_log_message(const char *index_file, const char *prefix)
parent = "HEAD^1";
if (get_sha1(parent, sha1))
return !!active_nr;
commitable = !!active_nr;
else {
init_revisions(&rev, "");
rev.abbrev = 0;
setup_revisions(0, NULL, &rev, parent);
DIFF_OPT_SET(&rev.diffopt, QUIET);
DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
run_diff_index(&rev, 1 /* cached */);
init_revisions(&rev, "");
rev.abbrev = 0;
setup_revisions(0, NULL, &rev, parent);
DIFF_OPT_SET(&rev.diffopt, QUIET);
DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
run_diff_index(&rev, 1 /* cached */);
return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
commitable = !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
}
}
if (in_merge)
fprintf(fp,
"#\n"
"# It looks like you may be committing a MERGE.\n"
"# If this is not correct, please remove the file\n"
"# %s\n"
"# and try again.\n"
"#\n",
git_path("MERGE_HEAD"));
fprintf(fp,
"\n"
"# Please enter the commit message for your changes.\n"
"# (Comment lines starting with '#' will ");
if (cleanup_mode == CLEANUP_ALL)
fprintf(fp, "not be included)\n");
else /* CLEANUP_SPACE, that is. */
fprintf(fp, "be kept.\n"
"# You can remove them yourself if you want to)\n");
if (only_include_assumed)
fprintf(fp, "# %s\n", only_include_assumed);
saved_color_setting = wt_status_use_color;
wt_status_use_color = 0;
commitable = run_status(fp, index_file, prefix, 1);
wt_status_use_color = saved_color_setting;
fclose(fp);
return commitable;
if (!commitable && !in_merge && !allow_empty &&
!(amend && is_a_merge(head_sha1))) {
run_status(stdout, index_file, prefix, 0);
unlink(commit_editmsg);
return 0;
}
/*
* Re-read the index as pre-commit hook could have updated it,
* and write it out as a tree. We must do this before we invoke
* the editor and after we invoke run_status above.
*/
discard_cache();
read_cache_from(index_file);
if (!active_cache_tree)
active_cache_tree = cache_tree();
if (cache_tree_update(active_cache_tree,
active_cache, active_nr, 0, 0) < 0) {
error("Error building trees");
return 0;
}
if (run_hook(index_file, "prepare-commit-msg",
git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))
return 0;
if (use_editor) {
char index[PATH_MAX];
const char *env[2] = { index, NULL };
snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
launch_editor(git_path(commit_editmsg), NULL, env);
}
if (!no_verify &&
run_hook(index_file, "commit-msg", git_path(commit_editmsg), NULL)) {
return 0;
}
return 1;
}
/*
@ -569,6 +668,8 @@ static int parse_and_validate_options(int argc, const char *argv[],
use_editor = 0;
if (edit_flag)
use_editor = 1;
if (!use_editor)
setenv("GIT_EDITOR", ":", 1);
if (get_sha1("HEAD", head_sha1))
initial_commit = 1;
@ -681,31 +782,6 @@ int cmd_status(int argc, const char **argv, const char *prefix)
return commitable ? 0 : 1;
}
static int run_hook(const char *index_file, const char *name, const char *arg)
{
struct child_process hook;
const char *argv[3], *env[2];
char index[PATH_MAX];
argv[0] = git_path("hooks/%s", name);
argv[1] = arg;
argv[2] = NULL;
snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
env[0] = index;
env[1] = NULL;
if (access(argv[0], X_OK) < 0)
return 0;
memset(&hook, 0, sizeof(hook));
hook.argv = argv;
hook.no_stdin = 1;
hook.stdout_to_stderr = 1;
hook.env = env;
return run_command(&hook);
}
static void print_summary(const char *prefix, const unsigned char *sha1)
{
struct rev_info rev;
@ -756,14 +832,6 @@ int git_commit_config(const char *k, const char *v)
return git_status_config(k, v);
}
static int is_a_merge(const unsigned char *sha1)
{
struct commit *commit = lookup_commit(sha1);
if (!commit || parse_commit(commit))
die("could not parse HEAD commit");
return !!(commit->parents && commit->parents->next);
}
static const char commit_utf8_warn[] =
"Warning: commit message does not conform to UTF-8.\n"
"You may want to amend it after fixing the message, or set the config\n"
@ -795,33 +863,13 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
index_file = prepare_index(argc, argv, prefix);
if (!no_verify && run_hook(index_file, "pre-commit", NULL)) {
/* Set up everything for writing the commit object. This includes
running hooks, writing the trees, and interacting with the user. */
if (!prepare_to_commit(index_file, prefix)) {
rollback_index_files();
return 1;
}
if (!prepare_log_message(index_file, prefix) && !in_merge &&
!allow_empty && !(amend && is_a_merge(head_sha1))) {
run_status(stdout, index_file, prefix, 0);
rollback_index_files();
unlink(commit_editmsg);
return 1;
}
/*
* Re-read the index as pre-commit hook could have updated it,
* and write it out as a tree.
*/
discard_cache();
read_cache_from(index_file);
if (!active_cache_tree)
active_cache_tree = cache_tree();
if (cache_tree_update(active_cache_tree,
active_cache, active_nr, 0, 0) < 0) {
rollback_index_files();
die("Error building trees");
}
/*
* The commit object
*/
@ -873,19 +921,8 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
strbuf_addf(&sb, "encoding %s\n", git_commit_encoding);
strbuf_addch(&sb, '\n');
/* Get the commit message and validate it */
/* Finally, get the commit message */
header_len = sb.len;
if (use_editor) {
char index[PATH_MAX];
const char *env[2] = { index, NULL };
snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
launch_editor(git_path(commit_editmsg), NULL, env);
}
if (!no_verify &&
run_hook(index_file, "commit-msg", git_path(commit_editmsg))) {
rollback_index_files();
exit(1);
}
if (strbuf_read_file(&sb, git_path(commit_editmsg), 0) < 0) {
rollback_index_files();
die("could not read commit message");

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@ -154,4 +154,33 @@ test_expect_success 'cleanup commit messages (strip,-F,-e)' '
'
pwd=`pwd`
cat >> .git/FAKE_EDITOR << EOF
#! /bin/sh
echo editor started > "$pwd/.git/result"
exit 0
EOF
chmod +x .git/FAKE_EDITOR
test_expect_success 'do not fire editor in the presence of conflicts' '
git clean
echo f>g
git add g
git commit -myes
git branch second
echo master>g
echo g>h
git add g h
git commit -mmaster
git checkout second
echo second>g
git add g
git commit -msecond
git cherry-pick -n master
echo "editor not started" > .git/result
GIT_EDITOR=`pwd`/.git/FAKE_EDITOR git commit && exit 1 # should fail
test "`cat .git/result`" = "editor not started"
'
test_done

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@ -0,0 +1,155 @@
#!/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

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@ -9,6 +9,9 @@
# To enable this hook, make this file executable.
# Uncomment the below to add a Signed-off-by line to the message.
# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
# hook is more suited to it.
#
# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"

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@ -0,0 +1,36 @@
#!/bin/sh
#
# An example hook script to prepare the commit log message.
# Called by git-commit with the name of the file that has the
# commit message, followed by the description of the commit
# message's source. The hook's purpose is to edit the commit
# message file. If the hook fails with a non-zero status,
# the commit is aborted.
#
# To enable this hook, make this file executable.
# This hook includes three examples. The first comments out the
# "Conflicts:" part of a merge commit.
#
# The second includes the output of "git diff --name-status -r"
# into the message, just before the "git status" output. It is
# commented because it doesn't cope with --amend or with squashed
# commits.
#
# The third example adds a Signed-off-by line to the message, that can
# still be edited. This is rarely a good idea.
case "$2 $3" in
merge)
sed -i '/^Conflicts:/,/#/!b;s/^/# &/;s/^# #/#/' "$1" ;;
# ""|template)
# perl -i -pe '
# print "\n" . `git diff --cached --name-status -r`
# if /^#/ && $first++ == 0' "$1" ;;
*) ;;
esac
# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"