[PATCH v4 3/7] revert: add --ff option to allow fast forward when cherry-picking
From: Junio C Hamano <gitster@pobox.com>
As "git merge" fast forwards if possible, it seems sensible to have such a feature for "git cherry-pick" too, especially as it could be used in git-rebase--interactive.sh.
Maybe this option could be made the default in the long run, with another --no-ff option to disable this default behavior, but that could make some scripts backward incompatible and/or that would require testing if some GIT_AUTHOR_* environment variables are set. So we don't do that for now.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
builtin/revert.c | 43 ++++++++++++++++++++++++++++++++++++++++---
1 files changed, 40 insertions(+), 3 deletions(-)
Show changes to builtin/revert.c +40 −3
diff --git a/builtin/revert.c b/builtin/revert.c
index eff5268..476f41e 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -13,6 +13,7 @@
#include "revision.h"
#include "rerere.h"
#include "merge-recursive.h"
+#include "refs.h"
/*
* This implements the builtins revert and cherry-pick.
@@ -35,7 +36,7 @@ static const char * const cherry_pick_usage[] = {
NULL
};
-static int edit, no_replay, no_commit, mainline, signoff;
+static int edit, no_replay, no_commit, mainline, signoff, allow_ff;
static enum { REVERT, CHERRY_PICK } action;
static struct commit *commit;
static const char *commit_name;
@@ -60,8 +61,19 @@ static void parse_args(int argc, const char **argv)
OPT_INTEGER('m', "mainline", &mainline, "parent number"),
OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
OPT_END(),
+ OPT_END(),
+ OPT_END(),
};
+ if (action == CHERRY_PICK) {
+ struct option cp_extra[] = {
+ OPT_BOOLEAN(0, "ff", &allow_ff, "allow fast-forward"),
+ OPT_END(),
+ };
+ if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
+ die("program error");
+ }
+
if (parse_options(argc, argv, NULL, options, usage_str, 0) != 1)
usage_with_options(usage_str, options);
@@ -244,6 +256,17 @@ static NORETURN void die_dirty_index(const char *me)
}
}
+static int fast_forward_to(const unsigned char *to, const unsigned char *from)
+{
+ struct ref_lock *ref_lock;
+
+ read_cache();
+ if (checkout_fast_forward(from, to))
+ exit(1); /* the callee should have complained already */
+ ref_lock = lock_any_ref_for_update("HEAD", from, 0);
+ return write_ref_sha1(ref_lock, to, "cherry-pick");
+}
+
static int revert_or_cherry_pick(int argc, const char **argv)
{
unsigned char head[20];
@@ -265,6 +288,17 @@ static int revert_or_cherry_pick(int argc, const char **argv)
if (action == REVERT && !no_replay)
die("revert is incompatible with replay");
+ if (allow_ff) {
+ if (signoff)
+ die("cherry-pick --ff cannot be used with --signoff");
+ if (no_commit)
+ die("cherry-pick --ff cannot be used with --no-commit");
+ if (no_replay)
+ die("cherry-pick --ff cannot be used with -x");
+ if (edit)
+ die("cherry-pick --ff cannot be used with --edit");
+ }
+
if (read_cache() < 0)
die("git %s: failed to read the index", me);
if (no_commit) {
@@ -284,8 +318,6 @@ static int revert_or_cherry_pick(int argc, const char **argv)
}
discard_cache();
- index_fd = hold_locked_index(&index_lock, 1);
-
if (!commit->parents) {
if (action == REVERT)
die ("Cannot revert a root commit");
@@ -314,6 +346,9 @@ static int revert_or_cherry_pick(int argc, const char **argv)
else
parent = commit->parents->item;
+ if (allow_ff && !hashcmp(parent->object.sha1, head))
+ return fast_forward_to(commit->object.sha1, head);
+
if (!(message = commit->buffer))
die ("Cannot get commit message for %s",
sha1_to_hex(commit->object.sha1));
@@ -343,6 +378,8 @@ static int revert_or_cherry_pick(int argc, const char **argv)
oneline = get_oneline(message);
+ index_fd = hold_locked_index(&index_lock, 1);
+
if (action == REVERT) {
char *oneline_body = strchr(oneline, ' ');
--
1.7.0.1.307.g861f4
Christian Couder
