In particular on Windows, where shell scripts are even more expensive
than on MacOSX or Linux, it makes sense to move a loop that forks
Git at least once for every line in the todo list into a builtin.
Note: The original code did not try to skip unnecessary picks of root
commits but punts instead (probably --root was not considered common
enough of a use case to bother optimizing). We do the same, for now.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
builtin/rebase--helper.c | 6 +++-
git-rebase--interactive.sh | 41 ++-------------------
sequencer.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++
sequencer.h | 1 +
4 files changed, 99 insertions(+), 39 deletions(-)
diff --git a/builtin/rebase--helper.c b/builtin/rebase--helper.c
index e706eac710d..de3ccd9bfbc 100644
--- a/builtin/rebase--helper.c
+++ b/builtin/rebase--helper.c
@@ -14,7 +14,7 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
int keep_empty = 0;
enum {
CONTINUE = 1, ABORT, MAKE_SCRIPT, SHORTEN_SHA1S, EXPAND_SHA1S,
- CHECK_TODO_LIST
+ CHECK_TODO_LIST, SKIP_UNNECESSARY_PICKS
} command = 0;
struct option options[] = {
OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
@@ -31,6 +31,8 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
N_("expand SHA-1s in the todo list"), EXPAND_SHA1S),
OPT_CMDMODE(0, "check-todo-list", &command,
N_("check the todo list"), CHECK_TODO_LIST),
+ OPT_CMDMODE(0, "skip-unnecessary-picks", &command,
+ N_("skip unnecessary picks"), SKIP_UNNECESSARY_PICKS),
OPT_END()
};
@@ -55,5 +57,7 @@ int cmd_rebase__helper(int argc, const char **argv, const char *prefix)
return !!transform_todo_ids(0);
if (command == CHECK_TODO_LIST && argc == 1)
return !!check_todo_list();
+ if (command == SKIP_UNNECESSARY_PICKS && argc == 1)
+ return !!skip_unnecessary_picks();
usage_with_options(builtin_rebase_helper_usage, options);
}
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 1649506e1e4..931bc09e0cf 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -713,43 +713,6 @@ do_rest () {
done
}
-# skip picking commits whose parents are unchanged
-skip_unnecessary_picks () {
- fd=3
- while read -r command rest
- do
- # fd=3 means we skip the command
- case "$fd,$command" in
- 3,pick|3,p)
- # pick a commit whose parent is current $onto -> skip
- sha1=${rest%% *}
- case "$(git rev-parse --verify --quiet "$sha1"^)" in
- "$onto"*)
- onto=$sha1
- ;;
- *)
- fd=1
- ;;
- esac
- ;;
- 3,"$comment_char"*|3,)
- # copy comments
- ;;
- *)
- fd=1
- ;;
- esac
- printf '%s\n' "$command${rest:+ }$rest" >&$fd
- done <"$todo" >"$todo.new" 3>>"$done" &&
- mv -f "$todo".new "$todo" &&
- case "$(peek_next_command)" in
- squash|s|fixup|f)
- record_in_rewritten "$onto"
- ;;
- esac ||
- die "$(gettext "Could not skip unnecessary pick commands")"
-}
-
transform_todo_ids () {
while read -r command rest
do
@@ -1172,7 +1135,9 @@ git rebase--helper --check-todo-list || {
expand_todo_ids
-test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
+test -d "$rewritten" || test -n "$force_rebase" ||
+onto="$(git rebase--helper --skip-unnecessary-picks)" ||
+die "Could not skip unnecessary pick commands"
checkout_onto
if test -z "$rebase_root" && test ! -d "$rewritten"
diff --git a/sequencer.c b/sequencer.c
index 3a935fa4cbc..bbbc98c9116 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2616,3 +2616,93 @@ int check_todo_list(void)
return res;
}
+
+/* skip picking commits whose parents are unchanged */
+int skip_unnecessary_picks(void)
+{
+ const char *todo_file = rebase_path_todo();
+ struct strbuf buf = STRBUF_INIT;
+ struct todo_list todo_list = TODO_LIST_INIT;
+ struct object_id onto_oid, *oid = &onto_oid, *parent_oid;
+ int fd, i;
+
+ if (!read_oneliner(&buf, rebase_path_onto(), 0))
+ return error(_("could not read 'onto'"));
+ if (get_sha1(buf.buf, onto_oid.hash)) {
+ strbuf_release(&buf);
+ return error(_("need a HEAD to fixup"));
+ }
+ strbuf_release(&buf);
+
+ fd = open(todo_file, O_RDONLY);
+ if (fd < 0) {
+ return error_errno(_("could not open '%s'"), todo_file);
+ }
+ if (strbuf_read(&todo_list.buf, fd, 0) < 0) {
+ close(fd);
+ return error(_("could not read '%s'."), todo_file);
+ }
+ close(fd);
+ if (parse_insn_buffer(todo_list.buf.buf, &todo_list) < 0) {
+ todo_list_release(&todo_list);
+ return -1;
+ }
+
+ for (i = 0; i < todo_list.nr; i++) {
+ struct todo_item *item = todo_list.items + i;
+
+ if (item->command >= TODO_NOOP)
+ continue;
+ if (item->command != TODO_PICK)
+ break;
+ if (parse_commit(item->commit)) {
+ todo_list_release(&todo_list);
+ return error(_("could not parse commit '%s'"),
+ oid_to_hex(&item->commit->object.oid));
+ }
+ if (!item->commit->parents)
+ break; /* root commit */
+ if (item->commit->parents->next)
+ break; /* merge commit */
+ parent_oid = &item->commit->parents->item->object.oid;
+ if (hashcmp(parent_oid->hash, oid->hash))
+ break;
+ oid = &item->commit->object.oid;
+ }
+ if (i > 0) {
+ int offset = i < todo_list.nr ?
+ todo_list.items[i].offset_in_buf : todo_list.buf.len;
+ const char *done_path = rebase_path_done();
+
+ fd = open(done_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
+ if (write_in_full(fd, todo_list.buf.buf, offset) < 0) {
+ todo_list_release(&todo_list);
+ return error_errno(_("could not write to '%s'"),
+ done_path);
+ }
+ close(fd);
+
+ fd = open(rebase_path_todo(), O_WRONLY, 0666);
+ if (write_in_full(fd, todo_list.buf.buf + offset,
+ todo_list.buf.len - offset) < 0) {
+ todo_list_release(&todo_list);
+ return error_errno(_("could not write to '%s'"),
+ rebase_path_todo());
+ }
+ if (ftruncate(fd, todo_list.buf.len - offset) < 0) {
+ todo_list_release(&todo_list);
+ return error_errno(_("could not truncate '%s'"),
+ rebase_path_todo());
+ }
+ close(fd);
+
+ todo_list.current = i;
+ if (is_fixup(peek_command(&todo_list, 0)))
+ record_in_rewritten(oid, peek_command(&todo_list, 0));
+ }
+
+ todo_list_release(&todo_list);
+ printf("%s\n", oid_to_hex(oid));
+
+ return 0;
+}
diff --git a/sequencer.h b/sequencer.h
index 4978a61b83b..28e1fc1e9bb 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -50,6 +50,7 @@ int sequencer_make_script(int keep_empty, FILE *out,
int transform_todo_ids(int shorten_sha1s);
int check_todo_list(void);
+int skip_unnecessary_picks(void);
extern const char sign_off_header[];
--
2.12.2.windows.2.406.gd14a8f8640f