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builtin rebase: support --root

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This option allows to rebase entire histories up to, and including, the
root commit.

The conversion from the shell script is straight-forward, apart from
the fact that we do not have to write an empty tree in C.

Signed-off-by: Pratik Karki <predatoramigo@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pratik Karki 2018-09-04 15:00:12 -07:00 committed by Junio C Hamano
parent ba1905a5fe
commit 9dba809a69
1 changed files with 29 additions and 2 deletions
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31
builtin/rebase.c
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@ -76,6 +76,7 @@ struct rebase_options {
const char *revisions;
const char *switch_to;
int root;
struct object_id *squash_onto;
struct commit *restrict_revision;
int dont_finish_rebase;
enum {
@ -375,6 +376,9 @@ static int run_specific_rebase(struct rebase_options *opts)
opts->rebase_cousins ? "t" : "");
add_var(&script_snippet, "strategy", opts->strategy);
add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
add_var(&script_snippet, "squash_onto",
opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
switch (opts->type) {
case REBASE_AM:
@ -653,6 +657,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
const char *rebase_merges = NULL;
int fork_point = -1;
struct string_list strategy_options = STRING_LIST_INIT_NODUP;
struct object_id squash_onto;
char *squash_onto_name = NULL;
struct option builtin_rebase_options[] = {
OPT_STRING(0, "onto", &options.onto_name,
N_("revision"),
@ -744,6 +750,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
N_("option"),
N_("pass the argument through to the merge "
"strategy")),
OPT_BOOL(0, "root", &options.root,
N_("rebase all reachable commits up to the root(s)")),
OPT_END(),
};
@ -1021,6 +1029,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
}
}
if (options.root && !options.onto_name)
imply_interactive(&options, "--root without --onto");
switch (options.type) {
case REBASE_MERGE:
case REBASE_INTERACTIVE:
@ -1059,8 +1070,22 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (!options.upstream)
die(_("invalid upstream '%s'"), options.upstream_name);
options.upstream_arg = options.upstream_name;
} else
die("TODO: upstream for --root");
} else {
if (!options.onto_name) {
if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
&squash_onto, NULL, NULL) < 0)
die(_("Could not create new root commit"));
options.squash_onto = &squash_onto;
options.onto_name = squash_onto_name =
xstrdup(oid_to_hex(&squash_onto));
}
options.upstream_name = NULL;
options.upstream = NULL;
if (argc > 1)
usage_with_options(builtin_rebase_usage,
builtin_rebase_options);
options.upstream_arg = "--root";
}
/* Make sure the branch to rebase onto is valid. */
if (!options.onto_name)
@ -1208,6 +1233,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
*/
if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
!is_interactive(&options) && !options.restrict_revision &&
options.upstream &&
!oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
int flag;
@ -1312,5 +1338,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
free(options.head_name);
free(options.gpg_sign_opt);
free(options.cmd);
free(squash_onto_name);
return ret;
}