#include "revision.h"
#include "rerere.h"
#include "merge-recursive.h"
+#include "refs.h"
/*
* This implements the builtins revert and cherry-pick.
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;
static int allow_rerere_auto;
static const char *me;
+static const char *strategy;
#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
+static char *get_encoding(const char *message);
+
static void parse_args(int argc, const char **argv)
{
const char * const * usage_str =
OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
OPT_INTEGER('m', "mainline", &mainline, "parent number"),
OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
+ OPT_STRING(0, "strategy", &strategy, "strategy", "merge strategy"),
+ 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);
exit(1);
}
-static char *get_oneline(const char *message)
+struct commit_message {
+ char *parent_label;
+ const char *label;
+ const char *subject;
+ char *reencoded_message;
+ const char *message;
+};
+
+static int get_message(const char *raw_message, struct commit_message *out)
{
- char *result;
- const char *p = message, *abbrev, *eol;
+ const char *encoding;
+ const char *p, *abbrev, *eol;
+ char *q;
int abbrev_len, oneline_len;
- if (!p)
- die ("Could not read commit message of %s",
- sha1_to_hex(commit->object.sha1));
+ if (!raw_message)
+ return -1;
+ encoding = get_encoding(raw_message);
+ if (!encoding)
+ encoding = "UTF-8";
+ if (!git_commit_encoding)
+ git_commit_encoding = "UTF-8";
+
+ out->reencoded_message = NULL;
+ out->message = raw_message;
+ if (strcmp(encoding, git_commit_encoding))
+ out->reencoded_message = reencode_string(raw_message,
+ git_commit_encoding, encoding);
+ if (out->reencoded_message)
+ out->message = out->reencoded_message;
+
+ abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
+ abbrev_len = strlen(abbrev);
+
+ /* Find beginning and end of commit subject. */
+ p = out->message;
while (*p && (*p != '\n' || p[1] != '\n'))
p++;
-
if (*p) {
p += 2;
for (eol = p + 1; *eol && *eol != '\n'; eol++)
; /* do nothing */
} else
eol = p;
- abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
- abbrev_len = strlen(abbrev);
oneline_len = eol - p;
- result = xmalloc(abbrev_len + 5 + oneline_len);
- memcpy(result, abbrev, abbrev_len);
- memcpy(result + abbrev_len, "... ", 4);
- memcpy(result + abbrev_len + 4, p, oneline_len);
- result[abbrev_len + 4 + oneline_len] = '\0';
- return result;
+
+ out->parent_label = xmalloc(strlen("parent of ") + abbrev_len +
+ strlen("... ") + oneline_len + 1);
+ q = out->parent_label;
+ q = mempcpy(q, "parent of ", strlen("parent of "));
+ out->label = q;
+ q = mempcpy(q, abbrev, abbrev_len);
+ q = mempcpy(q, "... ", strlen("... "));
+ out->subject = q;
+ q = mempcpy(q, p, oneline_len);
+ *q = '\0';
+ return 0;
+}
+
+static void free_message(struct commit_message *msg)
+{
+ free(msg->parent_label);
+ free(msg->reencoded_message);
}
static char *get_encoding(const char *message)
return NULL;
}
-static struct lock_file msg_file;
-static int msg_fd;
-
-static void add_to_msg(const char *string)
-{
- int len = strlen(string);
- if (write_in_full(msg_fd, string, len) < 0)
- die_errno ("Could not write to MERGE_MSG");
-}
-
-static void add_message_to_msg(const char *message)
+static void add_message_to_msg(struct strbuf *msgbuf, const char *message)
{
const char *p = message;
while (*p && (*p != '\n' || p[1] != '\n'))
p++;
if (!*p)
- add_to_msg(sha1_to_hex(commit->object.sha1));
+ strbuf_addstr(msgbuf, sha1_to_hex(commit->object.sha1));
p += 2;
- add_to_msg(p);
- return;
+ strbuf_addstr(msgbuf, p);
}
static void set_author_ident_env(const char *message)
return strbuf_detach(&helpbuf, NULL);
}
+static void write_message(struct strbuf *msgbuf, const char *filename)
+{
+ static struct lock_file msg_file;
+
+ int msg_fd = hold_lock_file_for_update(&msg_file, filename,
+ LOCK_DIE_ON_ERROR);
+ if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0)
+ die_errno("Could not write to %s.", filename);
+ strbuf_release(msgbuf);
+ if (commit_lock_file(&msg_file) < 0)
+ die("Error wrapping up %s", filename);
+}
+
static struct tree *empty_tree(void)
{
struct tree *tree = xcalloc(1, sizeof(struct tree));
}
}
-static int revert_or_cherry_pick(int argc, const char **argv)
+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 void do_recursive_merge(struct commit *base, struct commit *next,
+ const char *base_label, const char *next_label,
+ unsigned char *head, struct strbuf *msgbuf,
+ char *defmsg)
{
- unsigned char head[20];
- struct commit *base, *next, *parent;
- int i, index_fd, clean;
- char *oneline, *reencoded_message = NULL;
- const char *message, *encoding;
- char *defmsg = git_pathdup("MERGE_MSG");
struct merge_options o;
struct tree *result, *next_tree, *base_tree, *head_tree;
+ int clean, index_fd;
static struct lock_file index_lock;
+ index_fd = hold_locked_index(&index_lock, 1);
+
+ read_cache();
+ init_merge_options(&o);
+ o.ancestor = base ? base_label : "(empty tree)";
+ o.branch1 = "HEAD";
+ o.branch2 = next ? next_label : "(empty tree)";
+
+ head_tree = parse_tree_indirect(head);
+ next_tree = next ? next->tree : empty_tree();
+ base_tree = base ? base->tree : empty_tree();
+
+ clean = merge_trees(&o,
+ head_tree,
+ next_tree, base_tree, &result);
+
+ if (active_cache_changed &&
+ (write_cache(index_fd, active_cache, active_nr) ||
+ commit_locked_index(&index_lock)))
+ die("%s: Unable to write new index file", me);
+ rollback_lock_file(&index_lock);
+
+ if (!clean) {
+ int i;
+ strbuf_addstr(msgbuf, "\nConflicts:\n\n");
+ for (i = 0; i < active_nr;) {
+ struct cache_entry *ce = active_cache[i++];
+ if (ce_stage(ce)) {
+ strbuf_addch(msgbuf, '\t');
+ strbuf_addstr(msgbuf, ce->name);
+ strbuf_addch(msgbuf, '\n');
+ while (i < active_nr && !strcmp(ce->name,
+ active_cache[i]->name))
+ i++;
+ }
+ }
+ write_message(msgbuf, defmsg);
+ fprintf(stderr, "Automatic %s failed.%s\n",
+ me, help_msg(commit_name));
+ rerere(allow_rerere_auto);
+ exit(1);
+ }
+ write_message(msgbuf, defmsg);
+ fprintf(stderr, "Finished one %s.\n", me);
+}
+
+static int revert_or_cherry_pick(int argc, const char **argv)
+{
+ unsigned char head[20];
+ struct commit *base, *next, *parent;
+ const char *base_label, *next_label;
+ struct commit_message msg = { NULL, NULL, NULL, NULL, NULL };
+ char *defmsg = NULL;
+ struct strbuf msgbuf = STRBUF_INIT;
+
git_config(git_default_config, NULL);
me = action == REVERT ? "revert" : "cherry-pick";
setenv(GIT_REFLOG_ACTION, me, 0);
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) {
}
discard_cache();
- index_fd = hold_locked_index(&index_lock, 1);
-
if (!commit->parents) {
if (action == REVERT)
die ("Cannot revert a root commit");
else
parent = commit->parents->item;
- if (!(message = commit->buffer))
- die ("Cannot get commit message for %s",
- sha1_to_hex(commit->object.sha1));
+ if (allow_ff && !hashcmp(parent->object.sha1, head))
+ return fast_forward_to(commit->object.sha1, head);
if (parent && parse_commit(parent) < 0)
die("%s: cannot parse parent commit %s",
me, sha1_to_hex(parent->object.sha1));
+ if (get_message(commit->buffer, &msg) != 0)
+ die("Cannot get commit message for %s",
+ sha1_to_hex(commit->object.sha1));
+
/*
* "commit" is an existing commit. We would want to apply
* the difference it introduces since its first parent "prev"
* reverse of it if we are revert.
*/
- msg_fd = hold_lock_file_for_update(&msg_file, defmsg,
- LOCK_DIE_ON_ERROR);
-
- encoding = get_encoding(message);
- if (!encoding)
- encoding = "UTF-8";
- if (!git_commit_encoding)
- git_commit_encoding = "UTF-8";
- if ((reencoded_message = reencode_string(message,
- git_commit_encoding, encoding)))
- message = reencoded_message;
-
- oneline = get_oneline(message);
+ defmsg = git_pathdup("MERGE_MSG");
if (action == REVERT) {
- char *oneline_body = strchr(oneline, ' ');
-
base = commit;
+ base_label = msg.label;
next = parent;
- add_to_msg("Revert \"");
- add_to_msg(oneline_body + 1);
- add_to_msg("\"\n\nThis reverts commit ");
- add_to_msg(sha1_to_hex(commit->object.sha1));
+ next_label = msg.parent_label;
+ strbuf_addstr(&msgbuf, "Revert \"");
+ strbuf_addstr(&msgbuf, msg.subject);
+ strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
+ strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
if (commit->parents->next) {
- add_to_msg(", reversing\nchanges made to ");
- add_to_msg(sha1_to_hex(parent->object.sha1));
+ strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
+ strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
}
- add_to_msg(".\n");
+ strbuf_addstr(&msgbuf, ".\n");
} else {
base = parent;
+ base_label = msg.parent_label;
next = commit;
- set_author_ident_env(message);
- add_message_to_msg(message);
+ next_label = msg.label;
+ set_author_ident_env(msg.message);
+ add_message_to_msg(&msgbuf, msg.message);
if (no_replay) {
- add_to_msg("(cherry picked from commit ");
- add_to_msg(sha1_to_hex(commit->object.sha1));
- add_to_msg(")\n");
+ strbuf_addstr(&msgbuf, "(cherry picked from commit ");
+ strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
+ strbuf_addstr(&msgbuf, ")\n");
}
}
- read_cache();
- init_merge_options(&o);
- o.branch1 = "HEAD";
- o.branch2 = oneline;
-
- head_tree = parse_tree_indirect(head);
- next_tree = next ? next->tree : empty_tree();
- base_tree = base ? base->tree : empty_tree();
-
- clean = merge_trees(&o,
- head_tree,
- next_tree, base_tree, &result);
-
- if (active_cache_changed &&
- (write_cache(index_fd, active_cache, active_nr) ||
- commit_locked_index(&index_lock)))
- die("%s: Unable to write new index file", me);
- rollback_lock_file(&index_lock);
-
- if (!clean) {
- add_to_msg("\nConflicts:\n\n");
- for (i = 0; i < active_nr;) {
- struct cache_entry *ce = active_cache[i++];
- if (ce_stage(ce)) {
- add_to_msg("\t");
- add_to_msg(ce->name);
- add_to_msg("\n");
- while (i < active_nr && !strcmp(ce->name,
- active_cache[i]->name))
- i++;
- }
+ if (!strategy || !strcmp(strategy, "recursive") || action == REVERT)
+ do_recursive_merge(base, next, base_label, next_label,
+ head, &msgbuf, defmsg);
+ else {
+ int res;
+ struct commit_list *common = NULL;
+ struct commit_list *remotes = NULL;
+ write_message(&msgbuf, defmsg);
+ commit_list_insert(base, &common);
+ commit_list_insert(next, &remotes);
+ res = try_merge_command(strategy, common,
+ sha1_to_hex(head), remotes);
+ free_commit_list(common);
+ free_commit_list(remotes);
+ if (res) {
+ fprintf(stderr, "Automatic %s with strategy %s failed.%s\n",
+ me, strategy, help_msg(commit_name));
+ rerere(allow_rerere_auto);
+ exit(1);
}
- if (commit_lock_file(&msg_file) < 0)
- die ("Error wrapping up %s", defmsg);
- fprintf(stderr, "Automatic %s failed.%s\n",
- me, help_msg(commit_name));
- rerere(allow_rerere_auto);
- exit(1);
}
- if (commit_lock_file(&msg_file) < 0)
- die ("Error wrapping up %s", defmsg);
- fprintf(stderr, "Finished one %s.\n", me);
/*
*
args[i] = NULL;
return execv_git_cmd(args);
}
- free(reencoded_message);
+ free_message(&msg);
free(defmsg);
return 0;