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fad2652673
Although it is probably an uncommon operation, there is no reason to disallow it, as it works just fine. It is the reverse of a cherry-pick of a root commit, which is already allowed. We do have to tweak one check on whether we have a merge commit, which assumed we had at least one parent. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
605 lines
16 KiB
C
605 lines
16 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "object.h"
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#include "commit.h"
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#include "tag.h"
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#include "run-command.h"
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#include "exec_cmd.h"
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#include "utf8.h"
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#include "parse-options.h"
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#include "cache-tree.h"
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#include "diff.h"
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#include "revision.h"
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#include "rerere.h"
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#include "merge-recursive.h"
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#include "refs.h"
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/*
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* This implements the builtins revert and cherry-pick.
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*
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* Copyright (c) 2007 Johannes E. Schindelin
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*
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* Based on git-revert.sh, which is
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*
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* Copyright (c) 2005 Linus Torvalds
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* Copyright (c) 2005 Junio C Hamano
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*/
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static const char * const revert_usage[] = {
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"git revert [options] <commit-ish>",
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NULL
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};
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static const char * const cherry_pick_usage[] = {
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"git cherry-pick [options] <commit-ish>",
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NULL
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};
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static int edit, no_replay, no_commit, mainline, signoff, allow_ff;
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static enum { REVERT, CHERRY_PICK } action;
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static struct commit *commit;
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static int commit_argc;
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static const char **commit_argv;
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static int allow_rerere_auto;
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static const char *me;
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/* Merge strategy. */
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static const char *strategy;
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static const char **xopts;
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static size_t xopts_nr, xopts_alloc;
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#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
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static char *get_encoding(const char *message);
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static const char * const *revert_or_cherry_pick_usage(void)
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{
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return action == REVERT ? revert_usage : cherry_pick_usage;
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}
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static int option_parse_x(const struct option *opt,
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const char *arg, int unset)
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{
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if (unset)
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return 0;
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ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
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xopts[xopts_nr++] = xstrdup(arg);
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return 0;
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}
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static void parse_args(int argc, const char **argv)
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{
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const char * const * usage_str = revert_or_cherry_pick_usage();
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int noop;
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struct option options[] = {
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OPT_BOOLEAN('n', "no-commit", &no_commit, "don't automatically commit"),
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OPT_BOOLEAN('e', "edit", &edit, "edit the commit message"),
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{ OPTION_BOOLEAN, 'r', NULL, &noop, NULL, "no-op (backward compatibility)",
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PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 0 },
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OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
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OPT_INTEGER('m', "mainline", &mainline, "parent number"),
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OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
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OPT_STRING(0, "strategy", &strategy, "strategy", "merge strategy"),
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OPT_CALLBACK('X', "strategy-option", &xopts, "option",
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"option for merge strategy", option_parse_x),
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OPT_END(),
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OPT_END(),
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OPT_END(),
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};
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if (action == CHERRY_PICK) {
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struct option cp_extra[] = {
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OPT_BOOLEAN('x', NULL, &no_replay, "append commit name"),
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OPT_BOOLEAN(0, "ff", &allow_ff, "allow fast-forward"),
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OPT_END(),
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};
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if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
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die(_("program error"));
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}
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commit_argc = parse_options(argc, argv, NULL, options, usage_str,
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PARSE_OPT_KEEP_ARGV0 |
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PARSE_OPT_KEEP_UNKNOWN);
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if (commit_argc < 2)
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usage_with_options(usage_str, options);
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commit_argv = argv;
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}
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struct commit_message {
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char *parent_label;
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const char *label;
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const char *subject;
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char *reencoded_message;
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const char *message;
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};
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static int get_message(const char *raw_message, struct commit_message *out)
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{
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const char *encoding;
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const char *abbrev, *subject;
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int abbrev_len, subject_len;
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char *q;
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if (!raw_message)
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return -1;
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encoding = get_encoding(raw_message);
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if (!encoding)
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encoding = "UTF-8";
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if (!git_commit_encoding)
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git_commit_encoding = "UTF-8";
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out->reencoded_message = NULL;
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out->message = raw_message;
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if (strcmp(encoding, git_commit_encoding))
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out->reencoded_message = reencode_string(raw_message,
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git_commit_encoding, encoding);
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if (out->reencoded_message)
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out->message = out->reencoded_message;
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abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
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abbrev_len = strlen(abbrev);
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subject_len = find_commit_subject(out->message, &subject);
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out->parent_label = xmalloc(strlen("parent of ") + abbrev_len +
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strlen("... ") + subject_len + 1);
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q = out->parent_label;
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q = mempcpy(q, "parent of ", strlen("parent of "));
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out->label = q;
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q = mempcpy(q, abbrev, abbrev_len);
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q = mempcpy(q, "... ", strlen("... "));
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out->subject = q;
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q = mempcpy(q, subject, subject_len);
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*q = '\0';
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return 0;
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}
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static void free_message(struct commit_message *msg)
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{
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free(msg->parent_label);
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free(msg->reencoded_message);
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}
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static char *get_encoding(const char *message)
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{
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const char *p = message, *eol;
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if (!p)
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die (_("Could not read commit message of %s"),
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sha1_to_hex(commit->object.sha1));
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while (*p && *p != '\n') {
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for (eol = p + 1; *eol && *eol != '\n'; eol++)
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; /* do nothing */
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if (!prefixcmp(p, "encoding ")) {
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char *result = xmalloc(eol - 8 - p);
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strlcpy(result, p + 9, eol - 8 - p);
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return result;
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}
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p = eol;
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if (*p == '\n')
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p++;
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}
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return NULL;
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}
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static void add_message_to_msg(struct strbuf *msgbuf, const char *message)
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{
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const char *p = message;
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while (*p && (*p != '\n' || p[1] != '\n'))
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p++;
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if (!*p)
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strbuf_addstr(msgbuf, sha1_to_hex(commit->object.sha1));
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p += 2;
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strbuf_addstr(msgbuf, p);
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}
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static void write_cherry_pick_head(void)
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{
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int fd;
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struct strbuf buf = STRBUF_INIT;
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strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1));
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fd = open(git_path("CHERRY_PICK_HEAD"), O_WRONLY | O_CREAT, 0666);
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if (fd < 0)
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die_errno(_("Could not open '%s' for writing"),
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git_path("CHERRY_PICK_HEAD"));
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if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd))
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die_errno(_("Could not write to '%s'"), git_path("CHERRY_PICK_HEAD"));
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strbuf_release(&buf);
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}
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static void advise(const char *advice, ...)
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{
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va_list params;
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va_start(params, advice);
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vreportf("hint: ", advice, params);
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va_end(params);
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}
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static void print_advice(void)
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{
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char *msg = getenv("GIT_CHERRY_PICK_HELP");
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if (msg) {
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fprintf(stderr, "%s\n", msg);
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/*
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* A conflict has occured but the porcelain
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* (typically rebase --interactive) wants to take care
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* of the commit itself so remove CHERRY_PICK_HEAD
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*/
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unlink(git_path("CHERRY_PICK_HEAD"));
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return;
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}
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advise("after resolving the conflicts, mark the corrected paths");
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advise("with 'git add <paths>' or 'git rm <paths>'");
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advise("and commit the result with 'git commit'");
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}
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static void write_message(struct strbuf *msgbuf, const char *filename)
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{
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static struct lock_file msg_file;
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int msg_fd = hold_lock_file_for_update(&msg_file, filename,
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LOCK_DIE_ON_ERROR);
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if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0)
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die_errno(_("Could not write to %s."), filename);
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strbuf_release(msgbuf);
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if (commit_lock_file(&msg_file) < 0)
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die(_("Error wrapping up %s"), filename);
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}
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static struct tree *empty_tree(void)
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{
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struct tree *tree = xcalloc(1, sizeof(struct tree));
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tree->object.parsed = 1;
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tree->object.type = OBJ_TREE;
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pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
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return tree;
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}
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static NORETURN void die_dirty_index(const char *me)
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{
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if (read_cache_unmerged()) {
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die_resolve_conflict(me);
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} else {
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if (advice_commit_before_merge) {
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if (action == REVERT)
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die(_("Your local changes would be overwritten by revert.\n"
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"Please, commit your changes or stash them to proceed."));
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else
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die(_("Your local changes would be overwritten by cherry-pick.\n"
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"Please, commit your changes or stash them to proceed."));
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} else {
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if (action == REVERT)
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die(_("Your local changes would be overwritten by revert.\n"));
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else
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die(_("Your local changes would be overwritten by cherry-pick.\n"));
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}
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}
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}
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static int fast_forward_to(const unsigned char *to, const unsigned char *from)
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{
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struct ref_lock *ref_lock;
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read_cache();
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if (checkout_fast_forward(from, to))
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exit(1); /* the callee should have complained already */
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ref_lock = lock_any_ref_for_update("HEAD", from, 0);
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return write_ref_sha1(ref_lock, to, "cherry-pick");
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}
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static int do_recursive_merge(struct commit *base, struct commit *next,
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const char *base_label, const char *next_label,
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unsigned char *head, struct strbuf *msgbuf)
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{
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struct merge_options o;
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struct tree *result, *next_tree, *base_tree, *head_tree;
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int clean, index_fd;
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const char **xopt;
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static struct lock_file index_lock;
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index_fd = hold_locked_index(&index_lock, 1);
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read_cache();
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init_merge_options(&o);
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o.ancestor = base ? base_label : "(empty tree)";
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o.branch1 = "HEAD";
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o.branch2 = next ? next_label : "(empty tree)";
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head_tree = parse_tree_indirect(head);
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next_tree = next ? next->tree : empty_tree();
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base_tree = base ? base->tree : empty_tree();
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for (xopt = xopts; xopt != xopts + xopts_nr; xopt++)
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parse_merge_opt(&o, *xopt);
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clean = merge_trees(&o,
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head_tree,
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next_tree, base_tree, &result);
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if (active_cache_changed &&
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(write_cache(index_fd, active_cache, active_nr) ||
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commit_locked_index(&index_lock)))
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/* TRANSLATORS: %s will be "revert" or "cherry-pick" */
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die(_("%s: Unable to write new index file"), me);
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rollback_lock_file(&index_lock);
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if (!clean) {
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int i;
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strbuf_addstr(msgbuf, "\nConflicts:\n\n");
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for (i = 0; i < active_nr;) {
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struct cache_entry *ce = active_cache[i++];
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if (ce_stage(ce)) {
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strbuf_addch(msgbuf, '\t');
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strbuf_addstr(msgbuf, ce->name);
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strbuf_addch(msgbuf, '\n');
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while (i < active_nr && !strcmp(ce->name,
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active_cache[i]->name))
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i++;
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}
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}
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}
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return !clean;
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}
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/*
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* If we are cherry-pick, and if the merge did not result in
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* hand-editing, we will hit this commit and inherit the original
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* author date and name.
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* If we are revert, or if our cherry-pick results in a hand merge,
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* we had better say that the current user is responsible for that.
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*/
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static int run_git_commit(const char *defmsg)
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{
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/* 6 is max possible length of our args array including NULL */
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const char *args[6];
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int i = 0;
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args[i++] = "commit";
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args[i++] = "-n";
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if (signoff)
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args[i++] = "-s";
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if (!edit) {
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args[i++] = "-F";
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args[i++] = defmsg;
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}
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args[i] = NULL;
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return run_command_v_opt(args, RUN_GIT_CMD);
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}
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static int do_pick_commit(void)
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{
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unsigned char head[20];
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struct commit *base, *next, *parent;
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const char *base_label, *next_label;
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struct commit_message msg = { NULL, NULL, NULL, NULL, NULL };
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char *defmsg = NULL;
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struct strbuf msgbuf = STRBUF_INIT;
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int res;
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if (no_commit) {
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/*
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* We do not intend to commit immediately. We just want to
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* merge the differences in, so let's compute the tree
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* that represents the "current" state for merge-recursive
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* to work on.
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*/
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if (write_cache_as_tree(head, 0, NULL))
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die (_("Your index file is unmerged."));
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} else {
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if (get_sha1("HEAD", head))
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die (_("You do not have a valid HEAD"));
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if (index_differs_from("HEAD", 0))
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die_dirty_index(me);
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}
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discard_cache();
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if (!commit->parents) {
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parent = NULL;
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}
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else if (commit->parents->next) {
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/* Reverting or cherry-picking a merge commit */
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int cnt;
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struct commit_list *p;
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if (!mainline)
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die(_("Commit %s is a merge but no -m option was given."),
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sha1_to_hex(commit->object.sha1));
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for (cnt = 1, p = commit->parents;
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cnt != mainline && p;
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cnt++)
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p = p->next;
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if (cnt != mainline || !p)
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die(_("Commit %s does not have parent %d"),
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sha1_to_hex(commit->object.sha1), mainline);
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parent = p->item;
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} else if (0 < mainline)
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die(_("Mainline was specified but commit %s is not a merge."),
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sha1_to_hex(commit->object.sha1));
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else
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parent = commit->parents->item;
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if (allow_ff && parent && !hashcmp(parent->object.sha1, head))
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return fast_forward_to(commit->object.sha1, head);
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if (parent && parse_commit(parent) < 0)
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/* TRANSLATORS: The first %s will be "revert" or
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"cherry-pick", the second %s a SHA1 */
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die(_("%s: cannot parse parent commit %s"),
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me, sha1_to_hex(parent->object.sha1));
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if (get_message(commit->buffer, &msg) != 0)
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die(_("Cannot get commit message for %s"),
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sha1_to_hex(commit->object.sha1));
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/*
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* "commit" is an existing commit. We would want to apply
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* the difference it introduces since its first parent "prev"
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* on top of the current HEAD if we are cherry-pick. Or the
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* reverse of it if we are revert.
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*/
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defmsg = git_pathdup("MERGE_MSG");
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if (action == REVERT) {
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base = commit;
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base_label = msg.label;
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next = parent;
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next_label = msg.parent_label;
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strbuf_addstr(&msgbuf, "Revert \"");
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strbuf_addstr(&msgbuf, msg.subject);
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strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
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strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
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if (commit->parents && commit->parents->next) {
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strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
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strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
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}
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strbuf_addstr(&msgbuf, ".\n");
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} else {
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base = parent;
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base_label = msg.parent_label;
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next = commit;
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next_label = msg.label;
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add_message_to_msg(&msgbuf, msg.message);
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if (no_replay) {
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strbuf_addstr(&msgbuf, "(cherry picked from commit ");
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strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
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strbuf_addstr(&msgbuf, ")\n");
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}
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if (!no_commit)
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write_cherry_pick_head();
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}
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if (!strategy || !strcmp(strategy, "recursive") || action == REVERT) {
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res = do_recursive_merge(base, next, base_label, next_label,
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head, &msgbuf);
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write_message(&msgbuf, defmsg);
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} else {
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struct commit_list *common = NULL;
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struct commit_list *remotes = NULL;
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write_message(&msgbuf, defmsg);
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commit_list_insert(base, &common);
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commit_list_insert(next, &remotes);
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res = try_merge_command(strategy, xopts_nr, xopts, common,
|
|
sha1_to_hex(head), remotes);
|
|
free_commit_list(common);
|
|
free_commit_list(remotes);
|
|
}
|
|
|
|
if (res) {
|
|
error(action == REVERT
|
|
? _("could not revert %s... %s")
|
|
: _("could not apply %s... %s"),
|
|
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
|
|
msg.subject);
|
|
print_advice();
|
|
rerere(allow_rerere_auto);
|
|
} else {
|
|
if (!no_commit)
|
|
res = run_git_commit(defmsg);
|
|
}
|
|
|
|
free_message(&msg);
|
|
free(defmsg);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void prepare_revs(struct rev_info *revs)
|
|
{
|
|
int argc;
|
|
|
|
init_revisions(revs, NULL);
|
|
revs->no_walk = 1;
|
|
if (action != REVERT)
|
|
revs->reverse = 1;
|
|
|
|
argc = setup_revisions(commit_argc, commit_argv, revs, NULL);
|
|
if (argc > 1)
|
|
usage(*revert_or_cherry_pick_usage());
|
|
|
|
if (prepare_revision_walk(revs))
|
|
die(_("revision walk setup failed"));
|
|
|
|
if (!revs->commits)
|
|
die(_("empty commit set passed"));
|
|
}
|
|
|
|
static void read_and_refresh_cache(const char *me)
|
|
{
|
|
static struct lock_file index_lock;
|
|
int index_fd = hold_locked_index(&index_lock, 0);
|
|
if (read_index_preload(&the_index, NULL) < 0)
|
|
die(_("git %s: failed to read the index"), me);
|
|
refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL);
|
|
if (the_index.cache_changed) {
|
|
if (write_index(&the_index, index_fd) ||
|
|
commit_locked_index(&index_lock))
|
|
die(_("git %s: failed to refresh the index"), me);
|
|
}
|
|
rollback_lock_file(&index_lock);
|
|
}
|
|
|
|
static int revert_or_cherry_pick(int argc, const char **argv)
|
|
{
|
|
struct rev_info revs;
|
|
|
|
git_config(git_default_config, NULL);
|
|
me = action == REVERT ? "revert" : "cherry-pick";
|
|
setenv(GIT_REFLOG_ACTION, me, 0);
|
|
parse_args(argc, argv);
|
|
|
|
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"));
|
|
}
|
|
|
|
read_and_refresh_cache(me);
|
|
|
|
prepare_revs(&revs);
|
|
|
|
while ((commit = get_revision(&revs))) {
|
|
int res = do_pick_commit();
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cmd_revert(int argc, const char **argv, const char *prefix)
|
|
{
|
|
if (isatty(0))
|
|
edit = 1;
|
|
action = REVERT;
|
|
return revert_or_cherry_pick(argc, argv);
|
|
}
|
|
|
|
int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
|
|
{
|
|
action = CHERRY_PICK;
|
|
return revert_or_cherry_pick(argc, argv);
|
|
}
|