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![Johannes Schindelin](/assets/img/avatar_default.png)
A root commit couldn't be cherry-picked. But its semantics can be defined as simply merging two trees by overlaying disjoint parts and merging overlapping files without any common ancestor. You should be able to rebase originally independent branches on top of another branch by using this. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
448 lines
11 KiB
C
448 lines
11 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 "wt-status.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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/*
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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;
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static enum { REVERT, CHERRY_PICK } action;
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static struct commit *commit;
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static const char *me;
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#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
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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 =
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action == REVERT ? revert_usage : cherry_pick_usage;
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unsigned char sha1[20];
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const char *arg;
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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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OPT_BOOLEAN('x', NULL, &no_replay, "append commit name when cherry-picking"),
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OPT_BOOLEAN('r', NULL, &noop, "no-op (backward compatibility)"),
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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_END(),
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};
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if (parse_options(argc, argv, options, usage_str, 0) != 1)
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usage_with_options(usage_str, options);
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arg = argv[0];
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if (get_sha1(arg, sha1))
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die ("Cannot find '%s'", arg);
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commit = (struct commit *)parse_object(sha1);
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if (!commit)
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die ("Could not find %s", sha1_to_hex(sha1));
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if (commit->object.type == OBJ_TAG) {
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commit = (struct commit *)
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deref_tag((struct object *)commit, arg, strlen(arg));
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}
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if (commit->object.type != OBJ_COMMIT)
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die ("'%s' does not point to a commit", arg);
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}
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static char *get_oneline(const char *message)
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{
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char *result;
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const char *p = message, *abbrev, *eol;
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int abbrev_len, oneline_len;
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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' || p[1] != '\n'))
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p++;
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if (*p) {
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p += 2;
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for (eol = p + 1; *eol && *eol != '\n'; eol++)
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; /* do nothing */
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} else
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eol = p;
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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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oneline_len = eol - p;
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result = xmalloc(abbrev_len + 5 + oneline_len);
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memcpy(result, abbrev, abbrev_len);
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memcpy(result + abbrev_len, "... ", 4);
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memcpy(result + abbrev_len + 4, p, oneline_len);
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result[abbrev_len + 4 + oneline_len] = '\0';
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return result;
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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 struct lock_file msg_file;
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static int msg_fd;
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static void add_to_msg(const char *string)
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{
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int len = strlen(string);
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if (write_in_full(msg_fd, string, len) < 0)
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die ("Could not write to MERGE_MSG");
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}
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static void add_message_to_msg(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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add_to_msg(sha1_to_hex(commit->object.sha1));
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p += 2;
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add_to_msg(p);
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return;
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}
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static void set_author_ident_env(const char *message)
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{
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const char *p = message;
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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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const char *eol;
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for (eol = p; *eol && *eol != '\n'; eol++)
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; /* do nothing */
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if (!prefixcmp(p, "author ")) {
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char *line, *pend, *email, *timestamp;
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p += 7;
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line = xmemdupz(p, eol - p);
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email = strchr(line, '<');
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if (!email)
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die ("Could not extract author email from %s",
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sha1_to_hex(commit->object.sha1));
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if (email == line)
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pend = line;
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else
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for (pend = email; pend != line + 1 &&
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isspace(pend[-1]); pend--);
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; /* do nothing */
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*pend = '\0';
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email++;
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timestamp = strchr(email, '>');
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if (!timestamp)
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die ("Could not extract author email from %s",
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sha1_to_hex(commit->object.sha1));
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*timestamp = '\0';
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for (timestamp++; *timestamp && isspace(*timestamp);
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timestamp++)
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; /* do nothing */
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setenv("GIT_AUTHOR_NAME", line, 1);
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setenv("GIT_AUTHOR_EMAIL", email, 1);
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setenv("GIT_AUTHOR_DATE", timestamp, 1);
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free(line);
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return;
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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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die ("No author information found in %s",
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sha1_to_hex(commit->object.sha1));
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}
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static int merge_recursive(const char *base_sha1,
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const char *head_sha1, const char *head_name,
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const char *next_sha1, const char *next_name)
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{
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char buffer[256];
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const char *argv[6];
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int i = 0;
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sprintf(buffer, "GITHEAD_%s", head_sha1);
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setenv(buffer, head_name, 1);
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sprintf(buffer, "GITHEAD_%s", next_sha1);
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setenv(buffer, next_name, 1);
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/*
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* This three way merge is an interesting one. We are at
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* $head, and would want to apply the change between $commit
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* and $prev on top of us (when reverting), or the change between
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* $prev and $commit on top of us (when cherry-picking or replaying).
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*/
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argv[i++] = "merge-recursive";
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if (base_sha1)
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argv[i++] = base_sha1;
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argv[i++] = "--";
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argv[i++] = head_sha1;
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argv[i++] = next_sha1;
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argv[i++] = NULL;
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return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD);
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}
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static char *help_msg(const unsigned char *sha1)
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{
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static char helpbuf[1024];
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char *msg = getenv("GIT_CHERRY_PICK_HELP");
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if (msg)
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return msg;
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strcpy(helpbuf, " After resolving the conflicts,\n"
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"mark the corrected paths with 'git add <paths>' "
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"or 'git rm <paths>' and commit the result.");
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if (action == CHERRY_PICK) {
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sprintf(helpbuf + strlen(helpbuf),
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"\nWhen commiting, use the option "
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"'-c %s' to retain authorship and message.",
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find_unique_abbrev(sha1, DEFAULT_ABBREV));
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}
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return helpbuf;
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}
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static int index_is_dirty(void)
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{
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struct rev_info rev;
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init_revisions(&rev, NULL);
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setup_revisions(0, NULL, &rev, "HEAD");
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DIFF_OPT_SET(&rev.diffopt, QUIET);
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DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
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run_diff_index(&rev, 1);
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return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
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}
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static int revert_or_cherry_pick(int argc, const char **argv)
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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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int i;
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char *oneline, *reencoded_message = NULL;
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const char *message, *encoding;
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const char *defmsg = xstrdup(git_path("MERGE_MSG"));
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git_config(git_default_config, NULL);
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me = action == REVERT ? "revert" : "cherry-pick";
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setenv(GIT_REFLOG_ACTION, me, 0);
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parse_args(argc, argv);
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/* this is copied from the shell script, but it's never triggered... */
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if (action == REVERT && !no_replay)
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die("revert is incompatible with replay");
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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 (read_cache() < 0)
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die("could not read the index");
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if (index_is_dirty())
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die ("Dirty index: cannot %s", me);
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discard_cache();
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}
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if (!commit->parents) {
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if (action == REVERT)
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die ("Cannot revert a root commit");
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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 (!(message = commit->buffer))
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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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msg_fd = hold_lock_file_for_update(&msg_file, defmsg, 1);
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encoding = get_encoding(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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if ((reencoded_message = reencode_string(message,
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git_commit_encoding, encoding)))
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message = reencoded_message;
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oneline = get_oneline(message);
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if (action == REVERT) {
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char *oneline_body = strchr(oneline, ' ');
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base = commit;
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next = parent;
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add_to_msg("Revert \"");
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add_to_msg(oneline_body + 1);
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add_to_msg("\"\n\nThis reverts commit ");
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add_to_msg(sha1_to_hex(commit->object.sha1));
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add_to_msg(".\n");
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} else {
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base = parent;
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next = commit;
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set_author_ident_env(message);
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add_message_to_msg(message);
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if (no_replay) {
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add_to_msg("(cherry picked from commit ");
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add_to_msg(sha1_to_hex(commit->object.sha1));
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add_to_msg(")\n");
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}
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}
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if (merge_recursive(base == NULL ?
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NULL : sha1_to_hex(base->object.sha1),
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sha1_to_hex(head), "HEAD",
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sha1_to_hex(next->object.sha1), oneline) ||
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write_cache_as_tree(head, 0, NULL)) {
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add_to_msg("\nConflicts:\n\n");
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read_cache();
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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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add_to_msg("\t");
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add_to_msg(ce->name);
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add_to_msg("\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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if (commit_lock_file(&msg_file) < 0)
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die ("Error wrapping up %s", defmsg);
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fprintf(stderr, "Automatic %s failed.%s\n",
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me, help_msg(commit->object.sha1));
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exit(1);
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}
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if (commit_lock_file(&msg_file) < 0)
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die ("Error wrapping up %s", defmsg);
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fprintf(stderr, "Finished one %s.\n", me);
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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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if (!no_commit) {
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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 execv_git_cmd(args);
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}
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free(reencoded_message);
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return 0;
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}
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int cmd_revert(int argc, const char **argv, const char *prefix)
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{
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if (isatty(0))
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edit = 1;
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no_replay = 1;
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action = REVERT;
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return revert_or_cherry_pick(argc, argv);
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}
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int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
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{
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no_replay = 0;
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action = CHERRY_PICK;
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return revert_or_cherry_pick(argc, argv);
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}
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