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![Pierre Habouzit](/assets/img/avatar_default.png)
Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
401 lines
10 KiB
C
401 lines
10 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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/*
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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 *revert_usage = "git-revert [--edit | --no-edit] [-n] <commit-ish>";
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static const char *cherry_pick_usage = "git-cherry-pick [--edit] [-n] [-r] [-x] <commit-ish>";
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static int edit;
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static int replay;
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static enum { REVERT, CHERRY_PICK } action;
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static int no_commit;
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static struct commit *commit;
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static int needed_deref;
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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_options(int argc, const char **argv)
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{
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const char *usage_str = action == REVERT ?
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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 i;
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if (argc < 2)
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usage(usage_str);
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for (i = 1; i < argc; i++) {
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arg = argv[i];
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if (arg[0] != '-')
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break;
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if (!strcmp(arg, "-n") || !strcmp(arg, "--no-commit"))
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no_commit = 1;
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else if (!strcmp(arg, "-e") || !strcmp(arg, "--edit"))
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edit = 1;
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else if (!strcmp(arg, "--no-edit"))
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edit = 0;
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else if (!strcmp(arg, "-x") || !strcmp(arg, "--i-really-want-"
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"to-expose-my-private-commit-object-name"))
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replay = 0;
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else if (strcmp(arg, "-r"))
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usage(usage_str);
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}
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if (i != argc - 1)
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usage(usage_str);
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arg = argv[argc - 1];
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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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needed_deref = 1;
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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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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[0] = "merge-recursive";
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argv[1] = base_sha1;
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argv[2] = "--";
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argv[3] = head_sha1;
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argv[4] = next_sha1;
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argv[5] = 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 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;
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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);
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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_options(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 && 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.
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*/
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if (write_tree(head, 0, NULL))
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die ("Your index file is unmerged.");
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} else {
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struct wt_status s;
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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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wt_status_prepare(&s);
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if (s.commitable || s.workdir_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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die ("Cannot %s a root commit", me);
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if (commit->parents->next)
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die ("Cannot %s a multi-parent commit.", me);
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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 = commit->parents->item;
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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 = commit->parents->item;
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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 (!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 (needed_deref) {
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add_to_msg("(original 'git ");
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add_to_msg(me);
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add_to_msg("' arguments: ");
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for (i = 0; i < argc; i++) {
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if (i)
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add_to_msg(" ");
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add_to_msg(argv[i]);
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}
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add_to_msg(")\n");
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}
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if (merge_recursive(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_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 (close(msg_fd) || 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. "
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"After resolving the conflicts,\n"
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"mark the corrected paths with 'git-add <paths>'\n"
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"and commit the result.\n", me);
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if (action == CHERRY_PICK) {
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fprintf(stderr, "When commiting, use the option "
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"'-c %s' to retain authorship and message.\n",
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find_unique_abbrev(commit->object.sha1,
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DEFAULT_ABBREV));
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}
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exit(1);
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}
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if (close(msg_fd) || 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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if (edit)
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return execl_git_cmd("commit", "-n", NULL);
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else
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return execl_git_cmd("commit", "-n", "-F", defmsg, NULL);
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}
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if (reencoded_message)
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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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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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replay = 1;
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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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