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authorJohannes Schindelin <Johannes.Schindelin@gmx.de>2007-03-01 04:26:30 (GMT)
committerJunio C Hamano <junkio@cox.net>2007-03-04 06:59:34 (GMT)
commit9509af686bffdbd7c3f17faf3c07d2034d480ffc (patch)
treeb3d78e8dfd6bd865bb48330e19576acaaae9ef66 /builtin-revert.c
parente551208dea5cd40721c437faafb6d604dedffef5 (diff)
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Make git-revert & git-cherry-pick a builtin
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'builtin-revert.c')
-rw-r--r--builtin-revert.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/builtin-revert.c b/builtin-revert.c
new file mode 100644
index 0000000..bc3cfcb
--- /dev/null
+++ b/builtin-revert.c
@@ -0,0 +1,406 @@
+#include "cache.h"
+#include "builtin.h"
+#include "object.h"
+#include "commit.h"
+#include "tag.h"
+#include "wt-status.h"
+#include "run-command.h"
+#include "exec_cmd.h"
+#include "utf8.h"
+
+/*
+ * This implements the builtins revert and cherry-pick.
+ *
+ * Copyright (c) 2007 Johannes E. Schindelin
+ *
+ * Based on git-revert.sh, which is
+ *
+ * Copyright (c) 2005 Linus Torvalds
+ * Copyright (c) 2005 Junio C Hamano
+ */
+
+static const char *revert_usage = "git-revert [--edit | --no-edit] [-n] <commit-ish>";
+
+static const char *cherry_pick_usage = "git-cherry-pick [--edit] [-n] [-r] [-x] <commit-ish>";
+
+static int edit;
+static int replay;
+enum { REVERT, CHERRY_PICK } action;
+static int no_commit;
+static struct commit *commit;
+static int needed_deref;
+
+static const char *me;
+
+#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
+
+static void parse_options(int argc, const char **argv)
+{
+ const char *usage_str = action == REVERT ?
+ revert_usage : cherry_pick_usage;
+ unsigned char sha1[20];
+ const char *arg;
+ int i;
+
+ if (argc < 2)
+ usage(usage_str);
+
+ for (i = 1; i < argc - 1; i++) {
+ arg = argv[i];
+ if (!strcmp(arg, "-n") || !strcmp(arg, "--no-commit"))
+ no_commit = 1;
+ else if (!strcmp(arg, "-e") || !strcmp(arg, "--edit"))
+ edit = 1;
+ else if (!strcmp(arg, "--no-edit"))
+ edit = 0;
+ else if (!strcmp(arg, "-x") || !strcmp(arg, "--i-really-want-"
+ "to-expose-my-private-commit-object-name"))
+ replay = 0;
+ else if (strcmp(arg, "-r"))
+ usage(usage_str);
+ }
+
+ arg = argv[argc - 1];
+ if (get_sha1(arg, sha1))
+ die ("Cannot find '%s'", arg);
+ commit = (struct commit *)parse_object(sha1);
+ if (!commit)
+ die ("Could not find %s", sha1_to_hex(sha1));
+ if (commit->object.type == OBJ_TAG) {
+ commit = (struct commit *)
+ deref_tag((struct object *)commit, arg, strlen(arg));
+ needed_deref = 1;
+ }
+ if (commit->object.type != OBJ_COMMIT)
+ die ("'%s' does not point to a commit", arg);
+}
+
+static char *get_oneline(const char *message)
+{
+ char *result;
+ const char *p = message, *abbrev, *eol;
+ int abbrev_len, oneline_len;
+
+ if (!p)
+ die ("Could not read commit message of %s",
+ sha1_to_hex(commit->object.sha1));
+ while (*p && (*p != '\n' || p[1] != '\n'))
+ p++;
+
+ if (*p) {
+ p += 2;
+ for (eol = p + 1; *eol && *eol != '\n'; eol++)
+ ; /* do nothing */
+ } else
+ eol = p;
+ abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
+ abbrev_len = strlen(abbrev);
+ oneline_len = eol - p;
+ result = xmalloc(abbrev_len + 5 + oneline_len);
+ memcpy(result, abbrev, abbrev_len);
+ memcpy(result + abbrev_len, "... ", 4);
+ memcpy(result + abbrev_len + 4, p, oneline_len);
+ result[abbrev_len + 4 + oneline_len] = '\0';
+ return result;
+}
+
+char *get_encoding(const char *message)
+{
+ const char *p = message, *eol;
+
+ if (!p)
+ die ("Could not read commit message of %s",
+ sha1_to_hex(commit->object.sha1));
+ while (*p && *p != '\n') {
+ for (eol = p + 1; *eol && *eol != '\n'; eol++)
+ ; /* do nothing */
+ if (!prefixcmp(p, "encoding ")) {
+ char *result = xmalloc(eol - 8 - p);
+ strlcpy(result, p + 9, eol - 8 - p);
+ return result;
+ }
+ p = eol;
+ if (*p == '\n')
+ p++;
+ }
+ return NULL;
+}
+
+struct lock_file msg_file;
+static int msg_fd;
+
+static void add_to_msg(const char *string)
+{
+ int len = strlen(string);
+ if (write_in_full(msg_fd, string, len) < 0)
+ die ("Could not write to .msg");
+}
+
+static void add_message_to_msg(const char *message)
+{
+ const char *p = message;
+ while (*p && (*p != '\n' || p[1] != '\n'))
+ p++;
+
+ if (!*p)
+ add_to_msg(sha1_to_hex(commit->object.sha1));
+
+ p += 2;
+ add_to_msg(p);
+ return;
+}
+
+static void set_author_ident_env(const char *message)
+{
+ const char *p = message;
+ if (!p)
+ die ("Could not read commit message of %s",
+ sha1_to_hex(commit->object.sha1));
+ while (*p && *p != '\n') {
+ const char *eol;
+
+ for (eol = p; *eol && *eol != '\n'; eol++)
+ ; /* do nothing */
+ if (!prefixcmp(p, "author ")) {
+ char *line, *pend, *email, *timestamp;
+
+ p += 7;
+ line = xmalloc(eol + 1 - p);
+ memcpy(line, p, eol - p);
+ line[eol - p] = '\0';
+ email = strchr(line, '<');
+ if (!email)
+ die ("Could not extract author email from %s",
+ sha1_to_hex(commit->object.sha1));
+ if (email == line)
+ pend = line;
+ else
+ for (pend = email; pend != line + 1 &&
+ isspace(pend[-1]); pend--);
+ ; /* do nothing */
+ *pend = '\0';
+ email++;
+ timestamp = strchr(email, '>');
+ if (!timestamp)
+ die ("Could not extract author email from %s",
+ sha1_to_hex(commit->object.sha1));
+ *timestamp = '\0';
+ for (timestamp++; *timestamp && isspace(*timestamp);
+ timestamp++)
+ ; /* do nothing */
+ setenv("GIT_AUTHOR_NAME", line, 1);
+ setenv("GIT_AUTHOR_EMAIL", email, 1);
+ setenv("GIT_AUTHOR_DATE", timestamp, 1);
+ free(line);
+ return;
+ }
+ p = eol;
+ if (*p == '\n')
+ p++;
+ }
+ die ("No author information found in %s",
+ sha1_to_hex(commit->object.sha1));
+}
+
+static int merge_recursive(const char *base_sha1,
+ const char *head_sha1, const char *head_name,
+ const char *next_sha1, const char *next_name)
+{
+ char buffer[256];
+
+ sprintf(buffer, "GITHEAD_%s", head_sha1);
+ setenv(buffer, head_name, 1);
+ sprintf(buffer, "GITHEAD_%s", next_sha1);
+ setenv(buffer, next_name, 1);
+
+ /*
+ * This three way merge is an interesting one. We are at
+ * $head, and would want to apply the change between $commit
+ * and $prev on top of us (when reverting), or the change between
+ * $prev and $commit on top of us (when cherry-picking or replaying).
+ */
+
+ return run_command_opt(RUN_COMMAND_NO_STDIN | RUN_GIT_CMD,
+ "merge-recursive", base_sha1, "--",
+ head_sha1, next_sha1, NULL);
+}
+
+static int revert_or_cherry_pick(int argc, const char **argv)
+{
+ unsigned char head[20];
+ struct commit *base, *next;
+ int i;
+ char *oneline, *encoding, *reencoded_message = NULL;
+ const char *message;
+
+ git_config(git_default_config);
+ me = action == REVERT ? "revert" : "cherry-pick";
+ setenv(GIT_REFLOG_ACTION, me, 0);
+ parse_options(argc, argv);
+
+ /* this is copied from the shell script, but it's never triggered... */
+ if (action == REVERT && replay)
+ die("revert is incompatible with replay");
+
+ if (no_commit) {
+ /*
+ * We do not intend to commit immediately. We just want to
+ * merge the differences in.
+ */
+ if (write_tree(head, 0, NULL))
+ die ("Your index file is unmerged.");
+ } else {
+ struct wt_status s;
+
+ if (get_sha1("HEAD", head))
+ die ("You do not have a valid HEAD");
+ wt_status_prepare(&s);
+ if (s.commitable || s.workdir_dirty)
+ die ("Dirty index: cannot %s", me);
+ discard_cache();
+ }
+
+ if (!commit->parents)
+ die ("Cannot %s a root commit", me);
+ if (commit->parents->next)
+ die ("Cannot %s a multi-parent commit.", me);
+ if (!(message = commit->buffer))
+ die ("Cannot get commit message for %s",
+ sha1_to_hex(commit->object.sha1));
+
+ /*
+ * "commit" is an existing commit. We would want to apply
+ * the difference it introduces since its first parent "prev"
+ * on top of the current HEAD if we are cherry-pick. Or the
+ * reverse of it if we are revert.
+ */
+
+ msg_fd = hold_lock_file_for_update(&msg_file, ".msg", 1);
+
+ encoding = get_encoding(message);
+ if (!encoding)
+ encoding = "utf-8";
+ if (!git_commit_encoding)
+ git_commit_encoding = "utf-8";
+ if ((reencoded_message = reencode_string(message,
+ git_commit_encoding, encoding)))
+ message = reencoded_message;
+
+ oneline = get_oneline(message);
+
+ if (action == REVERT) {
+ base = commit;
+ next = commit->parents->item;
+ add_to_msg("Revert ");
+ add_to_msg(find_unique_abbrev(commit->object.sha1,
+ DEFAULT_ABBREV));
+ add_to_msg(oneline);
+ add_to_msg("\nThis reverts commit ");
+ add_to_msg(sha1_to_hex(commit->object.sha1));
+ add_to_msg(".\n");
+ } else {
+ base = commit->parents->item;
+ next = commit;
+ set_author_ident_env(message);
+ add_message_to_msg(message);
+ if (replay) {
+ add_to_msg("\n(cherry picked from commit ");
+ add_to_msg(sha1_to_hex(commit->object.sha1));
+ add_to_msg(")\n");
+ }
+ }
+ if (needed_deref) {
+ add_to_msg("(original 'git ");
+ add_to_msg(me);
+ add_to_msg("' arguments: ");
+ for (i = 0; i < argc; i++) {
+ if (i)
+ add_to_msg(" ");
+ add_to_msg(argv[i]);
+ }
+ add_to_msg(")\n");
+ }
+
+ if (merge_recursive(sha1_to_hex(base->object.sha1),
+ sha1_to_hex(head), "HEAD",
+ sha1_to_hex(next->object.sha1), oneline))
+ exit(1);
+ if (write_tree(head, 0, NULL)) {
+ const char *target = git_path("MERGE_MSG");
+ add_to_msg("\nConflicts:\n\n");
+ read_cache();
+ for (i = 0; i < active_nr;) {
+ struct cache_entry *ce = active_cache[i++];
+ if (ce_stage(ce)) {
+ add_to_msg("\t");
+ add_to_msg(ce->name);
+ add_to_msg("\n");
+ while (i < active_nr && !strcmp(ce->name,
+ active_cache[i]->name))
+ i++;
+ }
+ }
+ if (close(msg_fd) || commit_lock_file(&msg_file) < 0)
+ die ("Error wrapping up .msg");
+ unlink(target);
+ if (rename(".msg", target))
+ die ("Could not move .msg to %s", target);
+ fprintf(stderr, "Automatic %s failed. "
+ "After resolving the conflicts,\n"
+ "mark the corrected paths with 'git-add <paths>'\n"
+ "and commit the result.\n", me);
+ if (action == CHERRY_PICK) {
+ fprintf(stderr, "You may choose to use the following "
+ "when making the commit:\n"
+ "GIT_AUTHOR_NAME=\"%s\"\n",
+ getenv("GIT_AUTHOR_NAME"));
+ fprintf(stderr, "GIT_AUTHOR_EMAIL=\"%s\"\n",
+ getenv("GIT_AUTHOR_EMAIL"));
+ fprintf(stderr, "GIT_AUTHOR_DATE=\"%s\"\n"
+ "export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL "
+ "GIT_AUTHOR_DATE\n",
+ getenv("GIT_AUTHOR_DATE"));
+ }
+ exit(1);
+ }
+ if (close(msg_fd) || commit_lock_file(&msg_file) < 0)
+ die ("Error wrapping up .msg");
+ fprintf(stderr, "Finished one %s.\n", me);
+
+ /*
+ *
+ * If we are cherry-pick, and if the merge did not result in
+ * hand-editing, we will hit this commit and inherit the original
+ * author date and name.
+ * If we are revert, or if our cherry-pick results in a hand merge,
+ * we had better say that the current user is responsible for that.
+ */
+
+ if (!no_commit) {
+ if (edit)
+ return execl_git_cmd("commit", "-n", "-F", ".msg",
+ "-e", NULL);
+ else
+ return execl_git_cmd("commit", "-n", "-F", ".msg",
+ NULL);
+ }
+ if (reencoded_message)
+ free(reencoded_message);
+
+ 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)
+{
+ replay = 1;
+ action = CHERRY_PICK;
+ return revert_or_cherry_pick(argc, argv);
+}