summaryrefslogtreecommitdiffstats
path: root/builtin/replace.c
diff options
context:
space:
mode:
Diffstat (limited to 'builtin/replace.c')
-rw-r--r--builtin/replace.c626
1 files changed, 626 insertions, 0 deletions
diff --git a/builtin/replace.c b/builtin/replace.c
new file mode 100644
index 0000000..a29e911
--- /dev/null
+++ b/builtin/replace.c
@@ -0,0 +1,626 @@
+/*
+ * Builtin "git replace"
+ *
+ * Copyright (c) 2008 Christian Couder <chriscool@tuxfamily.org>
+ *
+ * Based on builtin/tag.c by Kristian Høgsberg <krh@redhat.com>
+ * and Carlos Rica <jasampler@gmail.com> that was itself based on
+ * git-tag.sh and mktag.c by Linus Torvalds.
+ */
+
+#include "cache.h"
+#include "config.h"
+#include "builtin.h"
+#include "refs.h"
+#include "parse-options.h"
+#include "run-command.h"
+#include "object-store.h"
+#include "repository.h"
+#include "tag.h"
+
+static const char * const git_replace_usage[] = {
+ N_("git replace [-f] <object> <replacement>"),
+ N_("git replace [-f] --edit <object>"),
+ N_("git replace [-f] --graft <commit> [<parent>...]"),
+ "git replace [-f] --convert-graft-file",
+ N_("git replace -d <object>..."),
+ N_("git replace [--format=<format>] [-l [<pattern>]]"),
+ NULL
+};
+
+enum replace_format {
+ REPLACE_FORMAT_SHORT,
+ REPLACE_FORMAT_MEDIUM,
+ REPLACE_FORMAT_LONG
+};
+
+struct show_data {
+ const char *pattern;
+ enum replace_format format;
+};
+
+static int show_reference(struct repository *r, const char *refname,
+ const struct object_id *oid,
+ int flag, void *cb_data)
+{
+ struct show_data *data = cb_data;
+
+ if (!wildmatch(data->pattern, refname, 0)) {
+ if (data->format == REPLACE_FORMAT_SHORT)
+ printf("%s\n", refname);
+ else if (data->format == REPLACE_FORMAT_MEDIUM)
+ printf("%s -> %s\n", refname, oid_to_hex(oid));
+ else { /* data->format == REPLACE_FORMAT_LONG */
+ struct object_id object;
+ enum object_type obj_type, repl_type;
+
+ if (get_oid(refname, &object))
+ return error(_("failed to resolve '%s' as a valid ref"), refname);
+
+ obj_type = oid_object_info(r, &object, NULL);
+ repl_type = oid_object_info(r, oid, NULL);
+
+ printf("%s (%s) -> %s (%s)\n", refname, type_name(obj_type),
+ oid_to_hex(oid), type_name(repl_type));
+ }
+ }
+
+ return 0;
+}
+
+static int list_replace_refs(const char *pattern, const char *format)
+{
+ struct show_data data;
+
+ if (!pattern)
+ pattern = "*";
+ data.pattern = pattern;
+
+ if (format == NULL || *format == '\0' || !strcmp(format, "short"))
+ data.format = REPLACE_FORMAT_SHORT;
+ else if (!strcmp(format, "medium"))
+ data.format = REPLACE_FORMAT_MEDIUM;
+ else if (!strcmp(format, "long"))
+ data.format = REPLACE_FORMAT_LONG;
+ /*
+ * Please update _git_replace() in git-completion.bash when
+ * you add new format
+ */
+ else
+ return error(_("invalid replace format '%s'\n"
+ "valid formats are 'short', 'medium' and 'long'"),
+ format);
+
+ for_each_replace_ref(the_repository, show_reference, (void *)&data);
+
+ return 0;
+}
+
+typedef int (*each_replace_name_fn)(const char *name, const char *ref,
+ const struct object_id *oid);
+
+static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
+{
+ const char **p, *full_hex;
+ struct strbuf ref = STRBUF_INIT;
+ size_t base_len;
+ int had_error = 0;
+ struct object_id oid;
+ const char *git_replace_ref_base = ref_namespace[NAMESPACE_REPLACE].ref;
+
+ strbuf_addstr(&ref, git_replace_ref_base);
+ base_len = ref.len;
+
+ for (p = argv; *p; p++) {
+ if (get_oid(*p, &oid)) {
+ error("failed to resolve '%s' as a valid ref", *p);
+ had_error = 1;
+ continue;
+ }
+
+ strbuf_setlen(&ref, base_len);
+ strbuf_addstr(&ref, oid_to_hex(&oid));
+ full_hex = ref.buf + base_len;
+
+ if (read_ref(ref.buf, &oid)) {
+ error(_("replace ref '%s' not found"), full_hex);
+ had_error = 1;
+ continue;
+ }
+ if (fn(full_hex, ref.buf, &oid))
+ had_error = 1;
+ }
+ strbuf_release(&ref);
+ return had_error;
+}
+
+static int delete_replace_ref(const char *name, const char *ref,
+ const struct object_id *oid)
+{
+ if (delete_ref(NULL, ref, oid, 0))
+ return 1;
+ printf_ln(_("Deleted replace ref '%s'"), name);
+ return 0;
+}
+
+static int check_ref_valid(struct object_id *object,
+ struct object_id *prev,
+ struct strbuf *ref,
+ int force)
+{
+ const char *git_replace_ref_base = ref_namespace[NAMESPACE_REPLACE].ref;
+
+ strbuf_reset(ref);
+ strbuf_addf(ref, "%s%s", git_replace_ref_base, oid_to_hex(object));
+ if (check_refname_format(ref->buf, 0))
+ return error(_("'%s' is not a valid ref name"), ref->buf);
+
+ if (read_ref(ref->buf, prev))
+ oidclr(prev);
+ else if (!force)
+ return error(_("replace ref '%s' already exists"), ref->buf);
+ return 0;
+}
+
+static int replace_object_oid(const char *object_ref,
+ struct object_id *object,
+ const char *replace_ref,
+ struct object_id *repl,
+ int force)
+{
+ struct object_id prev;
+ enum object_type obj_type, repl_type;
+ struct strbuf ref = STRBUF_INIT;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+ int res = 0;
+
+ obj_type = oid_object_info(the_repository, object, NULL);
+ repl_type = oid_object_info(the_repository, repl, NULL);
+ if (!force && obj_type != repl_type)
+ return error(_("Objects must be of the same type.\n"
+ "'%s' points to a replaced object of type '%s'\n"
+ "while '%s' points to a replacement object of "
+ "type '%s'."),
+ object_ref, type_name(obj_type),
+ replace_ref, type_name(repl_type));
+
+ if (check_ref_valid(object, &prev, &ref, force)) {
+ strbuf_release(&ref);
+ return -1;
+ }
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, ref.buf, repl, &prev,
+ 0, NULL, &err) ||
+ ref_transaction_commit(transaction, &err))
+ res = error("%s", err.buf);
+
+ ref_transaction_free(transaction);
+ strbuf_release(&ref);
+ return res;
+}
+
+static int replace_object(const char *object_ref, const char *replace_ref, int force)
+{
+ struct object_id object, repl;
+
+ if (get_oid(object_ref, &object))
+ return error(_("failed to resolve '%s' as a valid ref"),
+ object_ref);
+ if (get_oid(replace_ref, &repl))
+ return error(_("failed to resolve '%s' as a valid ref"),
+ replace_ref);
+
+ return replace_object_oid(object_ref, &object, replace_ref, &repl, force);
+}
+
+/*
+ * Write the contents of the object named by "sha1" to the file "filename".
+ * If "raw" is true, then the object's raw contents are printed according to
+ * "type". Otherwise, we pretty-print the contents for human editing.
+ */
+static int export_object(const struct object_id *oid, enum object_type type,
+ int raw, const char *filename)
+{
+ struct child_process cmd = CHILD_PROCESS_INIT;
+ int fd;
+
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (fd < 0)
+ return error_errno(_("unable to open %s for writing"), filename);
+
+ strvec_push(&cmd.args, "--no-replace-objects");
+ strvec_push(&cmd.args, "cat-file");
+ if (raw)
+ strvec_push(&cmd.args, type_name(type));
+ else
+ strvec_push(&cmd.args, "-p");
+ strvec_push(&cmd.args, oid_to_hex(oid));
+ cmd.git_cmd = 1;
+ cmd.out = fd;
+
+ if (run_command(&cmd))
+ return error(_("cat-file reported failure"));
+ return 0;
+}
+
+/*
+ * Read a previously-exported (and possibly edited) object back from "filename",
+ * interpreting it as "type", and writing the result to the object database.
+ * The sha1 of the written object is returned via sha1.
+ */
+static int import_object(struct object_id *oid, enum object_type type,
+ int raw, const char *filename)
+{
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return error_errno(_("unable to open %s for reading"), filename);
+
+ if (!raw && type == OBJ_TREE) {
+ struct child_process cmd = CHILD_PROCESS_INIT;
+ struct strbuf result = STRBUF_INIT;
+
+ strvec_push(&cmd.args, "mktree");
+ cmd.git_cmd = 1;
+ cmd.in = fd;
+ cmd.out = -1;
+
+ if (start_command(&cmd)) {
+ close(fd);
+ return error(_("unable to spawn mktree"));
+ }
+
+ if (strbuf_read(&result, cmd.out, the_hash_algo->hexsz + 1) < 0) {
+ error_errno(_("unable to read from mktree"));
+ close(fd);
+ close(cmd.out);
+ return -1;
+ }
+ close(cmd.out);
+
+ if (finish_command(&cmd)) {
+ strbuf_release(&result);
+ return error(_("mktree reported failure"));
+ }
+ if (get_oid_hex(result.buf, oid) < 0) {
+ strbuf_release(&result);
+ return error(_("mktree did not return an object name"));
+ }
+
+ strbuf_release(&result);
+ } else {
+ struct stat st;
+ int flags = HASH_FORMAT_CHECK | HASH_WRITE_OBJECT;
+
+ if (fstat(fd, &st) < 0) {
+ error_errno(_("unable to fstat %s"), filename);
+ close(fd);
+ return -1;
+ }
+ if (index_fd(the_repository->index, oid, fd, &st, type, NULL, flags) < 0)
+ return error(_("unable to write object to database"));
+ /* index_fd close()s fd for us */
+ }
+
+ /*
+ * No need to close(fd) here; both run-command and index-fd
+ * will have done it for us.
+ */
+ return 0;
+}
+
+static int edit_and_replace(const char *object_ref, int force, int raw)
+{
+ char *tmpfile;
+ enum object_type type;
+ struct object_id old_oid, new_oid, prev;
+ struct strbuf ref = STRBUF_INIT;
+
+ if (get_oid(object_ref, &old_oid) < 0)
+ return error(_("not a valid object name: '%s'"), object_ref);
+
+ type = oid_object_info(the_repository, &old_oid, NULL);
+ if (type < 0)
+ return error(_("unable to get object type for %s"),
+ oid_to_hex(&old_oid));
+
+ if (check_ref_valid(&old_oid, &prev, &ref, force)) {
+ strbuf_release(&ref);
+ return -1;
+ }
+ strbuf_release(&ref);
+
+ tmpfile = git_pathdup("REPLACE_EDITOBJ");
+ if (export_object(&old_oid, type, raw, tmpfile)) {
+ free(tmpfile);
+ return -1;
+ }
+ if (launch_editor(tmpfile, NULL, NULL) < 0) {
+ free(tmpfile);
+ return error(_("editing object file failed"));
+ }
+ if (import_object(&new_oid, type, raw, tmpfile)) {
+ free(tmpfile);
+ return -1;
+ }
+ free(tmpfile);
+
+ if (oideq(&old_oid, &new_oid))
+ return error(_("new object is the same as the old one: '%s'"), oid_to_hex(&old_oid));
+
+ return replace_object_oid(object_ref, &old_oid, "replacement", &new_oid, force);
+}
+
+static int replace_parents(struct strbuf *buf, int argc, const char **argv)
+{
+ struct strbuf new_parents = STRBUF_INIT;
+ const char *parent_start, *parent_end;
+ int i;
+ const unsigned hexsz = the_hash_algo->hexsz;
+
+ /* find existing parents */
+ parent_start = buf->buf;
+ parent_start += hexsz + 6; /* "tree " + "hex sha1" + "\n" */
+ parent_end = parent_start;
+
+ while (starts_with(parent_end, "parent "))
+ parent_end += hexsz + 8; /* "parent " + "hex sha1" + "\n" */
+
+ /* prepare new parents */
+ for (i = 0; i < argc; i++) {
+ struct object_id oid;
+ struct commit *commit;
+
+ if (get_oid(argv[i], &oid) < 0) {
+ strbuf_release(&new_parents);
+ return error(_("not a valid object name: '%s'"),
+ argv[i]);
+ }
+ commit = lookup_commit_reference(the_repository, &oid);
+ if (!commit) {
+ strbuf_release(&new_parents);
+ return error(_("could not parse %s as a commit"), argv[i]);
+ }
+ strbuf_addf(&new_parents, "parent %s\n", oid_to_hex(&commit->object.oid));
+ }
+
+ /* replace existing parents with new ones */
+ strbuf_splice(buf, parent_start - buf->buf, parent_end - parent_start,
+ new_parents.buf, new_parents.len);
+
+ strbuf_release(&new_parents);
+ return 0;
+}
+
+struct check_mergetag_data {
+ int argc;
+ const char **argv;
+};
+
+static int check_one_mergetag(struct commit *commit,
+ struct commit_extra_header *extra,
+ void *data)
+{
+ struct check_mergetag_data *mergetag_data = (struct check_mergetag_data *)data;
+ const char *ref = mergetag_data->argv[0];
+ struct object_id tag_oid;
+ struct tag *tag;
+ int i;
+
+ hash_object_file(the_hash_algo, extra->value, extra->len,
+ OBJ_TAG, &tag_oid);
+ tag = lookup_tag(the_repository, &tag_oid);
+ if (!tag)
+ return error(_("bad mergetag in commit '%s'"), ref);
+ if (parse_tag_buffer(the_repository, tag, extra->value, extra->len))
+ return error(_("malformed mergetag in commit '%s'"), ref);
+
+ /* iterate over new parents */
+ for (i = 1; i < mergetag_data->argc; i++) {
+ struct object_id oid;
+ if (get_oid(mergetag_data->argv[i], &oid) < 0)
+ return error(_("not a valid object name: '%s'"),
+ mergetag_data->argv[i]);
+ if (oideq(get_tagged_oid(tag), &oid))
+ return 0; /* found */
+ }
+
+ return error(_("original commit '%s' contains mergetag '%s' that is "
+ "discarded; use --edit instead of --graft"), ref,
+ oid_to_hex(&tag_oid));
+}
+
+static int check_mergetags(struct commit *commit, int argc, const char **argv)
+{
+ struct check_mergetag_data mergetag_data;
+
+ mergetag_data.argc = argc;
+ mergetag_data.argv = argv;
+ return for_each_mergetag(check_one_mergetag, commit, &mergetag_data);
+}
+
+static int create_graft(int argc, const char **argv, int force, int gentle)
+{
+ struct object_id old_oid, new_oid;
+ const char *old_ref = argv[0];
+ struct commit *commit;
+ struct strbuf buf = STRBUF_INIT;
+ const char *buffer;
+ unsigned long size;
+
+ if (get_oid(old_ref, &old_oid) < 0)
+ return error(_("not a valid object name: '%s'"), old_ref);
+ commit = lookup_commit_reference(the_repository, &old_oid);
+ if (!commit)
+ return error(_("could not parse %s"), old_ref);
+
+ buffer = get_commit_buffer(commit, &size);
+ strbuf_add(&buf, buffer, size);
+ unuse_commit_buffer(commit, buffer);
+
+ if (replace_parents(&buf, argc - 1, &argv[1]) < 0) {
+ strbuf_release(&buf);
+ return -1;
+ }
+
+ if (remove_signature(&buf)) {
+ warning(_("the original commit '%s' has a gpg signature"), old_ref);
+ warning(_("the signature will be removed in the replacement commit!"));
+ }
+
+ if (check_mergetags(commit, argc, argv)) {
+ strbuf_release(&buf);
+ return -1;
+ }
+
+ if (write_object_file(buf.buf, buf.len, OBJ_COMMIT, &new_oid)) {
+ strbuf_release(&buf);
+ return error(_("could not write replacement commit for: '%s'"),
+ old_ref);
+ }
+
+ strbuf_release(&buf);
+
+ if (oideq(&commit->object.oid, &new_oid)) {
+ if (gentle) {
+ warning(_("graft for '%s' unnecessary"),
+ oid_to_hex(&commit->object.oid));
+ return 0;
+ }
+ return error(_("new commit is the same as the old one: '%s'"),
+ oid_to_hex(&commit->object.oid));
+ }
+
+ return replace_object_oid(old_ref, &commit->object.oid,
+ "replacement", &new_oid, force);
+}
+
+static int convert_graft_file(int force)
+{
+ const char *graft_file = get_graft_file(the_repository);
+ FILE *fp = fopen_or_warn(graft_file, "r");
+ struct strbuf buf = STRBUF_INIT, err = STRBUF_INIT;
+ struct strvec args = STRVEC_INIT;
+
+ if (!fp)
+ return -1;
+
+ no_graft_file_deprecated_advice = 1;
+ while (strbuf_getline(&buf, fp) != EOF) {
+ if (*buf.buf == '#')
+ continue;
+
+ strvec_split(&args, buf.buf);
+ if (args.nr && create_graft(args.nr, args.v, force, 1))
+ strbuf_addf(&err, "\n\t%s", buf.buf);
+ strvec_clear(&args);
+ }
+ fclose(fp);
+
+ strbuf_release(&buf);
+
+ if (!err.len)
+ return unlink_or_warn(graft_file);
+
+ warning(_("could not convert the following graft(s):\n%s"), err.buf);
+ strbuf_release(&err);
+
+ return -1;
+}
+
+int cmd_replace(int argc, const char **argv, const char *prefix)
+{
+ int force = 0;
+ int raw = 0;
+ const char *format = NULL;
+ enum {
+ MODE_UNSPECIFIED = 0,
+ MODE_LIST,
+ MODE_DELETE,
+ MODE_EDIT,
+ MODE_GRAFT,
+ MODE_CONVERT_GRAFT_FILE,
+ MODE_REPLACE
+ } cmdmode = MODE_UNSPECIFIED;
+ struct option options[] = {
+ OPT_CMDMODE('l', "list", &cmdmode, N_("list replace refs"), MODE_LIST),
+ OPT_CMDMODE('d', "delete", &cmdmode, N_("delete replace refs"), MODE_DELETE),
+ OPT_CMDMODE('e', "edit", &cmdmode, N_("edit existing object"), MODE_EDIT),
+ OPT_CMDMODE('g', "graft", &cmdmode, N_("change a commit's parents"), MODE_GRAFT),
+ OPT_CMDMODE(0, "convert-graft-file", &cmdmode, N_("convert existing graft file"), MODE_CONVERT_GRAFT_FILE),
+ OPT_BOOL_F('f', "force", &force, N_("replace the ref if it exists"),
+ PARSE_OPT_NOCOMPLETE),
+ OPT_BOOL(0, "raw", &raw, N_("do not pretty-print contents for --edit")),
+ OPT_STRING(0, "format", &format, N_("format"), N_("use this format")),
+ OPT_END()
+ };
+
+ read_replace_refs = 0;
+ git_config(git_default_config, NULL);
+
+ argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
+
+ if (!cmdmode)
+ cmdmode = argc ? MODE_REPLACE : MODE_LIST;
+
+ if (format && cmdmode != MODE_LIST)
+ usage_msg_opt(_("--format cannot be used when not listing"),
+ git_replace_usage, options);
+
+ if (force &&
+ cmdmode != MODE_REPLACE &&
+ cmdmode != MODE_EDIT &&
+ cmdmode != MODE_GRAFT &&
+ cmdmode != MODE_CONVERT_GRAFT_FILE)
+ usage_msg_opt(_("-f only makes sense when writing a replacement"),
+ git_replace_usage, options);
+
+ if (raw && cmdmode != MODE_EDIT)
+ usage_msg_opt(_("--raw only makes sense with --edit"),
+ git_replace_usage, options);
+
+ switch (cmdmode) {
+ case MODE_DELETE:
+ if (argc < 1)
+ usage_msg_opt(_("-d needs at least one argument"),
+ git_replace_usage, options);
+ return for_each_replace_name(argv, delete_replace_ref);
+
+ case MODE_REPLACE:
+ if (argc != 2)
+ usage_msg_opt(_("bad number of arguments"),
+ git_replace_usage, options);
+ return replace_object(argv[0], argv[1], force);
+
+ case MODE_EDIT:
+ if (argc != 1)
+ usage_msg_opt(_("-e needs exactly one argument"),
+ git_replace_usage, options);
+ return edit_and_replace(argv[0], force, raw);
+
+ case MODE_GRAFT:
+ if (argc < 1)
+ usage_msg_opt(_("-g needs at least one argument"),
+ git_replace_usage, options);
+ return create_graft(argc, argv, force, 0);
+
+ case MODE_CONVERT_GRAFT_FILE:
+ if (argc != 0)
+ usage_msg_opt(_("--convert-graft-file takes no argument"),
+ git_replace_usage, options);
+ return !!convert_graft_file(force);
+
+ case MODE_LIST:
+ if (argc > 1)
+ usage_msg_opt(_("only one pattern can be given with -l"),
+ git_replace_usage, options);
+ return list_replace_refs(argv[0], format);
+
+ default:
+ BUG("invalid cmdmode %d", (int)cmdmode);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-18 01:54:20 +0000