| /* |
| * 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 "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>...]"), |
| 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(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(&object, NULL); |
| repl_type = oid_object_info(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 == NULL) |
| 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; |
| else |
| die("invalid replace format '%s'\n" |
| "valid formats are 'short', 'medium' and 'long'\n", |
| format); |
| |
| for_each_replace_ref(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; |
| |
| 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("Deleted replace ref '%s'\n", name); |
| return 0; |
| } |
| |
| static void check_ref_valid(struct object_id *object, |
| struct object_id *prev, |
| struct strbuf *ref, |
| int force) |
| { |
| strbuf_reset(ref); |
| strbuf_addf(ref, "%s%s", git_replace_ref_base, oid_to_hex(object)); |
| if (check_refname_format(ref->buf, 0)) |
| die("'%s' is not a valid ref name.", ref->buf); |
| |
| if (read_ref(ref->buf, prev)) |
| oidclr(prev); |
| else if (!force) |
| die("replace ref '%s' already exists", ref->buf); |
| } |
| |
| 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; |
| |
| obj_type = oid_object_info(object, NULL); |
| repl_type = oid_object_info(repl, NULL); |
| if (!force && obj_type != repl_type) |
| die("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)); |
| |
| check_ref_valid(object, &prev, &ref, force); |
| |
| transaction = ref_transaction_begin(&err); |
| if (!transaction || |
| ref_transaction_update(transaction, ref.buf, repl, &prev, |
| 0, NULL, &err) || |
| ref_transaction_commit(transaction, &err)) |
| die("%s", err.buf); |
| |
| ref_transaction_free(transaction); |
| strbuf_release(&ref); |
| return 0; |
| } |
| |
| 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)) |
| die("Failed to resolve '%s' as a valid ref.", object_ref); |
| if (get_oid(replace_ref, &repl)) |
| die("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 void 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) |
| die_errno("unable to open %s for writing", filename); |
| |
| argv_array_push(&cmd.args, "--no-replace-objects"); |
| argv_array_push(&cmd.args, "cat-file"); |
| if (raw) |
| argv_array_push(&cmd.args, type_name(type)); |
| else |
| argv_array_push(&cmd.args, "-p"); |
| argv_array_push(&cmd.args, oid_to_hex(oid)); |
| cmd.git_cmd = 1; |
| cmd.out = fd; |
| |
| if (run_command(&cmd)) |
| die("cat-file reported failure"); |
| } |
| |
| /* |
| * 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 void 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) |
| die_errno("unable to open %s for reading", filename); |
| |
| if (!raw && type == OBJ_TREE) { |
| const char *argv[] = { "mktree", NULL }; |
| struct child_process cmd = CHILD_PROCESS_INIT; |
| struct strbuf result = STRBUF_INIT; |
| |
| cmd.argv = argv; |
| cmd.git_cmd = 1; |
| cmd.in = fd; |
| cmd.out = -1; |
| |
| if (start_command(&cmd)) |
| die("unable to spawn mktree"); |
| |
| if (strbuf_read(&result, cmd.out, 41) < 0) |
| die_errno("unable to read from mktree"); |
| close(cmd.out); |
| |
| if (finish_command(&cmd)) |
| die("mktree reported failure"); |
| if (get_oid_hex(result.buf, oid) < 0) |
| die("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) |
| die_errno("unable to fstat %s", filename); |
| if (index_fd(oid, fd, &st, type, NULL, flags) < 0) |
| die("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. |
| */ |
| } |
| |
| static int edit_and_replace(const char *object_ref, int force, int raw) |
| { |
| char *tmpfile = git_pathdup("REPLACE_EDITOBJ"); |
| 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) |
| die("Not a valid object name: '%s'", object_ref); |
| |
| type = oid_object_info(&old_oid, NULL); |
| if (type < 0) |
| die("unable to get object type for %s", oid_to_hex(&old_oid)); |
| |
| check_ref_valid(&old_oid, &prev, &ref, force); |
| strbuf_release(&ref); |
| |
| export_object(&old_oid, type, raw, tmpfile); |
| if (launch_editor(tmpfile, NULL, NULL) < 0) |
| die("editing object file failed"); |
| import_object(&new_oid, type, raw, tmpfile); |
| |
| free(tmpfile); |
| |
| if (!oidcmp(&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 void replace_parents(struct strbuf *buf, int argc, const char **argv) |
| { |
| struct strbuf new_parents = STRBUF_INIT; |
| const char *parent_start, *parent_end; |
| int i; |
| |
| /* find existing parents */ |
| parent_start = buf->buf; |
| parent_start += GIT_SHA1_HEXSZ + 6; /* "tree " + "hex sha1" + "\n" */ |
| parent_end = parent_start; |
| |
| while (starts_with(parent_end, "parent ")) |
| parent_end += 48; /* "parent " + "hex sha1" + "\n" */ |
| |
| /* prepare new parents */ |
| for (i = 0; i < argc; i++) { |
| struct object_id oid; |
| if (get_oid(argv[i], &oid) < 0) |
| die(_("Not a valid object name: '%s'"), argv[i]); |
| lookup_commit_or_die(&oid, argv[i]); |
| strbuf_addf(&new_parents, "parent %s\n", oid_to_hex(&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); |
| } |
| |
| struct check_mergetag_data { |
| int argc; |
| const char **argv; |
| }; |
| |
| static void 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(extra->value, extra->len, type_name(OBJ_TAG), &tag_oid); |
| tag = lookup_tag(&tag_oid); |
| if (!tag) |
| die(_("bad mergetag in commit '%s'"), ref); |
| if (parse_tag_buffer(tag, extra->value, extra->len)) |
| die(_("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) |
| die(_("Not a valid object name: '%s'"), mergetag_data->argv[i]); |
| if (!oidcmp(&tag->tagged->oid, &oid)) |
| return; /* found */ |
| } |
| |
| die(_("original commit '%s' contains mergetag '%s' that is discarded; " |
| "use --edit instead of --graft"), ref, oid_to_hex(&tag_oid)); |
| } |
| |
| static void check_mergetags(struct commit *commit, int argc, const char **argv) |
| { |
| struct check_mergetag_data mergetag_data; |
| |
| mergetag_data.argc = argc; |
| mergetag_data.argv = argv; |
| for_each_mergetag(check_one_mergetag, commit, &mergetag_data); |
| } |
| |
| static int create_graft(int argc, const char **argv, int force) |
| { |
| 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) |
| die(_("Not a valid object name: '%s'"), old_ref); |
| commit = lookup_commit_or_die(&old_oid, old_ref); |
| |
| buffer = get_commit_buffer(commit, &size); |
| strbuf_add(&buf, buffer, size); |
| unuse_commit_buffer(commit, buffer); |
| |
| replace_parents(&buf, argc - 1, &argv[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!")); |
| } |
| |
| check_mergetags(commit, argc, argv); |
| |
| if (write_object_file(buf.buf, buf.len, commit_type, &new_oid)) |
| die(_("could not write replacement commit for: '%s'"), old_ref); |
| |
| strbuf_release(&buf); |
| |
| if (!oidcmp(&old_oid, &new_oid)) |
| return error("new commit is the same as the old one: '%s'", oid_to_hex(&old_oid)); |
| |
| return replace_object_oid(old_ref, &old_oid, "replacement", &new_oid, force); |
| } |
| |
| 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_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_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() |
| }; |
| |
| check_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) |
| 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); |
| |
| 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: |
| die("BUG: invalid cmdmode %d", (int)cmdmode); |
| } |
| } |