mirror of
https://github.com/git/git
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![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
160 lines
3.9 KiB
C
160 lines
3.9 KiB
C
/*
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* Builtin "git replace"
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*
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* Copyright (c) 2008 Christian Couder <chriscool@tuxfamily.org>
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*
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* Based on builtin-tag.c by Kristian Høgsberg <krh@redhat.com>
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* and Carlos Rica <jasampler@gmail.com> that was itself based on
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* git-tag.sh and mktag.c by Linus Torvalds.
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "refs.h"
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#include "parse-options.h"
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static const char * const git_replace_usage[] = {
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N_("git replace [-f] <object> <replacement>"),
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N_("git replace -d <object>..."),
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N_("git replace -l [<pattern>]"),
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NULL
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};
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static int show_reference(const char *refname, const unsigned char *sha1,
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int flag, void *cb_data)
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{
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const char *pattern = cb_data;
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if (!fnmatch(pattern, refname, 0))
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printf("%s\n", refname);
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return 0;
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}
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static int list_replace_refs(const char *pattern)
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{
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if (pattern == NULL)
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pattern = "*";
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for_each_replace_ref(show_reference, (void *) pattern);
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return 0;
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}
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typedef int (*each_replace_name_fn)(const char *name, const char *ref,
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const unsigned char *sha1);
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static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
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{
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const char **p;
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char ref[PATH_MAX];
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int had_error = 0;
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unsigned char sha1[20];
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for (p = argv; *p; p++) {
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if (snprintf(ref, sizeof(ref), "refs/replace/%s", *p)
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>= sizeof(ref)) {
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error("replace ref name too long: %.*s...", 50, *p);
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had_error = 1;
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continue;
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}
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if (read_ref(ref, sha1)) {
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error("replace ref '%s' not found.", *p);
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had_error = 1;
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continue;
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}
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if (fn(*p, ref, sha1))
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had_error = 1;
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}
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return had_error;
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}
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static int delete_replace_ref(const char *name, const char *ref,
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const unsigned char *sha1)
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{
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if (delete_ref(ref, sha1, 0))
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return 1;
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printf("Deleted replace ref '%s'\n", name);
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return 0;
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}
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static int replace_object(const char *object_ref, const char *replace_ref,
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int force)
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{
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unsigned char object[20], prev[20], repl[20];
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char ref[PATH_MAX];
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struct ref_lock *lock;
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if (get_sha1(object_ref, object))
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die("Failed to resolve '%s' as a valid ref.", object_ref);
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if (get_sha1(replace_ref, repl))
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die("Failed to resolve '%s' as a valid ref.", replace_ref);
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if (snprintf(ref, sizeof(ref),
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"refs/replace/%s",
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sha1_to_hex(object)) > sizeof(ref) - 1)
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die("replace ref name too long: %.*s...", 50, ref);
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if (check_refname_format(ref, 0))
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die("'%s' is not a valid ref name.", ref);
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if (read_ref(ref, prev))
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hashclr(prev);
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else if (!force)
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die("replace ref '%s' already exists", ref);
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lock = lock_any_ref_for_update(ref, prev, 0);
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if (!lock)
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die("%s: cannot lock the ref", ref);
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if (write_ref_sha1(lock, repl, NULL) < 0)
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die("%s: cannot update the ref", ref);
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return 0;
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}
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int cmd_replace(int argc, const char **argv, const char *prefix)
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{
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int list = 0, delete = 0, force = 0;
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struct option options[] = {
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OPT_BOOLEAN('l', NULL, &list, N_("list replace refs")),
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OPT_BOOLEAN('d', NULL, &delete, N_("delete replace refs")),
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OPT_BOOLEAN('f', NULL, &force, N_("replace the ref if it exists")),
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OPT_END()
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};
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argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
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if (list && delete)
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usage_msg_opt("-l and -d cannot be used together",
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git_replace_usage, options);
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if (force && (list || delete))
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usage_msg_opt("-f cannot be used with -d or -l",
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git_replace_usage, options);
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/* Delete refs */
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if (delete) {
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if (argc < 1)
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usage_msg_opt("-d needs at least one argument",
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git_replace_usage, options);
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return for_each_replace_name(argv, delete_replace_ref);
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}
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/* Replace object */
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if (!list && argc) {
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if (argc != 2)
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usage_msg_opt("bad number of arguments",
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git_replace_usage, options);
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return replace_object(argv[0], argv[1], force);
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}
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/* List refs, even if "list" is not set */
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if (argc > 1)
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usage_msg_opt("only one pattern can be given with -l",
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git_replace_usage, options);
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if (force)
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usage_msg_opt("-f needs some arguments",
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git_replace_usage, options);
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return list_replace_refs(argv[0]);
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}
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