/* * 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 "builtin.h" #include "refs.h" #include "parse-options.h" static const char * const git_replace_usage[] = { N_("git replace [-f] <object> <replacement>"), N_("git replace -d <object>..."), N_("git replace -l [<pattern>]"), NULL }; static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data) { const char *pattern = cb_data; if (!fnmatch(pattern, refname, 0)) printf("%s\n", refname); return 0; } static int list_replace_refs(const char *pattern) { if (pattern == NULL) pattern = "*"; for_each_replace_ref(show_reference, (void *) pattern); return 0; } typedef int (*each_replace_name_fn)(const char *name, const char *ref, const unsigned char *sha1); static int for_each_replace_name(const char **argv, each_replace_name_fn fn) { const char **p, *full_hex; char ref[PATH_MAX]; int had_error = 0; unsigned char sha1[20]; for (p = argv; *p; p++) { if (get_sha1(*p, sha1)) { error("Failed to resolve '%s' as a valid ref.", *p); had_error = 1; continue; } full_hex = sha1_to_hex(sha1); snprintf(ref, sizeof(ref), "refs/replace/%s", full_hex); /* read_ref() may reuse the buffer */ full_hex = ref + strlen("refs/replace/"); if (read_ref(ref, sha1)) { error("replace ref '%s' not found.", full_hex); had_error = 1; continue; } if (fn(full_hex, ref, sha1)) had_error = 1; } return had_error; } static int delete_replace_ref(const char *name, const char *ref, const unsigned char *sha1) { if (delete_ref(ref, sha1, 0)) return 1; printf("Deleted replace ref '%s'\n", name); return 0; } static int replace_object(const char *object_ref, const char *replace_ref, int force) { unsigned char object[20], prev[20], repl[20]; char ref[PATH_MAX]; struct ref_lock *lock; if (get_sha1(object_ref, object)) die("Failed to resolve '%s' as a valid ref.", object_ref); if (get_sha1(replace_ref, repl)) die("Failed to resolve '%s' as a valid ref.", replace_ref); if (snprintf(ref, sizeof(ref), "refs/replace/%s", sha1_to_hex(object)) > sizeof(ref) - 1) die("replace ref name too long: %.*s...", 50, ref); if (check_refname_format(ref, 0)) die("'%s' is not a valid ref name.", ref); if (read_ref(ref, prev)) hashclr(prev); else if (!force) die("replace ref '%s' already exists", ref); lock = lock_any_ref_for_update(ref, prev, 0); if (!lock) die("%s: cannot lock the ref", ref); if (write_ref_sha1(lock, repl, NULL) < 0) die("%s: cannot update the ref", ref); return 0; } int cmd_replace(int argc, const char **argv, const char *prefix) { int list = 0, delete = 0, force = 0; struct option options[] = { OPT_BOOLEAN('l', NULL, &list, N_("list replace refs")), OPT_BOOLEAN('d', NULL, &delete, N_("delete replace refs")), OPT_BOOLEAN('f', NULL, &force, N_("replace the ref if it exists")), OPT_END() }; argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0); if (list && delete) usage_msg_opt("-l and -d cannot be used together", git_replace_usage, options); if (force && (list || delete)) usage_msg_opt("-f cannot be used with -d or -l", git_replace_usage, options); /* Delete refs */ if (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); } /* Replace object */ if (!list && argc) { if (argc != 2) usage_msg_opt("bad number of arguments", git_replace_usage, options); return replace_object(argv[0], argv[1], force); } /* List refs, even if "list" is not set */ if (argc > 1) usage_msg_opt("only one pattern can be given with -l", git_replace_usage, options); if (force) usage_msg_opt("-f needs some arguments", git_replace_usage, options); return list_replace_refs(argv[0]); }