diff options
Diffstat (limited to 'builtin/replace.c')
| -rw-r--r-- | builtin/replace.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/builtin/replace.c b/builtin/replace.c new file mode 100644 index 000000000..b62420a01 --- /dev/null +++ b/builtin/replace.c @@ -0,0 +1,225 @@ +/* + * 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 [--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 unsigned char *sha1, + int flag, void *cb_data) +{ + struct show_data *data = cb_data; + + if (!wildmatch(data->pattern, refname, 0, NULL)) { + if (data->format == REPLACE_FORMAT_SHORT) + printf("%s\n", refname); + else if (data->format == REPLACE_FORMAT_MEDIUM) + printf("%s -> %s\n", refname, sha1_to_hex(sha1)); + else { /* data->format == REPLACE_FORMAT_LONG */ + unsigned char object[20]; + enum object_type obj_type, repl_type; + + if (get_sha1(refname, object)) + return error("Failed to resolve '%s' as a valid ref.", refname); + + obj_type = sha1_object_info(object, NULL); + repl_type = sha1_object_info(sha1, NULL); + + printf("%s (%s) -> %s (%s)\n", refname, typename(obj_type), + sha1_to_hex(sha1), typename(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 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]; + enum object_type obj_type, repl_type; + 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); + + obj_type = sha1_object_info(object, NULL); + repl_type = sha1_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, typename(obj_type), + replace_ref, typename(repl_type)); + + 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, NULL); + 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; + const char *format = NULL; + struct option options[] = { + OPT_BOOL('l', "list", &list, N_("list replace refs")), + OPT_BOOL('d', "delete", &delete, N_("delete replace refs")), + OPT_BOOL('f', "force", &force, N_("replace the ref if it exists")), + OPT_STRING(0, "format", &format, N_("format"), N_("use this format")), + OPT_END() + }; + + check_replace_refs = 0; + + 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 (format && delete) + usage_msg_opt("--format 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); + if (format) + usage_msg_opt("--format cannot be used when not listing", + 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], format); +} |