| /* |
| * "git reset" builtin command |
| * |
| * Copyright (c) 2007 Carlos Rica |
| * |
| * Based on git-reset.sh, which is |
| * |
| * Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano |
| */ |
| #include "cache.h" |
| #include "tag.h" |
| #include "object.h" |
| #include "commit.h" |
| #include "run-command.h" |
| #include "refs.h" |
| #include "diff.h" |
| #include "diffcore.h" |
| #include "tree.h" |
| #include "branch.h" |
| #include "parse-options.h" |
| |
| static const char * const git_reset_usage[] = { |
| "git reset [--mixed | --soft | --hard | --merge] [-q] [<commit>]", |
| "git reset [--mixed] <commit> [--] <paths>...", |
| NULL |
| }; |
| |
| enum reset_type { MIXED, SOFT, HARD, MERGE, NONE }; |
| static const char *reset_type_names[] = { "mixed", "soft", "hard", "merge", NULL }; |
| |
| static char *args_to_str(const char **argv) |
| { |
| char *buf = NULL; |
| unsigned long len, space = 0, nr = 0; |
| |
| for (; *argv; argv++) { |
| len = strlen(*argv); |
| ALLOC_GROW(buf, nr + 1 + len, space); |
| if (nr) |
| buf[nr++] = ' '; |
| memcpy(buf + nr, *argv, len); |
| nr += len; |
| } |
| ALLOC_GROW(buf, nr + 1, space); |
| buf[nr] = '\0'; |
| |
| return buf; |
| } |
| |
| static inline int is_merge(void) |
| { |
| return !access(git_path("MERGE_HEAD"), F_OK); |
| } |
| |
| static int reset_index_file(const unsigned char *sha1, int reset_type, int quiet) |
| { |
| int i = 0; |
| const char *args[6]; |
| |
| args[i++] = "read-tree"; |
| if (!quiet) |
| args[i++] = "-v"; |
| switch (reset_type) { |
| case MERGE: |
| args[i++] = "-u"; |
| args[i++] = "-m"; |
| break; |
| case HARD: |
| args[i++] = "-u"; |
| /* fallthrough */ |
| default: |
| args[i++] = "--reset"; |
| } |
| args[i++] = sha1_to_hex(sha1); |
| args[i] = NULL; |
| |
| return run_command_v_opt(args, RUN_GIT_CMD); |
| } |
| |
| static void print_new_head_line(struct commit *commit) |
| { |
| const char *hex, *body; |
| |
| hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV); |
| printf("HEAD is now at %s", hex); |
| body = strstr(commit->buffer, "\n\n"); |
| if (body) { |
| const char *eol; |
| size_t len; |
| body += 2; |
| eol = strchr(body, '\n'); |
| len = eol ? eol - body : strlen(body); |
| printf(" %.*s\n", (int) len, body); |
| } |
| else |
| printf("\n"); |
| } |
| |
| static int update_index_refresh(int fd, struct lock_file *index_lock, int flags) |
| { |
| int result; |
| |
| if (!index_lock) { |
| index_lock = xcalloc(1, sizeof(struct lock_file)); |
| fd = hold_locked_index(index_lock, 1); |
| } |
| |
| if (read_cache() < 0) |
| return error("Could not read index"); |
| |
| result = refresh_index(&the_index, (flags), NULL, NULL, |
| "Unstaged changes after reset:") ? 1 : 0; |
| if (write_cache(fd, active_cache, active_nr) || |
| commit_locked_index(index_lock)) |
| return error ("Could not refresh index"); |
| return result; |
| } |
| |
| static void update_index_from_diff(struct diff_queue_struct *q, |
| struct diff_options *opt, void *data) |
| { |
| int i; |
| int *discard_flag = data; |
| |
| /* do_diff_cache() mangled the index */ |
| discard_cache(); |
| *discard_flag = 1; |
| read_cache(); |
| |
| for (i = 0; i < q->nr; i++) { |
| struct diff_filespec *one = q->queue[i]->one; |
| if (one->mode) { |
| struct cache_entry *ce; |
| ce = make_cache_entry(one->mode, one->sha1, one->path, |
| 0, 0); |
| if (!ce) |
| die("make_cache_entry failed for path '%s'", |
| one->path); |
| add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | |
| ADD_CACHE_OK_TO_REPLACE); |
| } else |
| remove_file_from_cache(one->path); |
| } |
| } |
| |
| static int interactive_reset(const char *revision, const char **argv, |
| const char *prefix) |
| { |
| const char **pathspec = NULL; |
| |
| if (*argv) |
| pathspec = get_pathspec(prefix, argv); |
| |
| return run_add_interactive(revision, "--patch=reset", pathspec); |
| } |
| |
| static int read_from_tree(const char *prefix, const char **argv, |
| unsigned char *tree_sha1, int refresh_flags) |
| { |
| struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); |
| int index_fd, index_was_discarded = 0; |
| struct diff_options opt; |
| |
| memset(&opt, 0, sizeof(opt)); |
| diff_tree_setup_paths(get_pathspec(prefix, (const char **)argv), &opt); |
| opt.output_format = DIFF_FORMAT_CALLBACK; |
| opt.format_callback = update_index_from_diff; |
| opt.format_callback_data = &index_was_discarded; |
| |
| index_fd = hold_locked_index(lock, 1); |
| index_was_discarded = 0; |
| read_cache(); |
| if (do_diff_cache(tree_sha1, &opt)) |
| return 1; |
| diffcore_std(&opt); |
| diff_flush(&opt); |
| diff_tree_release_paths(&opt); |
| |
| if (!index_was_discarded) |
| /* The index is still clobbered from do_diff_cache() */ |
| discard_cache(); |
| return update_index_refresh(index_fd, lock, refresh_flags); |
| } |
| |
| static void prepend_reflog_action(const char *action, char *buf, size_t size) |
| { |
| const char *sep = ": "; |
| const char *rla = getenv("GIT_REFLOG_ACTION"); |
| if (!rla) |
| rla = sep = ""; |
| if (snprintf(buf, size, "%s%s%s", rla, sep, action) >= size) |
| warning("Reflog action message too long: %.*s...", 50, buf); |
| } |
| |
| int cmd_reset(int argc, const char **argv, const char *prefix) |
| { |
| int i = 0, reset_type = NONE, update_ref_status = 0, quiet = 0; |
| int patch_mode = 0; |
| const char *rev = "HEAD"; |
| unsigned char sha1[20], *orig = NULL, sha1_orig[20], |
| *old_orig = NULL, sha1_old_orig[20]; |
| struct commit *commit; |
| char *reflog_action, msg[1024]; |
| const struct option options[] = { |
| OPT_SET_INT(0, "mixed", &reset_type, |
| "reset HEAD and index", MIXED), |
| OPT_SET_INT(0, "soft", &reset_type, "reset only HEAD", SOFT), |
| OPT_SET_INT(0, "hard", &reset_type, |
| "reset HEAD, index and working tree", HARD), |
| OPT_SET_INT(0, "merge", &reset_type, |
| "reset HEAD, index and working tree", MERGE), |
| OPT_BOOLEAN('q', NULL, &quiet, |
| "disable showing new HEAD in hard reset and progress message"), |
| OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"), |
| OPT_END() |
| }; |
| |
| git_config(git_default_config, NULL); |
| |
| argc = parse_options(argc, argv, prefix, options, git_reset_usage, |
| PARSE_OPT_KEEP_DASHDASH); |
| reflog_action = args_to_str(argv); |
| setenv("GIT_REFLOG_ACTION", reflog_action, 0); |
| |
| /* |
| * Possible arguments are: |
| * |
| * git reset [-opts] <rev> <paths>... |
| * git reset [-opts] <rev> -- <paths>... |
| * git reset [-opts] -- <paths>... |
| * git reset [-opts] <paths>... |
| * |
| * At this point, argv[i] points immediately after [-opts]. |
| */ |
| |
| if (i < argc) { |
| if (!strcmp(argv[i], "--")) { |
| i++; /* reset to HEAD, possibly with paths */ |
| } else if (i + 1 < argc && !strcmp(argv[i+1], "--")) { |
| rev = argv[i]; |
| i += 2; |
| } |
| /* |
| * Otherwise, argv[i] could be either <rev> or <paths> and |
| * has to be unambiguous. |
| */ |
| else if (!get_sha1(argv[i], sha1)) { |
| /* |
| * Ok, argv[i] looks like a rev; it should not |
| * be a filename. |
| */ |
| verify_non_filename(prefix, argv[i]); |
| rev = argv[i++]; |
| } else { |
| /* Otherwise we treat this as a filename */ |
| verify_filename(prefix, argv[i]); |
| } |
| } |
| |
| if (get_sha1(rev, sha1)) |
| die("Failed to resolve '%s' as a valid ref.", rev); |
| |
| commit = lookup_commit_reference(sha1); |
| if (!commit) |
| die("Could not parse object '%s'.", rev); |
| hashcpy(sha1, commit->object.sha1); |
| |
| if (patch_mode) { |
| if (reset_type != NONE) |
| die("--patch is incompatible with --{hard,mixed,soft}"); |
| return interactive_reset(rev, argv + i, prefix); |
| } |
| |
| /* git reset tree [--] paths... can be used to |
| * load chosen paths from the tree into the index without |
| * affecting the working tree nor HEAD. */ |
| if (i < argc) { |
| if (reset_type == MIXED) |
| warning("--mixed option is deprecated with paths."); |
| else if (reset_type != NONE) |
| die("Cannot do %s reset with paths.", |
| reset_type_names[reset_type]); |
| return read_from_tree(prefix, argv + i, sha1, |
| quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN); |
| } |
| if (reset_type == NONE) |
| reset_type = MIXED; /* by default */ |
| |
| if (reset_type == HARD && is_bare_repository()) |
| die("hard reset makes no sense in a bare repository"); |
| |
| /* Soft reset does not touch the index file nor the working tree |
| * at all, but requires them in a good order. Other resets reset |
| * the index file to the tree object we are switching to. */ |
| if (reset_type == SOFT) { |
| if (is_merge() || read_cache() < 0 || unmerged_cache()) |
| die("Cannot do a soft reset in the middle of a merge."); |
| } |
| else if (reset_index_file(sha1, reset_type, quiet)) |
| die("Could not reset index file to revision '%s'.", rev); |
| |
| /* Any resets update HEAD to the head being switched to, |
| * saving the previous head in ORIG_HEAD before. */ |
| if (!get_sha1("ORIG_HEAD", sha1_old_orig)) |
| old_orig = sha1_old_orig; |
| if (!get_sha1("HEAD", sha1_orig)) { |
| orig = sha1_orig; |
| prepend_reflog_action("updating ORIG_HEAD", msg, sizeof(msg)); |
| update_ref(msg, "ORIG_HEAD", orig, old_orig, 0, MSG_ON_ERR); |
| } |
| else if (old_orig) |
| delete_ref("ORIG_HEAD", old_orig, 0); |
| prepend_reflog_action("updating HEAD", msg, sizeof(msg)); |
| update_ref_status = update_ref(msg, "HEAD", sha1, orig, 0, MSG_ON_ERR); |
| |
| switch (reset_type) { |
| case HARD: |
| if (!update_ref_status && !quiet) |
| print_new_head_line(commit); |
| break; |
| case SOFT: /* Nothing else to do. */ |
| break; |
| case MIXED: /* Report what has not been updated. */ |
| update_index_refresh(0, NULL, |
| quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN); |
| break; |
| } |
| |
| remove_branch_state(); |
| |
| free(reflog_action); |
| |
| return update_ref_status; |
| } |