diff options
Diffstat (limited to 'builtin/reset.c')
| -rw-r--r-- | builtin/reset.c | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/builtin/reset.c b/builtin/reset.c new file mode 100644 index 0000000000..2c3a69adc6 --- /dev/null +++ b/builtin/reset.c @@ -0,0 +1,385 @@ +/* + * "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" +#include "unpack-trees.h" +#include "cache-tree.h" + +static const char * const git_reset_usage[] = { + "git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]", + "git reset [--mixed] <commit> [--] <paths>...", + NULL +}; + +enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE }; +static const char *reset_type_names[] = { + "mixed", "soft", "hard", "merge", "keep", 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 nr = 1; + int newfd; + struct tree_desc desc[2]; + struct unpack_trees_options opts; + struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); + + memset(&opts, 0, sizeof(opts)); + opts.head_idx = 1; + opts.src_index = &the_index; + opts.dst_index = &the_index; + opts.fn = oneway_merge; + opts.merge = 1; + if (!quiet) + opts.verbose_update = 1; + switch (reset_type) { + case KEEP: + case MERGE: + opts.update = 1; + break; + case HARD: + opts.update = 1; + /* fallthrough */ + default: + opts.reset = 1; + } + + newfd = hold_locked_index(lock, 1); + + read_cache_unmerged(); + + if (reset_type == KEEP) { + unsigned char head_sha1[20]; + if (get_sha1("HEAD", head_sha1)) + return error("You do not have a valid HEAD."); + if (!fill_tree_descriptor(desc, head_sha1)) + return error("Failed to find tree of HEAD."); + nr++; + opts.fn = twoway_merge; + } + + if (!fill_tree_descriptor(desc + nr - 1, sha1)) + return error("Failed to find tree of %s.", sha1_to_hex(sha1)); + if (unpack_trees(nr, desc, &opts)) + return -1; + if (write_cache(newfd, active_cache, active_nr) || + commit_locked_index(lock)) + return error("Could not write new index file."); + + return 0; +} + +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); +} + +static void die_if_unmerged_cache(int reset_type) +{ + if (is_merge() || read_cache() < 0 || unmerged_cache()) + die("Cannot do a %s reset in the middle of a merge.", + reset_type_names[reset_type]); + +} + +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__QUIET(&quiet), + 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_SET_INT(0, "keep", &reset_type, + "reset HEAD but keep local changes", KEEP), + 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 != SOFT && reset_type != MIXED) + setup_work_tree(); + + if (reset_type == MIXED && is_bare_repository()) + die("%s reset is not allowed in a bare repository", + reset_type_names[reset_type]); + + /* 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) + die_if_unmerged_cache(reset_type); + else { + int err; + if (reset_type == KEEP) + die_if_unmerged_cache(reset_type); + err = reset_index_file(sha1, reset_type, quiet); + if (reset_type == KEEP) + err = err || reset_index_file(sha1, MIXED, quiet); + if (err) + 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; +} |