mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
370 lines
9.8 KiB
C
370 lines
9.8 KiB
C
/*
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* "git reset" builtin command
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*
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* Copyright (c) 2007 Carlos Rica
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*
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* Based on git-reset.sh, which is
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*
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* Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
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*/
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#include "builtin.h"
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#include "tag.h"
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#include "object.h"
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#include "commit.h"
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#include "run-command.h"
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#include "refs.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "tree.h"
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#include "branch.h"
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#include "parse-options.h"
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#include "unpack-trees.h"
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#include "cache-tree.h"
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static const char * const git_reset_usage[] = {
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"git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]",
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"git reset [-q] <commit> [--] <paths>...",
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"git reset --patch [<commit>] [--] [<paths>...]",
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NULL
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};
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enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
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static const char *reset_type_names[] = {
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N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
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};
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static inline int is_merge(void)
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{
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return !access(git_path("MERGE_HEAD"), F_OK);
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}
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static int reset_index_file(const unsigned char *sha1, int reset_type, int quiet)
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{
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int nr = 1;
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int newfd;
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struct tree_desc desc[2];
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struct unpack_trees_options opts;
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struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = 1;
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opts.src_index = &the_index;
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opts.dst_index = &the_index;
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opts.fn = oneway_merge;
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opts.merge = 1;
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if (!quiet)
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opts.verbose_update = 1;
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switch (reset_type) {
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case KEEP:
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case MERGE:
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opts.update = 1;
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break;
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case HARD:
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opts.update = 1;
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/* fallthrough */
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default:
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opts.reset = 1;
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}
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newfd = hold_locked_index(lock, 1);
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read_cache_unmerged();
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if (reset_type == KEEP) {
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unsigned char head_sha1[20];
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if (get_sha1("HEAD", head_sha1))
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return error(_("You do not have a valid HEAD."));
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if (!fill_tree_descriptor(desc, head_sha1))
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return error(_("Failed to find tree of HEAD."));
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nr++;
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opts.fn = twoway_merge;
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}
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if (!fill_tree_descriptor(desc + nr - 1, sha1))
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return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
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if (unpack_trees(nr, desc, &opts))
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return -1;
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if (write_cache(newfd, active_cache, active_nr) ||
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commit_locked_index(lock))
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return error(_("Could not write new index file."));
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return 0;
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}
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static void print_new_head_line(struct commit *commit)
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{
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const char *hex, *body;
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hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
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printf(_("HEAD is now at %s"), hex);
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body = strstr(commit->buffer, "\n\n");
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if (body) {
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const char *eol;
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size_t len;
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body += 2;
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eol = strchr(body, '\n');
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len = eol ? eol - body : strlen(body);
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printf(" %.*s\n", (int) len, body);
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}
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else
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printf("\n");
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}
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static int update_index_refresh(int fd, struct lock_file *index_lock, int flags)
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{
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int result;
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if (!index_lock) {
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index_lock = xcalloc(1, sizeof(struct lock_file));
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fd = hold_locked_index(index_lock, 1);
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}
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if (read_cache() < 0)
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return error(_("Could not read index"));
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result = refresh_index(&the_index, (flags), NULL, NULL,
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_("Unstaged changes after reset:")) ? 1 : 0;
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if (write_cache(fd, active_cache, active_nr) ||
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commit_locked_index(index_lock))
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return error ("Could not refresh index");
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return result;
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}
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static void update_index_from_diff(struct diff_queue_struct *q,
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struct diff_options *opt, void *data)
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{
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int i;
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int *discard_flag = data;
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/* do_diff_cache() mangled the index */
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discard_cache();
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*discard_flag = 1;
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read_cache();
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for (i = 0; i < q->nr; i++) {
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struct diff_filespec *one = q->queue[i]->one;
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if (one->mode && !is_null_sha1(one->sha1)) {
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struct cache_entry *ce;
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ce = make_cache_entry(one->mode, one->sha1, one->path,
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0, 0);
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if (!ce)
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die(_("make_cache_entry failed for path '%s'"),
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one->path);
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add_cache_entry(ce, ADD_CACHE_OK_TO_ADD |
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ADD_CACHE_OK_TO_REPLACE);
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} else
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remove_file_from_cache(one->path);
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}
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}
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static int interactive_reset(const char *revision, const char **argv,
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const char *prefix)
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{
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const char **pathspec = NULL;
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if (*argv)
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pathspec = get_pathspec(prefix, argv);
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return run_add_interactive(revision, "--patch=reset", pathspec);
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}
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static int read_from_tree(const char *prefix, const char **argv,
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unsigned char *tree_sha1, int refresh_flags)
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{
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struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
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int index_fd, index_was_discarded = 0;
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struct diff_options opt;
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memset(&opt, 0, sizeof(opt));
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diff_tree_setup_paths(get_pathspec(prefix, (const char **)argv), &opt);
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opt.output_format = DIFF_FORMAT_CALLBACK;
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opt.format_callback = update_index_from_diff;
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opt.format_callback_data = &index_was_discarded;
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index_fd = hold_locked_index(lock, 1);
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index_was_discarded = 0;
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read_cache();
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if (do_diff_cache(tree_sha1, &opt))
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return 1;
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diffcore_std(&opt);
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diff_flush(&opt);
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diff_tree_release_paths(&opt);
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if (!index_was_discarded)
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/* The index is still clobbered from do_diff_cache() */
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discard_cache();
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return update_index_refresh(index_fd, lock, refresh_flags);
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}
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static void set_reflog_message(struct strbuf *sb, const char *action,
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const char *rev)
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{
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const char *rla = getenv("GIT_REFLOG_ACTION");
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strbuf_reset(sb);
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if (rla)
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strbuf_addf(sb, "%s: %s", rla, action);
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else if (rev)
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strbuf_addf(sb, "reset: moving to %s", rev);
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else
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strbuf_addf(sb, "reset: %s", action);
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}
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static void die_if_unmerged_cache(int reset_type)
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{
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if (is_merge() || read_cache() < 0 || unmerged_cache())
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die(_("Cannot do a %s reset in the middle of a merge."),
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_(reset_type_names[reset_type]));
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}
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int cmd_reset(int argc, const char **argv, const char *prefix)
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{
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int i = 0, reset_type = NONE, update_ref_status = 0, quiet = 0;
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int patch_mode = 0;
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const char *rev = "HEAD";
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unsigned char sha1[20], *orig = NULL, sha1_orig[20],
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*old_orig = NULL, sha1_old_orig[20];
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struct commit *commit;
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struct strbuf msg = STRBUF_INIT;
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const struct option options[] = {
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OPT__QUIET(&quiet, "be quiet, only report errors"),
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OPT_SET_INT(0, "mixed", &reset_type,
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"reset HEAD and index", MIXED),
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OPT_SET_INT(0, "soft", &reset_type, "reset only HEAD", SOFT),
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OPT_SET_INT(0, "hard", &reset_type,
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"reset HEAD, index and working tree", HARD),
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OPT_SET_INT(0, "merge", &reset_type,
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"reset HEAD, index and working tree", MERGE),
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OPT_SET_INT(0, "keep", &reset_type,
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"reset HEAD but keep local changes", KEEP),
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OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"),
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, git_reset_usage,
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PARSE_OPT_KEEP_DASHDASH);
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/*
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* Possible arguments are:
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*
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* git reset [-opts] <rev> <paths>...
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* git reset [-opts] <rev> -- <paths>...
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* git reset [-opts] -- <paths>...
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* git reset [-opts] <paths>...
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*
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* At this point, argv[i] points immediately after [-opts].
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*/
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if (i < argc) {
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if (!strcmp(argv[i], "--")) {
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i++; /* reset to HEAD, possibly with paths */
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} else if (i + 1 < argc && !strcmp(argv[i+1], "--")) {
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rev = argv[i];
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i += 2;
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}
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/*
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* Otherwise, argv[i] could be either <rev> or <paths> and
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* has to be unambiguous.
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*/
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else if (!get_sha1(argv[i], sha1)) {
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/*
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* Ok, argv[i] looks like a rev; it should not
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* be a filename.
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*/
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verify_non_filename(prefix, argv[i]);
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rev = argv[i++];
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} else {
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/* Otherwise we treat this as a filename */
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verify_filename(prefix, argv[i]);
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}
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}
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if (get_sha1(rev, sha1))
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die(_("Failed to resolve '%s' as a valid ref."), rev);
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commit = lookup_commit_reference(sha1);
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if (!commit)
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die(_("Could not parse object '%s'."), rev);
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hashcpy(sha1, commit->object.sha1);
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if (patch_mode) {
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if (reset_type != NONE)
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die(_("--patch is incompatible with --{hard,mixed,soft}"));
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return interactive_reset(rev, argv + i, prefix);
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}
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/* git reset tree [--] paths... can be used to
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* load chosen paths from the tree into the index without
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* affecting the working tree nor HEAD. */
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if (i < argc) {
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if (reset_type == MIXED)
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warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
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else if (reset_type != NONE)
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die(_("Cannot do %s reset with paths."),
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_(reset_type_names[reset_type]));
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return read_from_tree(prefix, argv + i, sha1,
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quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN);
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}
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if (reset_type == NONE)
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reset_type = MIXED; /* by default */
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if (reset_type != SOFT && reset_type != MIXED)
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setup_work_tree();
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if (reset_type == MIXED && is_bare_repository())
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die(_("%s reset is not allowed in a bare repository"),
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_(reset_type_names[reset_type]));
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/* Soft reset does not touch the index file nor the working tree
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* at all, but requires them in a good order. Other resets reset
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* the index file to the tree object we are switching to. */
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if (reset_type == SOFT)
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die_if_unmerged_cache(reset_type);
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else {
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int err;
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if (reset_type == KEEP)
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die_if_unmerged_cache(reset_type);
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err = reset_index_file(sha1, reset_type, quiet);
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if (reset_type == KEEP)
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err = err || reset_index_file(sha1, MIXED, quiet);
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if (err)
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die(_("Could not reset index file to revision '%s'."), rev);
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}
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/* Any resets update HEAD to the head being switched to,
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* saving the previous head in ORIG_HEAD before. */
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if (!get_sha1("ORIG_HEAD", sha1_old_orig))
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old_orig = sha1_old_orig;
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if (!get_sha1("HEAD", sha1_orig)) {
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orig = sha1_orig;
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set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
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update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0, MSG_ON_ERR);
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}
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else if (old_orig)
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delete_ref("ORIG_HEAD", old_orig, 0);
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set_reflog_message(&msg, "updating HEAD", rev);
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update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0, MSG_ON_ERR);
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switch (reset_type) {
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case HARD:
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if (!update_ref_status && !quiet)
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print_new_head_line(commit);
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break;
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case SOFT: /* Nothing else to do. */
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break;
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case MIXED: /* Report what has not been updated. */
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update_index_refresh(0, NULL,
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quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN);
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break;
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}
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remove_branch_state();
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strbuf_release(&msg);
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return update_ref_status;
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}
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