mirror of
https://github.com/git/git
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280 lines
6.8 KiB
C
280 lines
6.8 KiB
C
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/*
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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 "cache.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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static const char builtin_reset_usage[] =
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"git-reset [--mixed | --soft | --hard] [<commit-ish>] [ [--] <paths>...]";
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static char *args_to_str(const char **argv)
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{
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char *buf = NULL;
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unsigned long len, space = 0, nr = 0;
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for (; *argv; argv++) {
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len = strlen(*argv);
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ALLOC_GROW(buf, nr + 1 + len, space);
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if (nr)
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buf[nr++] = ' ';
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memcpy(buf + nr, *argv, len);
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nr += len;
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}
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ALLOC_GROW(buf, nr + 1, space);
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buf[nr] = '\0';
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return buf;
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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 unmerged_files(void)
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{
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char b;
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ssize_t len;
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struct child_process cmd;
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const char *argv_ls_files[] = {"ls-files", "--unmerged", NULL};
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memset(&cmd, 0, sizeof(cmd));
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cmd.argv = argv_ls_files;
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cmd.git_cmd = 1;
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cmd.out = -1;
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if (start_command(&cmd))
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die("Could not run sub-command: git ls-files");
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len = xread(cmd.out, &b, 1);
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if (len < 0)
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die("Could not read output from git ls-files: %s",
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strerror(errno));
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finish_command(&cmd);
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return len;
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}
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static int reset_index_file(const unsigned char *sha1, int is_hard_reset)
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{
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int i = 0;
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const char *args[6];
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args[i++] = "read-tree";
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args[i++] = "-v";
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args[i++] = "--reset";
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if (is_hard_reset)
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args[i++] = "-u";
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args[i++] = sha1_to_hex(sha1);
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args[i] = NULL;
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return run_command_v_opt(args, RUN_GIT_CMD);
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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, *dots = "...", *body;
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hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
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if (!hex) {
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hex = sha1_to_hex(commit->object.sha1);
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dots = "";
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}
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printf("HEAD is now at %s%s", hex, dots);
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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(void)
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{
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const char *argv_update_index[] = {"update-index", "--refresh", NULL};
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return run_command_v_opt(argv_update_index, RUN_GIT_CMD);
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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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/* do_diff_cache() mangled the index */
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discard_cache();
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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) {
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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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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 read_from_tree(const char *prefix, const char **argv,
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unsigned char *tree_sha1)
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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;
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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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index_fd = hold_locked_index(lock, 1);
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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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return write_cache(index_fd, active_cache, active_nr) ||
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close(index_fd) ||
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commit_locked_index(lock);
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}
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static void prepend_reflog_action(const char *action, char *buf, size_t size)
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{
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const char *sep = ": ";
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const char *rla = getenv("GIT_REFLOG_ACTION");
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if (!rla)
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rla = sep = "";
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if (snprintf(buf, size, "%s%s%s", rla, sep, action) >= size)
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warning("Reflog action message too long: %.*s...", 50, buf);
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}
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enum reset_type { MIXED, SOFT, HARD, NONE };
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static char *reset_type_names[] = { "mixed", "soft", "hard", NULL };
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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 = 1, reset_type = NONE, update_ref_status = 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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char *reflog_action, msg[1024];
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git_config(git_default_config);
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reflog_action = args_to_str(argv);
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setenv("GIT_REFLOG_ACTION", reflog_action, 0);
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if (i < argc) {
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if (!strcmp(argv[i], "--mixed")) {
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reset_type = MIXED;
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i++;
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}
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else if (!strcmp(argv[i], "--soft")) {
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reset_type = SOFT;
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i++;
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}
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else if (!strcmp(argv[i], "--hard")) {
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reset_type = HARD;
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i++;
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}
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}
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if (i < argc && argv[i][0] != '-')
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rev = argv[i++];
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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 (i < argc && !strcmp(argv[i], "--"))
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i++;
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else if (i < argc && argv[i][0] == '-')
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usage(builtin_reset_usage);
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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 option is deprecated with paths.");
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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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if (read_from_tree(prefix, argv + i, sha1))
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return 1;
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return update_index_refresh() ? 1 : 0;
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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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/* 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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if (is_merge() || unmerged_files())
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die("Cannot do a soft reset in the middle of a merge.");
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}
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else if (reset_index_file(sha1, (reset_type == HARD)))
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die("Could not reset index file to revision '%s'.", rev);
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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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prepend_reflog_action("updating ORIG_HEAD", msg, sizeof(msg));
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update_ref(msg, "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);
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prepend_reflog_action("updating HEAD", msg, sizeof(msg));
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update_ref_status = update_ref(msg, "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)
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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();
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break;
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}
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unlink(git_path("MERGE_HEAD"));
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unlink(git_path("rr-cache/MERGE_RR"));
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unlink(git_path("MERGE_MSG"));
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unlink(git_path("SQUASH_MSG"));
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free(reflog_action);
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return update_ref_status;
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}
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