c5bcf1f9f6
As resolve_ref() returns a static buffer that is local to the function, the caller needs to be sure that it will not have any other calls to the function before it uses the returned value, or store it away with a strdup(). The code used old.path to record which branch it used to be on, so that it can say between which branches the switch took place in the reflog, but sometimes it failed to do so. Signed-off-by: Junio C Hamano <gitster@pobox.com>
480 lines
12 KiB
C
480 lines
12 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "parse-options.h"
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#include "refs.h"
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#include "commit.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "unpack-trees.h"
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#include "dir.h"
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#include "run-command.h"
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#include "merge-recursive.h"
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#include "branch.h"
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#include "diff.h"
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#include "revision.h"
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static const char * const checkout_usage[] = {
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"git checkout [options] <branch>",
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"git checkout [options] [<branch>] -- <file>...",
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NULL,
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};
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static int post_checkout_hook(struct commit *old, struct commit *new,
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int changed)
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{
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struct child_process proc;
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const char *name = git_path("hooks/post-checkout");
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const char *argv[5];
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if (access(name, X_OK) < 0)
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return 0;
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memset(&proc, 0, sizeof(proc));
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argv[0] = name;
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argv[1] = xstrdup(sha1_to_hex(old->object.sha1));
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argv[2] = xstrdup(sha1_to_hex(new->object.sha1));
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argv[3] = changed ? "1" : "0";
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argv[4] = NULL;
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proc.argv = argv;
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proc.no_stdin = 1;
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proc.stdout_to_stderr = 1;
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return run_command(&proc);
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}
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static int update_some(const unsigned char *sha1, const char *base, int baselen,
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const char *pathname, unsigned mode, int stage)
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{
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int len;
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struct cache_entry *ce;
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if (S_ISGITLINK(mode))
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return 0;
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if (S_ISDIR(mode))
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return READ_TREE_RECURSIVE;
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len = baselen + strlen(pathname);
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ce = xcalloc(1, cache_entry_size(len));
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hashcpy(ce->sha1, sha1);
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memcpy(ce->name, base, baselen);
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memcpy(ce->name + baselen, pathname, len - baselen);
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ce->ce_flags = create_ce_flags(len, 0);
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ce->ce_mode = create_ce_mode(mode);
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add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
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return 0;
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}
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static int read_tree_some(struct tree *tree, const char **pathspec)
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{
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int newfd;
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struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
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newfd = hold_locked_index(lock_file, 1);
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read_cache();
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read_tree_recursive(tree, "", 0, 0, pathspec, update_some);
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if (write_cache(newfd, active_cache, active_nr) ||
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commit_locked_index(lock_file))
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die("unable to write new index file");
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/* update the index with the given tree's info
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* for all args, expanding wildcards, and exit
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* with any non-zero return code.
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*/
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return 0;
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}
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static int checkout_paths(const char **pathspec)
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{
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int pos;
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struct checkout state;
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static char *ps_matched;
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unsigned char rev[20];
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int flag;
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struct commit *head;
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for (pos = 0; pathspec[pos]; pos++)
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;
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ps_matched = xcalloc(1, pos);
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for (pos = 0; pos < active_nr; pos++) {
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struct cache_entry *ce = active_cache[pos];
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pathspec_match(pathspec, ps_matched, ce->name, 0);
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}
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if (report_path_error(ps_matched, pathspec, 0))
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return 1;
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memset(&state, 0, sizeof(state));
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state.force = 1;
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state.refresh_cache = 1;
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for (pos = 0; pos < active_nr; pos++) {
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struct cache_entry *ce = active_cache[pos];
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if (pathspec_match(pathspec, NULL, ce->name, 0)) {
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checkout_entry(ce, &state, NULL);
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}
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}
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resolve_ref("HEAD", rev, 0, &flag);
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head = lookup_commit_reference_gently(rev, 1);
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return post_checkout_hook(head, head, 0);
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}
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static void show_local_changes(struct object *head)
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{
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struct rev_info rev;
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/* I think we want full paths, even if we're in a subdirectory. */
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init_revisions(&rev, NULL);
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rev.abbrev = 0;
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rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
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add_pending_object(&rev, head, NULL);
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run_diff_index(&rev, 0);
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}
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static void describe_detached_head(char *msg, struct commit *commit)
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{
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struct strbuf sb;
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strbuf_init(&sb, 0);
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parse_commit(commit);
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pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, 0, "", "", 0, 0);
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fprintf(stderr, "%s %s... %s\n", msg,
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find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf);
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strbuf_release(&sb);
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}
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static int reset_to_new(struct tree *tree, int quiet)
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{
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struct unpack_trees_options opts;
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struct tree_desc tree_desc;
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = -1;
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opts.update = 1;
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opts.reset = 1;
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opts.merge = 1;
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opts.fn = oneway_merge;
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opts.verbose_update = !quiet;
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parse_tree(tree);
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init_tree_desc(&tree_desc, tree->buffer, tree->size);
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if (unpack_trees(1, &tree_desc, &opts))
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return 128;
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return 0;
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}
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static void reset_clean_to_new(struct tree *tree, int quiet)
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{
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struct unpack_trees_options opts;
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struct tree_desc tree_desc;
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = -1;
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opts.skip_unmerged = 1;
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opts.reset = 1;
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opts.merge = 1;
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opts.fn = oneway_merge;
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opts.verbose_update = !quiet;
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parse_tree(tree);
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init_tree_desc(&tree_desc, tree->buffer, tree->size);
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if (unpack_trees(1, &tree_desc, &opts))
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exit(128);
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}
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struct checkout_opts {
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int quiet;
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int merge;
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int force;
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char *new_branch;
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int new_branch_log;
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int track;
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};
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struct branch_info {
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const char *name; /* The short name used */
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const char *path; /* The full name of a real branch */
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struct commit *commit; /* The named commit */
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};
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static void setup_branch_path(struct branch_info *branch)
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{
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struct strbuf buf;
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strbuf_init(&buf, 0);
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strbuf_addstr(&buf, "refs/heads/");
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strbuf_addstr(&buf, branch->name);
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branch->path = strbuf_detach(&buf, NULL);
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}
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static int merge_working_tree(struct checkout_opts *opts,
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struct branch_info *old, struct branch_info *new,
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const char *prefix)
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{
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int ret;
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struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
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int newfd = hold_locked_index(lock_file, 1);
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read_cache();
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if (opts->force) {
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ret = reset_to_new(new->commit->tree, opts->quiet);
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if (ret)
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return ret;
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} else {
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struct tree_desc trees[2];
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struct tree *tree;
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struct unpack_trees_options topts;
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memset(&topts, 0, sizeof(topts));
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topts.head_idx = -1;
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refresh_cache(REFRESH_QUIET);
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if (unmerged_cache()) {
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ret = opts->merge ? -1 :
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error("you need to resolve your current index first");
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} else {
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topts.update = 1;
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topts.merge = 1;
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topts.gently = opts->merge;
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topts.fn = twoway_merge;
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topts.dir = xcalloc(1, sizeof(*topts.dir));
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topts.dir->show_ignored = 1;
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topts.dir->exclude_per_dir = ".gitignore";
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topts.prefix = prefix;
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tree = parse_tree_indirect(old->commit->object.sha1);
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init_tree_desc(&trees[0], tree->buffer, tree->size);
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tree = parse_tree_indirect(new->commit->object.sha1);
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init_tree_desc(&trees[1], tree->buffer, tree->size);
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ret = unpack_trees(2, trees, &topts);
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}
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if (ret) {
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/*
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* Unpack couldn't do a trivial merge; either
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* give up or do a real merge, depending on
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* whether the merge flag was used.
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*/
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struct tree *result;
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struct tree *work;
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if (!opts->merge)
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return 1;
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parse_commit(old->commit);
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/* Do more real merge */
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/*
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* We update the index fully, then write the
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* tree from the index, then merge the new
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* branch with the current tree, with the old
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* branch as the base. Then we reset the index
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* (but not the working tree) to the new
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* branch, leaving the working tree as the
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* merged version, but skipping unmerged
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* entries in the index.
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*/
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add_files_to_cache(0, NULL, NULL);
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work = write_tree_from_memory();
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ret = reset_to_new(new->commit->tree, opts->quiet);
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if (ret)
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return ret;
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merge_trees(new->commit->tree, work, old->commit->tree,
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new->name, "local", &result);
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reset_clean_to_new(new->commit->tree, opts->quiet);
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}
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}
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if (write_cache(newfd, active_cache, active_nr) ||
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commit_locked_index(lock_file))
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die("unable to write new index file");
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if (!opts->force)
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show_local_changes(&new->commit->object);
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return 0;
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}
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static void update_refs_for_switch(struct checkout_opts *opts,
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struct branch_info *old,
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struct branch_info *new)
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{
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struct strbuf msg;
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const char *old_desc;
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if (opts->new_branch) {
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create_branch(old->name, opts->new_branch, new->name, 0,
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opts->new_branch_log, opts->track);
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new->name = opts->new_branch;
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setup_branch_path(new);
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}
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strbuf_init(&msg, 0);
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old_desc = old->name;
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if (!old_desc)
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old_desc = sha1_to_hex(old->commit->object.sha1);
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strbuf_addf(&msg, "checkout: moving from %s to %s",
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old_desc, new->name);
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if (new->path) {
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create_symref("HEAD", new->path, msg.buf);
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if (!opts->quiet) {
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if (old->path && !strcmp(new->path, old->path))
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fprintf(stderr, "Already on \"%s\"\n",
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new->name);
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else
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fprintf(stderr, "Switched to%s branch \"%s\"\n",
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opts->new_branch ? " a new" : "",
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new->name);
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}
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} else if (strcmp(new->name, "HEAD")) {
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update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
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REF_NODEREF, DIE_ON_ERR);
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if (!opts->quiet) {
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if (old->path)
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fprintf(stderr, "Note: moving to \"%s\" which isn't a local branch\nIf you want to create a new branch from this checkout, you may do so\n(now or later) by using -b with the checkout command again. Example:\n git checkout -b <new_branch_name>\n", new->name);
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describe_detached_head("HEAD is now at", new->commit);
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}
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}
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remove_branch_state();
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strbuf_release(&msg);
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}
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static int switch_branches(struct checkout_opts *opts,
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struct branch_info *new, const char *prefix)
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{
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int ret = 0;
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struct branch_info old;
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unsigned char rev[20];
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int flag;
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memset(&old, 0, sizeof(old));
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old.path = xstrdup(resolve_ref("HEAD", rev, 0, &flag));
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old.commit = lookup_commit_reference_gently(rev, 1);
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if (!(flag & REF_ISSYMREF)) {
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free((char *)old.path);
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old.path = NULL;
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}
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if (old.path && !prefixcmp(old.path, "refs/heads/"))
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old.name = old.path + strlen("refs/heads/");
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if (!new->name) {
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new->name = "HEAD";
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new->commit = old.commit;
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if (!new->commit)
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die("You are on a branch yet to be born");
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parse_commit(new->commit);
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}
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/*
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* If the new thing isn't a branch and isn't HEAD and we're
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* not starting a new branch, and we want messages, and we
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* weren't on a branch, and we're moving to a new commit,
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* describe the old commit.
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*/
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if (!new->path && strcmp(new->name, "HEAD") && !opts->new_branch &&
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!opts->quiet && !old.path && new->commit != old.commit)
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describe_detached_head("Previous HEAD position was", old.commit);
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if (!old.commit) {
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if (!opts->quiet) {
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fprintf(stderr, "warning: You appear to be on a branch yet to be born.\n");
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fprintf(stderr, "warning: Forcing checkout of %s.\n", new->name);
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}
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opts->force = 1;
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}
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ret = merge_working_tree(opts, &old, new, prefix);
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if (ret)
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return ret;
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update_refs_for_switch(opts, &old, new);
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free((char *)old.path);
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return post_checkout_hook(old.commit, new->commit, 1);
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}
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static int branch_track = 0;
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static int git_checkout_config(const char *var, const char *value)
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{
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if (!strcmp(var, "branch.autosetupmerge"))
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branch_track = git_config_bool(var, value);
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return git_default_config(var, value);
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}
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int cmd_checkout(int argc, const char **argv, const char *prefix)
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{
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struct checkout_opts opts;
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unsigned char rev[20];
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const char *arg;
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struct branch_info new;
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struct tree *source_tree = NULL;
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struct option options[] = {
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OPT__QUIET(&opts.quiet),
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OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
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OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "log for new branch"),
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OPT_BOOLEAN( 0 , "track", &opts.track, "track"),
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OPT_BOOLEAN('f', NULL, &opts.force, "force"),
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OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
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};
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memset(&opts, 0, sizeof(opts));
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memset(&new, 0, sizeof(new));
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git_config(git_checkout_config);
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opts.track = branch_track;
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argc = parse_options(argc, argv, options, checkout_usage, 0);
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if (argc) {
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arg = argv[0];
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if (get_sha1(arg, rev))
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;
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else if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
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new.name = arg;
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setup_branch_path(&new);
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if (resolve_ref(new.path, rev, 1, NULL))
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new.commit = lookup_commit_reference(rev);
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else
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new.path = NULL;
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parse_commit(new.commit);
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source_tree = new.commit->tree;
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argv++;
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argc--;
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} else if ((source_tree = parse_tree_indirect(rev))) {
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argv++;
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argc--;
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}
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}
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if (argc && !strcmp(argv[0], "--")) {
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argv++;
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argc--;
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}
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if (!opts.new_branch && (opts.track != branch_track))
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die("git checkout: --track and --no-track require -b");
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if (opts.force && opts.merge)
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die("git checkout: -f and -m are incompatible");
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if (argc) {
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const char **pathspec = get_pathspec(prefix, argv);
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/* Checkout paths */
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if (opts.new_branch || opts.force || opts.merge) {
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if (argc == 1) {
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die("git checkout: updating paths is incompatible with switching branches/forcing\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]);
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} else {
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die("git checkout: updating paths is incompatible with switching branches/forcing");
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}
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}
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if (source_tree)
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read_tree_some(source_tree, pathspec);
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else
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read_cache();
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return checkout_paths(pathspec);
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}
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if (new.name && !new.commit) {
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die("Cannot switch branch to a non-commit.");
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}
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return switch_branches(&opts, &new, prefix);
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}
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