mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
Earlier commit5521883
(checkout: do not lose staged removal, 2008-09-07) tightened the rule to prevent switching branches from losing local changes, so that staged removal of paths can be protected, while attempting to keep a loophole to still allow a special case of switching out of an un-checked-out state. However, the loophole was made a bit too tight, and did not allow switching from one branch (in an un-checked-out state) to check out another branch. The change to builtin-checkout.c in this commit loosens it to allow this, by not insisting the original commit and the new commit to be the same. It also introduces a new function, is_index_unborn (and an associated macro, is_cache_unborn), to check if the repository is truly in an un-checked-out state more reliably, by making sure that $GIT_INDEX_FILE did not exist when populating the in-core index structure. A few places the earlier commit5521883
added the check for the initial checkout condition are updated to use this function. Signed-off-by: Junio C Hamano <gitster@pobox.com>
248 lines
5.9 KiB
C
248 lines
5.9 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
|
|
#include "cache.h"
|
|
#include "object.h"
|
|
#include "tree.h"
|
|
#include "tree-walk.h"
|
|
#include "cache-tree.h"
|
|
#include "unpack-trees.h"
|
|
#include "dir.h"
|
|
#include "builtin.h"
|
|
|
|
static int nr_trees;
|
|
static struct tree *trees[MAX_UNPACK_TREES];
|
|
|
|
static int list_tree(unsigned char *sha1)
|
|
{
|
|
struct tree *tree;
|
|
|
|
if (nr_trees >= MAX_UNPACK_TREES)
|
|
die("I cannot read more than %d trees", MAX_UNPACK_TREES);
|
|
tree = parse_tree_indirect(sha1);
|
|
if (!tree)
|
|
return -1;
|
|
trees[nr_trees++] = tree;
|
|
return 0;
|
|
}
|
|
|
|
static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
|
|
{
|
|
struct tree_desc desc;
|
|
struct name_entry entry;
|
|
int cnt;
|
|
|
|
hashcpy(it->sha1, tree->object.sha1);
|
|
init_tree_desc(&desc, tree->buffer, tree->size);
|
|
cnt = 0;
|
|
while (tree_entry(&desc, &entry)) {
|
|
if (!S_ISDIR(entry.mode))
|
|
cnt++;
|
|
else {
|
|
struct cache_tree_sub *sub;
|
|
struct tree *subtree = lookup_tree(entry.sha1);
|
|
if (!subtree->object.parsed)
|
|
parse_tree(subtree);
|
|
sub = cache_tree_sub(it, entry.path);
|
|
sub->cache_tree = cache_tree();
|
|
prime_cache_tree_rec(sub->cache_tree, subtree);
|
|
cnt += sub->cache_tree->entry_count;
|
|
}
|
|
}
|
|
it->entry_count = cnt;
|
|
}
|
|
|
|
static void prime_cache_tree(void)
|
|
{
|
|
if (!nr_trees)
|
|
return;
|
|
active_cache_tree = cache_tree();
|
|
prime_cache_tree_rec(active_cache_tree, trees[0]);
|
|
|
|
}
|
|
|
|
static const char read_tree_usage[] = "git read-tree (<sha> | [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] [--exclude-per-directory=<gitignore>] [--index-output=<file>] <sha1> [<sha2> [<sha3>]])";
|
|
|
|
static struct lock_file lock_file;
|
|
|
|
int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
|
|
{
|
|
int i, newfd, stage = 0;
|
|
unsigned char sha1[20];
|
|
struct tree_desc t[MAX_UNPACK_TREES];
|
|
struct unpack_trees_options opts;
|
|
|
|
memset(&opts, 0, sizeof(opts));
|
|
opts.head_idx = -1;
|
|
opts.src_index = &the_index;
|
|
opts.dst_index = &the_index;
|
|
|
|
git_config(git_default_config, NULL);
|
|
|
|
newfd = hold_locked_index(&lock_file, 1);
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
/* "-u" means "update", meaning that a merge will update
|
|
* the working tree.
|
|
*/
|
|
if (!strcmp(arg, "-u")) {
|
|
opts.update = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "-v")) {
|
|
opts.verbose_update = 1;
|
|
continue;
|
|
}
|
|
|
|
/* "-i" means "index only", meaning that a merge will
|
|
* not even look at the working tree.
|
|
*/
|
|
if (!strcmp(arg, "-i")) {
|
|
opts.index_only = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!prefixcmp(arg, "--index-output=")) {
|
|
set_alternate_index_output(arg + 15);
|
|
continue;
|
|
}
|
|
|
|
/* "--prefix=<subdirectory>/" means keep the current index
|
|
* entries and put the entries from the tree under the
|
|
* given subdirectory.
|
|
*/
|
|
if (!prefixcmp(arg, "--prefix=")) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
opts.prefix = arg + 9;
|
|
opts.merge = 1;
|
|
stage = 1;
|
|
if (read_cache_unmerged())
|
|
die("you need to resolve your current index first");
|
|
continue;
|
|
}
|
|
|
|
/* This differs from "-m" in that we'll silently ignore
|
|
* unmerged entries and overwrite working tree files that
|
|
* correspond to them.
|
|
*/
|
|
if (!strcmp(arg, "--reset")) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
opts.reset = 1;
|
|
opts.merge = 1;
|
|
stage = 1;
|
|
read_cache_unmerged();
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "--trivial")) {
|
|
opts.trivial_merges_only = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "--aggressive")) {
|
|
opts.aggressive = 1;
|
|
continue;
|
|
}
|
|
|
|
/* "-m" stands for "merge", meaning we start in stage 1 */
|
|
if (!strcmp(arg, "-m")) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
if (read_cache_unmerged())
|
|
die("you need to resolve your current index first");
|
|
stage = 1;
|
|
opts.merge = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!prefixcmp(arg, "--exclude-per-directory=")) {
|
|
struct dir_struct *dir;
|
|
|
|
if (opts.dir)
|
|
die("more than one --exclude-per-directory are given.");
|
|
|
|
dir = xcalloc(1, sizeof(*opts.dir));
|
|
dir->show_ignored = 1;
|
|
dir->exclude_per_dir = arg + 24;
|
|
opts.dir = dir;
|
|
/* We do not need to nor want to do read-directory
|
|
* here; we are merely interested in reusing the
|
|
* per directory ignore stack mechanism.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
/* using -u and -i at the same time makes no sense */
|
|
if (1 < opts.index_only + opts.update)
|
|
usage(read_tree_usage);
|
|
|
|
if (get_sha1(arg, sha1))
|
|
die("Not a valid object name %s", arg);
|
|
if (list_tree(sha1) < 0)
|
|
die("failed to unpack tree object %s", arg);
|
|
stage++;
|
|
}
|
|
if ((opts.update||opts.index_only) && !opts.merge)
|
|
usage(read_tree_usage);
|
|
if ((opts.dir && !opts.update))
|
|
die("--exclude-per-directory is meaningless unless -u");
|
|
if (opts.merge && !opts.index_only)
|
|
setup_work_tree();
|
|
|
|
if (opts.merge) {
|
|
if (stage < 2)
|
|
die("just how do you expect me to merge %d trees?", stage-1);
|
|
switch (stage - 1) {
|
|
case 1:
|
|
opts.fn = opts.prefix ? bind_merge : oneway_merge;
|
|
break;
|
|
case 2:
|
|
opts.fn = twoway_merge;
|
|
opts.initial_checkout = is_cache_unborn();
|
|
break;
|
|
case 3:
|
|
default:
|
|
opts.fn = threeway_merge;
|
|
cache_tree_free(&active_cache_tree);
|
|
break;
|
|
}
|
|
|
|
if (stage - 1 >= 3)
|
|
opts.head_idx = stage - 2;
|
|
else
|
|
opts.head_idx = 1;
|
|
}
|
|
|
|
for (i = 0; i < nr_trees; i++) {
|
|
struct tree *tree = trees[i];
|
|
parse_tree(tree);
|
|
init_tree_desc(t+i, tree->buffer, tree->size);
|
|
}
|
|
if (unpack_trees(nr_trees, t, &opts))
|
|
return 128;
|
|
|
|
/*
|
|
* When reading only one tree (either the most basic form,
|
|
* "-m ent" or "--reset ent" form), we can obtain a fully
|
|
* valid cache-tree because the index must match exactly
|
|
* what came from the tree.
|
|
*/
|
|
if (nr_trees && !opts.prefix && (!opts.merge || (stage == 2))) {
|
|
cache_tree_free(&active_cache_tree);
|
|
prime_cache_tree();
|
|
}
|
|
|
|
if (write_cache(newfd, active_cache, active_nr) ||
|
|
commit_locked_index(&lock_file))
|
|
die("unable to write new index file");
|
|
return 0;
|
|
}
|