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![Junio C Hamano](/assets/img/avatar_default.png)
* jc/maint-read-tree-multi: checkout branch: prime cache-tree fully read-tree -m A B: prime cache-tree from the switched-to tree Move prime_cache_tree() to cache-tree.c read-tree A B: do not corrupt cache-tree
216 lines
5.2 KiB
C
216 lines
5.2 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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#include "object.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "cache-tree.h"
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#include "unpack-trees.h"
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#include "dir.h"
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#include "builtin.h"
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static int nr_trees;
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static struct tree *trees[MAX_UNPACK_TREES];
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static int list_tree(unsigned char *sha1)
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{
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struct tree *tree;
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if (nr_trees >= MAX_UNPACK_TREES)
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die("I cannot read more than %d trees", MAX_UNPACK_TREES);
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tree = parse_tree_indirect(sha1);
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if (!tree)
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return -1;
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trees[nr_trees++] = tree;
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return 0;
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}
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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>]])";
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static struct lock_file lock_file;
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int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
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{
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int i, newfd, stage = 0;
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unsigned char sha1[20];
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struct tree_desc t[MAX_UNPACK_TREES];
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struct unpack_trees_options opts;
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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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git_config(git_default_config, NULL);
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newfd = hold_locked_index(&lock_file, 1);
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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/* "-u" means "update", meaning that a merge will update
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* the working tree.
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*/
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if (!strcmp(arg, "-u")) {
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opts.update = 1;
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continue;
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}
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if (!strcmp(arg, "-v")) {
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opts.verbose_update = 1;
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continue;
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}
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/* "-i" means "index only", meaning that a merge will
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* not even look at the working tree.
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*/
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if (!strcmp(arg, "-i")) {
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opts.index_only = 1;
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continue;
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}
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if (!prefixcmp(arg, "--index-output=")) {
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set_alternate_index_output(arg + 15);
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continue;
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}
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/* "--prefix=<subdirectory>/" means keep the current index
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* entries and put the entries from the tree under the
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* given subdirectory.
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*/
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if (!prefixcmp(arg, "--prefix=")) {
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if (stage || opts.merge || opts.prefix)
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usage(read_tree_usage);
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opts.prefix = arg + 9;
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opts.merge = 1;
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stage = 1;
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if (read_cache_unmerged())
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die("you need to resolve your current index first");
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continue;
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}
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/* This differs from "-m" in that we'll silently ignore
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* unmerged entries and overwrite working tree files that
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* correspond to them.
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*/
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if (!strcmp(arg, "--reset")) {
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if (stage || opts.merge || opts.prefix)
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usage(read_tree_usage);
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opts.reset = 1;
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opts.merge = 1;
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stage = 1;
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read_cache_unmerged();
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continue;
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}
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if (!strcmp(arg, "--trivial")) {
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opts.trivial_merges_only = 1;
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continue;
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}
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if (!strcmp(arg, "--aggressive")) {
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opts.aggressive = 1;
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continue;
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}
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/* "-m" stands for "merge", meaning we start in stage 1 */
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if (!strcmp(arg, "-m")) {
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if (stage || opts.merge || opts.prefix)
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usage(read_tree_usage);
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if (read_cache_unmerged())
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die("you need to resolve your current index first");
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stage = 1;
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opts.merge = 1;
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continue;
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}
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if (!prefixcmp(arg, "--exclude-per-directory=")) {
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struct dir_struct *dir;
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if (opts.dir)
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die("more than one --exclude-per-directory are given.");
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dir = xcalloc(1, sizeof(*opts.dir));
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dir->flags |= DIR_SHOW_IGNORED;
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dir->exclude_per_dir = arg + 24;
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opts.dir = dir;
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/* We do not need to nor want to do read-directory
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* here; we are merely interested in reusing the
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* per directory ignore stack mechanism.
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*/
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continue;
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}
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/* using -u and -i at the same time makes no sense */
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if (1 < opts.index_only + opts.update)
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usage(read_tree_usage);
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if (get_sha1(arg, sha1))
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die("Not a valid object name %s", arg);
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if (list_tree(sha1) < 0)
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die("failed to unpack tree object %s", arg);
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stage++;
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}
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if ((opts.update||opts.index_only) && !opts.merge)
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usage(read_tree_usage);
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if ((opts.dir && !opts.update))
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die("--exclude-per-directory is meaningless unless -u");
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if (opts.merge && !opts.index_only)
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setup_work_tree();
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if (opts.merge) {
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if (stage < 2)
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die("just how do you expect me to merge %d trees?", stage-1);
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switch (stage - 1) {
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case 1:
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opts.fn = opts.prefix ? bind_merge : oneway_merge;
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break;
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case 2:
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opts.fn = twoway_merge;
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opts.initial_checkout = is_cache_unborn();
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break;
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case 3:
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default:
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opts.fn = threeway_merge;
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break;
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}
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if (stage - 1 >= 3)
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opts.head_idx = stage - 2;
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else
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opts.head_idx = 1;
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}
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cache_tree_free(&active_cache_tree);
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for (i = 0; i < nr_trees; i++) {
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struct tree *tree = trees[i];
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parse_tree(tree);
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init_tree_desc(t+i, tree->buffer, tree->size);
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}
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if (unpack_trees(nr_trees, t, &opts))
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return 128;
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/*
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* When reading only one tree (either the most basic form,
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* "-m ent" or "--reset ent" form), we can obtain a fully
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* valid cache-tree because the index must match exactly
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* what came from the tree.
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*
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* The same holds true if we are switching between two trees
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* using read-tree -m A B. The index must match B after that.
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*/
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if (nr_trees == 1 && !opts.prefix)
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prime_cache_tree(&active_cache_tree, trees[0]);
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else if (nr_trees == 2 && opts.merge)
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prime_cache_tree(&active_cache_tree, trees[1]);
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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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return 0;
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}
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