--- /dev/null
- *
- * The same holds true if we are switching between two trees
- * using read-tree -m A B. The index must match B after that.
+ /*
+ * 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"
+ #include "parse-options.h"
+ #include "resolve-undo.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 const char * const read_tree_usage[] = {
+ "git read-tree [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u [--exclude-per-directory=<gitignore>] | -i]] [--no-sparse-checkout] [--index-output=<file>] <tree-ish1> [<tree-ish2> [<tree-ish3>]]",
+ NULL
+ };
+
+ static int index_output_cb(const struct option *opt, const char *arg,
+ int unset)
+ {
+ set_alternate_index_output(arg);
+ return 0;
+ }
+
+ static int exclude_per_directory_cb(const struct option *opt, const char *arg,
+ int unset)
+ {
+ struct dir_struct *dir;
+ struct unpack_trees_options *opts;
+
+ opts = (struct unpack_trees_options *)opt->value;
+
+ if (opts->dir)
+ die("more than one --exclude-per-directory given.");
+
+ dir = xcalloc(1, sizeof(*opts->dir));
+ dir->flags |= DIR_SHOW_IGNORED;
+ dir->exclude_per_dir = arg;
+ 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.
+ */
+ return 0;
+ }
+
+ static void debug_stage(const char *label, struct cache_entry *ce,
+ struct unpack_trees_options *o)
+ {
+ printf("%s ", label);
+ if (!ce)
+ printf("(missing)\n");
+ else if (ce == o->df_conflict_entry)
+ printf("(conflict)\n");
+ else
+ printf("%06o #%d %s %.8s\n",
+ ce->ce_mode, ce_stage(ce), ce->name,
+ sha1_to_hex(ce->sha1));
+ }
+
+ static int debug_merge(struct cache_entry **stages, struct unpack_trees_options *o)
+ {
+ int i;
+
+ printf("* %d-way merge\n", o->merge_size);
+ debug_stage("index", stages[0], o);
+ for (i = 1; i <= o->merge_size; i++) {
+ char buf[24];
+ sprintf(buf, "ent#%d", i);
+ debug_stage(buf, stages[i], o);
+ }
+ return 0;
+ }
+
+ 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;
+ int prefix_set = 0;
+ const struct option read_tree_options[] = {
+ { OPTION_CALLBACK, 0, "index-output", NULL, "FILE",
+ "write resulting index to <FILE>",
+ PARSE_OPT_NONEG, index_output_cb },
+ OPT__VERBOSE(&opts.verbose_update),
+ OPT_GROUP("Merging"),
+ OPT_SET_INT('m', NULL, &opts.merge,
+ "perform a merge in addition to a read", 1),
+ OPT_SET_INT(0, "trivial", &opts.trivial_merges_only,
+ "3-way merge if no file level merging required", 1),
+ OPT_SET_INT(0, "aggressive", &opts.aggressive,
+ "3-way merge in presence of adds and removes", 1),
+ OPT_SET_INT(0, "reset", &opts.reset,
+ "same as -m, but discard unmerged entries", 1),
+ { OPTION_STRING, 0, "prefix", &opts.prefix, "<subdirectory>/",
+ "read the tree into the index under <subdirectory>/",
+ PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP },
+ OPT_SET_INT('u', NULL, &opts.update,
+ "update working tree with merge result", 1),
+ { OPTION_CALLBACK, 0, "exclude-per-directory", &opts,
+ "gitignore",
+ "allow explicitly ignored files to be overwritten",
+ PARSE_OPT_NONEG, exclude_per_directory_cb },
+ OPT_SET_INT('i', NULL, &opts.index_only,
+ "don't check the working tree after merging", 1),
+ OPT_SET_INT(0, "no-sparse-checkout", &opts.skip_sparse_checkout,
+ "skip applying sparse checkout filter", 1),
+ OPT_SET_INT(0, "debug-unpack", &opts.debug_unpack,
+ "debug unpack-trees", 1),
+ OPT_END()
+ };
+
+ 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);
+
+ argc = parse_options(argc, argv, unused_prefix, read_tree_options,
+ read_tree_usage, 0);
+
+ newfd = hold_locked_index(&lock_file, 1);
+
+ prefix_set = opts.prefix ? 1 : 0;
+ if (1 < opts.merge + opts.reset + prefix_set)
+ die("Which one? -m, --reset, or --prefix?");
+
+ if (opts.reset || opts.merge || opts.prefix) {
+ if (read_cache_unmerged() && (opts.prefix || opts.merge))
+ die("You need to resolve your current index first");
+ stage = opts.merge = 1;
+ }
+ resolve_undo_clear();
+
+ for (i = 0; i < argc; i++) {
+ const char *arg = argv[i];
+
+ 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 (1 < opts.index_only + opts.update)
+ die("-u and -i at the same time makes no sense");
+ if ((opts.update||opts.index_only) && !opts.merge)
+ die("%s is meaningless without -m, --reset, or --prefix",
+ opts.update ? "-u" : "-i");
+ 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;
+ break;
+ }
+
+ if (stage - 1 >= 3)
+ opts.head_idx = stage - 2;
+ else
+ opts.head_idx = 1;
+ }
+
+ if (opts.debug_unpack)
+ opts.fn = debug_merge;
+
+ cache_tree_free(&active_cache_tree);
+ 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;
+
+ if (opts.debug_unpack)
+ return 0; /* do not write the index out */
+
+ /*
+ * 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.
- else if (nr_trees == 2 && opts.merge)
- prime_cache_tree(&active_cache_tree, trees[1]);
+ */
+ if (nr_trees == 1 && !opts.prefix)
+ prime_cache_tree(&active_cache_tree, trees[0]);
+
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_locked_index(&lock_file))
+ die("unable to write new index file");
+ return 0;
+ }
projects / thirdparty / git.git / commitdiff
