diff options
Diffstat (limited to 'builtin-read-tree.c')
| -rw-r--r-- | builtin-read-tree.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/builtin-read-tree.c b/builtin-read-tree.c new file mode 100644 index 0000000..43cd56a --- /dev/null +++ b/builtin-read-tree.c @@ -0,0 +1,289 @@ +/* + * 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" + +#define MAX_TREES 8 +static int nr_trees; +static struct tree *trees[MAX_TREES]; + +static int list_tree(unsigned char *sha1) +{ + struct tree *tree; + + if (nr_trees >= MAX_TREES) + die("I cannot read more than %d trees", MAX_TREES); + tree = parse_tree_indirect(sha1); + if (!tree) + return -1; + trees[nr_trees++] = tree; + return 0; +} + +static int read_cache_unmerged(void) +{ + int i; + struct cache_entry **dst; + struct cache_entry *last = NULL; + + read_cache(); + dst = active_cache; + for (i = 0; i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + if (ce_stage(ce)) { + if (last && !strcmp(ce->name, last->name)) + continue; + cache_tree_invalidate_path(active_cache_tree, ce->name); + last = ce; + ce->ce_mode = 0; + ce->ce_flags &= ~htons(CE_STAGEMASK); + } + *dst++ = ce; + } + active_nr = dst - active_cache; + return !!last; +} + +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_TREES]; + struct unpack_trees_options opts; + + memset(&opts, 0, sizeof(opts)); + opts.head_idx = -1; + + git_config(git_default_config); + + newfd = hold_locked_index(&lock_file, 1); + + git_config(git_default_config); + + 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.prefix) { + int pfxlen = strlen(opts.prefix); + int pos; + if (opts.prefix[pfxlen-1] != '/') + die("prefix must end with /"); + if (stage != 2) + die("binding merge takes only one tree"); + pos = cache_name_pos(opts.prefix, pfxlen); + if (0 <= pos) + die("corrupt index file"); + pos = -pos-1; + if (pos < active_nr && + !strncmp(active_cache[pos]->name, opts.prefix, pfxlen)) + die("subdirectory '%s' already exists.", opts.prefix); + pos = cache_name_pos(opts.prefix, pfxlen-1); + if (0 <= pos) + die("file '%.*s' already exists.", + pfxlen-1, opts.prefix); + opts.pos = -1 - pos; + } + + 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; + 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); + } + unpack_trees(nr_trees, t, &opts); + + /* + * 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) || + close(newfd) || commit_locked_index(&lock_file)) + die("unable to write new index file"); + return 0; +} |