gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / builtin / read-tree.c
blob8bdcab11389e8b4facab355f27f0e1926134b86f
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 */
7 #include "cache.h"
8 #include "object.h"
9 #include "tree.h"
10 #include "tree-walk.h"
11 #include "cache-tree.h"
12 #include "unpack-trees.h"
13 #include "dir.h"
14 #include "builtin.h"
15 #include "parse-options.h"
16 #include "resolve-undo.h"
18 static int nr_trees;
19 static struct tree *trees[MAX_UNPACK_TREES];
21 static int list_tree(unsigned char *sha1)
23 struct tree *tree;
25 if (nr_trees >= MAX_UNPACK_TREES)
26 die("I cannot read more than %d trees", MAX_UNPACK_TREES);
27 tree = parse_tree_indirect(sha1);
28 if (!tree)
29 return -1;
30 trees[nr_trees++] = tree;
31 return 0;
34 static const char * const read_tree_usage[] = {
35 "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>]]",
36 NULL
39 static int index_output_cb(const struct option *opt, const char *arg,
40 int unset)
42 set_alternate_index_output(arg);
43 return 0;
46 static int exclude_per_directory_cb(const struct option *opt, const char *arg,
47 int unset)
49 struct dir_struct *dir;
50 struct unpack_trees_options *opts;
52 opts = (struct unpack_trees_options *)opt->value;
54 if (opts->dir)
55 die("more than one --exclude-per-directory given.");
57 dir = xcalloc(1, sizeof(*opts->dir));
58 dir->flags |= DIR_SHOW_IGNORED;
59 dir->exclude_per_dir = arg;
60 opts->dir = dir;
61 /* We do not need to nor want to do read-directory
62 * here; we are merely interested in reusing the
63 * per directory ignore stack mechanism.
65 return 0;
68 static void debug_stage(const char *label, struct cache_entry *ce,
69 struct unpack_trees_options *o)
71 printf("%s ", label);
72 if (!ce)
73 printf("(missing)\n");
74 else if (ce == o->df_conflict_entry)
75 printf("(conflict)\n");
76 else
77 printf("%06o #%d %s %.8s\n",
78 ce->ce_mode, ce_stage(ce), ce->name,
79 sha1_to_hex(ce->sha1));
82 static int debug_merge(struct cache_entry **stages, struct unpack_trees_options *o)
84 int i;
86 printf("* %d-way merge\n", o->merge_size);
87 debug_stage("index", stages[0], o);
88 for (i = 1; i <= o->merge_size; i++) {
89 char buf[24];
90 sprintf(buf, "ent#%d", i);
91 debug_stage(buf, stages[i], o);
93 return 0;
96 static struct lock_file lock_file;
98 int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
100 int i, newfd, stage = 0;
101 unsigned char sha1[20];
102 struct tree_desc t[MAX_UNPACK_TREES];
103 struct unpack_trees_options opts;
104 int prefix_set = 0;
105 const struct option read_tree_options[] = {
106 { OPTION_CALLBACK, 0, "index-output", NULL, "FILE",
107 "write resulting index to <FILE>",
108 PARSE_OPT_NONEG, index_output_cb },
109 OPT__VERBOSE(&opts.verbose_update),
110 OPT_GROUP("Merging"),
111 OPT_SET_INT('m', NULL, &opts.merge,
112 "perform a merge in addition to a read", 1),
113 OPT_SET_INT(0, "trivial", &opts.trivial_merges_only,
114 "3-way merge if no file level merging required", 1),
115 OPT_SET_INT(0, "aggressive", &opts.aggressive,
116 "3-way merge in presence of adds and removes", 1),
117 OPT_SET_INT(0, "reset", &opts.reset,
118 "same as -m, but discard unmerged entries", 1),
119 { OPTION_STRING, 0, "prefix", &opts.prefix, "<subdirectory>/",
120 "read the tree into the index under <subdirectory>/",
121 PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP },
122 OPT_SET_INT('u', NULL, &opts.update,
123 "update working tree with merge result", 1),
124 { OPTION_CALLBACK, 0, "exclude-per-directory", &opts,
125 "gitignore",
126 "allow explicitly ignored files to be overwritten",
127 PARSE_OPT_NONEG, exclude_per_directory_cb },
128 OPT_SET_INT('i', NULL, &opts.index_only,
129 "don't check the working tree after merging", 1),
130 OPT_SET_INT(0, "no-sparse-checkout", &opts.skip_sparse_checkout,
131 "skip applying sparse checkout filter", 1),
132 OPT_SET_INT(0, "debug-unpack", &opts.debug_unpack,
133 "debug unpack-trees", 1),
134 OPT_END()
137 memset(&opts, 0, sizeof(opts));
138 opts.head_idx = -1;
139 opts.src_index = &the_index;
140 opts.dst_index = &the_index;
142 git_config(git_default_config, NULL);
144 argc = parse_options(argc, argv, unused_prefix, read_tree_options,
145 read_tree_usage, 0);
147 newfd = hold_locked_index(&lock_file, 1);
149 prefix_set = opts.prefix ? 1 : 0;
150 if (1 < opts.merge + opts.reset + prefix_set)
151 die("Which one? -m, --reset, or --prefix?");
153 if (opts.reset || opts.merge || opts.prefix) {
154 if (read_cache_unmerged() && (opts.prefix || opts.merge))
155 die("You need to resolve your current index first");
156 stage = opts.merge = 1;
158 resolve_undo_clear();
160 for (i = 0; i < argc; i++) {
161 const char *arg = argv[i];
163 if (get_sha1(arg, sha1))
164 die("Not a valid object name %s", arg);
165 if (list_tree(sha1) < 0)
166 die("failed to unpack tree object %s", arg);
167 stage++;
169 if (1 < opts.index_only + opts.update)
170 die("-u and -i at the same time makes no sense");
171 if ((opts.update||opts.index_only) && !opts.merge)
172 die("%s is meaningless without -m, --reset, or --prefix",
173 opts.update ? "-u" : "-i");
174 if ((opts.dir && !opts.update))
175 die("--exclude-per-directory is meaningless unless -u");
176 if (opts.merge && !opts.index_only)
177 setup_work_tree();
179 if (opts.merge) {
180 if (stage < 2)
181 die("just how do you expect me to merge %d trees?", stage-1);
182 switch (stage - 1) {
183 case 1:
184 opts.fn = opts.prefix ? bind_merge : oneway_merge;
185 break;
186 case 2:
187 opts.fn = twoway_merge;
188 opts.initial_checkout = is_cache_unborn();
189 break;
190 case 3:
191 default:
192 opts.fn = threeway_merge;
193 break;
196 if (stage - 1 >= 3)
197 opts.head_idx = stage - 2;
198 else
199 opts.head_idx = 1;
202 if (opts.debug_unpack)
203 opts.fn = debug_merge;
205 cache_tree_free(&active_cache_tree);
206 for (i = 0; i < nr_trees; i++) {
207 struct tree *tree = trees[i];
208 parse_tree(tree);
209 init_tree_desc(t+i, tree->buffer, tree->size);
211 if (unpack_trees(nr_trees, t, &opts))
212 return 128;
214 if (opts.debug_unpack)
215 return 0; /* do not write the index out */
218 * When reading only one tree (either the most basic form,
219 * "-m ent" or "--reset ent" form), we can obtain a fully
220 * valid cache-tree because the index must match exactly
221 * what came from the tree.
223 * The same holds true if we are switching between two trees
224 * using read-tree -m A B. The index must match B after that.
226 if (nr_trees == 1 && !opts.prefix)
227 prime_cache_tree(&active_cache_tree, trees[0]);
228 else if (nr_trees == 2 && opts.merge)
229 prime_cache_tree(&active_cache_tree, trees[1]);
231 if (write_cache(newfd, active_cache, active_nr) ||
232 commit_locked_index(&lock_file))
233 die("unable to write new index file");
234 return 0;