1#include "cache.h"
2#include "tree.h"
3#include "diff.h"
4static int cached_only = 0;
6static int match_nonexisting = 0;
7static struct diff_options diff_options;
8/* A file entry went away or appeared */
10static void show_file(const char *prefix,
11 struct cache_entry *ce,
12 unsigned char *sha1, unsigned int mode)
13{
14 diff_addremove(&diff_options, prefix[0], ntohl(mode),
15 sha1, ce->name, NULL);
16}
17static int get_stat_data(struct cache_entry *ce,
19 unsigned char ** sha1p, unsigned int *modep)
20{
21 unsigned char *sha1 = ce->sha1;
22 unsigned int mode = ce->ce_mode;
23 if (!cached_only) {
25 static unsigned char no_sha1[20];
26 int changed;
27 struct stat st;
28 if (lstat(ce->name, &st) < 0) {
29 if (errno == ENOENT && match_nonexisting) {
30 *sha1p = sha1;
31 *modep = mode;
32 return 0;
33 }
34 return -1;
35 }
36 changed = ce_match_stat(ce, &st);
37 if (changed) {
38 mode = create_ce_mode(st.st_mode);
39 if (!trust_executable_bit &&
40 S_ISREG(mode) && S_ISREG(ce->ce_mode) &&
41 ((mode ^ ce->ce_mode) == 0111))
42 mode = ce->ce_mode;
43 sha1 = no_sha1;
44 }
45 }
46 *sha1p = sha1;
48 *modep = mode;
49 return 0;
50}
51static void show_new_file(struct cache_entry *new)
53{
54 unsigned char *sha1;
55 unsigned int mode;
56 /* New file in the index: it might actually be different in
58 * the working copy.
59 */
60 if (get_stat_data(new, &sha1, &mode) < 0)
61 return;
62 show_file("+", new, sha1, mode);
64}
65static int show_modified(struct cache_entry *old,
67 struct cache_entry *new,
68 int report_missing)
69{
70 unsigned int mode, oldmode;
71 unsigned char *sha1;
72 if (get_stat_data(new, &sha1, &mode) < 0) {
74 if (report_missing)
75 show_file("-", old, old->sha1, old->ce_mode);
76 return -1;
77 }
78 oldmode = old->ce_mode;
80 if (mode == oldmode && !memcmp(sha1, old->sha1, 20) &&
81 !diff_options.find_copies_harder)
82 return 0;
83 mode = ntohl(mode);
85 oldmode = ntohl(oldmode);
86 diff_change(&diff_options, oldmode, mode,
88 old->sha1, sha1, old->name, NULL);
89 return 0;
90}
91static int diff_cache(struct cache_entry **ac, int entries, const char **pathspec)
93{
94 while (entries) {
95 struct cache_entry *ce = *ac;
96 int same = (entries > 1) && ce_same_name(ce, ac[1]);
97 if (!ce_path_match(ce, pathspec))
99 goto skip_entry;
100 switch (ce_stage(ce)) {
102 case 0:
103 /* No stage 1 entry? That means it's a new file */
104 if (!same) {
105 show_new_file(ce);
106 break;
107 }
108 /* Show difference between old and new */
109 show_modified(ac[1], ce, 1);
110 break;
111 case 1:
112 /* No stage 3 (merge) entry? That means it's been deleted */
113 if (!same) {
114 show_file("-", ce, ce->sha1, ce->ce_mode);
115 break;
116 }
117 /* We come here with ce pointing at stage 1
118 * (original tree) and ac[1] pointing at stage
119 * 3 (unmerged). show-modified with
120 * report-missing set to false does not say the
121 * file is deleted but reports true if work
122 * tree does not have it, in which case we
123 * fall through to report the unmerged state.
124 * Otherwise, we show the differences between
125 * the original tree and the work tree.
126 */
127 if (!cached_only && !show_modified(ce, ac[1], 0))
128 break;
129 /* fallthru */
130 case 3:
131 diff_unmerge(&diff_options, ce->name);
132 break;
133 default:
135 die("impossible cache entry stage");
136 }
137skip_entry:
139 /*
140 * Ignore all the different stages for this file,
141 * we've handled the relevant cases now.
142 */
143 do {
144 ac++;
145 entries--;
146 } while (entries && ce_same_name(ce, ac[0]));
147 }
148 return 0;
149}
150/*
152 * This turns all merge entries into "stage 3". That guarantees that
153 * when we read in the new tree (into "stage 1"), we won't lose sight
154 * of the fact that we had unmerged entries.
155 */
156static void mark_merge_entries(void)
157{
158 int i;
159 for (i = 0; i < active_nr; i++) {
160 struct cache_entry *ce = active_cache[i];
161 if (!ce_stage(ce))
162 continue;
163 ce->ce_flags |= htons(CE_STAGEMASK);
164 }
165}
166static const char diff_cache_usage[] =
168"git-diff-index [-m] [--cached] "
169"[<common diff options>] <tree-ish> [<path>...]"
170COMMON_DIFF_OPTIONS_HELP;
171int main(int argc, const char **argv)
173{
174 const char *tree_name = NULL;
175 unsigned char sha1[20];
176 const char *prefix = setup_git_directory();
177 const char **pathspec = NULL;
178 struct tree *tree;
179 int ret;
180 int allow_options = 1;
181 int i;
182 git_config(git_diff_config);
184 diff_setup(&diff_options);
185 for (i = 1; i < argc; i++) {
186 const char *arg = argv[i];
187 int diff_opt_cnt;
188 if (!allow_options || *arg != '-') {
190 if (tree_name)
191 break;
192 tree_name = arg;
193 continue;
194 }
195
196 if (!strcmp(arg, "--")) {
197 allow_options = 0;
198 continue;
199 }
200 if (!strcmp(arg, "-r")) {
201 /* We accept the -r flag just to look like git-diff-tree */
202 continue;
203 }
204 if (!strcmp(arg, "--cc"))
205 /*
206 * I _think_ "diff-index --cached HEAD" with an
207 * unmerged index could show something else
208 * later, but pretend --cc is the same as -p for
209 * now. "git diff" uses --cc by default.
210 */
211 argv[i] = arg = "-p";
212 diff_opt_cnt = diff_opt_parse(&diff_options, argv + i,
213 argc - i);
214 if (diff_opt_cnt < 0)
215 usage(diff_cache_usage);
216 else if (diff_opt_cnt) {
217 i += diff_opt_cnt - 1;
218 continue;
219 }
220 if (!strcmp(arg, "-m")) {
222 match_nonexisting = 1;
223 continue;
224 }
225 if (!strcmp(arg, "--cached")) {
226 cached_only = 1;
227 continue;
228 }
229 usage(diff_cache_usage);
230 }
231 pathspec = get_pathspec(prefix, argv + i);
233 if (diff_setup_done(&diff_options) < 0)
235 usage(diff_cache_usage);
236 if (!tree_name || get_sha1(tree_name, sha1))
238 usage(diff_cache_usage);
239 read_cache();
241 mark_merge_entries();
243 tree = parse_tree_indirect(sha1);
245 if (!tree)
246 die("bad tree object %s", tree_name);
247 if (read_tree(tree, 1, pathspec))
248 die("unable to read tree object %s", tree_name);
249 ret = diff_cache(active_cache, active_nr, pathspec);
251 diffcore_std(&diff_options);
253 diff_flush(&diff_options);
254 return ret;
255}