diff --no-index: use strbuf for temporary pathnames
[git/git.git] / diff-no-index.c
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1/*
2 * "diff --no-index" support
3 * Copyright (c) 2007 by Johannes Schindelin
4 * Copyright (c) 2008 by Junio C Hamano
5 */
6
7#include "cache.h"
8#include "color.h"
9#include "commit.h"
10#include "blob.h"
11#include "tag.h"
12#include "diff.h"
13#include "diffcore.h"
14#include "revision.h"
15#include "log-tree.h"
16#include "builtin.h"
c455c87c 17#include "string-list.h"
0569e9b8 18
c455c87c 19static int read_directory(const char *path, struct string_list *list)
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20{
21 DIR *dir;
22 struct dirent *e;
23
24 if (!(dir = opendir(path)))
25 return error("Could not open directory %s", path);
26
27 while ((e = readdir(dir)))
28 if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
78a395d3 29 string_list_insert(list, e->d_name);
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30
31 closedir(dir);
32 return 0;
33}
34
35static int get_mode(const char *path, int *mode)
36{
37 struct stat st;
38
39 if (!path || !strcmp(path, "/dev/null"))
40 *mode = 0;
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41#ifdef _WIN32
42 else if (!strcasecmp(path, "nul"))
43 *mode = 0;
44#endif
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45 else if (!strcmp(path, "-"))
46 *mode = create_ce_mode(0666);
418566b6 47 else if (lstat(path, &st))
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48 return error("Could not access '%s'", path);
49 else
50 *mode = st.st_mode;
51 return 0;
52}
53
54static int queue_diff(struct diff_options *o,
875b91b3 55 const char *name1, const char *name2)
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56{
57 int mode1 = 0, mode2 = 0;
58
59 if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
60 return -1;
61
62 if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
63 return error("file/directory conflict: %s, %s", name1, name2);
64
65 if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
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66 struct strbuf buffer1 = STRBUF_INIT;
67 struct strbuf buffer2 = STRBUF_INIT;
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68 struct string_list p1 = STRING_LIST_INIT_DUP;
69 struct string_list p2 = STRING_LIST_INIT_DUP;
875b91b3 70 int i1, i2, ret = 0;
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71
72 if (name1 && read_directory(name1, &p1))
73 return -1;
74 if (name2 && read_directory(name2, &p2)) {
c455c87c 75 string_list_clear(&p1, 0);
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76 return -1;
77 }
78
79 if (name1) {
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80 strbuf_addstr(&buffer1, name1);
81 if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
82 strbuf_addch(&buffer1, '/');
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83 }
84
85 if (name2) {
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86 strbuf_addstr(&buffer2, name2);
87 if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
88 strbuf_addch(&buffer2, '/');
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89 }
90
91 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
92 const char *n1, *n2;
93 int comp;
94
95 if (i1 == p1.nr)
96 comp = 1;
97 else if (i2 == p2.nr)
98 comp = -1;
99 else
875b91b3 100 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
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101
102 if (comp > 0)
103 n1 = NULL;
104 else {
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105 strbuf_addstr(&buffer1, p1.items[i1++].string);
106 n1 = buffer1.buf;
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107 }
108
109 if (comp < 0)
110 n2 = NULL;
111 else {
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112 strbuf_addstr(&buffer2, p2.items[i2++].string);
113 n2 = buffer2.buf;
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114 }
115
116 ret = queue_diff(o, n1, n2);
117 }
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118 string_list_clear(&p1, 0);
119 string_list_clear(&p2, 0);
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120 strbuf_reset(&buffer1);
121 strbuf_reset(&buffer2);
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122
123 return ret;
124 } else {
125 struct diff_filespec *d1, *d2;
126
127 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
128 unsigned tmp;
129 const char *tmp_c;
130 tmp = mode1; mode1 = mode2; mode2 = tmp;
131 tmp_c = name1; name1 = name2; name2 = tmp_c;
132 }
133
134 if (!name1)
135 name1 = "/dev/null";
136 if (!name2)
137 name2 = "/dev/null";
138 d1 = alloc_filespec(name1);
139 d2 = alloc_filespec(name2);
140 fill_filespec(d1, null_sha1, mode1);
141 fill_filespec(d2, null_sha1, mode2);
142
143 diff_queue(&diff_queued_diff, d1, d2);
144 return 0;
145 }
146}
147
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148static int path_outside_repo(const char *path)
149{
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150 const char *work_tree;
151 size_t len;
152
153 if (!is_absolute_path(path))
154 return 0;
155 work_tree = get_git_work_tree();
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156 if (!work_tree)
157 return 1;
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158 len = strlen(work_tree);
159 if (strncmp(path, work_tree, len) ||
160 (path[len] != '\0' && path[len] != '/'))
161 return 1;
162 return 0;
163}
164
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165void diff_no_index(struct rev_info *revs,
166 int argc, const char **argv,
167 int nongit, const char *prefix)
168{
169 int i;
170 int no_index = 0;
171 unsigned options = 0;
172
173 /* Were we asked to do --no-index explicitly? */
174 for (i = 1; i < argc; i++) {
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175 if (!strcmp(argv[i], "--")) {
176 i++;
177 break;
178 }
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179 if (!strcmp(argv[i], "--no-index"))
180 no_index = 1;
181 if (argv[i][0] != '-')
182 break;
183 }
184
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185 if (!no_index && !nongit) {
186 /*
187 * Inside a git repository, without --no-index. Only
188 * when a path outside the repository is given,
189 * e.g. "git diff /var/tmp/[12]", or "git diff
190 * Makefile /var/tmp/Makefile", allow it to be used as
191 * a colourful "diff" replacement.
192 */
193 if ((argc != i + 2) ||
194 (!path_outside_repo(argv[i]) &&
195 !path_outside_repo(argv[i+1])))
196 return;
197 }
0569e9b8 198 if (argc != i + 2)
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199 usagef("git diff %s <path> <path>",
200 no_index ? "--no-index" : "[--no-index]");
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201
202 diff_setup(&revs->diffopt);
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203 for (i = 1; i < argc - 2; ) {
204 int j;
205 if (!strcmp(argv[i], "--no-index"))
206 i++;
a324fc45 207 else if (!strcmp(argv[i], "-q")) {
0569e9b8 208 options |= DIFF_SILENT_ON_REMOVED;
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209 i++;
210 }
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211 else if (!strcmp(argv[i], "--"))
212 i++;
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213 else {
214 j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
215 if (!j)
216 die("invalid diff option/value: %s", argv[i]);
217 i += j;
218 }
219 }
220
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221 /*
222 * If the user asked for our exit code then don't start a
223 * pager or we would end up reporting its exit code instead.
224 */
225 if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
226 setup_pager();
227
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228 if (prefix) {
229 int len = strlen(prefix);
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230 const char *paths[3];
231 memset(paths, 0, sizeof(paths));
0569e9b8 232
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233 for (i = 0; i < 2; i++) {
234 const char *p = argv[argc - 2 + i];
235 /*
236 * stdin should be spelled as '-'; if you have
237 * path that is '-', spell it as ./-.
238 */
239 p = (strcmp(p, "-")
240 ? xstrdup(prefix_filename(prefix, len, p))
241 : p);
16dc36fe 242 paths[i] = p;
0569e9b8 243 }
16dc36fe 244 diff_tree_setup_paths(paths, &revs->diffopt);
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245 }
246 else
16dc36fe 247 diff_tree_setup_paths(argv + argc - 2, &revs->diffopt);
d61027b2 248 revs->diffopt.skip_stat_unmatch = 1;
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249 if (!revs->diffopt.output_format)
250 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
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251
252 DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
253 DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
254
255 revs->max_count = -2;
256 if (diff_setup_done(&revs->diffopt) < 0)
257 die("diff_setup_done failed");
258
66f13625
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259 if (queue_diff(&revs->diffopt, revs->diffopt.pathspec.raw[0],
260 revs->diffopt.pathspec.raw[1]))
0569e9b8 261 exit(1);
a5a818ee 262 diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
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263 diffcore_std(&revs->diffopt);
264 diff_flush(&revs->diffopt);
265
266 /*
267 * The return code for --no-index imitates diff(1):
268 * 0 = no changes, 1 = changes, else error
269 */
270 exit(revs->diffopt.found_changes);
271}