bc486ba07273f6836084644e80897bb1d4b9e27c
1/*
2 * Check-out files from the "current cache directory"
3 *
4 * Copyright (C) 2005 Linus Torvalds
5 *
6 * Careful: order of argument flags does matter. For example,
7 *
8 * checkout-cache -a -f file.c
9 *
10 * Will first check out all files listed in the cache (but not
11 * overwrite any old ones), and then force-checkout "file.c" a
12 * second time (ie that one _will_ overwrite any old contents
13 * with the same filename).
14 *
15 * Also, just doing "checkout-cache" does nothing. You probably
16 * meant "checkout-cache -a". And if you want to force it, you
17 * want "checkout-cache -f -a".
18 *
19 * Intuitiveness is not the goal here. Repeatability is. The
20 * reason for the "no arguments means no work" thing is that
21 * from scripts you are supposed to be able to do things like
22 *
23 * find . -name '*.h' -print0 | xargs -0 checkout-cache -f --
24 *
25 * which will force all existing *.h files to be replaced with
26 * their cached copies. If an empty command line implied "all",
27 * then this would force-refresh everything in the cache, which
28 * was not the point.
29 *
30 * Oh, and the "--" is just a good idea when you know the rest
31 * will be filenames. Just so that you wouldn't have a filename
32 * of "-a" causing problems (not possible in the above example,
33 * but get used to it in scripting!).
34 */
35#include <sys/types.h>
36#include <dirent.h>
37#include "cache.h"
38static int force = 0, quiet = 0, not_new = 0, refresh_cache = 0;
40static void create_directories(const char *path)
42{
43 int len = strlen(path);
44 char *buf = xmalloc(len + 1);
45 const char *slash = path;
46 while ((slash = strchr(slash+1, '/')) != NULL) {
48 len = slash - path;
49 memcpy(buf, path, len);
50 buf[len] = 0;
51 if (mkdir(buf, 0755)) {
52 if (errno == EEXIST) {
53 struct stat st;
54 if (!lstat(buf, &st) && S_ISDIR(st.st_mode))
55 continue; /* ok */
56 if (force && !unlink(buf) && !mkdir(buf, 0755))
57 continue;
58 }
59 die("cannot create directory at %s", buf);
60 }
61 }
62 free(buf);
63}
64static void remove_subtree(const char *path)
66{
67 DIR *dir = opendir(path);
68 struct dirent *de;
69 char pathbuf[PATH_MAX];
70 char *name;
71
72 if (!dir)
73 die("cannot opendir %s", path);
74 strcpy(pathbuf, path);
75 name = pathbuf + strlen(path);
76 *name++ = '/';
77 while ((de = readdir(dir)) != NULL) {
78 struct stat st;
79 if ((de->d_name[0] == '.') &&
80 ((de->d_name[1] == 0) ||
81 ((de->d_name[1] == '.') && de->d_name[2] == 0)))
82 continue;
83 strcpy(name, de->d_name);
84 if (lstat(pathbuf, &st))
85 die("cannot lstat %s", pathbuf);
86 if (S_ISDIR(st.st_mode))
87 remove_subtree(pathbuf);
88 else if (unlink(pathbuf))
89 die("cannot unlink %s", pathbuf);
90 }
91 closedir(dir);
92 if (rmdir(path))
93 die("cannot rmdir %s", path);
94}
95static int create_file(const char *path, unsigned int mode)
97{
98 int fd;
99 mode = (mode & 0100) ? 0777 : 0666;
101 create_directories(path);
102 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
103 if (fd < 0) {
104 if (errno == EISDIR && force) {
105 remove_subtree(path);
106 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
107 }
108 }
109 return fd;
110}
111static int write_entry(struct cache_entry *ce, const char *path)
113{
114 int fd;
115 void *new;
116 unsigned long size;
117 long wrote;
118 char type[20];
119 char target[1024];
120 new = read_sha1_file(ce->sha1, type, &size);
122 if (!new || strcmp(type, "blob")) {
123 if (new)
124 free(new);
125 return error("checkout-cache: unable to read sha1 file of %s (%s)",
126 path, sha1_to_hex(ce->sha1));
127 }
128 switch (ntohl(ce->ce_mode) & S_IFMT) {
129 case S_IFREG:
130 fd = create_file(path, ntohl(ce->ce_mode));
131 if (fd < 0) {
132 free(new);
133 return error("checkout-cache: unable to create file %s (%s)",
134 path, strerror(errno));
135 }
136 wrote = write(fd, new, size);
137 close(fd);
138 free(new);
139 if (wrote != size)
140 return error("checkout-cache: unable to write file %s", path);
141 break;
142 case S_IFLNK:
143 memcpy(target, new, size);
144 target[size] = '\0';
145 create_directories(path);
146 if (symlink(target, path)) {
147 free(new);
148 return error("checkout-cache: unable to create symlink %s (%s)",
149 path, strerror(errno));
150 }
151 free(new);
152 break;
153 default:
154 free(new);
155 return error("checkout-cache: unknown file mode for %s", path);
156 }
157 if (refresh_cache) {
159 struct stat st;
160 lstat(ce->name, &st);
161 fill_stat_cache_info(ce, &st);
162 }
163 return 0;
164}
165static int checkout_entry(struct cache_entry *ce, const char *base_dir)
167{
168 struct stat st;
169 static char path[MAXPATHLEN+1];
170 int len = strlen(base_dir);
171 memcpy(path, base_dir, len);
173 strcpy(path + len, ce->name);
174 if (!lstat(path, &st)) {
176 unsigned changed = ce_match_stat(ce, &st);
177 if (!changed)
178 return 0;
179 if (!force) {
180 if (!quiet)
181 fprintf(stderr, "checkout-cache: %s already exists\n", path);
182 return 0;
183 }
184 /*
186 * We unlink the old file, to get the new one with the
187 * right permissions (including umask, which is nasty
188 * to emulate by hand - much easier to let the system
189 * just do the right thing)
190 */
191 unlink(path);
192 } else if (not_new)
193 return 0;
194 return write_entry(ce, path);
195}
196static int checkout_file(const char *name, const char *base_dir)
198{
199 int pos = cache_name_pos(name, strlen(name));
200 if (pos < 0) {
201 if (!quiet) {
202 pos = -pos - 1;
203 fprintf(stderr,
204 "checkout-cache: %s is %s.\n",
205 name,
206 (pos < active_nr &&
207 !strcmp(active_cache[pos]->name, name)) ?
208 "unmerged" : "not in the cache");
209 }
210 return -1;
211 }
212 return checkout_entry(active_cache[pos], base_dir);
213}
214static int checkout_all(const char *base_dir)
216{
217 int i;
218 for (i = 0; i < active_nr ; i++) {
220 struct cache_entry *ce = active_cache[i];
221 if (ce_stage(ce))
222 continue;
223 if (checkout_entry(ce, base_dir) < 0)
224 return -1;
225 }
226 return 0;
227}
228int main(int argc, char **argv)
230{
231 int i, force_filename = 0;
232 const char *base_dir = "";
233 struct cache_file cache_file;
234 int newfd = -1;
235 if (read_cache() < 0) {
237 die("invalid cache");
238 }
239 for (i = 1; i < argc; i++) {
241 const char *arg = argv[i];
242 if (!force_filename) {
243 if (!strcmp(arg, "-a")) {
244 checkout_all(base_dir);
245 continue;
246 }
247 if (!strcmp(arg, "--")) {
248 force_filename = 1;
249 continue;
250 }
251 if (!strcmp(arg, "-f")) {
252 force = 1;
253 continue;
254 }
255 if (!strcmp(arg, "-q")) {
256 quiet = 1;
257 continue;
258 }
259 if (!strcmp(arg, "-n")) {
260 not_new = 1;
261 continue;
262 }
263 if (!strcmp(arg, "-u")) {
264 refresh_cache = 1;
265 if (newfd < 0)
266 newfd = hold_index_file_for_update
267 (&cache_file,
268 get_index_file());
269 if (newfd < 0)
270 die("cannot open index.lock file.");
271 continue;
272 }
273 if (!memcmp(arg, "--prefix=", 9)) {
274 base_dir = arg+9;
275 continue;
276 }
277 }
278 if (base_dir[0]) {
279 /* when --prefix is specified we do not
280 * want to update cache.
281 */
282 if (refresh_cache) {
283 close(newfd); newfd = -1;
284 rollback_index_file(&cache_file);
285 }
286 refresh_cache = 0;
287 }
288 checkout_file(arg, base_dir);
289 }
290 if (0 <= newfd &&
292 (write_cache(newfd, active_cache, active_nr) ||
293 commit_index_file(&cache_file)))
294 die("Unable to write new cachefile");
295 return 0;
296}