git-diff-cache: add "-m" flag to match all non-checked-out files with the index.
[git/git.git] / checkout-cache.c
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 "cache.h"
36
37 static int force = 0, quiet = 0, not_new = 0;
38
39 static void create_directories(const char *path)
40 {
41 int len = strlen(path);
42 char *buf = xmalloc(len + 1);
43 const char *slash = path;
44
45 while ((slash = strchr(slash+1, '/')) != NULL) {
46 len = slash - path;
47 memcpy(buf, path, len);
48 buf[len] = 0;
49 mkdir(buf, 0755);
50 }
51 }
52
53 static int create_file(const char *path, unsigned int mode)
54 {
55 int fd;
56
57 mode = (mode & 0100) ? 0777 : 0666;
58 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
59 if (fd < 0) {
60 if (errno == ENOENT) {
61 create_directories(path);
62 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
63 }
64 }
65 return fd;
66 }
67
68 static int write_entry(struct cache_entry *ce, const char *path)
69 {
70 int fd;
71 void *new;
72 unsigned long size;
73 long wrote;
74 char type[20];
75 char target[1024];
76
77 new = read_sha1_file(ce->sha1, type, &size);
78 if (!new || strcmp(type, "blob")) {
79 return error("checkout-cache: unable to read sha1 file of %s (%s)",
80 path, sha1_to_hex(ce->sha1));
81 }
82 switch (ntohl(ce->ce_mode) & S_IFMT) {
83 case S_IFREG:
84 fd = create_file(path, ntohl(ce->ce_mode));
85 if (fd < 0) {
86 free(new);
87 return error("checkout-cache: unable to create file %s (%s)",
88 path, strerror(errno));
89 }
90 wrote = write(fd, new, size);
91 close(fd);
92 free(new);
93 if (wrote != size)
94 return error("checkout-cache: unable to write file %s", path);
95 break;
96 case S_IFLNK:
97 memcpy(target, new, size);
98 target[size] = '\0';
99 if (symlink(target, path)) {
100 free(new);
101 return error("checkout-cache: unable to create symlink %s (%s)",
102 path, strerror(errno));
103 }
104 free(new);
105 break;
106 default:
107 free(new);
108 return error("checkout-cache: unknown file mode for %s", path);
109 }
110 return 0;
111 }
112
113 static int checkout_entry(struct cache_entry *ce, const char *base_dir)
114 {
115 struct stat st;
116 static char path[MAXPATHLEN+1];
117 int len = strlen(base_dir);
118
119 memcpy(path, base_dir, len);
120 strcpy(path + len, ce->name);
121
122 if (!lstat(path, &st)) {
123 unsigned changed = cache_match_stat(ce, &st);
124 if (!changed)
125 return 0;
126 if (!force) {
127 if (!quiet)
128 fprintf(stderr, "checkout-cache: %s already exists\n", path);
129 return 0;
130 }
131
132 /*
133 * We unlink the old file, to get the new one with the
134 * right permissions (including umask, which is nasty
135 * to emulate by hand - much easier to let the system
136 * just do the right thing)
137 */
138 unlink(path);
139 } else if (not_new)
140 return 0;
141 return write_entry(ce, path);
142 }
143
144 static int checkout_file(const char *name, const char *base_dir)
145 {
146 int pos = cache_name_pos(name, strlen(name));
147 if (pos < 0) {
148 if (!quiet) {
149 pos = -pos - 1;
150 fprintf(stderr,
151 "checkout-cache: %s is %s.\n",
152 name,
153 (pos < active_nr &&
154 !strcmp(active_cache[pos]->name, name)) ?
155 "unmerged" : "not in the cache");
156 }
157 return -1;
158 }
159 return checkout_entry(active_cache[pos], base_dir);
160 }
161
162 static int checkout_all(const char *base_dir)
163 {
164 int i;
165
166 for (i = 0; i < active_nr ; i++) {
167 struct cache_entry *ce = active_cache[i];
168 if (ce_stage(ce))
169 continue;
170 if (checkout_entry(ce, base_dir) < 0)
171 return -1;
172 }
173 return 0;
174 }
175
176 int main(int argc, char **argv)
177 {
178 int i, force_filename = 0;
179 const char *base_dir = "";
180
181 if (read_cache() < 0) {
182 die("invalid cache");
183 }
184
185 for (i = 1; i < argc; i++) {
186 const char *arg = argv[i];
187 if (!force_filename) {
188 if (!strcmp(arg, "-a")) {
189 checkout_all(base_dir);
190 continue;
191 }
192 if (!strcmp(arg, "--")) {
193 force_filename = 1;
194 continue;
195 }
196 if (!strcmp(arg, "-f")) {
197 force = 1;
198 continue;
199 }
200 if (!strcmp(arg, "-q")) {
201 quiet = 1;
202 continue;
203 }
204 if (!strcmp(arg, "-n")) {
205 not_new = 1;
206 continue;
207 }
208 if (!memcmp(arg, "--prefix=", 9)) {
209 base_dir = arg+9;
210 continue;
211 }
212 }
213 checkout_file(arg, base_dir);
214 }
215 return 0;
216 }