6ed8b69eca879aed6d25105d29533dc789918e73
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"
37 static int force = 0, quiet = 0;
39 static void create_directories(const char *path)
40 {
41 int len = strlen(path);
42 char *buf = malloc(len + 1);
43 const char *slash = path;
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 }
53 static int create_file(const char *path, unsigned int mode)
54 {
55 int fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
56 if (fd < 0) {
57 if (errno == ENOENT) {
58 create_directories(path);
59 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
60 }
61 }
62 if (fd >= 0)
63 fchmod(fd, mode);
64 return fd;
65 }
67 static int write_entry(struct cache_entry *ce)
68 {
69 int fd;
70 void *new;
71 unsigned long size;
72 long wrote;
73 char type[20];
75 new = read_sha1_file(ce->sha1, type, &size);
76 if (!new || strcmp(type, "blob")) {
77 fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
78 ce->name, sha1_to_hex(ce->sha1));
79 return -1;
80 }
81 fd = create_file(ce->name, ce->st_mode);
82 if (fd < 0) {
83 fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
84 ce->name, strerror(errno));
85 free(new);
86 return -1;
87 }
88 wrote = write(fd, new, size);
89 close(fd);
90 free(new);
91 if (wrote == size)
92 return 0;
93 fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
94 return -1;
95 }
97 static int checkout_entry(struct cache_entry *ce)
98 {
99 struct stat st;
101 if (!stat(ce->name, &st)) {
102 unsigned changed = cache_match_stat(ce, &st);
103 if (!changed)
104 return 0;
105 if (!force) {
106 if (!quiet)
107 fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
108 return 0;
109 }
110 }
111 return write_entry(ce);
112 }
114 static int checkout_file(const char *name)
115 {
116 int pos = cache_name_pos(name, strlen(name));
117 if (pos < 0) {
118 if (!quiet)
119 fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
120 return -1;
121 }
122 return checkout_entry(active_cache[pos]);
123 }
125 static int checkout_all(void)
126 {
127 int i;
129 for (i = 0; i < active_nr ; i++) {
130 struct cache_entry *ce = active_cache[i];
131 if (checkout_entry(ce) < 0)
132 return -1;
133 }
134 return 0;
135 }
137 int main(int argc, char **argv)
138 {
139 int i, force_filename = 0;
141 if (read_cache() < 0) {
142 fprintf(stderr, "Invalid cache\n");
143 exit(1);
144 }
146 for (i = 1; i < argc; i++) {
147 const char *arg = argv[i];
148 if (!force_filename) {
149 if (!strcmp(arg, "-a")) {
150 checkout_all();
151 continue;
152 }
153 if (!strcmp(arg, "--")) {
154 force_filename = 1;
155 continue;
156 }
157 if (!strcmp(arg, "-f")) {
158 force = 1;
159 continue;
160 }
161 if (!strcmp(arg, "-q")) {
162 quiet = 1;
163 continue;
164 }
165 }
166 checkout_file(arg);
167 }
168 return 0;
169 }