summaryrefslogtreecommitdiff
path: root/checkout-cache.c
blob: cfbc47ee2db059092fc432865269b82943dfa084 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * Check-out files from the "current cache directory"
 *
 * Copyright (C) 2005 Linus Torvalds
 *
 * Careful: order of argument flags does matter. For example,
 *
 *	checkout-cache -a -f file.c
 *
 * Will first check out all files listed in the cache (but not
 * overwrite any old ones), and then force-checkout "file.c" a
 * second time (ie that one _will_ overwrite any old contents
 * with the same filename).
 *
 * Also, just doing "checkout-cache" does nothing. You probably
 * meant "checkout-cache -a". And if you want to force it, you
 * want "checkout-cache -f -a".
 *
 * Intuitiveness is not the goal here. Repeatability is. The
 * reason for the "no arguments means no work" thing is that
 * from scripts you are supposed to be able to do things like
 *
 *	find . -name '*.h' -print0 | xargs -0 checkout-cache -f --
 *
 * which will force all existing *.h files to be replaced with
 * their cached copies. If an empty command line implied "all",
 * then this would force-refresh everything in the cache, which
 * was not the point.
 *
 * Oh, and the "--" is just a good idea when you know the rest
 * will be filenames. Just so that you wouldn't have a filename
 * of "-a" causing problems (not possible in the above example,
 * but get used to it in scripting!).
 */
#include "cache.h"
 
static int force = 0, quiet = 0;
 
static void create_directories(const char *path)
{
	int len = strlen(path);
	char *buf = malloc(len + 1);
	const char *slash = path;
 
	while ((slash = strchr(slash+1, '/')) != NULL) {
		len = slash - path;
		memcpy(buf, path, len);
		buf[len] = 0;
		mkdir(buf, 0700);
	}
}
 
static int create_file(const char *path, unsigned int mode)
{
	int fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
	if (fd < 0) {
		if (errno == ENOENT) {
			create_directories(path);
			fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
		}
	}
	if (fd >= 0)
		fchmod(fd, mode);
	return fd;
}
 
static int write_entry(struct cache_entry *ce)
{
	int fd;
	void *new;
	unsigned long size;
	long wrote;
	char type[20];
 
	new = read_sha1_file(ce->sha1, type, &size);
	if (!new || strcmp(type, "blob")) {
		fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
			ce->name, sha1_to_hex(ce->sha1));
		return -1;
	}
	fd = create_file(ce->name, ce->st_mode);
	if (fd < 0) {
		fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
			ce->name, strerror(errno));
		free(new);
		return -1;
	}
	wrote = write(fd, new, size);
	close(fd);
	free(new);
	if (wrote == size)
		return 0;
	fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
	return -1;
}
 
static int checkout_entry(struct cache_entry *ce)
{
	if (!force) {
		struct stat st;
 
		if (!stat(ce->name, &st)) {
			unsigned changed = cache_match_stat(ce, &st);
			if (changed && !quiet)
				fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
			return 0;
		}
	}
	return write_entry(ce);
}
 
static int checkout_file(const char *name)
{
	int pos = cache_name_pos(name, strlen(name));
	if (pos < 0) {
		if (!quiet)
			fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
		return -1;
	}
	return checkout_entry(active_cache[pos]);
}
 
static int checkout_all(void)
{
	int i;
 
	for (i = 0; i < active_nr ; i++) {
		struct cache_entry *ce = active_cache[i];
		if (checkout_entry(ce) < 0)
			return -1;
	}
	return 0;
}
 
int main(int argc, char **argv)
{
	int i, force_filename = 0;
 
	if (read_cache() < 0) {
		fprintf(stderr, "Invalid cache\n");
		exit(1);
	}
 
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (!force_filename) {
			if (!strcmp(arg, "-a")) {
				checkout_all();
				continue;
			}
			if (!strcmp(arg, "--")) {
				force_filename = 1;
				continue;
			}
			if (!strcmp(arg, "-f")) {
				force = 1;
				continue;
			}
			if (!strcmp(arg, "-q")) {
				quiet = 1;
				continue;
			}
		}
		checkout_file(arg);
	}
	return 0;
}