summaryrefslogtreecommitdiff
path: root/local-fetch.c
blob: b3947a96574774c6a2aa17fa4f181a8b6c55838f (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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*
 * Copyright (C) 2005 Junio C Hamano
 */
#include "cache.h"
#include "commit.h"
#include "fetch.h"
 
static int use_link = 0;
static int use_symlink = 0;
static int use_filecopy = 1;
 
static char *path; /* "Remote" git repository */
 
void prefetch(unsigned char *sha1)
{
}
 
static struct packed_git *packs = NULL;
 
static void setup_index(unsigned char *sha1)
{
	struct packed_git *new_pack;
	char filename[PATH_MAX];
	strcpy(filename, path);
	strcat(filename, "/objects/pack/pack-");
	strcat(filename, sha1_to_hex(sha1));
	strcat(filename, ".idx");
	new_pack = parse_pack_index_file(sha1, filename);
	new_pack->next = packs;
	packs = new_pack;
}
 
static int setup_indices(void)
{
	DIR *dir;
	struct dirent *de;
	char filename[PATH_MAX];
	unsigned char sha1[20];
	sprintf(filename, "%s/objects/pack/", path);
	dir = opendir(filename);
	if (!dir)
		return -1;
	while ((de = readdir(dir)) != NULL) {
		int namelen = strlen(de->d_name);
		if (namelen != 50 || 
		    strcmp(de->d_name + namelen - 5, ".pack"))
			continue;
		get_sha1_hex(de->d_name + 5, sha1);
		setup_index(sha1);
	}
	closedir(dir);
	return 0;
}
 
static int copy_file(const char *source, const char *dest, const char *hex)
{
	if (use_link) {
		if (!link(source, dest)) {
			pull_say("link %s\n", hex);
			return 0;
		}
		/* If we got ENOENT there is no point continuing. */
		if (errno == ENOENT) {
			fprintf(stderr, "does not exist %s\n", source);
			return -1;
		}
	}
	if (use_symlink && !symlink(source, dest)) {
		pull_say("symlink %s\n", hex);
		return 0;
	}
	if (use_filecopy) {
		int ifd, ofd, status;
		struct stat st;
		void *map;
		ifd = open(source, O_RDONLY);
		if (ifd < 0 || fstat(ifd, &st) < 0) {
			close(ifd);
			fprintf(stderr, "cannot open %s\n", source);
			return -1;
		}
		map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
		close(ifd);
		if (map == MAP_FAILED) {
			fprintf(stderr, "cannot mmap %s\n", source);
			return -1;
		}
		ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
		status = ((ofd < 0) ||
			  (write(ofd, map, st.st_size) != st.st_size));
		munmap(map, st.st_size);
		close(ofd);
		if (status)
			fprintf(stderr, "cannot write %s\n", dest);
		else
			pull_say("copy %s\n", hex);
		return status;
	}
	fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
	return -1;
}
 
static int fetch_pack(const unsigned char *sha1)
{
	struct packed_git *target;
	char filename[PATH_MAX];
	if (setup_indices())
		return -1;
	target = find_sha1_pack(sha1, packs);
	if (!target)
		return error("Couldn't find %s: not separate or in any pack", 
			     sha1_to_hex(sha1));
	if (get_verbosely) {
		fprintf(stderr, "Getting pack %s\n",
			sha1_to_hex(target->sha1));
		fprintf(stderr, " which contains %s\n",
			sha1_to_hex(sha1));
	}
	sprintf(filename, "%s/objects/pack/pack-%s.pack", 
		path, sha1_to_hex(target->sha1));
	copy_file(filename, sha1_pack_name(target->sha1),
		  sha1_to_hex(target->sha1));
	sprintf(filename, "%s/objects/pack/pack-%s.idx", 
		path, sha1_to_hex(target->sha1));
	copy_file(filename, sha1_pack_index_name(target->sha1),
		  sha1_to_hex(target->sha1));
	install_packed_git(target);
	return 0;
}
 
static int fetch_file(const unsigned char *sha1)
{
	static int object_name_start = -1;
	static char filename[PATH_MAX];
	char *hex = sha1_to_hex(sha1);
	const char *dest_filename = sha1_file_name(sha1);
 
 	if (object_name_start < 0) {
		strcpy(filename, path); /* e.g. git.git */
		strcat(filename, "/objects/");
		object_name_start = strlen(filename);
	}
	filename[object_name_start+0] = hex[0];
	filename[object_name_start+1] = hex[1];
	filename[object_name_start+2] = '/';
	strcpy(filename + object_name_start + 3, hex + 2);
	return copy_file(filename, dest_filename, hex);
}
 
int fetch(unsigned char *sha1)
{
	return fetch_file(sha1) && fetch_pack(sha1);
}
 
int fetch_ref(char *ref, unsigned char *sha1)
{
	static int ref_name_start = -1;
	static char filename[PATH_MAX];
	static char hex[41];
	int ifd;
 
	if (ref_name_start < 0) {
		sprintf(filename, "%s/refs/", path);
		ref_name_start = strlen(filename);
	}
	strcpy(filename + ref_name_start, ref);
	ifd = open(filename, O_RDONLY);
	if (ifd < 0) {
		close(ifd);
		fprintf(stderr, "cannot open %s\n", filename);
		return -1;
	}
	if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
		close(ifd);
		fprintf(stderr, "cannot read from %s\n", filename);
		return -1;
	}
	close(ifd);
	pull_say("ref %s\n", sha1_to_hex(sha1));
	return 0;
}
 
static const char local_pull_usage[] =
"git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 
/* 
 * By default we only use file copy.
 * If -l is specified, a hard link is attempted.
 * If -s is specified, then a symlink is attempted.
 * If -n is _not_ specified, then a regular file-to-file copy is done.
 */
int main(int argc, char **argv)
{
	char *commit_id;
	int arg = 1;
 
	while (arg < argc && argv[arg][0] == '-') {
		if (argv[arg][1] == 't')
			get_tree = 1;
		else if (argv[arg][1] == 'c')
			get_history = 1;
		else if (argv[arg][1] == 'a') {
			get_all = 1;
			get_tree = 1;
			get_history = 1;
		}
		else if (argv[arg][1] == 'l')
			use_link = 1;
		else if (argv[arg][1] == 's')
			use_symlink = 1;
		else if (argv[arg][1] == 'n')
			use_filecopy = 0;
		else if (argv[arg][1] == 'v')
			get_verbosely = 1;
		else if (argv[arg][1] == 'w')
			write_ref = argv[++arg];
		else
			usage(local_pull_usage);
		arg++;
	}
	if (argc < arg + 2)
		usage(local_pull_usage);
	commit_id = argv[arg];
	path = argv[arg + 1];
 
	if (pull(commit_id))
		return 1;
 
	return 0;
}