1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "commit.h"
6#include "fetch.h"
7static int use_link = 0;
9static int use_symlink = 0;
10static int use_filecopy = 1;
11static char *path; /* "Remote" git repository */
13void prefetch(unsigned char *sha1)
15{
16}
17static struct packed_git *packs = NULL;
19static void setup_index(unsigned char *sha1)
21{
22 struct packed_git *new_pack;
23 char filename[PATH_MAX];
24 strcpy(filename, path);
25 strcat(filename, "/objects/pack/pack-");
26 strcat(filename, sha1_to_hex(sha1));
27 strcat(filename, ".idx");
28 new_pack = parse_pack_index_file(sha1, filename);
29 new_pack->next = packs;
30 packs = new_pack;
31}
32static int setup_indices(void)
34{
35 DIR *dir;
36 struct dirent *de;
37 char filename[PATH_MAX];
38 unsigned char sha1[20];
39 sprintf(filename, "%s/objects/pack/", path);
40 dir = opendir(filename);
41 if (!dir)
42 return -1;
43 while ((de = readdir(dir)) != NULL) {
44 int namelen = strlen(de->d_name);
45 if (namelen != 50 ||
46 strcmp(de->d_name + namelen - 5, ".pack"))
47 continue;
48 get_sha1_hex(de->d_name + 5, sha1);
49 setup_index(sha1);
50 }
51 closedir(dir);
52 return 0;
53}
54static int copy_file(const char *source, char *dest, const char *hex,
56 int warn_if_not_exists)
57{
58 safe_create_leading_directories(dest);
59 if (use_link) {
60 if (!link(source, dest)) {
61 pull_say("link %s\n", hex);
62 return 0;
63 }
64 /* If we got ENOENT there is no point continuing. */
65 if (errno == ENOENT) {
66 if (warn_if_not_exists)
67 fprintf(stderr, "does not exist %s\n", source);
68 return -1;
69 }
70 }
71 if (use_symlink) {
72 struct stat st;
73 if (stat(source, &st)) {
74 if (!warn_if_not_exists && errno == ENOENT)
75 return -1;
76 fprintf(stderr, "cannot stat %s: %s\n", source,
77 strerror(errno));
78 return -1;
79 }
80 if (!symlink(source, dest)) {
81 pull_say("symlink %s\n", hex);
82 return 0;
83 }
84 }
85 if (use_filecopy) {
86 int ifd, ofd, status;
87 struct stat st;
88 void *map;
89 ifd = open(source, O_RDONLY);
90 if (ifd < 0 || fstat(ifd, &st) < 0) {
91 int err = errno;
92 if (ifd >= 0)
93 close(ifd);
94 if (!warn_if_not_exists && err == ENOENT)
95 return -1;
96 fprintf(stderr, "cannot open %s\n", source);
97 return -1;
98 }
99 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
100 close(ifd);
101 if (map == MAP_FAILED) {
102 fprintf(stderr, "cannot mmap %s\n", source);
103 return -1;
104 }
105 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
106 status = ((ofd < 0) ||
107 (write(ofd, map, st.st_size) != st.st_size));
108 munmap(map, st.st_size);
109 if (ofd >= 0)
110 close(ofd);
111 if (status)
112 fprintf(stderr, "cannot write %s\n", dest);
113 else
114 pull_say("copy %s\n", hex);
115 return status;
116 }
117 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
118 return -1;
119}
120static int fetch_pack(const unsigned char *sha1)
122{
123 struct packed_git *target;
124 char filename[PATH_MAX];
125 if (setup_indices())
126 return -1;
127 target = find_sha1_pack(sha1, packs);
128 if (!target)
129 return error("Couldn't find %s: not separate or in any pack",
130 sha1_to_hex(sha1));
131 if (get_verbosely) {
132 fprintf(stderr, "Getting pack %s\n",
133 sha1_to_hex(target->sha1));
134 fprintf(stderr, " which contains %s\n",
135 sha1_to_hex(sha1));
136 }
137 sprintf(filename, "%s/objects/pack/pack-%s.pack",
138 path, sha1_to_hex(target->sha1));
139 copy_file(filename, sha1_pack_name(target->sha1),
140 sha1_to_hex(target->sha1), 1);
141 sprintf(filename, "%s/objects/pack/pack-%s.idx",
142 path, sha1_to_hex(target->sha1));
143 copy_file(filename, sha1_pack_index_name(target->sha1),
144 sha1_to_hex(target->sha1), 1);
145 install_packed_git(target);
146 return 0;
147}
148static int fetch_file(const unsigned char *sha1)
150{
151 static int object_name_start = -1;
152 static char filename[PATH_MAX];
153 char *hex = sha1_to_hex(sha1);
154 char *dest_filename = sha1_file_name(sha1);
155 if (object_name_start < 0) {
157 strcpy(filename, path); /* e.g. git.git */
158 strcat(filename, "/objects/");
159 object_name_start = strlen(filename);
160 }
161 filename[object_name_start+0] = hex[0];
162 filename[object_name_start+1] = hex[1];
163 filename[object_name_start+2] = '/';
164 strcpy(filename + object_name_start + 3, hex + 2);
165 return copy_file(filename, dest_filename, hex, 0);
166}
167int fetch(unsigned char *sha1)
169{
170 if (has_sha1_file(sha1))
171 return 0;
172 else
173 return fetch_file(sha1) && fetch_pack(sha1);
174}
175int fetch_ref(char *ref, unsigned char *sha1)
177{
178 static int ref_name_start = -1;
179 static char filename[PATH_MAX];
180 static char hex[41];
181 int ifd;
182 if (ref_name_start < 0) {
184 sprintf(filename, "%s/refs/", path);
185 ref_name_start = strlen(filename);
186 }
187 strcpy(filename + ref_name_start, ref);
188 ifd = open(filename, O_RDONLY);
189 if (ifd < 0) {
190 close(ifd);
191 fprintf(stderr, "cannot open %s\n", filename);
192 return -1;
193 }
194 if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
195 close(ifd);
196 fprintf(stderr, "cannot read from %s\n", filename);
197 return -1;
198 }
199 close(ifd);
200 pull_say("ref %s\n", sha1_to_hex(sha1));
201 return 0;
202}
203static const char local_pull_usage[] =
205"git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
206/*
208 * By default we only use file copy.
209 * If -l is specified, a hard link is attempted.
210 * If -s is specified, then a symlink is attempted.
211 * If -n is _not_ specified, then a regular file-to-file copy is done.
212 */
213int main(int argc, char **argv)
214{
215 char *commit_id;
216 int arg = 1;
217 while (arg < argc && argv[arg][0] == '-') {
219 if (argv[arg][1] == 't')
220 get_tree = 1;
221 else if (argv[arg][1] == 'c')
222 get_history = 1;
223 else if (argv[arg][1] == 'a') {
224 get_all = 1;
225 get_tree = 1;
226 get_history = 1;
227 }
228 else if (argv[arg][1] == 'l')
229 use_link = 1;
230 else if (argv[arg][1] == 's')
231 use_symlink = 1;
232 else if (argv[arg][1] == 'n')
233 use_filecopy = 0;
234 else if (argv[arg][1] == 'v')
235 get_verbosely = 1;
236 else if (argv[arg][1] == 'w')
237 write_ref = argv[++arg];
238 else if (!strcmp(argv[arg], "--recover"))
239 get_recover = 1;
240 else
241 usage(local_pull_usage);
242 arg++;
243 }
244 if (argc < arg + 2)
245 usage(local_pull_usage);
246 commit_id = argv[arg];
247 path = argv[arg + 1];
248 if (pull(commit_id))
250 return 1;
251 return 0;
253}