a3e35f9c81730ec149bf37cb19d7dbb4570a3197
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, const char *dest, const char *hex)
56{
57 if (use_link) {
58 if (!link(source, dest)) {
59 pull_say("link %s\n", hex);
60 return 0;
61 }
62 /* If we got ENOENT there is no point continuing. */
63 if (errno == ENOENT) {
64 fprintf(stderr, "does not exist %s\n", source);
65 return -1;
66 }
67 }
68 if (use_symlink && !symlink(source, dest)) {
69 pull_say("symlink %s\n", hex);
70 return 0;
71 }
72 if (use_filecopy) {
73 int ifd, ofd, status;
74 struct stat st;
75 void *map;
76 ifd = open(source, O_RDONLY);
77 if (ifd < 0 || fstat(ifd, &st) < 0) {
78 if (ifd >= 0)
79 close(ifd);
80 fprintf(stderr, "cannot open %s\n", source);
81 return -1;
82 }
83 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
84 close(ifd);
85 if (map == MAP_FAILED) {
86 fprintf(stderr, "cannot mmap %s\n", source);
87 return -1;
88 }
89 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
90 status = ((ofd < 0) ||
91 (write(ofd, map, st.st_size) != st.st_size));
92 munmap(map, st.st_size);
93 if (ofd >= 0)
94 close(ofd);
95 if (status)
96 fprintf(stderr, "cannot write %s\n", dest);
97 else
98 pull_say("copy %s\n", hex);
99 return status;
100 }
101 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
102 return -1;
103}
104static int fetch_pack(const unsigned char *sha1)
106{
107 struct packed_git *target;
108 char filename[PATH_MAX];
109 if (setup_indices())
110 return -1;
111 target = find_sha1_pack(sha1, packs);
112 if (!target)
113 return error("Couldn't find %s: not separate or in any pack",
114 sha1_to_hex(sha1));
115 if (get_verbosely) {
116 fprintf(stderr, "Getting pack %s\n",
117 sha1_to_hex(target->sha1));
118 fprintf(stderr, " which contains %s\n",
119 sha1_to_hex(sha1));
120 }
121 sprintf(filename, "%s/objects/pack/pack-%s.pack",
122 path, sha1_to_hex(target->sha1));
123 copy_file(filename, sha1_pack_name(target->sha1),
124 sha1_to_hex(target->sha1));
125 sprintf(filename, "%s/objects/pack/pack-%s.idx",
126 path, sha1_to_hex(target->sha1));
127 copy_file(filename, sha1_pack_index_name(target->sha1),
128 sha1_to_hex(target->sha1));
129 install_packed_git(target);
130 return 0;
131}
132static int fetch_file(const unsigned char *sha1)
134{
135 static int object_name_start = -1;
136 static char filename[PATH_MAX];
137 char *hex = sha1_to_hex(sha1);
138 const char *dest_filename = sha1_file_name(sha1);
139 if (object_name_start < 0) {
141 strcpy(filename, path); /* e.g. git.git */
142 strcat(filename, "/objects/");
143 object_name_start = strlen(filename);
144 }
145 filename[object_name_start+0] = hex[0];
146 filename[object_name_start+1] = hex[1];
147 filename[object_name_start+2] = '/';
148 strcpy(filename + object_name_start + 3, hex + 2);
149 return copy_file(filename, dest_filename, hex);
150}
151int fetch(unsigned char *sha1)
153{
154 return fetch_file(sha1) && fetch_pack(sha1);
155}
156int fetch_ref(char *ref, unsigned char *sha1)
158{
159 static int ref_name_start = -1;
160 static char filename[PATH_MAX];
161 static char hex[41];
162 int ifd;
163 if (ref_name_start < 0) {
165 sprintf(filename, "%s/refs/", path);
166 ref_name_start = strlen(filename);
167 }
168 strcpy(filename + ref_name_start, ref);
169 ifd = open(filename, O_RDONLY);
170 if (ifd < 0) {
171 close(ifd);
172 fprintf(stderr, "cannot open %s\n", filename);
173 return -1;
174 }
175 if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
176 close(ifd);
177 fprintf(stderr, "cannot read from %s\n", filename);
178 return -1;
179 }
180 close(ifd);
181 pull_say("ref %s\n", sha1_to_hex(sha1));
182 return 0;
183}
184static const char local_pull_usage[] =
186"git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
187/*
189 * By default we only use file copy.
190 * If -l is specified, a hard link is attempted.
191 * If -s is specified, then a symlink is attempted.
192 * If -n is _not_ specified, then a regular file-to-file copy is done.
193 */
194int main(int argc, char **argv)
195{
196 char *commit_id;
197 int arg = 1;
198 while (arg < argc && argv[arg][0] == '-') {
200 if (argv[arg][1] == 't')
201 get_tree = 1;
202 else if (argv[arg][1] == 'c')
203 get_history = 1;
204 else if (argv[arg][1] == 'a') {
205 get_all = 1;
206 get_tree = 1;
207 get_history = 1;
208 }
209 else if (argv[arg][1] == 'l')
210 use_link = 1;
211 else if (argv[arg][1] == 's')
212 use_symlink = 1;
213 else if (argv[arg][1] == 'n')
214 use_filecopy = 0;
215 else if (argv[arg][1] == 'v')
216 get_verbosely = 1;
217 else if (argv[arg][1] == 'w')
218 write_ref = argv[++arg];
219 else
220 usage(local_pull_usage);
221 arg++;
222 }
223 if (argc < arg + 2)
224 usage(local_pull_usage);
225 commit_id = argv[arg];
226 path = argv[arg + 1];
227 if (pull(commit_id))
229 return 1;
230 return 0;
232}