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 while ((de = readdir(dir)) != NULL) {
42 int namelen = strlen(de->d_name);
43 if (namelen != 50 ||
44 strcmp(de->d_name + namelen - 5, ".pack"))
45 continue;
46 get_sha1_hex(de->d_name + 5, sha1);
47 setup_index(sha1);
48 }
49 return 0;
50}
51static int copy_file(const char *source, const char *dest, const char *hex)
53{
54 if (use_link) {
55 if (!link(source, dest)) {
56 pull_say("link %s\n", hex);
57 return 0;
58 }
59 /* If we got ENOENT there is no point continuing. */
60 if (errno == ENOENT) {
61 fprintf(stderr, "does not exist %s\n", source);
62 return -1;
63 }
64 }
65 if (use_symlink && !symlink(source, dest)) {
66 pull_say("symlink %s\n", hex);
67 return 0;
68 }
69 if (use_filecopy) {
70 int ifd, ofd, status;
71 struct stat st;
72 void *map;
73 ifd = open(source, O_RDONLY);
74 if (ifd < 0 || fstat(ifd, &st) < 0) {
75 close(ifd);
76 fprintf(stderr, "cannot open %s\n", source);
77 return -1;
78 }
79 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
80 close(ifd);
81 if (map == MAP_FAILED) {
82 fprintf(stderr, "cannot mmap %s\n", source);
83 return -1;
84 }
85 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
86 status = ((ofd < 0) ||
87 (write(ofd, map, st.st_size) != st.st_size));
88 munmap(map, st.st_size);
89 close(ofd);
90 if (status)
91 fprintf(stderr, "cannot write %s\n", dest);
92 else
93 pull_say("copy %s\n", hex);
94 return status;
95 }
96 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
97 return -1;
98}
99static int fetch_pack(const unsigned char *sha1)
101{
102 struct packed_git *target;
103 char filename[PATH_MAX];
104 if (setup_indices())
105 return -1;
106 target = find_sha1_pack(sha1, packs);
107 if (!target)
108 return error("Couldn't find %s: not separate or in any pack",
109 sha1_to_hex(sha1));
110 if (get_verbosely) {
111 fprintf(stderr, "Getting pack %s\n",
112 sha1_to_hex(target->sha1));
113 fprintf(stderr, " which contains %s\n",
114 sha1_to_hex(sha1));
115 }
116 sprintf(filename, "%s/objects/pack/pack-%s.pack",
117 path, sha1_to_hex(target->sha1));
118 copy_file(filename, sha1_pack_name(target->sha1),
119 sha1_to_hex(target->sha1));
120 sprintf(filename, "%s/objects/pack/pack-%s.idx",
121 path, sha1_to_hex(target->sha1));
122 copy_file(filename, sha1_pack_index_name(target->sha1),
123 sha1_to_hex(target->sha1));
124 install_packed_git(target);
125 return 0;
126}
127static int fetch_file(const unsigned char *sha1)
129{
130 static int object_name_start = -1;
131 static char filename[PATH_MAX];
132 char *hex = sha1_to_hex(sha1);
133 const char *dest_filename = sha1_file_name(sha1);
134 if (object_name_start < 0) {
136 strcpy(filename, path); /* e.g. git.git */
137 strcat(filename, "/objects/");
138 object_name_start = strlen(filename);
139 }
140 filename[object_name_start+0] = hex[0];
141 filename[object_name_start+1] = hex[1];
142 filename[object_name_start+2] = '/';
143 strcpy(filename + object_name_start + 3, hex + 2);
144 return copy_file(filename, dest_filename, hex);
145}
146int fetch(unsigned char *sha1)
148{
149 return fetch_file(sha1) && fetch_pack(sha1);
150}
151int fetch_ref(char *ref, unsigned char *sha1)
153{
154 static int ref_name_start = -1;
155 static char filename[PATH_MAX];
156 static char hex[41];
157 int ifd;
158 if (ref_name_start < 0) {
160 sprintf(filename, "%s/refs/", path);
161 ref_name_start = strlen(filename);
162 }
163 strcpy(filename + ref_name_start, ref);
164 ifd = open(filename, O_RDONLY);
165 if (ifd < 0) {
166 close(ifd);
167 fprintf(stderr, "cannot open %s\n", filename);
168 return -1;
169 }
170 if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
171 close(ifd);
172 fprintf(stderr, "cannot read from %s\n", filename);
173 return -1;
174 }
175 close(ifd);
176 pull_say("ref %s\n", sha1_to_hex(sha1));
177 return 0;
178}
179static const char local_pull_usage[] =
181"git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
182/*
184 * By default we only use file copy.
185 * If -l is specified, a hard link is attempted.
186 * If -s is specified, then a symlink is attempted.
187 * If -n is _not_ specified, then a regular file-to-file copy is done.
188 */
189int main(int argc, char **argv)
190{
191 char *commit_id;
192 int arg = 1;
193 while (arg < argc && argv[arg][0] == '-') {
195 if (argv[arg][1] == 't')
196 get_tree = 1;
197 else if (argv[arg][1] == 'c')
198 get_history = 1;
199 else if (argv[arg][1] == 'a') {
200 get_all = 1;
201 get_tree = 1;
202 get_history = 1;
203 }
204 else if (argv[arg][1] == 'l')
205 use_link = 1;
206 else if (argv[arg][1] == 's')
207 use_symlink = 1;
208 else if (argv[arg][1] == 'n')
209 use_filecopy = 0;
210 else if (argv[arg][1] == 'v')
211 get_verbosely = 1;
212 else if (argv[arg][1] == 'w')
213 write_ref = argv[++arg];
214 else
215 usage(local_pull_usage);
216 arg++;
217 }
218 if (argc < arg + 2)
219 usage(local_pull_usage);
220 commit_id = argv[arg];
221 path = argv[arg + 1];
222 if (pull(commit_id))
224 return 1;
225 return 0;
227}