remove unnecessary initializations
[git/git.git] / local-fetch.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "commit.h"
6 #include "fetch.h"
7
8 static int use_link;
9 static int use_symlink;
10 static int use_filecopy = 1;
11 static int commits_on_stdin;
12
13 static const char *path; /* "Remote" git repository */
14
15 void prefetch(unsigned char *sha1)
16 {
17 }
18
19 static struct packed_git *packs;
20
21 static void setup_index(unsigned char *sha1)
22 {
23 struct packed_git *new_pack;
24 char filename[PATH_MAX];
25 strcpy(filename, path);
26 strcat(filename, "/objects/pack/pack-");
27 strcat(filename, sha1_to_hex(sha1));
28 strcat(filename, ".idx");
29 new_pack = parse_pack_index_file(sha1, filename);
30 new_pack->next = packs;
31 packs = new_pack;
32 }
33
34 static int setup_indices(void)
35 {
36 DIR *dir;
37 struct dirent *de;
38 char filename[PATH_MAX];
39 unsigned char sha1[20];
40 sprintf(filename, "%s/objects/pack/", path);
41 dir = opendir(filename);
42 if (!dir)
43 return -1;
44 while ((de = readdir(dir)) != NULL) {
45 int namelen = strlen(de->d_name);
46 if (namelen != 50 ||
47 !has_extension(de->d_name, ".pack"))
48 continue;
49 get_sha1_hex(de->d_name + 5, sha1);
50 setup_index(sha1);
51 }
52 closedir(dir);
53 return 0;
54 }
55
56 static int copy_file(const char *source, char *dest, const char *hex,
57 int warn_if_not_exists)
58 {
59 safe_create_leading_directories(dest);
60 if (use_link) {
61 if (!link(source, dest)) {
62 pull_say("link %s\n", hex);
63 return 0;
64 }
65 /* If we got ENOENT there is no point continuing. */
66 if (errno == ENOENT) {
67 if (warn_if_not_exists)
68 fprintf(stderr, "does not exist %s\n", source);
69 return -1;
70 }
71 }
72 if (use_symlink) {
73 struct stat st;
74 if (stat(source, &st)) {
75 if (!warn_if_not_exists && errno == ENOENT)
76 return -1;
77 fprintf(stderr, "cannot stat %s: %s\n", source,
78 strerror(errno));
79 return -1;
80 }
81 if (!symlink(source, dest)) {
82 pull_say("symlink %s\n", hex);
83 return 0;
84 }
85 }
86 if (use_filecopy) {
87 int ifd, ofd, status = 0;
88
89 ifd = open(source, O_RDONLY);
90 if (ifd < 0) {
91 if (!warn_if_not_exists && errno == ENOENT)
92 return -1;
93 fprintf(stderr, "cannot open %s\n", source);
94 return -1;
95 }
96 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
97 if (ofd < 0) {
98 fprintf(stderr, "cannot open %s\n", dest);
99 close(ifd);
100 return -1;
101 }
102 status = copy_fd(ifd, ofd);
103 close(ofd);
104 if (status)
105 fprintf(stderr, "cannot write %s\n", dest);
106 else
107 pull_say("copy %s\n", hex);
108 return status;
109 }
110 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
111 return -1;
112 }
113
114 static int fetch_pack(const unsigned char *sha1)
115 {
116 struct packed_git *target;
117 char filename[PATH_MAX];
118 if (setup_indices())
119 return -1;
120 target = find_sha1_pack(sha1, packs);
121 if (!target)
122 return error("Couldn't find %s: not separate or in any pack",
123 sha1_to_hex(sha1));
124 if (get_verbosely) {
125 fprintf(stderr, "Getting pack %s\n",
126 sha1_to_hex(target->sha1));
127 fprintf(stderr, " which contains %s\n",
128 sha1_to_hex(sha1));
129 }
130 sprintf(filename, "%s/objects/pack/pack-%s.pack",
131 path, sha1_to_hex(target->sha1));
132 copy_file(filename, sha1_pack_name(target->sha1),
133 sha1_to_hex(target->sha1), 1);
134 sprintf(filename, "%s/objects/pack/pack-%s.idx",
135 path, sha1_to_hex(target->sha1));
136 copy_file(filename, sha1_pack_index_name(target->sha1),
137 sha1_to_hex(target->sha1), 1);
138 install_packed_git(target);
139 return 0;
140 }
141
142 static int fetch_file(const unsigned char *sha1)
143 {
144 static int object_name_start = -1;
145 static char filename[PATH_MAX];
146 char *hex = sha1_to_hex(sha1);
147 char *dest_filename = sha1_file_name(sha1);
148
149 if (object_name_start < 0) {
150 strcpy(filename, path); /* e.g. git.git */
151 strcat(filename, "/objects/");
152 object_name_start = strlen(filename);
153 }
154 filename[object_name_start+0] = hex[0];
155 filename[object_name_start+1] = hex[1];
156 filename[object_name_start+2] = '/';
157 strcpy(filename + object_name_start + 3, hex + 2);
158 return copy_file(filename, dest_filename, hex, 0);
159 }
160
161 int fetch(unsigned char *sha1)
162 {
163 if (has_sha1_file(sha1))
164 return 0;
165 else
166 return fetch_file(sha1) && fetch_pack(sha1);
167 }
168
169 int fetch_ref(char *ref, unsigned char *sha1)
170 {
171 static int ref_name_start = -1;
172 static char filename[PATH_MAX];
173 static char hex[41];
174 int ifd;
175
176 if (ref_name_start < 0) {
177 sprintf(filename, "%s/refs/", path);
178 ref_name_start = strlen(filename);
179 }
180 strcpy(filename + ref_name_start, ref);
181 ifd = open(filename, O_RDONLY);
182 if (ifd < 0) {
183 close(ifd);
184 fprintf(stderr, "cannot open %s\n", filename);
185 return -1;
186 }
187 if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
188 close(ifd);
189 fprintf(stderr, "cannot read from %s\n", filename);
190 return -1;
191 }
192 close(ifd);
193 pull_say("ref %s\n", sha1_to_hex(sha1));
194 return 0;
195 }
196
197 static const char local_pull_usage[] =
198 "git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";
199
200 /*
201 * By default we only use file copy.
202 * If -l is specified, a hard link is attempted.
203 * If -s is specified, then a symlink is attempted.
204 * If -n is _not_ specified, then a regular file-to-file copy is done.
205 */
206 int main(int argc, const char **argv)
207 {
208 int commits;
209 const char **write_ref = NULL;
210 char **commit_id;
211 int arg = 1;
212
213 setup_ident();
214 setup_git_directory();
215 git_config(git_default_config);
216
217 while (arg < argc && argv[arg][0] == '-') {
218 if (argv[arg][1] == 't')
219 get_tree = 1;
220 else if (argv[arg][1] == 'c')
221 get_history = 1;
222 else if (argv[arg][1] == 'a') {
223 get_all = 1;
224 get_tree = 1;
225 get_history = 1;
226 }
227 else if (argv[arg][1] == 'l')
228 use_link = 1;
229 else if (argv[arg][1] == 's')
230 use_symlink = 1;
231 else if (argv[arg][1] == 'n')
232 use_filecopy = 0;
233 else if (argv[arg][1] == 'v')
234 get_verbosely = 1;
235 else if (argv[arg][1] == 'w')
236 write_ref = &argv[++arg];
237 else if (!strcmp(argv[arg], "--recover"))
238 get_recover = 1;
239 else if (!strcmp(argv[arg], "--stdin"))
240 commits_on_stdin = 1;
241 else
242 usage(local_pull_usage);
243 arg++;
244 }
245 if (argc < arg + 2 - commits_on_stdin)
246 usage(local_pull_usage);
247 if (commits_on_stdin) {
248 commits = pull_targets_stdin(&commit_id, &write_ref);
249 } else {
250 commit_id = (char **) &argv[arg++];
251 commits = 1;
252 }
253 path = argv[arg];
254
255 if (pull(commits, commit_id, write_ref, path))
256 return 1;
257
258 if (commits_on_stdin)
259 pull_targets_free(commits, commit_id, write_ref);
260
261 return 0;
262 }