Log ref updates made by fetch.
[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 = 0;
9 static int use_symlink = 0;
10 static int use_filecopy = 1;
11
12 static char *path; /* "Remote" git repository */
13
14 void prefetch(unsigned char *sha1)
15 {
16 }
17
18 static struct packed_git *packs = NULL;
19
20 static 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 }
32
33 static 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 }
54
55 static 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 = 0;
87
88 ifd = open(source, O_RDONLY);
89 if (ifd < 0) {
90 if (!warn_if_not_exists && errno == ENOENT)
91 return -1;
92 fprintf(stderr, "cannot open %s\n", source);
93 return -1;
94 }
95 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
96 if (ofd < 0) {
97 fprintf(stderr, "cannot open %s\n", dest);
98 close(ifd);
99 return -1;
100 }
101 status = copy_fd(ifd, ofd);
102 close(ofd);
103 if (status)
104 fprintf(stderr, "cannot write %s\n", dest);
105 else
106 pull_say("copy %s\n", hex);
107 return status;
108 }
109 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
110 return -1;
111 }
112
113 static int fetch_pack(const unsigned char *sha1)
114 {
115 struct packed_git *target;
116 char filename[PATH_MAX];
117 if (setup_indices())
118 return -1;
119 target = find_sha1_pack(sha1, packs);
120 if (!target)
121 return error("Couldn't find %s: not separate or in any pack",
122 sha1_to_hex(sha1));
123 if (get_verbosely) {
124 fprintf(stderr, "Getting pack %s\n",
125 sha1_to_hex(target->sha1));
126 fprintf(stderr, " which contains %s\n",
127 sha1_to_hex(sha1));
128 }
129 sprintf(filename, "%s/objects/pack/pack-%s.pack",
130 path, sha1_to_hex(target->sha1));
131 copy_file(filename, sha1_pack_name(target->sha1),
132 sha1_to_hex(target->sha1), 1);
133 sprintf(filename, "%s/objects/pack/pack-%s.idx",
134 path, sha1_to_hex(target->sha1));
135 copy_file(filename, sha1_pack_index_name(target->sha1),
136 sha1_to_hex(target->sha1), 1);
137 install_packed_git(target);
138 return 0;
139 }
140
141 static int fetch_file(const unsigned char *sha1)
142 {
143 static int object_name_start = -1;
144 static char filename[PATH_MAX];
145 char *hex = sha1_to_hex(sha1);
146 char *dest_filename = sha1_file_name(sha1);
147
148 if (object_name_start < 0) {
149 strcpy(filename, path); /* e.g. git.git */
150 strcat(filename, "/objects/");
151 object_name_start = strlen(filename);
152 }
153 filename[object_name_start+0] = hex[0];
154 filename[object_name_start+1] = hex[1];
155 filename[object_name_start+2] = '/';
156 strcpy(filename + object_name_start + 3, hex + 2);
157 return copy_file(filename, dest_filename, hex, 0);
158 }
159
160 int fetch(unsigned char *sha1)
161 {
162 if (has_sha1_file(sha1))
163 return 0;
164 else
165 return fetch_file(sha1) && fetch_pack(sha1);
166 }
167
168 int fetch_ref(char *ref, unsigned char *sha1)
169 {
170 static int ref_name_start = -1;
171 static char filename[PATH_MAX];
172 static char hex[41];
173 int ifd;
174
175 if (ref_name_start < 0) {
176 sprintf(filename, "%s/refs/", path);
177 ref_name_start = strlen(filename);
178 }
179 strcpy(filename + ref_name_start, ref);
180 ifd = open(filename, O_RDONLY);
181 if (ifd < 0) {
182 close(ifd);
183 fprintf(stderr, "cannot open %s\n", filename);
184 return -1;
185 }
186 if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
187 close(ifd);
188 fprintf(stderr, "cannot read from %s\n", filename);
189 return -1;
190 }
191 close(ifd);
192 pull_say("ref %s\n", sha1_to_hex(sha1));
193 return 0;
194 }
195
196 static const char local_pull_usage[] =
197 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
198
199 /*
200 * By default we only use file copy.
201 * If -l is specified, a hard link is attempted.
202 * If -s is specified, then a symlink is attempted.
203 * If -n is _not_ specified, then a regular file-to-file copy is done.
204 */
205 int main(int argc, char **argv)
206 {
207 char *commit_id;
208 int arg = 1;
209
210 setup_git_directory();
211 git_config(git_default_config);
212
213 while (arg < argc && argv[arg][0] == '-') {
214 if (argv[arg][1] == 't')
215 get_tree = 1;
216 else if (argv[arg][1] == 'c')
217 get_history = 1;
218 else if (argv[arg][1] == 'a') {
219 get_all = 1;
220 get_tree = 1;
221 get_history = 1;
222 }
223 else if (argv[arg][1] == 'l')
224 use_link = 1;
225 else if (argv[arg][1] == 's')
226 use_symlink = 1;
227 else if (argv[arg][1] == 'n')
228 use_filecopy = 0;
229 else if (argv[arg][1] == 'v')
230 get_verbosely = 1;
231 else if (argv[arg][1] == 'w')
232 write_ref = argv[++arg];
233 else if (!strcmp(argv[arg], "--recover"))
234 get_recover = 1;
235 else
236 usage(local_pull_usage);
237 arg++;
238 }
239 if (argc < arg + 2)
240 usage(local_pull_usage);
241 commit_id = argv[arg];
242 path = argv[arg + 1];
243 write_ref_log_details = path;
244
245 if (pull(commit_id))
246 return 1;
247
248 return 0;
249 }