Merge branch 'jc/date' into next
[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
212         while (arg < argc && argv[arg][0] == '-') {
213                 if (argv[arg][1] == 't')
214                         get_tree = 1;
215                 else if (argv[arg][1] == 'c')
216                         get_history = 1;
217                 else if (argv[arg][1] == 'a') {
218                         get_all = 1;
219                         get_tree = 1;
220                         get_history = 1;
221                 }
222                 else if (argv[arg][1] == 'l')
223                         use_link = 1;
224                 else if (argv[arg][1] == 's')
225                         use_symlink = 1;
226                 else if (argv[arg][1] == 'n')
227                         use_filecopy = 0;
228                 else if (argv[arg][1] == 'v')
229                         get_verbosely = 1;
230                 else if (argv[arg][1] == 'w')
231                         write_ref = argv[++arg];
232                 else if (!strcmp(argv[arg], "--recover"))
233                         get_recover = 1;
234                 else
235                         usage(local_pull_usage);
236                 arg++;
237         }
238         if (argc < arg + 2)
239                 usage(local_pull_usage);
240         commit_id = argv[arg];
241         path = argv[arg + 1];
242
243         if (pull(commit_id))
244                 return 1;
245
246         return 0;
247 }