[PATCH] fetch.c: Remove redundant TO_FETCH flag
[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         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 }
51
52 static 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 }
99
100 static 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 }
127
128 static 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
135         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 }
146
147 int fetch(unsigned char *sha1)
148 {
149         return fetch_file(sha1) && fetch_pack(sha1);
150 }
151
152 int 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
159         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 }
179
180 static const char local_pull_usage[] =
181 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
182
183 /* 
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  */
189 int main(int argc, char **argv)
190 {
191         char *commit_id;
192         int arg = 1;
193
194         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
223         if (pull(commit_id))
224                 return 1;
225
226         return 0;
227 }