fetch-pack: -k option to keep downloaded pack.
[git/git.git] / clone-pack.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4
5 static const char clone_pack_usage[] =
6 "git-clone-pack [--exec=<git-upload-pack>] [<host>:]<directory> [<heads>]*";
7 static const char *exec = "git-upload-pack";
8
9 static void clone_handshake(int fd[2], struct ref *ref)
10 {
11 unsigned char sha1[20];
12
13 while (ref) {
14 packet_write(fd[1], "want %s\n", sha1_to_hex(ref->old_sha1));
15 ref = ref->next;
16 }
17 packet_flush(fd[1]);
18
19 /* We don't have nuttin' */
20 packet_write(fd[1], "done\n");
21 if (get_ack(fd[0], sha1))
22 error("Huh! git-clone-pack got positive ack for %s", sha1_to_hex(sha1));
23 }
24
25 static int is_master(struct ref *ref)
26 {
27 return !strcmp(ref->name, "refs/heads/master");
28 }
29
30 static void write_one_ref(struct ref *ref)
31 {
32 char *path = git_path("%s", ref->name);
33 int fd;
34 char *hex;
35
36 if (!strncmp(ref->name, "refs/", 5) &&
37 check_ref_format(ref->name + 5)) {
38 error("refusing to create funny ref '%s' locally", ref->name);
39 return;
40 }
41
42 if (safe_create_leading_directories(path))
43 die("unable to create leading directory for %s", ref->name);
44 fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
45 if (fd < 0)
46 die("unable to create ref %s", ref->name);
47 hex = sha1_to_hex(ref->old_sha1);
48 hex[40] = '\n';
49 if (write(fd, hex, 41) != 41)
50 die("unable to write ref %s", ref->name);
51 close(fd);
52 }
53
54 static void write_refs(struct ref *ref)
55 {
56 struct ref *head = NULL, *head_ptr, *master_ref;
57 char *head_path;
58
59 /* Upload-pack must report HEAD first */
60 if (!strcmp(ref->name, "HEAD")) {
61 head = ref;
62 ref = ref->next;
63 }
64 head_ptr = NULL;
65 master_ref = NULL;
66 while (ref) {
67 if (is_master(ref))
68 master_ref = ref;
69 if (head &&
70 !memcmp(ref->old_sha1, head->old_sha1, 20) &&
71 !strncmp(ref->name, "refs/heads/",11) &&
72 (!head_ptr || ref == master_ref))
73 head_ptr = ref;
74
75 write_one_ref(ref);
76 ref = ref->next;
77 }
78 if (!head) {
79 fprintf(stderr, "No HEAD in remote.\n");
80 return;
81 }
82
83 head_path = strdup(git_path("HEAD"));
84 if (!head_ptr) {
85 /*
86 * If we had a master ref, and it wasn't HEAD, we need to undo the
87 * symlink, and write a standalone HEAD. Give a warning, because that's
88 * really really wrong.
89 */
90 if (master_ref) {
91 error("HEAD doesn't point to any refs! Making standalone HEAD");
92 unlink(head_path);
93 }
94 write_one_ref(head);
95 free(head_path);
96 return;
97 }
98
99 /* We reset to the master branch if it's available */
100 if (master_ref)
101 return;
102
103 fprintf(stderr, "Setting HEAD to %s\n", head_ptr->name);
104
105 /*
106 * Uhhuh. Other end didn't have master. We start HEAD off with
107 * the first branch with the same value.
108 */
109 if (create_symref(head_path, head_ptr->name) < 0)
110 die("unable to link HEAD to %s", head_ptr->name);
111 free(head_path);
112 }
113
114 static int clone_pack(int fd[2], int nr_match, char **match)
115 {
116 struct ref *refs;
117 int status;
118
119 get_remote_heads(fd[0], &refs, nr_match, match, 1);
120 if (!refs) {
121 packet_flush(fd[1]);
122 die("no matching remote head");
123 }
124 clone_handshake(fd, refs);
125
126 status = receive_keep_pack(fd, "git-clone-pack");
127
128 if (!status) {
129 if (nr_match == 0)
130 write_refs(refs);
131 else
132 while (refs) {
133 printf("%s %s\n",
134 sha1_to_hex(refs->old_sha1),
135 refs->name);
136 refs = refs->next;
137 }
138 }
139 return status;
140 }
141
142 int main(int argc, char **argv)
143 {
144 int i, ret, nr_heads;
145 char *dest = NULL, **heads;
146 int fd[2];
147 pid_t pid;
148
149 setup_git_directory();
150
151 nr_heads = 0;
152 heads = NULL;
153 for (i = 1; i < argc; i++) {
154 char *arg = argv[i];
155
156 if (*arg == '-') {
157 if (!strcmp("-q", arg))
158 continue;
159 if (!strncmp("--exec=", arg, 7)) {
160 exec = arg + 7;
161 continue;
162 }
163 if (!strcmp("--keep", arg))
164 continue;
165 usage(clone_pack_usage);
166 }
167 dest = arg;
168 heads = argv + i + 1;
169 nr_heads = argc - i - 1;
170 break;
171 }
172 if (!dest)
173 usage(clone_pack_usage);
174 pid = git_connect(fd, dest, exec);
175 if (pid < 0)
176 return 1;
177 ret = clone_pack(fd, nr_heads, heads);
178 close(fd[0]);
179 close(fd[1]);
180 finish_connect(pid);
181 return ret;
182 }