Merge branch 'aw/cvs'
[git] / ssh-fetch.c
1 #ifndef COUNTERPART_ENV_NAME
2 #define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD"
3 #endif
4 #ifndef COUNTERPART_PROGRAM_NAME
5 #define COUNTERPART_PROGRAM_NAME "git-ssh-upload"
6 #endif
7 #ifndef MY_PROGRAM_NAME
8 #define MY_PROGRAM_NAME "git-ssh-fetch"
9 #endif
10
11 #include "cache.h"
12 #include "commit.h"
13 #include "rsh.h"
14 #include "fetch.h"
15 #include "refs.h"
16
17 static int fd_in;
18 static int fd_out;
19
20 static unsigned char remote_version;
21 static unsigned char local_version = 1;
22
23 static int prefetches;
24
25 static struct object_list *in_transit;
26 static struct object_list **end_of_transit = &in_transit;
27
28 void prefetch(unsigned char *sha1)
29 {
30         char type = 'o';
31         struct object_list *node;
32         if (prefetches > 100) {
33                 fetch(in_transit->item->sha1);
34         }
35         node = xmalloc(sizeof(struct object_list));
36         node->next = NULL;
37         node->item = lookup_unknown_object(sha1);
38         *end_of_transit = node;
39         end_of_transit = &node->next;
40         /* XXX: what if these writes fail? */
41         write_in_full(fd_out, &type, 1);
42         write_in_full(fd_out, sha1, 20);
43         prefetches++;
44 }
45
46 static char conn_buf[4096];
47 static size_t conn_buf_posn;
48
49 int fetch(unsigned char *sha1)
50 {
51         int ret;
52         signed char remote;
53         struct object_list *temp;
54
55         if (hashcmp(sha1, in_transit->item->sha1)) {
56                 /* we must have already fetched it to clean the queue */
57                 return has_sha1_file(sha1) ? 0 : -1;
58         }
59         prefetches--;
60         temp = in_transit;
61         in_transit = in_transit->next;
62         if (!in_transit)
63                 end_of_transit = &in_transit;
64         free(temp);
65
66         if (conn_buf_posn) {
67                 remote = conn_buf[0];
68                 memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
69         } else {
70                 if (xread(fd_in, &remote, 1) < 1)
71                         return -1;
72         }
73         /* fprintf(stderr, "Got %d\n", remote); */
74         if (remote < 0)
75                 return remote;
76         ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
77         if (!ret)
78                 pull_say("got %s\n", sha1_to_hex(sha1));
79         return ret;
80 }
81
82 static int get_version(void)
83 {
84         char type = 'v';
85         if (write_in_full(fd_out, &type, 1) != 1 ||
86             write_in_full(fd_out, &local_version, 1)) {
87                 return error("Couldn't request version from remote end");
88         }
89         if (xread(fd_in, &remote_version, 1) < 1) {
90                 return error("Couldn't read version from remote end");
91         }
92         return 0;
93 }
94
95 int fetch_ref(char *ref, unsigned char *sha1)
96 {
97         signed char remote;
98         char type = 'r';
99         int length = strlen(ref) + 1;
100         if (write_in_full(fd_out, &type, 1) != 1 ||
101             write_in_full(fd_out, ref, length) != length)
102                 return -1;
103
104         if (read_in_full(fd_in, &remote, 1) != 1)
105                 return -1;
106         if (remote < 0)
107                 return remote;
108         if (read_in_full(fd_in, sha1, 20) != 20)
109                 return -1;
110         return 0;
111 }
112
113 static const char ssh_fetch_usage[] =
114   MY_PROGRAM_NAME
115   " [-c] [-t] [-a] [-v] [--recover] [-w ref] commit-id url";
116 int main(int argc, char **argv)
117 {
118         const char *write_ref = NULL;
119         char *commit_id;
120         char *url;
121         int arg = 1;
122         const char *prog;
123
124         prog = getenv("GIT_SSH_PUSH");
125         if (!prog) prog = "git-ssh-upload";
126
127         setup_git_directory();
128         git_config(git_default_config);
129
130         while (arg < argc && argv[arg][0] == '-') {
131                 if (argv[arg][1] == 't') {
132                         get_tree = 1;
133                 } else if (argv[arg][1] == 'c') {
134                         get_history = 1;
135                 } else if (argv[arg][1] == 'a') {
136                         get_all = 1;
137                         get_tree = 1;
138                         get_history = 1;
139                 } else if (argv[arg][1] == 'v') {
140                         get_verbosely = 1;
141                 } else if (argv[arg][1] == 'w') {
142                         write_ref = argv[arg + 1];
143                         arg++;
144                 } else if (!strcmp(argv[arg], "--recover")) {
145                         get_recover = 1;
146                 }
147                 arg++;
148         }
149         if (argc < arg + 2) {
150                 usage(ssh_fetch_usage);
151                 return 1;
152         }
153         commit_id = argv[arg];
154         url = argv[arg + 1];
155
156         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
157                 return 1;
158
159         if (get_version())
160                 return 1;
161
162         if (pull(1, &commit_id, &write_ref, url))
163                 return 1;
164
165         return 0;
166 }