Code

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