Merge branch 'jc/show-merge'
[git/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
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 = 0;
21 static unsigned char local_version = 1;
22
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 }
38
39 static int prefetches = 0;
40
41 static struct object_list *in_transit = NULL;
42 static struct object_list **end_of_transit = &in_transit;
43
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 }
60
61 static char conn_buf[4096];
62 static size_t conn_buf_posn = 0;
63
64 int fetch(unsigned char *sha1)
65 {
66 int ret;
67 signed char remote;
68 struct object_list *temp;
69
70 if (memcmp(sha1, in_transit->item->sha1, 20)) {
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);
80
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 }
96
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;
106 }
107
108 int fetch_ref(char *ref, unsigned char *sha1)
109 {
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;
119 }
120
121 static const char ssh_fetch_usage[] =
122 MY_PROGRAM_NAME
123 " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
124 int main(int argc, char **argv)
125 {
126 char *commit_id;
127 char *url;
128 int arg = 1;
129 const char *prog;
130
131 prog = getenv("GIT_SSH_PUSH");
132 if (!prog) prog = "git-ssh-upload";
133
134 setup_git_directory();
135 git_config(git_default_config);
136
137 while (arg < argc && argv[arg][0] == '-') {
138 if (argv[arg][1] == 't') {
139 get_tree = 1;
140 } else if (argv[arg][1] == 'c') {
141 get_history = 1;
142 } else if (argv[arg][1] == 'a') {
143 get_all = 1;
144 get_tree = 1;
145 get_history = 1;
146 } else if (argv[arg][1] == 'v') {
147 get_verbosely = 1;
148 } else if (argv[arg][1] == 'w') {
149 write_ref = argv[arg + 1];
150 arg++;
151 } else if (!strcmp(argv[arg], "--recover")) {
152 get_recover = 1;
153 }
154 arg++;
155 }
156 if (argc < arg + 2) {
157 usage(ssh_fetch_usage);
158 return 1;
159 }
160 commit_id = argv[arg];
161 url = argv[arg + 1];
162 write_ref_log_details = url;
163
164 if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
165 return 1;
166
167 if (get_version())
168 return 1;
169
170 if (pull(commit_id))
171 return 1;
172
173 return 0;
174 }