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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, 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 | ||
136 | while (arg < argc && argv[arg][0] == '-') { | |
137 | if (argv[arg][1] == 't') { | |
138 | get_tree = 1; | |
139 | } else if (argv[arg][1] == 'c') { | |
140 | get_history = 1; | |
141 | } else if (argv[arg][1] == 'a') { | |
142 | get_all = 1; | |
143 | get_tree = 1; | |
144 | get_history = 1; | |
145 | } else if (argv[arg][1] == 'v') { | |
146 | get_verbosely = 1; | |
147 | } else if (argv[arg][1] == 'w') { | |
148 | write_ref = argv[arg + 1]; | |
149 | arg++; | |
150 | } else if (!strcmp(argv[arg], "--recover")) { | |
151 | get_recover = 1; | |
152 | } | |
153 | arg++; | |
154 | } | |
155 | if (argc < arg + 2) { | |
156 | usage(ssh_fetch_usage); | |
157 | return 1; | |
158 | } | |
159 | commit_id = argv[arg]; | |
160 | url = argv[arg + 1]; | |
161 | ||
162 | if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1)) | |
163 | return 1; | |
164 | ||
165 | if (get_version()) | |
166 | return 1; | |
167 | ||
168 | if (pull(commit_id)) | |
169 | return 1; | |
170 | ||
171 | return 0; | |
172 | } |