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Commit | Line | Data |
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1fcc8ea5 LT |
1 | #include "cache.h" |
2 | #include "refs.h" | |
3 | #include "pkt-line.h" | |
4 | #include <sys/wait.h> | |
5 | ||
167a4a33 | 6 | static int quiet; |
6ec311da | 7 | static const char clone_pack_usage[] = "git-clone-pack [-q] [--exec=<git-upload-pack>] [<host>:]<directory> [<heads>]*"; |
1fcc8ea5 LT |
8 | static const char *exec = "git-upload-pack"; |
9 | ||
1fcc8ea5 LT |
10 | static void clone_handshake(int fd[2], struct ref *ref) |
11 | { | |
12 | unsigned char sha1[20]; | |
13 | ||
14 | while (ref) { | |
d1c133f5 | 15 | packet_write(fd[1], "want %s\n", sha1_to_hex(ref->old_sha1)); |
1fcc8ea5 LT |
16 | ref = ref->next; |
17 | } | |
18 | packet_flush(fd[1]); | |
19 | ||
20 | /* We don't have nuttin' */ | |
21 | packet_write(fd[1], "done\n"); | |
22 | if (get_ack(fd[0], sha1)) | |
23 | error("Huh! git-clone-pack got positive ack for %s", sha1_to_hex(sha1)); | |
24 | } | |
25 | ||
26 | static int is_master(struct ref *ref) | |
27 | { | |
28 | return !strcmp(ref->name, "refs/heads/master"); | |
29 | } | |
30 | ||
31 | static void write_one_ref(struct ref *ref) | |
32 | { | |
4ec99bf0 | 33 | char *path = git_path("%s", ref->name); |
b2cb9425 | 34 | int fd; |
1fcc8ea5 LT |
35 | char *hex; |
36 | ||
b2cb9425 JH |
37 | if (safe_create_leading_directories(path)) |
38 | die("unable to create leading directory for %s", ref->name); | |
39 | fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1fcc8ea5 LT |
40 | if (fd < 0) |
41 | die("unable to create ref %s", ref->name); | |
d1c133f5 | 42 | hex = sha1_to_hex(ref->old_sha1); |
1fcc8ea5 LT |
43 | hex[40] = '\n'; |
44 | if (write(fd, hex, 41) != 41) | |
45 | die("unable to write ref %s", ref->name); | |
46 | close(fd); | |
47 | } | |
48 | ||
49 | static void write_refs(struct ref *ref) | |
50 | { | |
51 | struct ref *head = NULL, *head_ptr, *master_ref; | |
52 | char *head_path; | |
53 | ||
54 | if (!strcmp(ref->name, "HEAD")) { | |
55 | head = ref; | |
56 | ref = ref->next; | |
57 | } | |
58 | head_ptr = NULL; | |
59 | master_ref = NULL; | |
60 | while (ref) { | |
61 | if (is_master(ref)) | |
62 | master_ref = ref; | |
d1c133f5 | 63 | if (head && !memcmp(ref->old_sha1, head->old_sha1, 20)) { |
1fcc8ea5 LT |
64 | if (!head_ptr || ref == master_ref) |
65 | head_ptr = ref; | |
66 | } | |
67 | write_one_ref(ref); | |
68 | ref = ref->next; | |
69 | } | |
70 | if (!head) | |
71 | return; | |
72 | ||
73 | head_path = git_path("HEAD"); | |
74 | if (!head_ptr) { | |
75 | /* | |
76 | * If we had a master ref, and it wasn't HEAD, we need to undo the | |
77 | * symlink, and write a standalone HEAD. Give a warning, because that's | |
78 | * really really wrong. | |
79 | */ | |
80 | if (master_ref) { | |
81 | error("HEAD doesn't point to any refs! Making standalone HEAD"); | |
82 | unlink(head_path); | |
83 | } | |
84 | write_one_ref(head); | |
85 | return; | |
86 | } | |
87 | ||
88 | /* We reset to the master branch if it's available */ | |
89 | if (master_ref) | |
90 | return; | |
91 | ||
92 | /* | |
93 | * Uhhuh. Other end didn't have master. We start HEAD off with | |
94 | * the first branch with the same value. | |
95 | */ | |
96 | unlink(head_path); | |
97 | if (symlink(head_ptr->name, head_path) < 0) | |
98 | die("unable to link HEAD to %s", head_ptr->name); | |
99 | } | |
100 | ||
101 | static int clone_pack(int fd[2], int nr_match, char **match) | |
102 | { | |
103 | struct ref *refs; | |
104 | int status; | |
105 | pid_t pid; | |
106 | ||
d1c133f5 | 107 | get_remote_heads(fd[0], &refs, nr_match, match); |
1fcc8ea5 LT |
108 | if (!refs) { |
109 | packet_flush(fd[1]); | |
110 | die("no matching remote head"); | |
111 | } | |
112 | clone_handshake(fd, refs); | |
113 | pid = fork(); | |
114 | if (pid < 0) | |
115 | die("git-clone-pack: unable to fork off git-unpack-objects"); | |
116 | if (!pid) { | |
1fcc8ea5 LT |
117 | dup2(fd[0], 0); |
118 | close(fd[0]); | |
5ccdf4ce | 119 | close(fd[1]); |
167a4a33 LT |
120 | execlp("git-unpack-objects", "git-unpack-objects", |
121 | quiet ? "-q" : NULL, NULL); | |
1fcc8ea5 LT |
122 | die("git-unpack-objects exec failed"); |
123 | } | |
124 | close(fd[0]); | |
125 | close(fd[1]); | |
126 | while (waitpid(pid, &status, 0) < 0) { | |
127 | if (errno != EINTR) | |
128 | die("waiting for git-unpack-objects: %s", strerror(errno)); | |
129 | } | |
130 | if (WIFEXITED(status)) { | |
131 | int code = WEXITSTATUS(status); | |
132 | if (code) | |
133 | die("git-unpack-objects died with error code %d", code); | |
134 | write_refs(refs); | |
135 | return 0; | |
136 | } | |
137 | if (WIFSIGNALED(status)) { | |
138 | int sig = WTERMSIG(status); | |
139 | die("git-unpack-objects died of signal %d", sig); | |
140 | } | |
141 | die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status); | |
142 | } | |
143 | ||
144 | int main(int argc, char **argv) | |
145 | { | |
146 | int i, ret, nr_heads; | |
147 | char *dest = NULL, **heads; | |
148 | int fd[2]; | |
149 | pid_t pid; | |
150 | ||
151 | nr_heads = 0; | |
152 | heads = NULL; | |
153 | for (i = 1; i < argc; i++) { | |
154 | char *arg = argv[i]; | |
155 | ||
156 | if (*arg == '-') { | |
167a4a33 LT |
157 | if (!strcmp("-q", arg)) { |
158 | quiet = 1; | |
159 | continue; | |
160 | } | |
6ec311da JH |
161 | if (!strncmp("--exec=", arg, 7)) { |
162 | exec = arg + 7; | |
163 | continue; | |
164 | } | |
1fcc8ea5 LT |
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 | } |