Merge branch 'jn/gc-auto'
[git] / builtin / upload-archive.c
1 /*
2  * Copyright (c) 2006 Franck Bui-Huu
3  */
4 #include "cache.h"
5 #include "builtin.h"
6 #include "archive.h"
7 #include "pkt-line.h"
8 #include "sideband.h"
9 #include "run-command.h"
10 #include "argv-array.h"
11
12 static const char upload_archive_usage[] =
13         "git upload-archive <repo>";
14
15 static const char deadchild[] =
16 "git upload-archive: archiver died with error";
17
18 #define MAX_ARGS (64)
19
20 int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
21 {
22         struct argv_array sent_argv = ARGV_ARRAY_INIT;
23         const char *arg_cmd = "argument ";
24
25         if (argc != 2 || !strcmp(argv[1], "-h"))
26                 usage(upload_archive_usage);
27
28         if (!enter_repo(argv[1], 0))
29                 die("'%s' does not appear to be a git repository", argv[1]);
30
31         /* put received options in sent_argv[] */
32         argv_array_push(&sent_argv, "git-upload-archive");
33         for (;;) {
34                 char *buf = packet_read_line(0, NULL);
35                 if (!buf)
36                         break;  /* got a flush */
37                 if (sent_argv.argc > MAX_ARGS)
38                         die("Too many options (>%d)", MAX_ARGS - 1);
39
40                 if (!starts_with(buf, arg_cmd))
41                         die("'argument' token or flush expected");
42                 argv_array_push(&sent_argv, buf + strlen(arg_cmd));
43         }
44
45         /* parse all options sent by the client */
46         return write_archive(sent_argv.argc, sent_argv.argv, prefix,
47                              the_repository, NULL, 1);
48 }
49
50 __attribute__((format (printf, 1, 2)))
51 static void error_clnt(const char *fmt, ...)
52 {
53         struct strbuf buf = STRBUF_INIT;
54         va_list params;
55
56         va_start(params, fmt);
57         strbuf_vaddf(&buf, fmt, params);
58         va_end(params);
59         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
60         die("sent error to the client: %s", buf.buf);
61 }
62
63 static ssize_t process_input(int child_fd, int band)
64 {
65         char buf[16384];
66         ssize_t sz = read(child_fd, buf, sizeof(buf));
67         if (sz < 0) {
68                 if (errno != EAGAIN && errno != EINTR)
69                         error_clnt("read error: %s\n", strerror(errno));
70                 return sz;
71         }
72         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
73         return sz;
74 }
75
76 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
77 {
78         struct child_process writer = { argv };
79
80         if (argc == 2 && !strcmp(argv[1], "-h"))
81                 usage(upload_archive_usage);
82
83         /*
84          * Set up sideband subprocess.
85          *
86          * We (parent) monitor and read from child, sending its fd#1 and fd#2
87          * multiplexed out to our fd#1.  If the child dies, we tell the other
88          * end over channel #3.
89          */
90         argv[0] = "upload-archive--writer";
91         writer.out = writer.err = -1;
92         writer.git_cmd = 1;
93         if (start_command(&writer)) {
94                 int err = errno;
95                 packet_write_fmt(1, "NACK unable to spawn subprocess\n");
96                 die("upload-archive: %s", strerror(err));
97         }
98
99         packet_write_fmt(1, "ACK\n");
100         packet_flush(1);
101
102         while (1) {
103                 struct pollfd pfd[2];
104
105                 pfd[0].fd = writer.out;
106                 pfd[0].events = POLLIN;
107                 pfd[1].fd = writer.err;
108                 pfd[1].events = POLLIN;
109                 if (poll(pfd, 2, -1) < 0) {
110                         if (errno != EINTR) {
111                                 error_errno("poll failed resuming");
112                                 sleep(1);
113                         }
114                         continue;
115                 }
116                 if (pfd[1].revents & POLLIN)
117                         /* Status stream ready */
118                         if (process_input(pfd[1].fd, 2))
119                                 continue;
120                 if (pfd[0].revents & POLLIN)
121                         /* Data stream ready */
122                         if (process_input(pfd[0].fd, 1))
123                                 continue;
124
125                 if (finish_command(&writer))
126                         error_clnt("%s", deadchild);
127                 packet_flush(1);
128                 break;
129         }
130         return 0;
131 }