Merge branch 'rj/platform-pread-may-be-thread-unsafe' into maint
[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
11 static const char upload_archive_usage[] =
12         "git upload-archive <repo>";
13
14 static const char deadchild[] =
15 "git upload-archive: archiver died with error";
16
17 #define MAX_ARGS (64)
18
19 int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
20 {
21         const char *sent_argv[MAX_ARGS];
22         const char *arg_cmd = "argument ";
23         char *p, buf[4096];
24         int sent_argc;
25         int len;
26
27         if (argc != 2)
28                 usage(upload_archive_usage);
29
30         if (strlen(argv[1]) + 1 > sizeof(buf))
31                 die("insanely long repository name");
32
33         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
34
35         if (!enter_repo(buf, 0))
36                 die("'%s' does not appear to be a git repository", buf);
37
38         /* put received options in sent_argv[] */
39         sent_argc = 1;
40         sent_argv[0] = "git-upload-archive";
41         for (p = buf;;) {
42                 /* This will die if not enough free space in buf */
43                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
44                 if (len == 0)
45                         break;  /* got a flush */
46                 if (sent_argc > MAX_ARGS - 2)
47                         die("Too many options (>%d)", MAX_ARGS - 2);
48
49                 if (p[len-1] == '\n') {
50                         p[--len] = 0;
51                 }
52                 if (len < strlen(arg_cmd) ||
53                     strncmp(arg_cmd, p, strlen(arg_cmd)))
54                         die("'argument' token or flush expected");
55
56                 len -= strlen(arg_cmd);
57                 memmove(p, p + strlen(arg_cmd), len);
58                 sent_argv[sent_argc++] = p;
59                 p += len;
60                 *p++ = 0;
61         }
62         sent_argv[sent_argc] = NULL;
63
64         /* parse all options sent by the client */
65         return write_archive(sent_argc, sent_argv, prefix, 0, NULL, 1);
66 }
67
68 __attribute__((format (printf, 1, 2)))
69 static void error_clnt(const char *fmt, ...)
70 {
71         char buf[1024];
72         va_list params;
73         int len;
74
75         va_start(params, fmt);
76         len = vsprintf(buf, fmt, params);
77         va_end(params);
78         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
79         die("sent error to the client: %s", buf);
80 }
81
82 static ssize_t process_input(int child_fd, int band)
83 {
84         char buf[16384];
85         ssize_t sz = read(child_fd, buf, sizeof(buf));
86         if (sz < 0) {
87                 if (errno != EAGAIN && errno != EINTR)
88                         error_clnt("read error: %s\n", strerror(errno));
89                 return sz;
90         }
91         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
92         return sz;
93 }
94
95 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
96 {
97         struct child_process writer = { argv };
98
99         /*
100          * Set up sideband subprocess.
101          *
102          * We (parent) monitor and read from child, sending its fd#1 and fd#2
103          * multiplexed out to our fd#1.  If the child dies, we tell the other
104          * end over channel #3.
105          */
106         argv[0] = "upload-archive--writer";
107         writer.out = writer.err = -1;
108         writer.git_cmd = 1;
109         if (start_command(&writer)) {
110                 int err = errno;
111                 packet_write(1, "NACK unable to spawn subprocess\n");
112                 die("upload-archive: %s", strerror(err));
113         }
114
115         packet_write(1, "ACK\n");
116         packet_flush(1);
117
118         while (1) {
119                 struct pollfd pfd[2];
120
121                 pfd[0].fd = writer.out;
122                 pfd[0].events = POLLIN;
123                 pfd[1].fd = writer.err;
124                 pfd[1].events = POLLIN;
125                 if (poll(pfd, 2, -1) < 0) {
126                         if (errno != EINTR) {
127                                 error("poll failed resuming: %s",
128                                       strerror(errno));
129                                 sleep(1);
130                         }
131                         continue;
132                 }
133                 if (pfd[1].revents & POLLIN)
134                         /* Status stream ready */
135                         if (process_input(pfd[1].fd, 2))
136                                 continue;
137                 if (pfd[0].revents & POLLIN)
138                         /* Data stream ready */
139                         if (process_input(pfd[0].fd, 1))
140                                 continue;
141
142                 if (finish_command(&writer))
143                         error_clnt("%s", deadchild);
144                 packet_flush(1);
145                 break;
146         }
147         return 0;
148 }