upload-archive: convert sprintf to strbuf
[git/git.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)
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, 0, NULL, 1);
47 }
48
49 __attribute__((format (printf, 1, 2)))
50 static void error_clnt(const char *fmt, ...)
51 {
52 struct strbuf buf = STRBUF_INIT;
53 va_list params;
54
55 va_start(params, fmt);
56 strbuf_vaddf(&buf, fmt, params);
57 va_end(params);
58 send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
59 die("sent error to the client: %s", buf.buf);
60 }
61
62 static ssize_t process_input(int child_fd, int band)
63 {
64 char buf[16384];
65 ssize_t sz = read(child_fd, buf, sizeof(buf));
66 if (sz < 0) {
67 if (errno != EAGAIN && errno != EINTR)
68 error_clnt("read error: %s\n", strerror(errno));
69 return sz;
70 }
71 send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
72 return sz;
73 }
74
75 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
76 {
77 struct child_process writer = { argv };
78
79 /*
80 * Set up sideband subprocess.
81 *
82 * We (parent) monitor and read from child, sending its fd#1 and fd#2
83 * multiplexed out to our fd#1. If the child dies, we tell the other
84 * end over channel #3.
85 */
86 argv[0] = "upload-archive--writer";
87 writer.out = writer.err = -1;
88 writer.git_cmd = 1;
89 if (start_command(&writer)) {
90 int err = errno;
91 packet_write(1, "NACK unable to spawn subprocess\n");
92 die("upload-archive: %s", strerror(err));
93 }
94
95 packet_write(1, "ACK\n");
96 packet_flush(1);
97
98 while (1) {
99 struct pollfd pfd[2];
100
101 pfd[0].fd = writer.out;
102 pfd[0].events = POLLIN;
103 pfd[1].fd = writer.err;
104 pfd[1].events = POLLIN;
105 if (poll(pfd, 2, -1) < 0) {
106 if (errno != EINTR) {
107 error("poll failed resuming: %s",
108 strerror(errno));
109 sleep(1);
110 }
111 continue;
112 }
113 if (pfd[1].revents & POLLIN)
114 /* Status stream ready */
115 if (process_input(pfd[1].fd, 2))
116 continue;
117 if (pfd[0].revents & POLLIN)
118 /* Data stream ready */
119 if (process_input(pfd[0].fd, 1))
120 continue;
121
122 if (finish_command(&writer))
123 error_clnt("%s", deadchild);
124 packet_flush(1);
125 break;
126 }
127 return 0;
128 }