diff: do not use null sha1 as a sentinel value
[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
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 }