diff: do not use null sha1 as a sentinel value
[git/git.git] / builtin / upload-archive.c
CommitLineData
39345a21
FBH
1/*
2 * Copyright (c) 2006 Franck Bui-Huu
3 */
39345a21
FBH
4#include "cache.h"
5#include "builtin.h"
6#include "archive.h"
7#include "pkt-line.h"
23d6d112 8#include "sideband.h"
1bc01efe 9#include "run-command.h"
39345a21
FBH
10
11static const char upload_archive_usage[] =
1b1dd23f 12 "git upload-archive <repo>";
39345a21 13
23d6d112 14static const char deadchild[] =
1b1dd23f 15"git upload-archive: archiver died with error";
39345a21 16
7f4d0511 17#define MAX_ARGS (64)
23d6d112 18
1bc01efe 19int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
39345a21 20{
f0c7fd49 21 const char *sent_argv[MAX_ARGS];
39345a21
FBH
22 const char *arg_cmd = "argument ";
23 char *p, buf[4096];
39345a21
FBH
24 int sent_argc;
25 int len;
26
f0c7fd49
JH
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
39345a21 38 /* put received options in sent_argv[] */
f0c7fd49
JH
39 sent_argc = 1;
40 sent_argv[0] = "git-upload-archive";
39345a21
FBH
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)
7f4d0511 47 die("Too many options (>%d)", MAX_ARGS - 2);
39345a21
FBH
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;
f0c7fd49
JH
63
64 /* parse all options sent by the client */
65 return write_archive(sent_argc, sent_argv, prefix, 0, NULL, 1);
23d6d112
JH
66}
67
28bea9e5 68__attribute__((format (printf, 1, 2)))
d3788e19
JH
69static 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
1b19fa46 82static ssize_t process_input(int child_fd, int band)
d3788e19
JH
83{
84 char buf[16384];
85 ssize_t sz = read(child_fd, buf, sizeof(buf));
86 if (sz < 0) {
93d26e4c 87 if (errno != EAGAIN && errno != EINTR)
d3788e19 88 error_clnt("read error: %s\n", strerror(errno));
1b19fa46 89 return sz;
d3788e19
JH
90 }
91 send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
1b19fa46 92 return sz;
d3788e19
JH
93}
94
23d6d112
JH
95int cmd_upload_archive(int argc, const char **argv, const char *prefix)
96{
1bc01efe
JK
97 struct child_process writer = { argv };
98
f0c7fd49
JH
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 */
1bc01efe
JK
106 argv[0] = "upload-archive--writer";
107 writer.out = writer.err = -1;
108 writer.git_cmd = 1;
109 if (start_command(&writer)) {
23d6d112 110 int err = errno;
1bc01efe 111 packet_write(1, "NACK unable to spawn subprocess\n");
23d6d112
JH
112 die("upload-archive: %s", strerror(err));
113 }
23d6d112 114
39345a21
FBH
115 packet_write(1, "ACK\n");
116 packet_flush(1);
117
23d6d112
JH
118 while (1) {
119 struct pollfd pfd[2];
23d6d112 120
1bc01efe 121 pfd[0].fd = writer.out;
23d6d112 122 pfd[0].events = POLLIN;
1bc01efe 123 pfd[1].fd = writer.err;
23d6d112
JH
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 }
d3788e19 133 if (pfd[1].revents & POLLIN)
23d6d112 134 /* Status stream ready */
6b59f51b
NP
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;
d3788e19 141
1bc01efe 142 if (finish_command(&writer))
d3788e19 143 error_clnt("%s", deadchild);
23d6d112
JH
144 packet_flush(1);
145 break;
146 }
147 return 0;
148}