Make "index_name_exists()" return the cache_entry it found
[git/dscho.git] / builtin-upload-archive.c
blob48ae09e9b5268ce1f11cfba433680a147ca39f7e
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"
10 static const char upload_archive_usage[] =
11 "git-upload-archive <repo>";
13 static const char deadchild[] =
14 "git-upload-archive: archiver died with error";
16 static const char lostchild[] =
17 "git-upload-archive: archiver process was lost";
20 static int run_upload_archive(int argc, const char **argv, const char *prefix)
22 struct archiver ar;
23 const char *sent_argv[MAX_ARGS];
24 const char *arg_cmd = "argument ";
25 char *p, buf[4096];
26 int treeish_idx;
27 int sent_argc;
28 int len;
30 if (argc != 2)
31 usage(upload_archive_usage);
33 if (strlen(argv[1]) > sizeof(buf))
34 die("insanely long repository name");
36 strcpy(buf, argv[1]); /* enter-repo smudges its argument */
38 if (!enter_repo(buf, 0))
39 die("not a git archive");
41 /* put received options in sent_argv[] */
42 sent_argc = 1;
43 sent_argv[0] = "git-upload-archive";
44 for (p = buf;;) {
45 /* This will die if not enough free space in buf */
46 len = packet_read_line(0, p, (buf + sizeof buf) - p);
47 if (len == 0)
48 break; /* got a flush */
49 if (sent_argc > MAX_ARGS - 2)
50 die("Too many options (>29)");
52 if (p[len-1] == '\n') {
53 p[--len] = 0;
55 if (len < strlen(arg_cmd) ||
56 strncmp(arg_cmd, p, strlen(arg_cmd)))
57 die("'argument' token or flush expected");
59 len -= strlen(arg_cmd);
60 memmove(p, p + strlen(arg_cmd), len);
61 sent_argv[sent_argc++] = p;
62 p += len;
63 *p++ = 0;
65 sent_argv[sent_argc] = NULL;
67 /* parse all options sent by the client */
68 treeish_idx = parse_archive_args(sent_argc, sent_argv, &ar);
70 parse_treeish_arg(sent_argv + treeish_idx, &ar.args, prefix);
71 parse_pathspec_arg(sent_argv + treeish_idx + 1, &ar.args);
73 return ar.write_archive(&ar.args);
76 static void error_clnt(const char *fmt, ...)
78 char buf[1024];
79 va_list params;
80 int len;
82 va_start(params, fmt);
83 len = vsprintf(buf, fmt, params);
84 va_end(params);
85 send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
86 die("sent error to the client: %s", buf);
89 static void process_input(int child_fd, int band)
91 char buf[16384];
92 ssize_t sz = read(child_fd, buf, sizeof(buf));
93 if (sz < 0) {
94 if (errno != EAGAIN && errno != EINTR)
95 error_clnt("read error: %s\n", strerror(errno));
96 return;
98 send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
101 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
103 pid_t writer;
104 int fd1[2], fd2[2];
106 * Set up sideband subprocess.
108 * We (parent) monitor and read from child, sending its fd#1 and fd#2
109 * multiplexed out to our fd#1. If the child dies, we tell the other
110 * end over channel #3.
112 if (pipe(fd1) < 0 || pipe(fd2) < 0) {
113 int err = errno;
114 packet_write(1, "NACK pipe failed on the remote side\n");
115 die("upload-archive: %s", strerror(err));
117 writer = fork();
118 if (writer < 0) {
119 int err = errno;
120 packet_write(1, "NACK fork failed on the remote side\n");
121 die("upload-archive: %s", strerror(err));
123 if (!writer) {
124 /* child - connect fd#1 and fd#2 to the pipe */
125 dup2(fd1[1], 1);
126 dup2(fd2[1], 2);
127 close(fd1[1]); close(fd2[1]);
128 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
130 exit(run_upload_archive(argc, argv, prefix));
133 /* parent - read from child, multiplex and send out to fd#1 */
134 close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
135 packet_write(1, "ACK\n");
136 packet_flush(1);
138 while (1) {
139 struct pollfd pfd[2];
140 int status;
142 pfd[0].fd = fd1[0];
143 pfd[0].events = POLLIN;
144 pfd[1].fd = fd2[0];
145 pfd[1].events = POLLIN;
146 if (poll(pfd, 2, -1) < 0) {
147 if (errno != EINTR) {
148 error("poll failed resuming: %s",
149 strerror(errno));
150 sleep(1);
152 continue;
154 if (pfd[0].revents & POLLIN)
155 /* Data stream ready */
156 process_input(pfd[0].fd, 1);
157 if (pfd[1].revents & POLLIN)
158 /* Status stream ready */
159 process_input(pfd[1].fd, 2);
160 /* Always finish to read data when available */
161 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
162 continue;
164 if (waitpid(writer, &status, 0) < 0)
165 error_clnt("%s", lostchild);
166 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
167 error_clnt("%s", deadchild);
168 packet_flush(1);
169 break;
171 return 0;