5 # usage: run it on some port, and then clone or fetch
6 # git://<realhost>:<realport>/<real-git-url>
7 # where <real-git-url> is http://<host>/... or git://<host>/...
16 our $us = 'git-cache-proxy';
17 our $log; # filehandle (ref), or "1" meaning syslog
18 our $fetchtimeout = 1800;
19 our $maxfetchtimeout = 3600;
23 return ('(local)') unless defined $sockaddr;
24 my ($port,$addr) = sockaddr_in $sockaddr;
25 $addr = inet_ntoa $addr;
26 return ("[$addr]:$port",$addr,$port);
29 our ($client,$client_addr,$client_port) = ntoa getpeername STDIN;
30 our ($server,$server_addr,$server_port) = ntoa getsockname STDIN;
34 openlog $us, qw(pid), 'daemon';
41 my $mainmsg = sprintf "%s-%s: %s", $server, $client, $msg;
43 my $wholemsg = sprintf("%s [%d] %s: %s\n",
44 strftime("%Y-%m-%d %H:%M:%S Z", gmtime),
50 syslog $pri, $mainmsg;
63 my $gitmsg = "ERR $us: $msg";
64 $gitmsg = substr($gitmsg,0,65535); # just in case
65 printf "%04x%s", length($gitmsg)+4, $gitmsg;
70 our $cachedir = '/var/cache/git-cache-proxy';
74 last unless $ARGV[0] =~ m/^-/;
80 open STDERR, ">>", $logfile or fail "open $logfile: $!";
82 } elsif (s/^-d(.*)$//) {
84 } elsif (s/^--(maxfetchtimeout|fetchtimeout)=(\d+)$//) {
87 fail "bad usage: unknown option `$_'";
92 !@ARGV or fail "bad usage: no non-option arguments permitted";
94 chdir $cachedir or fail "chdir $cachedir: $!";
96 our ($service,$specpath,$spechost);
98 $SIG{ALRM} = sub { fail "timeout" };
104 while ($length > length $buffer) {
105 my $ret = sysread STDIN, $buffer, $length, length $buffer;
106 fail "Expected $length bytes, got ".length $buffer
107 if defined $ret and $ret == 0;
108 fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN;
112 my $hex_len = xread 4;
113 fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
114 my $line = xread -4 + hex $hex_len;
115 unless (($service,$specpath,$spechost) = $line =~
116 m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
117 $line =~ s|[^ -~]+| |g;
118 fail "Could not parse \"$line\""
123 $service eq 'git-upload-pack'
124 or gitfail "unknown/unsupported service `$service'";
126 my $fetch = 2; # 0:don't; 1:try; 2:force
129 while ($url =~ s#^(\[)([^][{}])+\]## ||
130 $url =~ s#^(\{)([^][{}])+\}##) {
132 my $must = $1 eq '{';
135 } elsif (m/^nofetch$/) {
137 } elsif (m/^timeout=(\d+)$/) {
138 $fetchtimeout = $1 <= $maxfetchtimeout ? $1 : $maxfetchtimeout;
140 gitfail "unknown/unsupported option `$_'";
144 $url =~ m{^(?:https?|git)://[-.0-9a-z]+/}
145 or gitfail "unknown/unsupported url scheme or format `$url'";
148 $subdir =~ s|\\|\\\\|g;
149 $subdir =~ s|,|\\,|g;
152 log 'info', "$specpath locking";
154 my $tmpd= "$subdir\\.tmp";
155 my $gitd= "$subdir\\.git";
156 my $lock = "$subdir\\.lock";
158 open LOCK, "+>", $lock or fail "open/create $lock: $!";
159 flock LOCK, LOCK_EX or fail "lock $lock: $!";
161 $exists = stat $gitd;
162 $exists or $!==ENOENT or FAIL "stat $gitd: $!";
169 system qw(rm -rf --), $tmpd;
170 @cmd = qw(git clone -q --mirror), $url;
171 log 'info', "$specpath cloning";
173 @cmd = qw(git remote update --prune), $url;
174 log 'info', "$specpath fetching";
177 my $child = open P, "-|";
178 defined $child or fail "fork: $!";
181 chdir $gitd or fail "chdir $gitd: $!";
183 setpgrp or fail "setpgrp: $!";
184 open STDERR, ">&STDOUT" or fail "redirect stderr: $!";
185 exec @cmd or fail "exec $cmd[0]: $!";
188 local $SIG{ALARM} = sub {
194 alarm($fetchtimeout);
197 printf STDERR "%s [$$] %s %s\n",
198 strftime("%Y-%m-%d %H:%M:%S %Z", localtime), $server, $client;
208 fail "No global mapping for $uri" unless defined $serve_user;
210 my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $spechost;
211 fail "hostname/address mismatch ($spechost $server_addr)" unless grep {
212 $server_addr eq inet_ntoa $_
217 push @opts, "-D$_=${$::{$_}}"
218 for qw(service specpath spechost
219 client client_addr client_port
220 server server_addr server_port);
222 fail "no user $serve_user" unless getpwnam($serve_user);
224 syslog 'notice', "$client $service $uri $serve_user";
226 my @cmd = ('userv', '-t300', @opts, $serve_user, $service);
227 no warnings; # suppress errors to stderr
228 exec @cmd or fail "exec userv: $!";