#
# git caching proxy
+# Suitable only for exposing to semi-trusted clients: clients are not
+# supposed to be able to take over the server. However, clients can
+# probably deny service to each other because the current
+# implementation is not very good at handling various out-of-course
+# situations (notably, clients which are too slow).
+
# usage: run it on some port, and then clone or fetch
# "git://<realhost>:<realport>/<real-git-url>[ <options>]"
# where <real-git-url> is http://<host>/... or git://<host>/...
# fetch=no just use what is in the cache
# fetch=try use what is in the cache if the fetch/clone fails
# timeout=<seconds> length of time to allow for fetch/clone
+# housekeeping-interval-days=<integer> } housekeeping tuning parameters
+# tree-expire-days=<integer> }
+# gc-interval-days=<integer> }
# example inetd.conf line:
# 9419 stream tcp nowait git-cache /usr/bin/git-cache-proxy git-cache-proxy
# git-cache-proxy
# Copyright 2010 Tony Finch
-# Copyright 2013 Ian Jackson
+# Copyright 2013,2014 Ian Jackson
+# Copyright 2017 Citrix
#
# git-cache-proxy is free software; you can redistribute it and/or
# modify them under the terms of the GNU General Public License as
our $debug = 0;
our $housekeepingeverydays = 1;
+our $gcintervaldays = 10;
our $treeexpiredays = 21;
-our $fetchtimeout = 1800;
-our $maxfetchtimeout = 3600;
+our $fetchtimeout = 3600;
+our $maxfetchtimeout = 7200;
+our $servetimeout = 3600;
our $cachedir = '/var/cache/git-cache-proxy';
our $housekeepingonly = 0;
exit 0;
}
+$SIG{ALRM} = sub { fail "timeout" };
+
sub gitfail ($) {
my ($msg) = @_;
close LOCK;
$cachedir = $1;
} elsif (s/^--( max-fetch-timeout
| fetch-timeout
+ | serve-timeout
| tree-expire-days
| housekeeping-interval-days
+ | gc-interval-days
)=(\d+)$//x) {
my $vn = $1;
$vn =~ y/-//d;
}
sub readcommand () {
- $SIG{ALRM} = sub { fail "timeout" };
alarm 30;
my $hex_len = xread 4;
servinfo "locking";
}
+sub update_gcstamp ($) {
+ my ($gitdir) = (@_);
+ my $gcdone = "$gitdir/cache-proxy-gc.stamp";
+ open GCSTAMP, '>', $gcdone or fail "create $gcdone: $!";
+ close GCSTAMP;
+}
+
sub clonefetch () {
lockfile \*LOCK, $lock, LOCK_EX;
if ($fetch) {
+ my $rbits = '';
+ vec($rbits,0,1) = 1;
+ my $ebits = $rbits;
+ my $r=select $rbits,undef,$ebits,0;
+ $r>=0 or fail "select recheck STDOUT failed: $!";
+ if ($r) {
+ servinfo 'client disconnected (stdin unexpectedly'.
+ (vec($rbits,0,1) ? ' readable' : '').
+ (vec($ebits,0,1) ? ' exception' : '').
+ ')';
+ exit 0;
+ }
+
our @cmd;
if (!$exists) {
servinfo "fetch/clone failed: $fetchfail";
}
}
+ alarm 0;
if (!$exists) {
+ update_gcstamp($tmpd);
rename $tmpd, $gitd or fail "rename fresh $tmpd to $gitd: $!";
$exists = 1;
}
servinfo "sharing";
lockfile \*LOCK, $lock, LOCK_SH; # NB releases and relocks
- if (chdir $gitd) {
+ if (stat $gitd) {
return 1;
}
- $!==ENOENT or fail "chdir $gitd: $!";
+ $!==ENOENT or fail "stat $gitd: $!";
# Well, err, someone must have taken the lock in between
# and garbage collected it. How annoying.
logm 'info', "housekeeping started";
foreach $lock (<[a-z]*\\.lock>) {
my $subdir = $lock; $subdir =~ s/\\.lock$//;
+ my $gcdone = "$subdir\\.git/cache-proxy-gc.stamp";
if (!lstat $lock) {
$! == ENOENT or hkfail "$lock: lstat: $!";
next;
}
+ my ($mode_what,$mode_locknb,$mode_action);
if (-M _ <= $treeexpiredays) {
- logm 'debug', "housekeeping: subdirs $subdir: touched recently";
- next;
+ if (!lstat "$gcdone") {
+ $! == ENOENT or hkfail "$gcdone: lstat: $!";
+ logm 'debug',
+ "housekeeping: subdirs $subdir: touched recently, never gc'd!";
+ } elsif (-M _ <= $gcintervaldays) {
+ logm 'debug',
+ "housekeeping: subdirs $subdir: touched recently, gc'd recently";
+ next;
+ } else {
+ logm 'debug',
+ "housekeeping: subdirs $subdir: touched recently, needs gc";
+ }
+ $mode_what = 'garbage collecting';
+ $mode_locknb = 0;
+ $mode_action = sub {
+ my $gclog = "$subdir/gc.log";
+ unlink $gclog or $!==ENOENT or hkfail "remove $gclog: $!";
+ my $child = fork // hkfail "fork (for $subdir): $!";
+ if (!$child) {
+ if (!chdir "$subdir\\.git") {
+ exit 0 if $!==ENOENT;
+ die "for gc: chdir $subdir: $!\n";
+ }
+ exec qw(git gc --quiet);
+ die "exec git gc (for $subdir): $!\n";
+ }
+ waitpid($child, 0) == $child or hkfail "waitpid failed! $!";
+ if ($?) {
+ logm 'err',
+ "housekeeping: subdirs $subdir: gc failed (wait status $?)";
+ } else {
+ update_gcstamp("$subdir\\.git");
+ logm 'debug',
+ "housekeeping: subdirs $subdir: gc done";
+ }
+ };
+ } else {
+ $mode_what = 'cleaning';
+ $mode_locknb = LOCK_NB;
+ $mode_action = sub {
+ eval {
+ foreach my $suffix (qw(tmp git)) {
+ my $dir = "${subdir}\\.$suffix";
+ my $tdir = "${subdir}\\.tmp";
+ if ($dir ne $tdir) {
+ if (!rename $dir,$tdir) {
+ next if $! == ENOENT;
+ die "$dir: cannot rename to $tdir: $!\n";
+ }
+ }
+ system qw(rm -rf --), $tdir;
+ if (stat $tdir) {
+ die "$dir: problem deleting file(s), rm exited $?\n";
+ } elsif ($! != ENOENT) {
+ die "$tdir: cannot stat after deletion: $!\n";
+ }
+ }
+ };
+ if (length $@) {
+ chomp $@;
+ logm 'warning', "housekeeping: $subdir: cleanup prevented: $@";
+ } else {
+ unlink $lock or hkfail "remove $lock: $!";
+ }
+ };
}
- if (!lockfile \*LOCK, $lock, LOCK_EX|LOCK_NB) {
+ if (!lockfile \*LOCK, $lock, LOCK_EX|$mode_locknb) {
+ die $! unless $mode_locknb;
logm 'info', "housekeeping: subdirs $subdir: lock busy, skipping";
next;
}
- logm 'info', "housekeeping: subdirs $subdir: cleaning";
- my $ok = 1;
- foreach my $suffix (qw(tmp git)) {
- my $dir = "${subdir}\\.$suffix";
- my $errs;
- remove_tree($dir, { safe=>1, error=>\$errs });
- if (stat $dir) {
- $ok = 0;
- logm 'warning', "housekeeping: $dir: problems with".
- "deletion prevent cleanup:";
- foreach my $err (@$errs) {
- logm 'info', "problem deleting: $err->[0]: $err->[1]";
- }
- }
- }
- if ($ok) {
- unlink $lock or hkfail "remove $lock: $!";
- }
+ logm 'info', "housekeeping: subdirs $subdir: $mode_what";
+ $mode_action->();
}
open HS, ">", "Housekeeping.stamp" or hkfail "touch Housekeeping.stamp: $!";
close HS or hkfail "close Housekeeping.stamp: $!";
}
if ($dofork) {
my $child = fork;
- defined $child or hkfail "fork: $!";
+ defined $child or fail "fork: $!";
if (!$child) {
+ open STDERR, "|logger -p daemon.warning -t '$us(housekeeping)'"
+ or die "fork: logger $!";
housekeeping();
exit 0;
}
sub runcommand () {
servinfo "serving";
- exec qw(git-upload-pack --strict --timeout=1000 .)
+
+ chdir $gitd or fail "chdir $gitd: $!";
+
+ exec qw(git-upload-pack --strict), "--timeout=$servetimeout", qw(.)
or fail "exec git-upload-pack: $!";
}
~ian / chiark-utils.git / blobdiff