# 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
our $debug = 0;
our $housekeepingeverydays = 1;
+our $gcintervaldays = 10;
our $treeexpiredays = 21;
-our $fetchtimeout = 1800;
-our $maxfetchtimeout = 3600;
-our $servetimeout = 1000;
+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;
| serve-timeout
| tree-expire-days
| housekeeping-interval-days
+ | gc-interval-days
)=(\d+)$//x) {
my $vn = $1;
$vn =~ y/-//d;
#---------- utility functions ----------
-sub lockfile ($$$) {
- my ($fh, $fn, $flockmode) = @_;
+sub lockfile ($$$$) {
+ my ($fh, $fn, $flockmode, $update_ts) = @_;
my $what = $fn.(($flockmode & ~LOCK_NB) == LOCK_SH ? " (shared)" : "");
for (;;) {
close $fh;
- open $fh, '+>', $fn or fail "open/create $fn for lock: $!";
+ open $fh, ($update_ts ? '+>' : '+>>'), $fn
+ or fail "open/create $fn for lock: $!";
logm 'debug', "lock $what: acquiring";
if (!flock $fh, $flockmode) {
if ($flockmode & LOCK_NB && $! == EWOULDBLOCK) {
}
sub readcommand () {
- $SIG{ALRM} = sub { fail "timeout" };
alarm 30;
my $hex_len = xread 4;
fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
my $line = xread -4 + hex $hex_len;
unless (($service,$specpath,$spechost) = $line =~
- m|^(git-[a-z-]+) /*([!-~ ]+)\0host=([!-~]+)\0$|) {
+ m|^(git-[a-z-]+) /*([!-~ ]+)\0host=([!-~]+)\0|) {
$line =~ s|[^ -~]+| |g;
gitfail "unknown/unsupported instruction `$line'"
}
servinfo "locking";
}
+sub update_gcstamp ($) {
+ my ($gitdir) = (@_);
+ my $gcdone = "$gitdir/cache-proxy-gc.stamp";
+ if (open GCSTAMP, '>', $gcdone) {
+ close GCSTAMP;
+ } else {
+ $!==ENOENT or fail "create $gcdone: $!";
+ }
+}
+
sub clonefetch () {
- lockfile \*LOCK, $lock, LOCK_EX;
+ lockfile \*LOCK, $lock, LOCK_EX, 1;
my $exists = lstat $gitd;
$exists or $!==ENOENT or fail "lstat $gitd: $!";
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) {
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
+ lockfile \*LOCK, $lock, LOCK_SH, 1; # NB releases and relocks
if (stat $gitd) {
return 1;
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 (!lockfile \*LOCK, $lock, LOCK_EX|LOCK_NB) {
- logm 'info', "housekeeping: subdirs $subdir: lock busy, skipping";
- next;
- }
- logm 'info', "housekeeping: subdirs $subdir: cleaning";
- 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";
+ my $gccheck = sub {
+ if (!lstat "$gcdone") {
+ $! == ENOENT or hkfail "$gcdone: lstat: $!";
+ return 1, "touched recently, never gc'd!";
+ } elsif (-M _ <= $gcintervaldays) {
+ return 0, "touched recently, gc'd recently";
+ } else {
+ return 1, "touched recently, needs gc";
+ }
+ };
+ my ($needsgc, $gcmsg) = $gccheck->();
+ logm 'debug', "housekeeping: subdirs $subdir: $gcmsg";
+ next unless $needsgc;
+ $mode_what = 'garbage collecting';
+ $mode_locknb = 0;
+ $mode_action = sub {
+ my ($needsgc, $gcmsg) = $gccheck->();
+ if (!$needsgc) {
+ logm 'info',
+ "housekeeping: subdirs $subdir: someone else has gc'd";
+ return;
+ }
+ logm 'debug', "housekeeping: subdirs $subdir: $gcmsg (2)";
+ 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";
}
- 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";
+ 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";
}
- }
- };
- if (length $@) {
- chomp $@;
- logm 'warning', "housekeeping: $subdir: cleanup prevented: $@";
+ };
} else {
- unlink $lock or hkfail "remove $lock: $!";
+ $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|$mode_locknb, 0) {
+ die $! unless $mode_locknb;
+ logm 'info', "housekeeping: subdirs $subdir: lock busy, skipping";
+ next;
}
+ 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: $!";
sub housekeepingcheck ($$) {
my ($dofork, $force) = @_;
if (!$force) {
- if (!lockfile \*HLOCK, "Housekeeping.lock", LOCK_EX|LOCK_NB) {
+ if (!lockfile \*HLOCK, "Housekeeping.lock", LOCK_EX|LOCK_NB, 1) {
logm 'debug', "housekeeping lock taken, not running";
close HLOCK;
return 0;
~ian / chiark-utils.git / blobdiff