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#!/usr/bin/perl -w |
#!/usr/bin/perl -w |
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use strict; |
use strict; |
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use Shell qw/rsync vzlist lvcreate mount umount lvremove/; |
use Shell qw/rsync vzlist lvcreate mount umount lvremove which ssync lvdisplay mke2fs/; |
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my $vz = '/vz'; |
my $vz = '/vz'; |
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my $conf = '/etc/vz/conf'; |
my $conf = '/etc/vz/conf'; |
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my @v = split(/\s+/,$_); |
my @v = split(/\s+/,$_); |
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if ( $v[1] =~ m/\Q$vz\E/ ) { |
if ( $v[1] =~ m/\Q$vz\E/ ) { |
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$vz_lv = $v[0]; |
$vz_lv = $v[0]; |
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warn "found lv $vz_lv for $vz\n"; |
warn "found LV $vz_lv for $vz\n"; |
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last; |
last; |
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} |
} |
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} |
} |
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sub fs_quota { |
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my $id = shift; |
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open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!"; |
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my $l = <$q>; |
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$l =~ s/^\s+//; |
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my ( $usage, $soft, $hard ) = split(/\s+/,$l); |
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warn "quota for $id | $soft < $hard | usage: $usage\n"; |
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return ( $usage, $soft, $hard ) if wantarray; |
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return $soft; |
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} |
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sub copy_files { |
sub copy_files { |
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my ( $from, $to ) = @_; |
my ( $from, $to ) = @_; |
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warn "rsync $from -> $to\n"; |
if ( which('ssync') ) { |
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rsync('-ra', "$from/", "$to/" ); |
warn "ssync $from -> $to\n"; |
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ssync(qw{--log-mode file --log-path /dev/null},'-f',$from,'-t',$to); |
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} else { |
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warn "rsync $from -> $to\n"; |
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rsync('-ra', "$from/", "$to/" ); |
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} |
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} |
} |
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if ( $vz_lv ) { |
if ( $vz_lv ) { |
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my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! ); |
my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! ); |
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my $snap = $vz_lv_name . '-snap'; |
my $snap = $vz_lv_name . '-snap'; |
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my $clone = "$vz_lv_name-clone-$CVEID"; |
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print "Creating $snap_size snapshot $snap from $vz_lv\n"; |
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sub do_mount { |
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my ( $from, $to ) = @_; |
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mkdir $to || die "can't create $to: $!"; |
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print "Mounting $from to $to\n"; |
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mount( $from, $to, '-o', 'noatime' ); |
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} |
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sub test_mkdir { |
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my $dir = shift; |
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if ( ! -d $dir ) { |
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mkdir $dir || die "can't mkdir $dir: $!"; |
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} |
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} |
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sub mount_bind { |
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my ( $from, $to ) = @_; |
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die "$from doesn't exist!" unless -d $from; |
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test_mkdir( $to ); |
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mount( '--bind', $from, $to ); |
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} |
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print "Creating $snap_size snapshot $snap from $vz_lv\n"; |
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lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv ); |
lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv ); |
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my $snap_path = "/tmp/$snap"; |
do_mount( "$vz_lv_path/$snap", "/tmp/$snap" ); |
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mkdir $snap_path || die "can't create $snap_path: $!"; |
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my $clone_size = fs_quota( $VEID ) . 'k'; |
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my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! ); |
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if ( lvdisplay( "$vz_lv_path/$clone" ) ) { |
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warn "using existing $vz_lv_path/$clone\n"; |
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} else { |
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print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n"; |
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lvcreate( '--size', $clone_size, '--name', $clone, $vg_name ); |
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mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" ); |
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} |
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do_mount( "$vz_lv_path/$clone", "/tmp/$clone" ); |
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print "Mounting $vz_lv_path/$snap to $snap_path\n"; |
test_mkdir( "/tmp/$clone/private" ); |
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test_mkdir( "/tmp/$clone/root" ); |
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mount( "$vz_lv_path/$snap", $snap_path, '-o', 'noatime' ); |
mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" ); |
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mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" ); |
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copy_files( "$snap_path/private/$VEID", "$vz/private/$CVEID" ); |
copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" ); |
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print "Umount $snap_path and remove $vz_lv_path/$snap\n"; |
print "Cleanup\n"; |
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umount( $snap_path ); |
umount( "$vz_lv_path/$clone" ); |
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umount( "$vz_lv_path/$snap" ); |
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lvremove( '-f', "$vz_lv_path/$snap" ); |
lvremove( '-f', "$vz_lv_path/$snap" ); |
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