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#!/usr/bin/perl |
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|
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use warnings; |
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use strict; |
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|
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use File::Slurp; |
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use File::Path; |
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use Getopt::Long; |
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use Data::Dump qw/dump/; |
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|
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my $dev = '/dev/sdb'; |
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my $mnt = '/mnt/42'; |
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|
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my ( $verbose, $skip, $init, $debug ) = ( 0, 1 ); |
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|
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GetOptions( |
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'verbose!' => \$verbose, |
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'skip!' => \$skip, |
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'init!' => \$init, |
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'debug!' => \$debug, |
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) or die "unknown options: $!"; |
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|
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|
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sub size { |
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my $size = shift; |
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$size =~ s{MB}{}; |
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$size; |
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} |
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|
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my @part; |
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|
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sub partitions { |
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@part = (); |
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open(my $parted, '-|', "parted -s $dev unit mb print free") || die "parted: $!"; |
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while(<$parted>) { |
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chomp; |
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s{^\s+}{}; |
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next unless $_; |
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my @p = map { size($_) } split(/\s+/, $_ ); |
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warn "## $_ ",dump( @p ) if $debug; |
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if ( $p[3] && $p[3] eq 'Free' ) { |
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$part[0] = [ @p ]; |
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} elsif ( $p[0] =~ m{^\d+$} ) { |
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my $nr = shift @p; |
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$part[$nr] = [ @p ]; |
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} else { |
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warn "SKIP ",dump( @p ) if $debug; |
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} |
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} |
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warn "# part = ",dump( @part ) if $verbose; |
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return @part; |
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} |
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|
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sub mount_42 { |
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my $node = $dev . '1'; |
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if ( ! -e $node ) { |
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print STDERR "wait for $node"; |
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sleep 1; |
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while ( ! -e $node ) { |
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print STDERR "."; |
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sleep 1; |
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} |
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} |
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warn " ready\n+ mount $node $mnt\n"; |
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system("mount $node $mnt") == 0 or die "can't mount: $!"; |
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} |
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|
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my $remount_on = qr/(mkpart|rm)/; |
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|
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sub parted { |
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my $command = shift; |
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my @before = partitions(); |
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|
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system "umount $mnt" if $command =~ $remount_on; |
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|
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warn "+ $command\n"; |
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system("parted -s $dev unit mb $command") == 0 or die "parted: $?"; |
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if ( $command =~ $remount_on ) { |
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my @part = partitions(); |
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while ( $#before == $#part ) { |
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warn "re-read partition table\n"; |
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sleep 1; |
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@part = partitions(); |
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} |
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mount_42 if $part[1]; |
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} |
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} |
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|
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partitions(); |
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|
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if ( $init ) { |
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parted("rm $_") foreach grep { defined $part[$_] } map { $#part - $_ + 1 } ( 1 .. $#part ); |
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parted("mkpartfs primary ext2 0 42MB"); |
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parted("mkpart extended 42MB " . $part[0]->[1] . 'MB'); |
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my $cmd = read_file($0); |
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write_file( "$mnt/42.pl", $cmd ); |
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chmod 0755, "$mnt/42.pl"; |
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exit; |
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} |
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|
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map { mkdir $_ unless -e $_ } map { "$mnt/$_" } ( 'log', 'fs', 'stat' ); |
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|
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my $path = shift @ARGV || die "usage: $0 /path/to/file\n"; |
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|
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my ($dir,$file) = ($1,$2) if $path =~ m{^(?:(.+)/)?([^/]+)}; |
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|
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my $fs = "$mnt/fs/$dir"; |
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mkpath $fs unless -e $fs; |
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|
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$fs .= '/' . $file; |
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if ( -e $fs ) { |
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if ( $skip ) { |
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warn "SKIP $fs\n"; |
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exit 0; |
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} else { |
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die "$fs exists! re-run with --skip\n"; |
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} |
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} |
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|
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my @stat = stat($path); |
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die "can't stat $path: $!" unless @stat; |
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warn "# $path ",$stat[7],$/; |
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|
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my $size_mb = $stat[7] / 1000 / 1000; # FIXME correctly round to something? |
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my ( $free_start, undef, $free_size ) = @{$part[0]}; |
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|
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my $part_end = int( $free_start + $size_mb + 1 ); |
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|
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my $last_part = $#part; |
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|
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parted("mkpart logical ${free_start}MB ${part_end}MB "); |
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|
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my $part_size = $part[$#part]->[2] || die "can't get size of new partition"; |
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|
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die "not enough space on $dev $size_mb > $part_size" if $size_mb > $part_size; |
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|
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my $part_nr = $#part; |
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|
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write_file( "$mnt/stat/$part_nr", join("\n",@stat) ); |
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|
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my $log = "$mnt/log/$part_nr"; |
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|
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my $to_dev = $dev . $part_nr; |
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|
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symlink( $to_dev ,$fs) || die "can't create $fs: $!"; |
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|
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my $cmd = "dd_rescue -w -l $log $path $to_dev"; |
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print "+ $cmd\n"; |
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exec $cmd; |
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