/[42-fs]/42.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /42.pl

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Revision 5 - (show annotations)
Sun Jul 19 13:33:51 2009 UTC (9 years, 10 months ago) by dpavlin
File MIME type: text/plain
File size: 3151 byte(s)
added --skip to skip over existing files (useful for re-runs)
minor size calculation tweaks (still incorrect)

1 #!/usr/bin/perl
2
3 use warnings;
4 use strict;
5
6 use File::Slurp;
7 use File::Path;
8 use Getopt::Long;
9 use Data::Dump qw/dump/;
10
11 my $dev = '/dev/sdb';
12 my $mnt = '/mnt/42';
13
14 my ( $verbose, $skip, $init, $debug ) = ( 0, 1 );
15
16 GetOptions(
17 'verbose!' => \$verbose,
18 'skip!' => \$skip,
19 'init!' => \$init,
20 'debug!' => \$debug,
21 ) or die "unknown options: $!";
22
23
24 sub size {
25 my $size = shift;
26 $size =~ s{MB}{};
27 $size;
28 }
29
30 my @part;
31
32 sub partitions {
33 @part = ();
34 open(my $parted, '-|', "parted -s $dev unit mb print free") || die "parted: $!";
35 while(<$parted>) {
36 chomp;
37 s{^\s+}{};
38 next unless $_;
39 my @p = map { size($_) } split(/\s+/, $_ );
40 warn "## $_ ",dump( @p ) if $debug;
41 if ( $p[3] && $p[3] eq 'Free' ) {
42 $part[0] = [ @p ];
43 } elsif ( $p[0] =~ m{^\d+$} ) {
44 my $nr = shift @p;
45 $part[$nr] = [ @p ];
46 } else {
47 warn "SKIP ",dump( @p ) if $debug;
48 }
49 }
50 warn "# part = ",dump( @part ) if $verbose;
51 return @part;
52 }
53
54 sub mount_42 {
55 my $node = $dev . '1';
56 if ( ! -e $node ) {
57 print STDERR "wait for $node";
58 sleep 1;
59 while ( ! -e $node ) {
60 print STDERR ".";
61 sleep 1;
62 }
63 }
64 warn " ready\n+ mount $node $mnt\n";
65 system("mount $node $mnt") == 0 or die "can't mount: $!";
66 }
67
68 my $remount_on = qr/(mkpart|rm)/;
69
70 sub parted {
71 my $command = shift;
72 my @before = partitions();
73
74 system "umount $mnt" if $command =~ $remount_on;
75
76 warn "+ $command\n";
77 system("parted -s $dev unit mb $command") == 0 or die "parted: $?";
78 if ( $command =~ $remount_on ) {
79 my @part = partitions();
80 while ( $#before == $#part ) {
81 warn "re-read partition table\n";
82 sleep 1;
83 @part = partitions();
84 }
85 mount_42 if $part[1];
86 }
87 }
88
89 partitions();
90
91 if ( $init ) {
92 parted("rm $_") foreach grep { defined $part[$_] } map { $#part - $_ + 1 } ( 1 .. $#part );
93 parted("mkpartfs primary ext2 0 42MB");
94 parted("mkpart extended 42MB " . $part[0]->[1] . 'MB');
95 my $cmd = read_file($0);
96 write_file( "$mnt/42.pl", $cmd );
97 chmod 0755, "$mnt/42.pl";
98 exit;
99 }
100
101 map { mkdir $_ unless -e $_ } map { "$mnt/$_" } ( 'log', 'fs', 'stat' );
102
103 my $path = shift @ARGV || die "usage: $0 /path/to/file\n";
104
105 my ($dir,$file) = ($1,$2) if $path =~ m{^(?:(.+)/)?([^/]+)};
106
107 my $fs = "$mnt/fs/$dir";
108 mkpath $fs unless -e $fs;
109
110 $fs .= '/' . $file;
111 if ( -e $fs ) {
112 if ( $skip ) {
113 warn "SKIP $fs\n";
114 exit 0;
115 } else {
116 die "$fs exists! re-run with --skip\n";
117 }
118 }
119
120 my @stat = stat($path);
121 die "can't stat $path: $!" unless @stat;
122 warn "# $path ",$stat[7],$/;
123
124 my $size_mb = $stat[7] / 1000 / 1000; # FIXME correctly round to something?
125 my ( $free_start, undef, $free_size ) = @{$part[0]};
126
127 my $part_end = int( $free_start + $size_mb + 1 );
128
129 my $last_part = $#part;
130
131 parted("mkpart logical ${free_start}MB ${part_end}MB ");
132
133 my $part_size = $part[$#part]->[2] || die "can't get size of new partition";
134
135 die "not enough space on $dev $size_mb > $part_size" if $size_mb > $part_size;
136
137 my $part_nr = $#part;
138
139 write_file( "$mnt/stat/$part_nr", join("\n",@stat) );
140
141 my $log = "$mnt/log/$part_nr";
142
143 my $to_dev = $dev . $part_nr;
144
145 symlink( $to_dev ,$fs) || die "can't create $fs: $!";
146
147 my $cmd = "dd_rescue -w -l $log $path $to_dev";
148 print "+ $cmd\n";
149 exec $cmd;

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