/[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!
ViewVC logotype

Annotation of /42.pl

Parent Directory Parent Directory | Revision Log Revision Log


Revision 3 - (hide annotations)
Sun Jul 19 11:55:06 2009 UTC (10 years, 3 months ago) by dpavlin
File MIME type: text/plain
File size: 2581 byte(s)
rewrite to use parted and extended partition to store files

1 dpavlin 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 dpavlin 3 use Data::Dump qw/dump/;
10 dpavlin 1
11 dpavlin 3 my $dev = '/dev/sdb';
12 dpavlin 1 my $mnt = '/mnt/42';
13    
14 dpavlin 3 my ( $init, $debug );
15 dpavlin 1
16     GetOptions(
17 dpavlin 3 'init!' => \$init,
18     'debug!' => \$debug,
19 dpavlin 1 ) or die "unknown options: $!";
20    
21    
22 dpavlin 3 my @part;
23 dpavlin 1
24 dpavlin 3 sub partitions {
25     open(my $parted, '-|', "parted -s $dev unit mb print free") || die "parted: $!";
26     while(<$parted>) {
27     warn "## $_" if $debug;
28     if ( m{^\s+([\d\.]+)MB\s+([\d\.]+)MB\s+([\d\.]+)MB\s+Free Space} ) {
29     $part[0] = [ $1, $2, $3, 'free' ];
30     }
31     next unless m{^\s+\d+\s+};
32     s{^\s+}{};
33     s{([\d\.]+)MB}{$1}g;
34     my ( $nr, $start, $end, $size, undef ) = split(/\s+/, $_, 5);
35     $part[$nr] = [ $start, $end, $size ];
36     }
37     warn "## part = ",dump( @part ) if $debug;
38     return @part;
39     }
40 dpavlin 1
41 dpavlin 3 sub parted {
42     my $command = shift;
43     warn "+ $command\n";
44     system("parted -s $dev unit mb $command") == 0 or die "parted: $!";
45     }
46 dpavlin 1
47    
48 dpavlin 3 if ( $init ) {
49     system("umount $mnt");
50     partitions();
51     parted("rm $_") foreach grep { defined $part[$_] } ( 1 .. 4 );
52     parted("mkpartfs primary ext2 0 42MB");
53     partitions();
54     parted("mkpart extended 42MB " . $part[0]->[1] . 'MB');
55     system "sync;sync";
56     partitions();
57     system("mount ${dev}1 $mnt") == 0 or die "can't mount: $!";
58     my $cmd = read_file($0);
59     write_file( "$mnt/42.pl", $cmd );
60     chmod 0755, "$mnt/42.pl";
61     exit;
62 dpavlin 1 }
63    
64 dpavlin 3 map { mkdir $_ unless -e $_ } map { "$mnt/$_" } ( 'log', 'fs', 'stat' );
65 dpavlin 1
66 dpavlin 3 my $path = shift @ARGV || die "usage: $0 /path/to/file\n";
67 dpavlin 1
68 dpavlin 3 my ($dir,$file) = ($1,$2) if $path =~ m{^(?:(.+)/)?([^/]+)};
69 dpavlin 1
70     my $fs = "$mnt/fs/$dir";
71 dpavlin 2 mkpath $fs unless -e $fs;
72 dpavlin 1
73     $fs .= '/' . $file;
74 dpavlin 2 die "$fs exists!" if -e $fs;
75    
76 dpavlin 3 my @stat = stat($path);
77     die "can't stat $path: $!" unless @stat;
78     warn "# $path ",$stat[7],$/;
79 dpavlin 2
80 dpavlin 3 partitions();
81 dpavlin 2
82 dpavlin 3 my $size_mb = int( $stat[7] / 1000 / 1000 ) + 1;
83     my ( $free_start, undef, $free_size ) = @{$part[0]};
84 dpavlin 2
85 dpavlin 3 my $part_end = $free_start + $size_mb;
86    
87     my $last_part = $#part;
88    
89     system("umount $mnt");
90     parted("mkpart logical ${free_start}MB ${part_end}MB");
91     partitions();
92     system("mount ${dev}1 $mnt") == 0 or die "can't mount $mnt: $!";
93    
94     my $part_size = $part[$#part]->[2] || die "can't get size of new partition";
95    
96     die "not enough space on $dev $size_mb > $part_size" if $size_mb > $part_size;
97    
98     my $part_nr = $#part;
99    
100     die "can't create partition $last_part == $part_nr" if $last_part == $part_nr;
101    
102     write_file( "$mnt/stat/$part_nr", join("\n",@stat) );
103    
104     my $log = "$mnt/log/$part_nr";
105    
106     my $to_dev = $dev . $part_nr;
107    
108     symlink( $to_dev ,$fs) || die "can't create $fs: $!";
109    
110     my $cmd = "dd_rescue -w -l $log $path $to_dev";
111     print "+ $cmd\n";
112     exec $cmd;

Properties

Name Value
svn:executable *

  ViewVC Help
Powered by ViewVC 1.1.26