no_comment

1 files changed, 83 insertions, 0 deletions

diff --git a/perl-install/loopback.pm b/perl-install/loopback.pm
new file mode 100644
index 000000000..d992f4dec
--- /dev/null
+++ b/perl-install/loopback.pm
@@ -0,0 +1,83 @@
+package loopback;
+
+use diagnostics;
+use strict;
+
+#-######################################################################################
+#- misc imports
+#-######################################################################################
+use common qw(:common :system :file);
+use partition_table qw(:types);
+use commands;
+use fs;
+use log;
+
+
+sub file {
+    my ($part) = @_;
+    ($part->{device}{mntpoint} || die "loopback::file but loopback file has no associated mntpoint") . 
+      $part->{loopback_file};
+}
+
+sub ffile { "$_[0]{device}{mntpoint}$_[0]{loopback_file}" }
+
+sub loopbacks {
+    map { map { @{$_->{loopback} || []} } partition_table::get_normal_parts($_) } @_;
+}
+
+sub format_part {
+    my ($part) = @_;
+    my $prefix = $::isStandalone ? '' : $::o->{prefix};
+    fs::mount_part($part->{device}, $prefix);
+    my $f = create($part);
+    local $part->{device} = $f;
+    fs::real_format_part($part);
+}
+
+sub create {
+    my ($part) = @_;
+    my $f = "$part->{device}{mntpoint}$part->{loopback_file}";
+    return $f if -e $f;
+
+    eval { commands::mkdir_("-p", dirname($f)) };
+    
+    local *F;
+    open F, ">$f" or die "failed to create loopback file";
+    for (my $nb = $part->{size}; $nb >= 0; $nb -= 8) { #- 8 * 512 = 4096 :)
+	print F "\0" x 4096;
+    }
+    $f;
+}
+
+sub getFree {
+    my ($part, $prefix) = @_;
+
+    unless ($part->{freespace}) {
+	$part->{isFormatted} || !$part->{notFormatted} or return;
+	isMountableRW($part) or return;
+
+	my $dir = "/tmp/loopback_tmp";
+	if ($part->{isMounted}) {
+	    $dir = ($prefix || '') . $part->{mntpoint};
+	} else {
+	    mkdir $dir, 0700;
+	    fs::mount($part->{device}, $dir, type2fs($part->{type}), 'rdonly');
+	}
+	my $buf = ' ' x 20000;
+	syscall_('statfs', $dir, $buf) or return;
+	my (undef, $blocksize, $size, undef, $free, undef) = unpack "L2L4", $buf;
+	$_ *= $blocksize / 512 foreach $size, $free;
+
+	
+	unless ($part->{isMounted}) {
+	    fs::umount($dir);
+	    unlink $dir;
+	}
+
+	$part->{freespace} = $free;
+    }
+    $part->{freespace} - sum map { $_->{size} } @{$part->{loopback} || []};
+}
+
+1;
+