44 lines
1.5 KiB
Perl
44 lines
1.5 KiB
Perl
#!/usr/bin/perl -w
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sub status_system ($$) {
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my ($command, $message) = @_;
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$status = system($command);
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$status <<= 8;
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if ($status < 0) {
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print STDERR "$!\n";
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}
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if ($status != 0) {
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print STDERR "$message\n";
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}
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}
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sub extendinitrd ($$) {
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my ($initrd, $nblocks) = @_;
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if ($nblocks <= 1440) {
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print STDERR "nblocks must be >= 1440\n";
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return (1);
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}
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(undef, $type, undef, $fnlen, undef) = split(' ', `file $initrd`, 5);
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print "$type $fnlen\n";
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if ($type ne 'Minix' || $fnlen != 30) {
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die "Can only handle Minix initrds with 30 char filenames\n";
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return (1);
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}
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status_system("dd if=/dev/zero of=newinitrd bs=1k count=$nblocks", "Cannot create new initrd\n");
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status_system("mkfs.minix -n 30 newinitrd $nblocks", "Cannot mkfs.minix new initrd\n");
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mkdir("initrd.from") || print STDERR "Cannot make temp mount point initrd.from\n";
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mkdir("initrd.to") || print STDERR "Cannot make temp mount point initrd.to\n";
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status_system("mount -o ro,loop $initrd initrd.from", "Cannot mount $initrd on initrd.from");
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status_system("mount -o loop newinitrd initrd.to", "Cannot mount newinitrd on initrd.to");
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status_system("cp -a initrd.from/* initrd.to/", "Cannot copy initrd to newinitrd");
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status_system("umount initrd.from", "Cannot umount initrd.from");
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status_system("umount initrd.to", "Cannot umount initrd.to");
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rmdir("initrd.from") || print STDERR "Cannot remove temp mount point initrd.from\n";
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rmdir("initrd.to") || print STDERR "Cannot remove temp mount point initrd.to\n";
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return (0);
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}
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1;
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