git.zerfleddert.de Git - m1-debian/blob - files/rc.local

   1 #!/usr/bin/perl
   2
   3 # [x] resize root filesystem
   4 # [x] find root fs uuid
   5 # [x] find boot partition
   6 # [x] generate fstab
   7 # [x] mount /boot/efi
   8 # [ ] install grub
   9 # [ ] extract wifi firmware
  10 # [ ] reboots if grub or wifi firmware has changed
  11
  12 sub
  13 find_root_device
  14 {
  15         open(MOUNT, '<', '/proc/mounts') || die ("Can not open /proc/mounts for reading: $!");
  16         my @lines = <MOUNT>;
  17         close(MOUNT);
  18
  19         for (@lines) {
  20                 if (/^([\S]+)+ \/ /) {
  21                         return $1;
  22                 }
  23         }
  24
  25         die("Could not find root device");
  26 }
  27
  28 sub
  29 find_fs_uuid_of_device
  30 {
  31         my $dev = shift || die;
  32         my $blkid_output = `blkid ${dev}`;
  33         # /dev/nvme0n1p5: LABEL="/" UUID="fe9c5ac8-edf4-442e-a09e-e0451606898e" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="primary" PARTUUID="03378b79-346d-42f9-b404-44b22bc6798f"
  34         if ($blkid_output =~ /UUID="([^"]+)"/) {
  35                 return $1;
  36         }
  37
  38         die("Could not find fs uuid of $dev");
  39 }
  40
  41 sub
  42 find_efi_parition
  43 {
  44         my $uuid_in_grub_cfg = shift || die;
  45         my @candidates;
  46
  47         my $efi_parition = undef;
  48
  49         for (`blkid`) {
  50                 if (/^([\S]+):.*TYPE="vfat"/) {
  51                         push(@candidates, $1);
  52                 }
  53         }
  54
  55         for my $dev (@candidates) {
  56                 system("mount -o ro $dev /mnt");
  57                         if (-f '/mnt/EFI/boot/grub.cfg') {
  58                                 open(GRUBCFG, '<', '/mnt/EFI/boot/grub.cfg') || die ("Can't open /mnt/EFI/boot/grub.cfg: $!");
  59                                 my @lines = <GRUBCFG>;
  60                                 for (@lines) {
  61                                         if (/${uuid_in_grub_cfg}/) {
  62                                                 $efi_parition = $dev;
  63                                         }
  64                                 }
  65                                 close(GRUBCFG);
  66                         }
  67                 system("umount /mnt");
  68                 last if defined $efi_parition;
  69         }
  70
  71         die ("No efi parition found") unless defined $efi_parition;
  72
  73         return $efi_parition;
  74 }
  75
  76 sub
  77 generate_fstab
  78 {
  79         my $root_fs_uuid = shift || die;
  80         my $efi_fs_uuid = shift || die;
  81
  82         open(FSTAB, '>', '/etc/fstab') || die ("Can not open fstab");
  83         print FSTAB <<EOF;
  84
  85 UUID="$root_fs_uuid" /         ext4 defaults 0 0
  86 UUID="$efi_fs_uuid"  /boot/efi vfat defaults 0 0
  87 EOF
  88         close(FSTAB);
  89 }
  90
  91 my $root_block_device = undef;
  92 my $root_fs_uuid = undef;
  93 my $efi_block_device = undef;
  94 my $efi_fs_uuid = undef;
  95
  96 unless (-f '/etc/fstab') {
  97         $root_block_device = find_root_device();
  98         system("resize2fs $root_block_device");
  99         $root_fs_uuid = find_fs_uuid_of_device($root_block_device);
 100         $efi_block_device = find_efi_parition($root_fs_uuid);
 101         $efi_fs_uuid = find_fs_uuid_of_device($efi_block_device);
 102         generate_fstab($root_fs_uuid, $efi_fs_uuid);
 103         system('mount /boot/efi');
 104 }