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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 }
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