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1#!/usr/bin/perl
2
3my $firmware_tarball = '/boot/efi/vendorfw/firmware.tar';
4my $firmware_manifest = '/lib/firmware/ASAHI_FIRMWARE_MANIFEST';
5my $grubcfg = '/mnt/EFI/debian/grub.cfg';
6
7sub
8find_root_device
9{
10 open(MOUNT, '<', '/proc/mounts') || die ("Can not open /proc/mounts for reading: $!");
11 my @lines = <MOUNT>;
12 close(MOUNT);
13
14 for (@lines) {
15 if (/^([\S]+)+ \/ /) {
16 return $1;
17 }
18 }
19
20 die("Could not find root device");
21}
22
23sub
24find_fs_uuid_of_device
25{
26 my $dev = shift || die;
27 my $blkid_output = `blkid ${dev}`;
28
29 if ($blkid_output =~ /UUID="([^"]+)"/) {
30 return $1;
31 }
32
33 die("Could not find fs uuid of $dev");
34}
35
36sub
37find_efi_parition
38{
39 my $uuid_in_grub_cfg = shift || die;
40 my @candidates;
41
42 my $efi_parition = undef;
43
44 for (`blkid`) {
45 if (/^([\S]+):.*TYPE="vfat"/) {
46 push(@candidates, $1);
47 }
48 }
49
50 for my $dev (@candidates) {
51 system("mount -o ro $dev /mnt");
52 if (-f $grubcfg) {
53 open(GRUBCFG, '<', $grubcfg) || die ("Can't open $grubcfg: $!");
54 my @lines = <GRUBCFG>;
55 for (@lines) {
56 if (/${uuid_in_grub_cfg}/) {
57 $efi_parition = $dev;
58 }
59 }
60 close(GRUBCFG);
61 }
62 system("umount /mnt");
63 last if defined $efi_parition;
64 }
65
66 die ("No efi parition found") unless defined $efi_parition;
67
68 return $efi_parition;
69}
70
71sub
72generate_fstab
73{
74 my $root_fs_uuid = shift || die;
75 my $efi_fs_uuid = shift || die;
76
77 open(FSTAB, '>', '/etc/fstab') || die ("Can not open fstab");
78 print FSTAB <<EOF;
79UUID="$root_fs_uuid" / ext4 defaults 0 0
80UUID="$efi_fs_uuid" /boot/efi vfat defaults 0 0
81EOF
82 close(FSTAB);
83}
84
85sub
86install_grub
87{
88 system('rm -rf /boot/efi/EFI');
89 system('apt-get install -y grub-efi-arm64-signed-');
90 system("echo 'grub-efi-arm64 grub2/update_nvram boolean false' | debconf-set-selections");
91 system("echo 'grub-efi-arm64 grub2/force_efi_extra_removable boolean true' | debconf-set-selections");
92 system('dpkg-reconfigure -fnoninteractive grub-efi-arm64');
93 system('update-grub');
94 system('grub-install --removable /boot/efi');
95}
96
97sub
98update_wifi_firmware_if_necessary
99{
100 return unless -f $firmware_tarball;
101
102 if (-f $firmware_manifest) {
103 system("sha256sum -c $firmware_manifest --quiet");
104 return if $? == 0;
105 }
106
107 system("sha256sum $firmware_tarball > $firmware_manifest");
108 system("tar -C /lib/firmware/ -xf $firmware_tarball");
109
110 unlink('/etc/modprobe.d/blacklist.conf');
111 system('modprobe brcmfmac');
112}
113
114my $root_block_device = undef;
115my $initial_root_fs_uuid = undef;
116my $efi_block_device = undef;
117my $efi_fs_uuid = undef;
118
119unless (-f '/boot/grub/grub.cfg') {
120 $root_block_device = find_root_device();
121 system("resize2fs $root_block_device");
122 $initial_root_fs_uuid = find_fs_uuid_of_device($root_block_device);
123 $efi_block_device = find_efi_parition($initial_root_fs_uuid);
124 $efi_fs_uuid = find_fs_uuid_of_device($efi_block_device);
125 generate_fstab($initial_root_fs_uuid, $efi_fs_uuid);
126 system('mount /boot/efi');
127 install_grub();
128}
129
130update_wifi_firmware_if_necessary();
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