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installer: refuse apfs volume creation when FileVault is enabled

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Daiderd Jordan 2020-03-26 21:51:13 +01:00
parent 3386575296
commit 477d7c2d07
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GPG key ID: D02435D05B810C96
2 changed files with 24 additions and 4 deletions
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6
doc/manual/installation/installing-binary.xml
View file

@ -230,8 +230,10 @@ LABEL=Nix\040Store /nix apfs rw
</para>
<para>
This new volume also won't be encrypted by default, and enabling is
only possible interactively?
This new volume also won't be encrypted by default, and enabling it
requires extra setup. For machines with a <link xlink:href="https://www.apple.com/euro/mac/shared/docs/Apple_T2_Security_Chip_Overview.pdf">T2 chip</link>
all data is already entrypted at rest, older hardware won't even when
FileVault is enabled for the rest of the system.
</para>
<screen>

22
scripts/create-darwin-volume.sh
View file

@ -14,7 +14,12 @@ disk_identifier() {
xpath "/plist/dict/key[text()='ParentWholeDisk']/following-sibling::string[1]/text()" 2>/dev/null
}
volume_get() {
volume_list_true() {
key=$1 t=$2
xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict/key[text()='$key']/following-sibling::true[1]" 2> /dev/null
}
volume_get_string() {
key=$1 i=$2
xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict[$i]/key[text()='$key']/following-sibling::string[1]/text()" 2> /dev/null
}
@ -24,7 +29,7 @@ find_nix_volume() {
i=1
volumes=$(apfs_volumes_for "$disk")
while true; do
name=$(echo "$volumes" | volume_get "Name" "$i")
name=$(echo "$volumes" | volume_get_string "Name" "$i")
if [ -z "$name" ]; then
break
fi
@ -54,6 +59,12 @@ test_nix() {
test -d "/nix"
}
test_filevault() {
disk=$1
apfs_volumes_for "$disk" | volume_list_true FileVault | grep -q true || return
! sudo xartutil --list >/dev/null 2>/dev/null
}
main() {
(
echo ""
@ -99,6 +110,13 @@ main() {
volume=$(find_nix_volume "$disk")
if [ -z "$volume" ]; then
echo "Creating a Nix Store volume..." >&2
if test_filevault "$disk"; then
echo "error: FileVault detected, refusing to create unencrypted volume" >&2
echo "See https://nixos.org/nix/manual/#sect-apfs-volume-installation" >&2
exit 1
fi
sudo diskutil apfs addVolume "$disk" APFS 'Nix Store' -mountpoint /nix
volume="Nix Store"
else