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replace xpath with xmllint --xpath; simplify

Browse source 
As mentioned in previous commit, Big Sur changes the syntax for the
xpath command slightly.

In the process of testing out replacements for these, I noticed a few
small simplification wins.
This commit is contained in:
Travis A. Everett 2020-09-08 00:45:27 -05:00
parent 1f02b65c59
commit e736f8f6e4
1 changed files with 8 additions and 38 deletions
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46
scripts/create-darwin-volume.sh
View file

@ -5,42 +5,13 @@ root_disk() {
diskutil info -plist /
}
apfs_volumes_for() {
disk=$1
diskutil apfs list -plist "$disk"
}
disk_identifier() {
xpath "/plist/dict/key[text()='ParentWholeDisk']/following-sibling::string[1]/text()" 2>/dev/null
}
volume_list_true() {
key=$1
xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict/key[text()='$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
# i.e., "disk1"
root_disk_identifier() {
diskutil info -plist / | xmllint --xpath "/plist/dict/key[text()='ParentWholeDisk']/following-sibling::string[1]/text()" -
}
find_nix_volume() {
disk=$1
i=1
volumes=$(apfs_volumes_for "$disk")
while true; do
name=$(echo "$volumes" | volume_get_string "Name" "$i")
if [ -z "$name" ]; then
break
fi
case "$name" in
[Nn]ix*)
echo "$name"
break
;;
esac
i=$((i+1))
done
diskutil apfs list -plist "$1" | xmllint --xpath "(/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict/key[text()='Name']/following-sibling::string[starts-with(translate(text(),'N','n'),'nix')]/text())[1]" - 2>/dev/null || true
}
test_fstab() {
@ -89,9 +60,7 @@ test_t2_chip_present(){
}
test_filevault_in_use() {
disk=$1
# list vols on disk | get value of Filevault key | value is true
apfs_volumes_for "$disk" | volume_list_true FileVault | grep -q true
fdesetup isactive >/dev/null
}
# use after error msg for conditions we don't understand
@ -143,12 +112,12 @@ main() {
fi
fi
disk=$(root_disk | disk_identifier)
disk="$(root_disk_identifier)"
volume=$(find_nix_volume "$disk")
if [ -z "$volume" ]; then
echo "Creating a Nix Store volume..." >&2
if test_filevault_in_use "$disk"; then
if test_filevault_in_use; then
# TODO: Not sure if it's in-scope now, but `diskutil apfs list`
# shows both filevault and encrypted at rest status, and it
# may be the more semantic way to test for this? It'll show
@ -178,6 +147,7 @@ main() {
if ! test_fstab; then
echo "Configuring /etc/fstab..." >&2
label=$(echo "$volume" | sed 's/ /\\040/g')
# shellcheck disable=SC2209
printf "\$a\nLABEL=%s /nix apfs rw,nobrowse\n.\nwq\n" "$label" | EDITOR=ed sudo vifs
fi
}