tests/util/grub-shell-luks-tester: Find cryptodisk by UUID

GRUB has the capability to search all the disks for a cryptodisk of a
given UUID. Use this instead of hardcoding which disk is the cryptodisk,
which can change when devices are added or removed, or potentially when
QEMU is upgraded. This can not be done for the detached header tests
because the header contains the UUID.

Also, capitalize comment lines for consistency.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

tests/util/grub-shell-luks-tester.in

@@ -30,6 +30,7 @@ PATH="${builddir}:$PATH"
 export PATH
 
 grub_shell_opts=
+disk=
 disksize=20M
 detached_header=
 keyfile=
@@ -68,18 +69,6 @@ EOF
 
 . "${builddir}/grub-core/modinfo.sh"
 
-# TODO: We should be selecting the drive based on disk id, change this once
-# grub support searching by disk id.
-disk="hd0"
-case "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" in
-    i386-qemu)
-	disk="ata0"
-	;;
-    loongarch64-efi)
-	disk="hd1"
-	;;
-esac
-
 # Check the arguments.
 for option in "$@"; do
     case "$option" in
@@ -158,7 +147,7 @@ get_random_bytes() {
         | tr -d '\0' | dd bs=1 count=$(($NUM_BYTES)) 2>/dev/null
 }
 
-# create a random directory to be hold generated files
+# Create a random directory to be hold generated files
 lukstestdir="`mktemp -d "${TMPDIR:-/tmp}/$(basename "$0").XXXXXXXXXX"`" || exit 20
 luksfile=$lukstestdir/luks.disk
 lukshdrfile=$lukstestdir/luks.header
@@ -185,14 +174,21 @@ if [ -n "$detached_header" ]; then
     csopts="$csopts --header $lukshdrfile"
 fi
 
-# create the key file
+# Create the key file
 echo -n "$password" > $lukskeyfile
 
 # Create a very small LUKS container for the test
 truncate -s $disksize $luksfile || exit 21
 
 # Format the luks disk file
-cryptsetup luksFormat -q $csopts $luksfile $lukskeyfile || exit 22
+cryptsetup luksFormat -q $csopts ${luksfile} ${lukskeyfile} || exit 22
+if [ -z "$detached_header" ]; then
+    cryptomount_opts="$cryptomount_opts -u $(cryptsetup luksUUID ${luksdiskfile})"
+elif [ -z "$disk" ]; then
+    # In detached header mode, so must pass the disk to cryptomount.
+    # Is this always correct?
+    disk=hd0
+fi
 
 # Run any cryptsetup scripts
 export luksdiskfile
@@ -264,7 +260,7 @@ fi
 # Can not use --disk with a raw LUKS container because it appears qemu
 # tries to convert the image to and is failing with:
 #  "Parameter 'key-secret' is required for cipher"
-qemuopts="$qemuopts -drive file=$luksfile,index=0,media=disk,format=raw"
+qemuopts="$qemuopts -drive file=$luksfile,media=disk,format=raw"
 
 # Add crypto modules
 modules="$modules cryptodisk luks luks2 fat"
@@ -282,7 +278,8 @@ grub_keyfile_size="$keyfile_size"
 vfilename="`basename $vfile`"
 vtext="$vtext"
 trim_line="$trim_line"
-disk="$disk"
+disk="${disk:+($disk)}"
+cryptomount_opts="$cryptomount_opts"
 EOF
 
 # If testing keyfiles, do not use password variable
@@ -325,7 +322,7 @@ fi
 cdisk=crypto0
 
 if test -n "$grub_debug" -a "$grub_debug" -gt 0; then
-    echo cmd: cryptomount $cryptomount_opts ($disk)
+    echo cmd: cryptomount $cryptomount_opts $disk
     echo -n "devices: "
     ls
 fi
@@ -333,7 +330,7 @@ fi
 if test -n "$grub_debug" -a "$grub_debug" -gt 1; then
     set debug=all
 fi
-cryptomount $cryptomount_opts ($disk)
+cryptomount $cryptomount_opts $disk
 ret="$?"
 if test -n "$grub_debug" -a "$grub_debug" -eq 2; then
     set debug=