#!/bin/sh

function die()
{
    printf '%s\n' "$*" >&2
    exit 1
}

set -e

cd modalias.prov.testdata
test -x ../../modalias.prov || die "No ../../modalias.prov"

# Copy and add -t option to modalias.prov
cp ../../modalias.prov modalias.prov
patch -p1 <<"EOF"
--- a/modalias.prov
+++ b/modalias.prov
@@ -86,6 +86,17 @@ combine_modaliases() {
     print_modaliases "$class" "$variants" "$pos"
 }
 
+if [ "$#" = 2 ] && [ "$1" = "-t" ]; then
+    cat -- "$2" \
+    | { while read line; do echo "${#line} $line"; done } \
+    | LC_ALL=C sort -u \
+    | combine_modaliases \
+    >"$2.test"
+    echo "Comparing results for $2"
+    diff -u "$2.right" "$2.test" && rm -- "$2.test"
+    exit
+fi
+
 for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do
     # | head -n1 because some modules have *two* version tags. *cough*b44*cough*
     modver=$(/sbin/modinfo -F version "$module"| head -n1)
EOF

find | grep '\.ko.*\.modalias$' | xargs -n1 ./modalias.prov -t

# Rename newly generated .test as .right
#find | grep '\.ko.*\.modalias$' | xargs -I'{}' mv '{}'.test '{}'.right