Make rdfind optional

A number of distributions don't include rdfind by default.  This is an
optimization, so make it optional via a --ignore-duplicates option and a
new make target.

Distributions that include rdfind should add it as a dependency for
their linux-firmware package.  Those that don't should use the new
target or option.

Signed-off-by: Josh Boyer <jwboyer@kernel.org>

Makefile

@@ -30,6 +30,10 @@ install:
 	install -d $(DESTDIR)$(FIRMWAREDIR)
 	./copy-firmware.sh $(DESTDIR)$(FIRMWAREDIR)
 
+install-nodedup:
+	install -d $(DESTDIR)$(FIRMWAREDIR)
+	./copy-firmware.sh --ignore-duplicates $(DESTDIR)$(FIRMWAREDIR)
+
 install-xz:
 	install -d $(DESTDIR)$(FIRMWAREDIR)
 	./copy-firmware.sh --xz $(DESTDIR)$(FIRMWAREDIR)

copy-firmware.sh

@@ -9,6 +9,7 @@ prune=no
 # shellcheck disable=SC2209
 compress=cat
 compext=
+skip_dedup=0
 
 while test $# -gt 0; do
     case $1 in
@@ -44,6 +45,11 @@ while test $# -gt 0; do
             shift
             ;;
 
+        --ignore-duplicates)
+            skip_dedup=1
+            shift
+            ;;
+
         -*)
             if test "$compress" = "cat"; then
                 echo "ERROR: unknown command-line option: $1"
@@ -70,8 +76,10 @@ if [ -z "$destdir" ]; then
 fi
 
 if ! command -v rdfind >/dev/null; then
-	echo "ERROR: rdfind is not installed"
-	exit 1
+	if [ "$skip_dedup" != 1 ]; then
+    		echo "ERROR: rdfind is not installed.  Pass --ignore-duplicates to skip deduplication"
+		exit 1
+	fi
 fi
 
 # shellcheck disable=SC2162 # file/folder name can include escaped symbols
@@ -87,13 +95,15 @@ grep -E '^(RawFile|File):' WHENCE | sed -E -e 's/^(RawFile|File): */\1 /;s/"//g'
     fi
 done
 
-$verbose "Finding duplicate files"
-rdfind -makesymlinks true -makeresultsfile false "$destdir" >/dev/null
-find "$destdir" -type l | while read -r l; do
-	target="$(realpath "$l")"
-	$verbose "Correcting path for $l"
-	ln -fs "$(realpath --relative-to="$(dirname "$(realpath -s "$l")")" "$target")" "$l"
-done
+if [ "$skip_dedup" != 1 ] ; then
+	$verbose "Finding duplicate files"
+	rdfind -makesymlinks true -makeresultsfile false "$destdir" >/dev/null
+	find "$destdir" -type l | while read -r l; do
+		target="$(realpath "$l")"
+		$verbose "Correcting path for $l"
+		ln -fs "$(realpath --relative-to="$(dirname "$(realpath -s "$l")")" "$target")" "$l"
+	done
+fi
 
 # shellcheck disable=SC2162 # file/folder name can include escaped symbols
 grep -E '^Link:' WHENCE | sed -e 's/^Link: *//g;s/-> //g' | while read f d; do