copy-firmware.sh: flesh out and fix dedup-firmware.sh

Flesh out the de-duplication logic in separate script. The copy-firmware.sh is
already complex enough and de-duplication doesn't really fit in there.

In the process we migrate away from the open-coded `ln --relative`. We also
avoid touching symlinks, which are not created by rdfind. Otherwise we end up
"fixing" the folder to folder symlinks (created earlier in the process) and
things explode.

As result we also get a few bonuses:
 - the COPYOPTS shell injection is gone - the variable was never used
 - people can dedup as separate step if/when they choose to do so

Aside: based on the noise in git log and around distros ... I'm wondering if
having the de-duplication as opt-in, would have been better. Is it too late to
change or the ship has sailed?

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

Makefile

@@ -26,21 +26,22 @@ deb:
 rpm:
 	./build_packages.py --rpm
 
-install:
-	install -d $(DESTDIR)$(FIRMWAREDIR)
-	./copy-firmware.sh $(COPYOPTS) $(DESTDIR)$(FIRMWAREDIR)
+install: install-nodedup
+	./dedup-firmware.sh $(DESTDIR)$(FIRMWAREDIR)
 
 install-nodedup:
 	install -d $(DESTDIR)$(FIRMWAREDIR)
-	./copy-firmware.sh --ignore-duplicates $(DESTDIR)$(FIRMWAREDIR)
+	./copy-firmware.sh $(DESTDIR)$(FIRMWAREDIR)
 
 install-xz:
 	install -d $(DESTDIR)$(FIRMWAREDIR)
 	./copy-firmware.sh --xz $(DESTDIR)$(FIRMWAREDIR)
+	./dedup-firmware.sh $(DESTDIR)$(FIRMWAREDIR)
 
 install-zst:
 	install -d $(DESTDIR)$(FIRMWAREDIR)
 	./copy-firmware.sh --zstd $(DESTDIR)$(FIRMWAREDIR)
+	./dedup-firmware.sh $(DESTDIR)$(FIRMWAREDIR)
 
 clean:
 	rm -rf release dist

check_whence.py

@@ -91,6 +91,7 @@ def main():
             "contrib/templates/debian.copyright",
             "contrib/templates/rpm.spec",
             "copy-firmware.sh",
+            "dedup-firmware.sh",
         ]
     )
     known_prefixes = set(name for name in whence_list if name.endswith("/"))

copy-firmware.sh

@@ -9,7 +9,6 @@ prune=no
 # shellcheck disable=SC2209
 compress=cat
 compext=
-skip_dedup=0
 
 while test $# -gt 0; do
     case $1 in
@@ -45,11 +44,6 @@ while test $# -gt 0; do
             shift
             ;;
 
-        --ignore-duplicates)
-            skip_dedup=1
-            shift
-            ;;
-
         -*)
             if test "$compress" = "cat"; then
                 echo "ERROR: unknown command-line option: $1"
@@ -75,13 +69,6 @@ if [ -z "$destdir" ]; then
 	exit 1
 fi
 
-if ! command -v rdfind >/dev/null; then
-	if [ "$skip_dedup" != 1 ]; then
-    		echo "ERROR: rdfind is not installed.  Pass --ignore-duplicates to skip deduplication"
-		exit 1
-	fi
-fi
-
 # shellcheck disable=SC2162 # file/folder name can include escaped symbols
 grep -E '^(RawFile|File):' WHENCE | sed -E -e 's/^(RawFile|File): */\1 /;s/"//g' | while read k f; do
     test -f "$f" || continue
@@ -95,16 +82,6 @@ grep -E '^(RawFile|File):' WHENCE | sed -E -e 's/^(RawFile|File): */\1 /;s/"//g'
     fi
 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")" "$l"
-	done
-fi
-
 # shellcheck disable=SC2162 # file/folder name can include escaped symbols
 grep -E '^Link:' WHENCE | sed -e 's/^Link: *//g;s/-> //g' | while read f d; do
     if test -L "$f$compext"; then

dedup-firmware.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Deduplicate files in a given destdir
+#
+
+err() {
+    echo "ERROR: $*"
+    exit 1
+}
+
+verbose=:
+destdir=
+while test $# -gt 0; do
+    case $1 in
+        -v | --verbose)
+            # shellcheck disable=SC2209
+            verbose=echo
+            ;;
+        *)
+            if test -n "$destdir"; then
+                err "unknown command-line options: $*"
+            fi
+
+            destdir="$1"
+            shift
+            ;;
+    esac
+done
+
+if test -z "$destdir"; then
+    err "destination directory was not specified."
+fi
+
+if ! test -d "$destdir"; then
+    err "provided directory does not exit."
+fi
+
+if ! command -v rdfind >/dev/null; then
+    err "rdfind is not installed."
+fi
+
+$verbose "Finding duplicate files"
+rdfind -makesymlinks true -makeresultsfile true "$destdir" >/dev/null
+
+grep DUPTYPE_WITHIN_SAME_TREE results.txt | grep -o "$destdir.*" | while read -r l; do
+    target="$(realpath "$l")"
+    $verbose "Correcting path for $l"
+    ln --force --symbolic --relative "$target" "$l"
+done
+
+rm results.txt