From upstream
https://git.savannah.nongnu.org/cgit/quilt.git/patch/?id=f73f8d7f71de2878d3f92881a5fcb8eafd78cb5f

From f73f8d7f71de2878d3f92881a5fcb8eafd78cb5f Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@suse.de>
Date: Fri, 9 Sep 2022 10:10:37 +0200
Subject: Avoid warnings with grep 3.8

GNU grep version 3.8 became more strict about needless quoting in
patterns. We have one occurrence of that in quilt, where "/"
characters are being quoted by default. There are cases where they
indeed need to be quoted (typically when used in a sed s/// command)
but most of the time they do not, and this results in the following
warning:

grep: warning: stray \ before /

So rename quote_bre() to quote_sed_re(), and introduce
quote_grep_re() which does not quote "/".

Signed-off-by: Jean Delvare <jdelvare@suse.de>
---
 quilt/diff.in             |  2 +-
 quilt/patches.in          |  2 +-
 quilt/scripts/patchfns.in | 20 +++++++++++++-------
 quilt/upgrade.in    </td></tr></table>
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<input type='hidden' name='id' value='f22c20e7ca14f79f0be5ce228f55d934cda27e04'/><select name='qt'>
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<input type='submit' value='search'/>
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<div class='content'><div id='summary'>/scripts/patchfns.in
index c2d5f9d..1bd7233 100644
--- a/quilt/scripts/patchfns.in
+++ b/quilt/scripts/patchfns.in
@@ -78,8 +78,14 @@ array_join()
 	done
 }
 
-# Quote a string for use in a basic regular expression.
-quote_bre()
+# Quote a string for use in a regular expression for a grep pattern.
+quote_grep_re()
+{
+	echo "$1" | sed -e 's:\([][^$.*\\]\):\\\1:g'
+}
+
+# Quote a string for use in a regular expression for a sed s/// command.
+quote_sed_re()
 {
 	echo "$1" | sed -e 's:\([][^$/.*\\]\):\\\1:g'
 }
@@ -215,7 +221,7 @@ patch_in_series()
 
 	if [ -e "$SERIES" ]
 	then
-		grep -q "^$(quote_bre $patch)\([ \t]\|$\)" "$SERIES"
+		grep -q "^$(quote_grep_re $patch)\([ \t]\|$\)" "$SERIES"
 	else
 		return 1
 	fi
@@ -365,7 +371,7 @@ is_applied()
 {
 	local patch=$1
 	[ -e $DB ] || return 1
-	grep -q "^$(quote_bre $patch)\$" $DB
+	grep -q "^$(quote_grep_re $patch)\$" $DB
 }
 
 applied_patches()
@@ -465,7 +471,7 @@ remove_from_db()
 	local tmpfile
 	if tmpfile=$(gen_tempfile)
 	then
-		grep -v "^$(quote_bre $patch)\$" $DB > $tmpfile
+		grep -v "^$(quote_grep_re $patch)\$" $DB > $tmpfile
 		cat $tmpfile > $DB
 		rm -f $tmpfile
 		[ -s $DB ] || rm -f $DB
@@ -520,7 +526,7 @@ find_patch()
 		fi
 
 		local patch=${1#$SUBDIR_DOWN$QUILT_PATCHES/}
-		local bre=$(quote_bre "$patch")
+		local bre=$(quote_sed_re "$patch")
 		set -- $(sed -e "/^$bre\(\|\.patch\|\.diff\?\)\(\|\.gz\|\.bz2\|\.xz\|\.lzma\|\.lz\)\([ "$'\t'"]\|$\)/!d" \
 			       -e 's/[ '$'\t''].*//' "$SERIES")
 		if [ $# -eq 1 ]
@@ -631,7 +637,7 @@ files_in_patch()
 	then
 		find "$path" -type f \
 			       -a ! -path "$(quote_glob "$path")/.timestamp" |
-		sed -e "s/$(quote_bre "$path")\///"
+		sed -e "s/$(quote_sed_re "$path")\///"
 	fi
 }
 
diff --git a/quilt/upgrade.in b/quilt/upgrade.in
index dbf7d05..866aa33 100644
--- a/quilt/upgrade.in
+++ b/quilt/upgrade.in
@@ -74,7 +74,7 @@ printf $"Converting meta-data to version %s\n" "$DB_VERSION"
 
 for patch in $(applied_patches)
 do
-	proper_name="$(grep "^$(quote_bre $patch)"'\(\|\.patch\|\.diff?\)\(\|\.gz\|\.bz2\)\([ \t]\|$\)' $SERIES)"
+	proper_name="$(grep "^$(quote_grep_re $patch)"'\(\|\.patch\|\.diff?\)\(\|\.gz\|\.bz2\)\([ \t]\|$\)' $SERIES)"
 	proper_name=${proper_name#$QUILT_PATCHES/}
 	proper_name=${proper_name%% *}
 	if [ -z "$proper_name" ]
@@ -84,7 +84,7 @@ do
 	fi
 
 	if [ "$patch" != "$proper_name" -a -d $QUILT_PC/$patch ] \
-	   && grep -q "^$(quote_bre $patch)\$" \
+	   && grep -q "^$(quote_grep_re $patch)\$" \
 		   $QUILT_PC/applied-patches
 	then
 		mv $QUILT_PC/$patch $QUILT_PC/$proper_name \
-- 
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