scripts: run ipkg-make-index through shellcheck

Use quotes and replace `` by $() to pass the shellcheck tests.

Signed-off-by: Paul Spooren <[email protected]>

scripts/ipkg-make-index.sh

@@ -3,25 +3,25 @@ set -e
 
 pkg_dir=$1
 
-if [ -z $pkg_dir ] || [ ! -d $pkg_dir ]; then
+if [ -z "$pkg_dir" ] || [ ! -d "$pkg_dir" ]; then
 	echo "Usage: ipkg-make-index <package_directory>" >&2
 	exit 1
 fi
 
 empty=1
 
-for pkg in `find $pkg_dir -name '*.ipk' | sort`; do
+for pkg in $(find "$pkg_dir" -name '*.ipk' | sort); do
 	empty=
 	name="${pkg##*/}"
 	name="${name%%_*}"
 	[[ "$name" = "kernel" ]] && continue
 	[[ "$name" = "libc" ]] && continue
 	echo "Generating index for package $pkg" >&2
-	file_size=$(stat -L -c%s $pkg)
-	sha256sum=$($MKHASH sha256 $pkg)
+	file_size=$(stat -L -c%s "$pkg")
+	sha256sum=$($MKHASH sha256 "$pkg")
 	# Take pains to make variable value sed-safe
-	sed_safe_pkg=`echo $pkg | sed -e 's/^\.\///g' -e 's/\\//\\\\\\//g'`
-	tar -xzOf $pkg ./control.tar.gz | tar xzOf - ./control | sed -e "s/^Description:/Filename: $sed_safe_pkg\\
+	sed_safe_pkg=$(echo "$pkg" | sed -e 's/^\.\///g' -e 's/\\//\\\\\\//g')
+	tar -xzOf "$pkg" ./control.tar.gz | tar xzOf - ./control | sed -e "s/^Description:/Filename: $sed_safe_pkg\\
 Size: $file_size\\
 SHA256sum: $sha256sum\\
 Description:/"