Update dracut-catimages to make it much more robust in the face of

image filenames with spaces, carriage returns, and other such nasty
characters in them.  Bash arrays are very useful for these sorts of things.

dracut-catimages

@@ -70,7 +70,7 @@ done
 
 outfile=$1; shift
 
-if [ -z "$outfile" ]; then
+if [[ -z $outfile ]]; then
     derror "No output file specified."
     usage
     exit 1
@@ -78,45 +78,47 @@ fi
 
 baseimage=$1; shift
 
-if [ -z "$baseimage" ]; then
+if [[ -z $baseimage ]]; then
     derror "No base image specified."
     usage
     exit 1
 fi
 
-if [ -f $outfile -a -z "$force" ]; then
+if [[ -f $outfile && ! $force ]]; then
     derror "Will not override existing initramfs ($outfile) without --force"
     exit 1
 fi
 
-if [ -z "$no_imagedir" -a ! -d "$imagedir" ]; then
+if [[ ! $no_imagedir && ! -d $imagedir ]]; then
     derror "Image directory $overlay is not a directory"
     exit 1
 fi
 
-if [ -z "$no_overlay" -a ! -d "$overlay" ]; then
+if [[ ! $no_overlay && ! -d $overlay ]]; then
     derror "Overlay $overlay is not a directory"
     exit 1
 fi
 
-if [ -z "$no_overlay" ]; then
+if [[ ! $no_overlay ]]; then
     ofile="$imagedir/90-overlay.img"
     dinfo "Creating image $ofile from directory $overlay"
     ( cd "$overlay"; find . |cpio --quiet -H newc -o  |gzip -9 > "$ofile"; )
 fi
 
-if [ -z "$no_imagedir" ]; then
-    images=$(for i in $imagedir/*.img;do [ -f $i ] || continue; echo $i; done)
+if [[ ! $no_imagedir ]]; then
+    for i in "$imagedir/"*.img; do
+	[[ -f $i ]] && images+=("$i")
+    done
 fi
 
-images="$images $@"
+images+=($@)
 
 dinfo "Using base image $baseimage"
-cat $baseimage > $outfile
+cat "$baseimage" > "$outfile"
 
-for i in $images; do 
+for i in "${images[@]}"; do 
     dinfo "Appending $i"
-    cat $i >> $outfile
+    cat "$i" >> "$outfile"
 done
 
 dinfo "Created $outfile"