By default use mksquashfs/mkdwarfs provided by the project

No reason not use them, this will allow people to build Conty even on systems that do not have mksquashfs or mkdwarfs.
For those who prefer to use their system-wide programs, there is USE_SYS_UTILS variable.

create-conty.sh

@@ -4,17 +4,23 @@
 
 script_dir="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
 
+# Enable this variable to use the system-wide mksquashfs/mkdwarfs instead
+# of those provided by the Conty project
+USE_SYS_UTILS=0
+
 # Supported compression algorithms: lz4, zstd, gzip, xz, lzo
 # These are the algorithms supported by the integrated squashfuse
 # However, your squashfs-tools (mksquashfs) may not support some of them
-squashfs_compressor="lz4"
+squashfs_compressor="zstd"
-squashfs_compressor_arguments=(-b 256K -comp "${squashfs_compressor}" -Xhc)
+squashfs_compressor_arguments=(-b 1M -comp ${squashfs_compressor} -Xcompression-level 19)
 
-# Uncomment these two lines if you want better compression and your mksquashfs supports zstd
+# Uncomment these variables if your mksquashfs does not support zstd or
-#squashfs_compressor="zstd"
+# if you want faster compression/decompression (at the cost of compression ratio)
-#squashfs_compressor_arguments=(-b 1M -comp ${squashfs_compressor} -Xcompression-level 19)
+#squashfs_compressor="lz4"
+#squashfs_compressor_arguments=(-b 256K -comp "${squashfs_compressor}" -Xhc)
 
-# Use dwarfs instead of squashfs
+# Use DwarFS instead of SquashFS
+# If you enable this, don't forget to change utils_size in conty-start.sh
 dwarfs="false"
 dwarfs_compressor_arguments=(-l7 -C zstd:level=19 --metadata-compression null \
                             -S 22 -B 2 --order nilsimsa:255:60000:60000 \
@@ -28,12 +34,27 @@ image_path="${script_dir}"/image
 
 bootstrap="${script_dir}"/root.x86_64
 
+launch_wrapper () {
+	if [ "${USE_SYS_UTILS}" != 0 ]; then
+		if ! command -v "${1}" 1>/dev/null; then
+			echo "Please install $(echo "${1}" | tail -c +3) and run the script again"
+			exit 1
+		fi
+
+		"$@"
+	else
+		"${script_dir}"/utils/ld-linux-x86-64.so.2 --library-path "${script_dir}"/utils "${script_dir}"/utils/"$@"
+	fi
+}
+
 cd "${script_dir}" || exit 1
 
 if [ "${dwarfs}" = "true" ]; then
 	utils="utils_dwarfs.tar.gz"
+	compressor_command=(mkdwarfs -i "${bootstrap}" -o "${image_path}" "${dwarfs_compressor_arguments[@]}")
 else
 	utils="utils.tar.gz"
+	compressor_command=(mksquashfs "${bootstrap}" "${image_path}" "${squashfs_compressor_arguments[@]}")
 fi
 
 if [ ! -f "${utils}" ] || [ "$(wc -c < "${utils}")" -lt 1000 ]; then
@@ -46,8 +67,20 @@ if [ ! -f conty-start.sh ]; then
 	exit 1
 fi
 
+rm -rf utils
+tar -zxf "${utils}"
+
+if [ $? != 0 ]; then
+	echo "Something is wrong with ${utils}"
+	exit 1
+fi
+
+if [ "${USE_SYS_UTILS}" != 0 ]; then
+	rm -rf utils
+fi
+
 # Check if selected compression algorithm is supported by mksquashfs
-if [ "${dwarfs}" != "true" ] && command -v grep 1>/dev/null; then
+if [ "${USE_SYS_UTILS}" != 0 ] && [ "${dwarfs}" != "true" ] && command -v grep 1>/dev/null; then
 	# mksquashfs writes its output to stderr instead of stdout
 	mksquashfs &>mksquashfs_out.txt
 
@@ -76,21 +109,7 @@ if [ ! -f "${image_path}" ] || [ "${use_existing_image}" != "true" ]; then
 	fi
 
 	rm -f "${image_path}"
-	if [ "${dwarfs}" = "true" ]; then
+	launch_wrapper "${compressor_command[@]}"
-		if ! command -v mkdwarfs 1>/dev/null; then
-			echo "Please install dwarfs and run the script again"
-			exit 1
-		fi
-
-		mkdwarfs -i "${bootstrap}" -o "${image_path}" "${dwarfs_compressor_arguments[@]}"
-	else
-		if ! command -v mksquashfs 1>/dev/null; then
-			echo "Please install squashfs-tools and run the script again"
-			exit 1
-		fi
-
-		mksquashfs "${bootstrap}" "${image_path}" "${squashfs_compressor_arguments[@]}"
-	fi
 fi
 
 # Combine the files into a single executable using cat