Add support for alternate filesystems

Fixes #100

Signed-off-by: Ethan Dye <[email protected]>

README.md

@@ -35,6 +35,7 @@ Experimental Alpine support has also been added, other distributions may work bu
     -   [Conflicts with services](#conflicts-with-services)
     -   [Swapiness on older Linux kernel versions](#swapiness-on-older-linux-kernel-versions)
     -   [Raspberry Pi 4 8GB compatibility](#raspberry-pi-4-8gb-compatibility)
+    -   [Filesystem compatibility](#filesystem-compatibility)
 7.  [Performance](#performance)
 8.  [Reference](#reference)
 
@@ -193,6 +194,13 @@ The Raspberry Pi 4 8GB model can exhibit issues with zram due to a Linux kernel
 This bug has been fixed as of Raspberry Pi Kernel version 1.20210527.
 See [raspberrypi/linux@cef3970381](https://github.com/raspberrypi/linux/commit/cef397038167ac15d085914493d6c86385773709) for more details about the issue.
 
+#### Filesystem compatibility
+
+By default zram-config should support most regular filesystems, as long as the tools are installed and available on the host system.
+In some cases, with niche filesystems some manual editing of the code may be required to enable support.
+
+Pull requests adding support for filesystems that don't work automatically are welcome.
+
 ### Performance
 
 LZO-RLE offers the best performance and is probably the best choice, and from kernel 5.1 and onward it is the default.

zram-config

@@ -104,7 +104,8 @@ createZdir() {
 	echo "createZdir: dirMountOpt - ${dirMountOpt}; dirFsType: ${dirFSType}" >> "$ZLOG"
 	createZdevice || return 1
 
-	mke2fs -v -t "$dirFSType" "/dev/zram${RAM_DEV}" &>> "$ZLOG" || return 1
+	# shellcheck disable=SC2086
+	[[ -x $(command -v mkfs.$dirFSType) ]] && mkfs.$dirFSType -v "/dev/zram${RAM_DEV}" &>> "$ZLOG" || return 1
 	mkdir -p "${ZDIR}/zram${RAM_DEV}" &>> "$ZLOG" || return 1
 	mount --verbose --types "$dirFSType" -o "$dirMountOpt" "/dev/zram${RAM_DEV}" "${ZDIR}/zram${RAM_DEV}/" &>> "$ZLOG" || return 1
 	mkdir -p "${ZDIR}/zram${RAM_DEV}/upper" "${ZDIR}/zram${RAM_DEV}/workdir" "$TARGET_DIR" &>> "$ZLOG" || return 1