mkinitramfs: Add -m argument to override MODULES setting

We shouldn't need to change the system configuration to test changes to
initramfs-tools. It's possible to use the -d argument with a custom
config directory this purpose, but testing different MODULES settings is
necessary frequently enough that it deserves its own shortcut. Add a -m
argument to mkinitramfs that overrides the MODULES setting.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

mkinitramfs

@@ -21,6 +21,7 @@ Options:
   -c compress	Override COMPRESS setting in initramfs.conf.
   -d confdir	Specify an alternative configuration directory.
   -l level	Override COMPRESSLEVEL setting in initramfs.conf.
+  -m modules	Override MODULES setting in initramfs.conf.
   -k		Keep temporary directory used to make the image.
   -o outfile	Write to outfile.
   -r root	Override ROOT setting in initramfs.conf.
@@ -36,7 +37,7 @@ usage_error()
 	exit 2
 }
 
-OPTIONS=$(getopt -o c:d:hl:ko:r:v --long help -n "$0" -- "$@") || usage_error
+OPTIONS=$(getopt -o c:d:hl:m:ko:r:v --long help -n "$0" -- "$@") || usage_error
 
 eval set -- "$OPTIONS"
 
@@ -62,6 +63,10 @@ while true; do
 		compresslevel="$2"
 		shift 2
 		;;
+	-m)
+		modules="$2"
+		shift 2
+		;;
 	-o)
 		outfile="$2"
 		shift 2
@@ -257,6 +262,7 @@ if [ -d "${outfile}" ]; then
 	exit 1
 fi
 
+MODULES="${modules:-$MODULES}"
 MODULESDIR="/lib/modules/${version}"
 
 if [ ! -e "${MODULESDIR}" ]; then

mkinitramfs.8

@@ -55,6 +55,13 @@ Override the
 setting in
 .IR initramfs.conf .
 
+.TP
+\fB\-m \fI modules
+Override the
+.B MODULES
+setting in
+.IR initramfs.conf .
+
 .TP
 \fB\-o \fI outfile
 Write the image to