First pass at a script

Author: chessturo

Microsoft/scripts/gen_modules_vhdx.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -ueo pipefail
+
+if [ $# -ne 2 ] || [ ! -d $1 ]; then
+	printf "Usage ./$0 <modules dir> <output file>" 1>&2
+	exit 1
+fi
+
+if [ -e $2 ]; then
+	printf "Refusing to overwrite existing file $2" 1>&2
+	exit 2
+fi
+
+
+# Calculate modules size (+ 256MiB for slack)
+modules_size=$(du -bs "$1" | awk '{print $1;}')
+modules_size=$((modules_size + (256*(1<<20))))
+
+# Create our scratch directory
+tmp_dir=$(mktemp -d)
+
+# Create a blank image file of the right size
+dd if=/dev/zero of="$tmp_dir/modules.img" bs=1024 count=$((modules_size / 1024))
+
+# Set up fs and mount
+lo_dev=$(sudo losetup --find --show "$tmp_dir/modules.img")
+sudo mkfs -t ext4 "$lo_dev"
+mkdir "$tmp_dir/modules_img"
+sudo mount "$lo_dev" "$tmp_dir/modules_img"
+sudo chmod a+rw "$tmp_dir/modules_img"
+
+# Copy over the contents of $1
+cp -r "$1"/* "$tmp_dir/modules_img"
+sudo umount "$tmp_dir/modules_img"
+
+# Do the final conversion
+qemu-img convert -O vhdx "$tmp_dir/modules.img" "$2"
+