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#!/usr/bin/env bash
set -euxo pipefail
usage()
{
echo "Usage: $0 create PARENT_TMPDIR UID GID"
echo " $0 destroy PARENT_TMPDIR"
}
create-tinyfs()
{
local tmpdir="$1" uid="$2" gid="$3" origdir
origdir="$(pwd)"
cd -P "$tmpdir"
dd if=/dev/zero of=tinyfs.img bs=10MB count=1
chmod 600 tinyfs.img
mke2fs -F tinyfs.img
mkdir tinyfs
mount -oloop tinyfs.img tinyfs
chown "$uid:$gid" tinyfs
cd "$origdir"
}
destroy-tinyfs()
{
local tmpdir="$1"
umount -l -d "$tmpdir"/tinyfs
rm -f "$tmpdir"/tinyfs.img
}
set -x
case "$1" in
create)
shift
if [ "$#" -ne 3 ]; then
usage 1>&2
exit 1
fi
create-tinyfs "$@"
;;
destroy)
shift
if [ "$#" -ne 1 ]; then
usage 1>&2
exit 1
fi
destroy-tinyfs "$1"
;;
*)
usage 1>&2
exit 1
esac
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