#!/bin/sh
# Turn `/usr/sbin/foo` into `foo`
# Similar to `basename` but using variable substitution instead of external executable
NAME="${0##*/}"

# Detect base name
SNAP_BASE="$(sed -n '/^name:/ s/^name:\s*\(core[0-9]\{2\}\)/\1/p' /meta/snap.yaml)"

if [ "$(id -u)" != "0" ] && [ "${NAME}" = "modinfo" ]; then
    TMPDIR="$(mktemp -d)"
    ln -s "/snap/${SNAP_BASE}/current/bin/kmod" "${TMPDIR}/modinfo"
    "${TMPDIR}/modinfo" "$@"
    RET=$?
    rm -Rf "${TMPDIR}"
    exit "${RET}"
fi

if [ "${NAME}" = "lsmod" ]; then
    exec "/snap/${SNAP_BASE}/current/bin/kmod" "list" "$@"
fi

for i in "/bin/${NAME}" "/sbin/${NAME}" "/usr/bin/${NAME}" "/usr/sbin/${NAME}"; do
    [ ! -e "/var/lib/snapd/hostfs/${i}" ] && continue

    # shellcheck disable=SC2093
    exec nsenter -t 1 -m "${i}" "$@"
done

echo "Unable to find ${NAME}" 1>&2
exit 1