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# Helper functions related to storage backends.
# Whether a storage backend is available
storage_backend_available() {
# shellcheck disable=2039,3043
local backends
backends="$(available_storage_backends)"
if [ "${backends#*"$1"}" != "$backends" ]; then
true
return
elif [ "${1}" = "cephfs" ] && [ "${backends#*"ceph"}" != "$backends" ] && [ -n "${INCUS_CEPH_CEPHFS:-}" ]; then
true
return
fi
false
}
# Choose a random available backend, excluding INCUS_BACKEND
random_storage_backend() {
# shellcheck disable=2046
shuf -e $(available_storage_backends) | head -n 1
}
# Return the storage backend being used by an incus instance
storage_backend() {
cat "$1/incus.backend"
}
# Return a list of available storage backends
available_storage_backends() {
# shellcheck disable=2039,3043
local backend backends storage_backends
backends="dir" # always available
storage_backends="btrfs lvm zfs"
if [ -n "${INCUS_CEPH_CLUSTER:-}" ]; then
storage_backends="${storage_backends} ceph"
fi
for backend in $storage_backends; do
if command -v "$backend" > /dev/null 2>&1; then
backends="$backends $backend"
fi
done
echo "$backends"
}
import_storage_backends() {
# shellcheck disable=SC2039,3043
local backend
for backend in $(available_storage_backends); do
# shellcheck disable=SC1090
. "backends/${backend}.sh"
done
}
configure_loop_device() {
# shellcheck disable=SC2039,3043
local lv_loop_file pvloopdev
# shellcheck disable=SC2153
lv_loop_file=$(mktemp -p "${TEST_DIR}" XXXX.img)
truncate -s 10G "${lv_loop_file}"
pvloopdev=$(losetup --show -f "${lv_loop_file}")
if [ ! -e "${pvloopdev}" ]; then
echo "failed to setup loop"
false
fi
# shellcheck disable=SC2153
echo "${pvloopdev}" >> "${TEST_DIR}/loops"
# The following code enables to return a value from a shell function by
# calling the function as: fun VAR1
# shellcheck disable=2039,3043
local __tmp1="${1}"
# shellcheck disable=2039,3043
local res1="${lv_loop_file}"
if [ "${__tmp1}" ]; then
eval "${__tmp1}='${res1}'"
fi
# shellcheck disable=2039,3043
local __tmp2="${2}"
# shellcheck disable=2039,3043
local res2="${pvloopdev}"
if [ "${__tmp2}" ]; then
eval "${__tmp2}='${res2}'"
fi
}
deconfigure_loop_device() {
# shellcheck disable=SC2039,3043
local lv_loop_file loopdev success
lv_loop_file="${1}"
loopdev="${2}"
success=0
for _ in $(seq 20); do
if ! losetup "${loopdev}"; then
success=1
break
fi
if losetup -d "${loopdev}"; then
success=1
break
fi
sleep 0.1
done
if [ "${success}" = "0" ]; then
echo "Failed to tear down loop device"
return 1
fi
rm -f "${lv_loop_file}"
sed -i "\\|^${loopdev}|d" "${TEST_DIR}/loops"
}
umount_loops() {
# shellcheck disable=SC2039,3043
local line test_dir
test_dir="$1"
if [ -f "${test_dir}/loops" ]; then
while read -r line; do
losetup -d "${line}" || true
done < "${test_dir}/loops"
fi
}
|
