Merge branch 'fix-shellcheck' into 'master'

Fix shellcheck complains due to new version

See merge request archlinux/arch-boxes!169

build-host.sh

@@ -9,7 +9,9 @@ readonly MIRROR="https://mirror.pkgbuild.com"
 function init() {
   readonly ORIG_PWD="${PWD}"
   readonly OUTPUT="${PWD}/output"
-  readonly TMPDIR="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
+  local tmpdir
+  tmpdir="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
+  readonly TMPDIR="${tmpdir}"
   mkdir -p "${OUTPUT}" "${TMPDIR}"
 
   cd "${TMPDIR}"

build-inside-vm.sh

@@ -13,9 +13,11 @@ readonly MIRROR='https://mirror.pkgbuild.com/$repo/os/$arch'
 function init() {
   readonly ORIG_PWD="${PWD}"
   readonly OUTPUT="${PWD}/output"
-  readonly TMPDIR="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
+  local tmpdir
+  tmpdir="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
+  readonly TMPDIR="${tmpdir}"
   mkdir -p "${OUTPUT}" "${TMPDIR}"
-  if [ -n "${SUDO_UID:-}" ]; then
+  if [ -n "${SUDO_UID:-}" ] && [[ -n "${SUDO_GID:-}" ]]; then
     chown "${SUDO_UID}:${SUDO_GID}" "${OUTPUT}" "${TMPDIR}"
   fi
   cd "${TMPDIR}"