Fix shellcheck complains in CI scripts

.gitlab/ci/build-host.sh:
Change the readonly TMPDIR variable to a global tmpdir variable and set it in the `init()` function.

.gitlab/ci/build-inside-vm.sh:
Change assigning the readonly tmpdir variable directly to assigning it after declaring it.
Change `cleanup()` and `create_zsync_delta()` to use bash-style statements and also check whether SUDO_GID is set before
using it.

2 files changed, 11 insertions, 8 deletions

diff --git a/.gitlab/ci/build-host.sh b/.gitlab/ci/build-host.sh
index 1849420..be688bb 100755
--- a/.gitlab/ci/build-host.sh
+++ b/.gitlab/ci/build-host.sh
@@ -6,18 +6,20 @@
 set -o nounset -o errexit
 readonly MIRROR="https://mirror.pkgbuild.com"
 
+tmpdir=""
+
 function init() {
   readonly ORIG_PWD="${PWD}"
   readonly OUTPUT="${PWD}/output"
-  readonly TMPDIR="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
-  mkdir -p "${OUTPUT}" "${TMPDIR}"
+  tmpdir="$(mktemp --dry-run --directory --tmpdir="${PWD}/tmp")"
+  mkdir -p "${OUTPUT}" "${tmpdir}"
 
-  cd "${TMPDIR}"
+  cd "${tmpdir}"
 }
 
 # Do some cleanup when the script exits
 function cleanup() {
-  rm -rf -- "${TMPDIR}"
+  rm -rf -- "${tmpdir}"
   jobs -p | xargs --no-run-if-empty kill
 }
 trap cleanup EXIT
@@ -146,7 +148,7 @@ function main() {
   ## Start build and copy output to local disk
   send "bash -x ./.gitlab/ci/build-inside-vm.sh ${PROFILE}\n "
   expect "# " 2400 # mksquashfs can take a very long time
-  send "cp -r --preserve=mode,timestamps -- output /mnt/project/tmp/$(basename "${TMPDIR}")/\n"
+  send "cp -r --preserve=mode,timestamps -- output /mnt/project/tmp/$(basename "${tmpdir}")/\n"
   expect "# " 60
   mv output/* "${OUTPUT}/"
 
diff --git a/.gitlab/ci/build-inside-vm.sh b/.gitlab/ci/build-inside-vm.sh
index 151cc13..8e433b1 100755
--- a/.gitlab/ci/build-inside-vm.sh
+++ b/.gitlab/ci/build-inside-vm.sh
@@ -6,7 +6,8 @@
 
 readonly orig_pwd="${PWD}"
 readonly output="${orig_pwd}/output"
-readonly tmpdir="$(mktemp --dry-run --directory --tmpdir="${orig_pwd}/tmp")"
+tmpdir=""
+tmpdir="$(mktemp --dry-run --directory --tmpdir="${orig_pwd}/tmp")"
 
 cleanup() {
   # clean up temporary directories
@@ -21,7 +22,7 @@ create_checksums() {
   sha256sum "${1}" >"${1}.sha256"
   sha512sum "${1}" >"${1}.sha512"
   b2sum "${1}" >"${1}.b2"
-  if [ -n "${SUDO_UID:-}" ]; then
+  if [[ -n "${SUDO_UID:-}" ]] && [[ -n "${SUDO_GID:-}" ]]; then
     chown "${SUDO_UID}:${SUDO_GID}" "${1}"{,.b2,.sha{256,512}}
   fi
 }
@@ -30,7 +31,7 @@ create_zsync_delta() {
   # create a zsync control file for a file
   # $1: a file
   zsyncmake -C -u "${1##*/}" -o "${1}".zsync "${1}"
-  if [ -n "${SUDO_UID:-}" ]; then
+  if [[ -n "${SUDO_UID:-}" ]] && [[ -n "${SUDO_GID:-}" ]]; then
     chown "${SUDO_UID}:${SUDO_GID}" "${1}".zsync
   fi
 }