Use subdirs for before and after

Author: arjan-bal

.github/workflows/deps.yml

@@ -31,20 +31,26 @@ jobs:
       - name: Compare dependencies
         run: |
           set -eux
-          BASE_REF="${GITHUB_BASE_REF:-master}"
-          # Suffixes passed to mktemp must not contain "/".
-          BEFORE_SUFFIX="${BASE_REF//\//_}"
-          AFTER_SUFFIX="${GITHUB_HEAD_REF//\//_}"
+          TEMP_DIR="$(mktemp -d)"
+          # GITHUB_BASE_REF is set when the job is triggered by a PR.
+          TARGET_REF="${GITHUB_BASE_REF:-master}"
+          # GITHUB_HEAD_REF is set when the job is triggered by a PR.
+          SOURCE_REF="${GITHUB_HEAD_REF:-source}"
 
-          BEFORE="$(mktemp -d --suffix="-${BEFORE_SUFFIX}")"
-          AFTER="$(mktemp -d --suffix="-${AFTER_SUFFIX}")"
+          # Replace special characters in the branch names.
+          BEFORE_DIR_NAME="$(echo "${SOURCE_REF}" | sed 's/[^a-zA-Z0-9._-]/_/g')"
+          AFTER_DIR_NAME="$(echo "${TARGET_REF}" | sed 's/[^a-zA-Z0-9._-]/_/g')"
 
-          scripts/gen-deps.sh "${AFTER}"
-          # GITHUB_BASE_REF is set when the job is triggered by a PR.
-          git checkout origin/"${BASE_REF}"
-          scripts/gen-deps.sh "${BEFORE}"
+
+          mkdir "${TEMP_DIR}/${AFTER_DIR_NAME}"
+          scripts/gen-deps.sh "${TEMP_DIR}/${AFTER_DIR_NAME}"
+
+          git checkout "origin/${TARGET_REF}"
+          mkdir "${TEMP_DIR}/${BEFORE_DIR_NAME}"
+          scripts/gen-deps.sh "${TEMP_DIR}/${BEFORE_DIR_NAME}"
 
           echo "Comparing dependencies..."
+          cd "${TEMP_DIR}"
           # Run grep in a sub-shell since bash does not support ! in the middle of a pipe
-          diff -u0 -r "${BEFORE}" "${AFTER}" | bash -c '! grep -v "@@"'
+          diff -u0 -r "./${BEFORE_DIR_NAME}" "./${AFTER_DIR_NAME}" | bash -c '! grep -v "@@"'
           echo "No changes detected."