fix: avoid concurrent edits to the same file (#6027)

Reduce the number of processes to 1 if at least one FIX_xxxx variable is
set to true. This avoids that Parallel runs multiple processes that
might edit the same file at the same time.

lib/functions/validation.sh

@@ -7,6 +7,7 @@ function ValidateBooleanConfigurationVariables() {
   ValidateBooleanVariable "DISABLE_ERRORS" "${DISABLE_ERRORS}"
   ValidateBooleanVariable "ENABLE_GITHUB_ACTIONS_GROUP_TITLE" "${ENABLE_GITHUB_ACTIONS_GROUP_TITLE}"
   ValidateBooleanVariable "ENABLE_GITHUB_ACTIONS_STEP_SUMMARY" "${ENABLE_GITHUB_ACTIONS_STEP_SUMMARY}"
+  ValidateBooleanVariable "FIX_MODE_ENABLED" "${FIX_MODE_ENABLED}"
   ValidateBooleanVariable "FIX_MODE_TEST_CASE_RUN" "${FIX_MODE_TEST_CASE_RUN}"
   ValidateBooleanVariable "IGNORE_GENERATED_FILES" "${IGNORE_GENERATED_FILES}"
   ValidateBooleanVariable "IGNORE_GITIGNORED_FILES" "${IGNORE_GITIGNORED_FILES}"
@@ -186,6 +187,21 @@ function ValidateCheckModeAndFixModeVariables() {
   done
 }
 
+function CheckIfFixModeIsEnabled() {
+  for LANGUAGE in "${LANGUAGE_ARRAY[@]}"; do
+    local FIX_MODE_VARIABLE_NAME="FIX_${LANGUAGE}"
+    local -n FIX_MODE_REF="${FIX_MODE_VARIABLE_NAME}"
+
+    if [[ -v "${FIX_MODE_VARIABLE_NAME}" ]] &&
+      [[ "${FIX_MODE_REF:-"false"}" == "true" ]]; then
+      FIX_MODE_ENABLED="true"
+      debug "Fix mode for ${LANGUAGE} is ${FIX_MODE_REF}. Set FIX_MODE_ENABLED to ${FIX_MODE_ENABLED}"
+    fi
+    unset -n FIX_MODE_REF
+  done
+  ValidateBooleanVariable "FIX_MODE_ENABLED" "${FIX_MODE_ENABLED}"
+}
+
 function CheckIfGitBranchExists() {
   local BRANCH_NAME="${1}"
   debug "Check if the ${BRANCH_NAME} branch exists in ${GITHUB_WORKSPACE}"

lib/linter.sh

@@ -144,6 +144,8 @@ export SUPER_LINTER_PRIVATE_OUTPUT_DIRECTORY_PATH
 debug "Super-linter private output directory path: ${SUPER_LINTER_PRIVATE_OUTPUT_DIRECTORY_PATH}"
 mkdir -p "${SUPER_LINTER_PRIVATE_OUTPUT_DIRECTORY_PATH}"
 
+FIX_MODE_ENABLED="false"
+
 ValidateBooleanConfigurationVariables
 
 ###########
@@ -819,8 +821,19 @@ declare PARALLEL_RESULTS_FILE_PATH
 PARALLEL_RESULTS_FILE_PATH="${SUPER_LINTER_PRIVATE_OUTPUT_DIRECTORY_PATH}/super-linter-results.json"
 debug "PARALLEL_RESULTS_FILE_PATH: ${PARALLEL_RESULTS_FILE_PATH}"
 
+declare -i LINTING_MAX_PROCS
+LINTING_MAX_PROCS=$(nproc)
+
+CheckIfFixModeIsEnabled
+if [[ "${FIX_MODE_ENABLED}" == "true" ]]; then
+  # This slows down the fix process, but avoids that linters that work on the same
+  # types of files try opening the same file at the same time
+  LINTING_MAX_PROCS=1
+  debug "Set LINTING_MAX_PROCS to ${LINTING_MAX_PROCS} to avoid that linters and formatters edit the same file at the same time."
+fi
+
 declare -a PARALLEL_COMMAND
-PARALLEL_COMMAND=(parallel --will-cite --keep-order --max-procs "$(($(nproc) * 1))" --xargs --results "${PARALLEL_RESULTS_FILE_PATH}")
+PARALLEL_COMMAND=(parallel --will-cite --keep-order --max-procs "$((LINTING_MAX_PROCS))" --xargs --results "${PARALLEL_RESULTS_FILE_PATH}")
 
 # Run one LANGUAGE per process. Each of these processes will run more processees in parellel if supported
 PARALLEL_COMMAND+=(--max-lines 1)

test/lib/validationTest.sh

@@ -499,6 +499,32 @@ function ValidateCheckModeAndFixModeVariablesTest() {
   notice "${FUNCTION_NAME} PASS"
 }
 
+CheckIfFixModeIsEnabledTest() {
+  # shellcheck disable=SC2034
+  LANGUAGE_ARRAY=('A')
+
+  FIX_MODE_ENABLED="false"
+  FIX_A="true"
+  CheckIfFixModeIsEnabled
+  EXPECTED_FIX_MODE_ENABLED="true"
+  if [[ "${FIX_MODE_ENABLED}" == "${EXPECTED_FIX_MODE_ENABLED}" ]]; then
+    debug "FIX_MODE_ENABLED variable has the expected value: ${FIX_MODE_ENABLED}"
+  else
+    fatal "FIX_MODE_ENABLED (${FIX_MODE_ENABLED}) doesn't match with the expected value: ${EXPECTED_FIX_MODE_ENABLED}"
+  fi
+
+  FIX_MODE_ENABLED="false"
+  FIX_A="false"
+  CheckIfFixModeIsEnabled
+  EXPECTED_FIX_MODE_ENABLED="false"
+  if [[ "${FIX_MODE_ENABLED}" == "${EXPECTED_FIX_MODE_ENABLED}" ]]; then
+    debug "FIX_MODE_ENABLED variable has the expected value: ${FIX_MODE_ENABLED}"
+  else
+    fatal "FIX_MODE_ENABLED (${FIX_MODE_ENABLED}) doesn't match with the expected value: ${EXPECTED_FIX_MODE_ENABLED}"
+  fi
+
+}
+
 IsUnsignedIntegerSuccessTest
 IsUnsignedIntegerFailureTest
 ValidateDeprecatedVariablesTest
@@ -509,3 +535,4 @@ ValidateAnsibleDirectoryTest
 ValidateValidationVariablesTest
 ValidationVariablesExportTest
 ValidateCheckModeAndFixModeVariablesTest
+CheckIfFixModeIsEnabledTest