Try env-style settings

action.yml

@@ -103,6 +103,24 @@ runs:
   steps:
     - name: Install Nix
       shell: bash
+      env:
+        NIX_INSTALLER_MODIFY_PROFILE: ${{ inputs.modify-profile }}
+        NIX_INSTALLER_NIX_BUILD_USER_COUNT: ${{ inputs.nix-build-user-count }}
+        NIX_INSTALLER_NIX_BUILD_USER_ID_BASE: ${{ inputs.nix-build-user-base }}
+        NIX_INSTALLER_NIX_BUILD_USER_PREFIX: ${{ inputs.nix-build-user-prefix }}
+        NIX_INSTALLER_NIX_BUILD_GROUP_ID: ${{ inputs.nix-build-group-id }}
+        NIX_INSTALLER_NIX_BUILD_GROUP_NAME: ${{ inputs.nix-build-group-name }}
+        NIX_INSTALLER_ENCRYPT: ${{ inputs.mac-encrypt }}
+        NIX_INSTALLER_CASE_SENSITIVE: ${{ inputs.mac-case-sensitive }}
+        NIX_INSTALLER_VOLUME_LABEL: ${{ inputs.mac-volume-label }}
+        NIX_INSTALLER_ROOT_DISK: ${{ inputs.mac-root-disk }}
+        NIX_INSTALLER_LOGGER: ${{ inputs.logger }}
+        NIX_INSTALLER_INIT: ${{ inputs.init }}
+        NIX_INSTALLER_START_DAEMON: ${{ inputs.start-daemon }}
+        NIX_INSTALLER_LOG_DIRECTIVES: ${{ inputs.log-directives }}
+        RUST_BACKTRACE: ${{ inputs.backtrace }}
+        NIX_INSTALLER_DIAGNOSTIC_ENDPOINT: ${{ inputs.diagnostic-endpoint }}
+        NIX_INSTALLER_NO_CONFIRM: true
       run: |
         if [ -f "/nix/receipt.json" ] && [ -f "/nix/nix-installer" ]; then
           if ([ -n "${{ inputs.nix-installer-revision }}" ] || [ -n "${{ inputs.nix-installer-branch }}" ]) && [ "${{ inputs.reinstall }}" != "true" ]; then
@@ -133,36 +151,6 @@ runs:
           echo "sandbox = false" >> ${NIX_EXTRA_CONF_FILE}
         fi
 
-        if [ -n "${{ inputs.modify-profile }}" ]; then
-          export NIX_INSTALLER_MODIFY_PROFILE=${{ inputs.modify-profile }}
-          echo "Set NIX_INSTALLER_MODIFY_PROFILE=$NIX_INSTALLER_MODIFY_PROFILE"
-        fi
-
-        if [ -n "${{ inputs.nix-build-user-count }}" ]; then
-          export NIX_INSTALLER_NIX_BUILD_USER_COUNT=${{ inputs.nix-build-user-count }}
-          echo "Set NIX_INSTALLER_NIX_BUILD_USER_COUNT=$NIX_INSTALLER_NIX_BUILD_USER_COUNT"
-        fi
-
-        if [ -n "${{ inputs.nix-build-group-name }}" ]; then
-          export NIX_INSTALLER_NIX_BUILD_GROUP_NAME=${{ inputs.nix-build-group-name }}
-          echo "Set NIX_INSTALLER_NIX_BUILD_GROUP_NAME=$NIX_INSTALLER_NIX_BUILD_GROUP_NAME"
-        fi
-
-        if [ -n "${{ inputs.nix-build-group-id }}" ]; then
-          export NIX_INSTALLER_NIX_BUILD_GROUP_ID=${{ inputs.nix-build-group-id }}
-          echo "Set NIX_INSTALLER_NIX_BUILD_GROUP_ID=$NIX_INSTALLER_NIX_BUILD_GROUP_ID"
-        fi
-
-        if [ -n "${{ inputs.nix-build-user-prefix }}" ]; then
-          export NIX_INSTALLER_NIX_BUILD_USER_ID_BASE=${{ inputs.nix-build-user-prefix }}
-          echo "Set NIX_INSTALLER_NIX_BUILD_USER_ID_BASE=$NIX_INSTALLER_NIX_BUILD_USER_ID_BASE"
-        fi
-
-        if [ -n "${{ inputs.nix-build-user-base }}" ]; then
-          export NIX_INSTALLER_NIX_BUILD_USER_PREFIX=${{ inputs.nix-build-user-base }}
-          echo "Set NIX_INSTALLER_NIX_BUILD_USER_PREFIX=$NIX_INSTALLER_NIX_BUILD_USER_PREFIX"
-        fi
-
         if [ -n "${{ inputs.nix-package-url }}" ]; then
           export NIX_INSTALLER_NIX_PACKAGE_URL=${{ inputs.nix-package-url }}
           echo "Set NIX_INSTALLER_NIX_PACKAGE_URL=$NIX_INSTALLER_NIX_PACKAGE_URL"
@@ -182,26 +170,6 @@ runs:
           echo "Set NIX_INSTALLER_EXTRA_CONF=$NIX_INSTALLER_EXTRA_CONF"
         fi
 
-        if [ -n "${{ inputs.mac-encrypt }}" ]; then
-          export NIX_INSTALLER_ENCRYPT=${{ inputs.mac-encrypt }}
-          echo "Set NIX_INSTALLER_ENCRYPT=$NIX_INSTALLER_ENCRYPT"
-        fi
-
-        if [ -n "${{ inputs.mac-case-sensitive }}" ]; then
-          export NIX_INSTALLER_CASE_SENSITIVE=${{ inputs.mac-case-sensitive }}
-          echo "Set NIX_INSTALLER_CASE_SENSITIVE=$NIX_INSTALLER_CASE_SENSITIVE"
-        fi
-
-        if [ -n "${{ inputs.mac-volume-label }}" ]; then
-          export NIX_INSTALLER_VOLUME_LABEL=${{ inputs.mac-volume-label }}
-          echo "Set NIX_INSTALLER_VOLUME_LABEL=$NIX_INSTALLER_VOLUME_LABEL"
-        fi
-
-        if [ -n "${{ inputs.mac-root-disk }}" ]; then
-          export NIX_INSTALLER_ROOT_DISK=${{ inputs.mac-root-disk }}
-          echo "Set NIX_INSTALLER_ROOT_DISK=$NIX_INSTALLER_ROOT_DISK"
-        fi
-
         if [ -n "${{ inputs.nix-installer-pr }}" ] && [ -n "${{ inputs.nix-installer-tag }}" ]; then
           echo "The nix-installer-pr and nix-installer-tag options conflict, please choose one"
           exit 1
@@ -278,39 +246,6 @@ runs:
           echo "Set NIX_INSTALLER_URL=$NIX_INSTALLER_URL"
         fi
 
-        if [ -n "${{ inputs.logger }}" ]; then
-          export NIX_INSTALLER_LOGGER=${{ inputs.logger }}
-          echo "Set NIX_INSTALLER_LOGGER=$NIX_INSTALLER_LOGGER"
-        fi
-
-        if [ -n "${{ inputs.init }}" ]; then
-          export NIX_INSTALLER_INIT=${{ inputs.init }}
-          echo "Set NIX_INSTALLER_INIT=$NIX_INSTALLER_INIT"
-        fi
-
-        if [ -n "${{ inputs.start-daemon }}" ]; then
-          export NIX_INSTALLER_START_DAEMON=${{ inputs.start-daemon }}
-          echo "Set NIX_INSTALLER_START_DAEMON=$NIX_INSTALLER_START_DAEMON"
-        fi
-
-        if [ -n "${{ inputs.log-directives }}" ]; then
-          export NIX_INSTALLER_LOG_DIRECTIVES=${{ inputs.log-directives }}
-          echo "Set NIX_INSTALLER_LOG_DIRECTIVES=$NIX_INSTALLER_LOG_DIRECTIVES"
-        fi
-
-        if [ -n "${{ inputs.backtrace }}" ]; then
-          export RUST_BACKTRACE=${{ inputs.backtrace }}
-          echo "Set RUST_BACKTRACE=$RUST_BACKTRACE"
-        fi
-
-        if [ -n "${{ inputs.diagnostic-endpoint }}" ]; then
-          export NIX_INSTALLER_DIAGNOSTIC_ENDPOINT="${{ inputs.diagnostic-endpoint }}"
-          echo "Set NIX_INSTALLER_DIAGNOSTIC_ENDPOINT=$NIX_INSTALLER_DIAGNOSTIC_ENDPOINT"
-        fi
-
-        export NIX_INSTALLER_NO_CONFIRM=true
-        echo "Set NIX_INSTALLER_NO_CONFIRM=$NIX_INSTALLER_NO_CONFIRM"
-
         if [ "${RUNNER_OS}" == "Linux" ]; then
           export PLANNER="linux"
         elif [ "${RUNNER_OS}" == "macOS" ]; then