[PATCH 10/11] ci: pytest: Centralize feature discovery to a separate step

[Tobias Waldekranz <tobias@waldekranz.com>]

This avoids the need for each step to (re)discover features. Start off
by only checking for 'testfs', but this can easily be expanded in the
future.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
---
 .github/workflows/test-labgrid-pytest.yml | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/test-labgrid-pytest.yml b/.github/workflows/test-labgrid-pytest.yml
index adec3defc1..6918ea1b98 100644
--- a/.github/workflows/test-labgrid-pytest.yml
+++ b/.github/workflows/test-labgrid-pytest.yml
@@ -64,6 +64,17 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
+    - name: Determine used features
+      id: used-features
+      run: |
+        for i in ${{matrix.lgenv}}; do
+          if grep -wq 'testfs' "$i"; then
+            echo "testfs=true" >>$GITHUB_OUTPUT
+            exit
+          fi
+        done
+        echo "testfs=false" >> $GITHUB_OUTPUT
+
     - name: Build
       id: build
       run: |
@@ -83,17 +94,14 @@ jobs:
         fi
 
     - name: Populate testfs
+      if: steps.used-features.outputs.testfs == 'true'
       run: |
         export KBUILD_OUTPUT=build-${{matrix.arch}}-${{matrix.defconfig}}
         export KBUILD_DEFCONFIG=${{matrix.defconfig}}
 
-        for i in ${{matrix.lgenv}}; do
-          grep -wq 'testfs' "$i" || continue
-
-          # Just use already built dtc
-          export PATH="$PATH:${KBUILD_OUTPUT}/scripts/dtc/"
-          exec scripts/generate_testfs.sh
-        done
+        # Just use already built dtc
+        export PATH="$PATH:${KBUILD_OUTPUT}/scripts/dtc/"
+        exec scripts/generate_testfs.sh
 
     - name: labgrid-pytest
       if: steps.build.outcome == 'success'
-- 
2.43.0