tests: partitioning: Verify run action postprocess cwd

Extend the partitioning test to enforce the expected working directory
behaviour for postprocess actions. When a recipe is executed with an
explicit --artifactdir, postprocess run actions should execute with:

 * cwd == $ARTIFACTDIR
 * $ARTIFACTDIR != $RECIPEDIR

The test now checks all three conditions:
 * test.img exists in the current directory,
 * the working directory is $ARTIFACTDIR,
 * that $ARTIFACTDIR is different from $RECIPEDIR.

This ensures correct isolation between recipe sources and build
artifacts and catches regressions where postprocess commands
incorrectly inherit the recipe directory as their working directory.

Signed-off-by: Christopher Obbard <[email protected]>

Author: obbardc

.github/workflows/ci.yaml

@@ -197,7 +197,7 @@ jobs:
         test:
           - { name: "recipes", case: "recipes" }
           - { name: "templating", case: "templating", variables: " -t escaped:\\$ba\\'d\\$gers\\ snakes" }
-          - { name: "partitioning", case: "partitioning" }
+          - { name: "partitioning", case: "partitioning", variables: "--artifactdir=/scratch" }
           - { name: "msdos partitioning", case: "msdos" }
           - { name: "debian (amd64, debootstrap)", case: "debian", variables: "-t architecture:amd64" }
           - { name: "debian (amd64, mmdebstrap)", case: "debian", variables: "-t architecture:amd64 -t tool:mmdebstrap" }

tests/partitioning/test.yaml

@@ -60,3 +60,19 @@ actions:
       bash -c 'diff -u \
         <(jq "del(.partitiontable.partitions[].uuid)" "${RECIPEDIR}/expected.json") \
         <(jq "del(.partitiontable.partitions[].uuid)" "${RECIPEDIR}/actual.json")'
+
+  # Verify that postprocess commands have cwd set to artifact directory
+  # by ensuring:
+  #  - test.img exists in the current directory,
+  #  - the working directory is $ARTIFACTDIR,
+  #  - that $ARTIFACTDIR is different from $RECIPEDIR.
+  #
+  # This test is run with --artifactdir=/scratch so the artifact directory
+  # is different from the recipe directory.
+  - action: run
+    postprocess: true
+    description: Verify postprocess cwd is artifact directory
+    command: |
+      test -f test.img
+      test "${ARTIFACTDIR}" = "$(pwd)"
+      test "${ARTIFACTDIR}" != "${RECIPEDIR}"