[PATCH 1/1] testsuite: add parameter to emit bitbake dependency graph

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

When running with this avocado parameter, bitbake is called with "-g"
prior to executing the build. By that, a dependency graph of what
bitbake will execute is dumped that tremendously helps in identifying
what we test. This further helps developers to strip down tests to the
features that should be tested by locating unwanted tasks that are
pulled in via transitive dependencies.

The feature is modeled as a test function itself, so it can later be
extended to write parser-only tests or graph analysis tests.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 testsuite/README.md |  2 ++
 testsuite/cibase.py | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/testsuite/README.md b/testsuite/README.md
index 3b2be5af..b1a75b04 100644
--- a/testsuite/README.md
+++ b/testsuite/README.md
@@ -27,6 +27,8 @@ $ avocado run ../testsuite/citest.py -t dev --max-parallel-tasks=1
 
 ```
 $ avocado run ../testsuite/citest.py -t single --max-parallel-tasks=1 -p machine=qemuamd64 -p distro=bullseye
+# Generate bitbake dependency graph as well
+$ avocado run ../testsuite/citest.py -t single --max-parallel-tasks=1 -p machine=qemuamd64 -p distro=bullseye -p depgraph=1
 ```
 
 ## Fast build test
diff --git a/testsuite/cibase.py b/testsuite/cibase.py
index 0a006a21..70964c6d 100755
--- a/testsuite/cibase.py
+++ b/testsuite/cibase.py
@@ -17,10 +17,25 @@ class CIBaseTest(CIBuilder):
     def perform_build_test(self, targets, should_fail=False, **kwargs):
         self.configure(**kwargs)
 
+        if bool(int(self.params.get('depgraph', default=0))):
+            self.generate_dependency_graph(targets)
+
         self.log.info("Starting build...")
 
         self.bitbake(targets, should_fail=should_fail, **kwargs)
 
+    def generate_dependency_graph(self, targets, should_fail=False, **kwargs):
+        """Debug helper to better understand test task graphs."""
+        self.configure(**kwargs)
+
+        self.log.info("Generating dependency graph...")
+
+        bb_args = ["-g"]
+        bb_args.extend(self.bitbake_args or [])
+        self.bitbake(targets, should_fail=should_fail,
+                     bitbake_args=bb_args, **kwargs)
+        self.move_in_build_dir('task-depends.dot', f"dep-{self.name}.dot")
+
     def perform_wic_partition_test(self, targets, wic_deploy_parts, **kwargs):
         self.configure(wic_deploy_parts=wic_deploy_parts, **kwargs)
         self.bitbake(targets, **kwargs)
-- 
2.51.0

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