[PATCH] start_vm.py: support running images built with kas on host

[Uladzimir Bely <ubely@ilbers.de>]

Script start_vm.py internally calls bitbake (bb.tinfoil) to set
some qemu parameters from the build environment. If the image
was build in kas, build/conf/bblayers.conf includes path that don't
fit host machine.

Also, current implementation relies on appropriate BBMULTICONFIG
value set in local.conf.

The patch adds workarounds that cover both cases mentioned above.

Configuring and building the image:

```
./kas/kas-container menu
./kas/kas-container build
```

Running the image with start_vm.py:

```
. isar-init-build-env
../testsuite/start_vm.py -a amd64 -d bookworm -i isar-image-base
```

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 kas/isar.yaml         |  4 ++++
 testsuite/start_vm.py | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/kas/isar.yaml b/kas/isar.yaml
index 16ce8b42..d15bdbe1 100644
--- a/kas/isar.yaml
+++ b/kas/isar.yaml
@@ -17,3 +17,7 @@ bblayers_conf_header:
   standard: |
     BBPATH = "${TOPDIR}"
     BBFILES ?= ""
+
+local_conf_header:
+  bbmulticonfig: |
+    BBMULTICONFIG += "${MACHINE}-${BASE_DISTRO_CODENAME}"
diff --git a/testsuite/start_vm.py b/testsuite/start_vm.py
index 0b9a52d6..f39e53a1 100755
--- a/testsuite/start_vm.py
+++ b/testsuite/start_vm.py
@@ -135,7 +135,17 @@ def sb_cleanup():
     os.remove(os.path.basename(OVMF_VARS_PATH))
 
 
+def kas_paths_workaround():
+    # "repo" simlink pointing to the isar dir makes kas-generated
+    # ${TOPDIR}/../repo/ paths in local.conf work outside of kas container
+    isar_dir = os.path.realpath(f'{os.path.dirname(__file__)}/..')
+    if not os.path.exists(f'{isar_dir}/repo'):
+        os.symlink('.', f'{isar_dir}/repo')
+
+
 def start_qemu(arch, build, distro, image, out, pid, enforce_pcbios):
+    kas_paths_workaround()
+
     cmdline, vm_ctx = format_qemu_cmdline(
         arch, build, distro, image, out, pid, enforce_pcbios
     )
-- 
2.45.2

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