[PATCH 2/9] isar-ci-ssh-setup: avoid abs path in signatures

[chris.larson@siemens.com]

From: Christopher Larson <chris.larson@siemens.com>

TESTSUITEDIR is a full absolute path to the testsuite directory in isar,
as set in the environment by the build setup scripts. This is referenced
in the install task, which prevents shared state reuse for this package.
While this is predominently used in CI, it's still a good idea to avoid
absolute paths in signatures, so we can reuse shared state for this
package in other contexts.

Rather than excluding the TESTSUITEDIR from signatures entirely with
vardepsexclude, we can retain some information about the path by using
os.path.relpath to make it relative to the top directory of the build.
This is the same approach used by isar-bootstrap for the keys, and the
vardepvalue approach is also used elsewhere for layer paths.

Submitted at https://groups.google.com/g/isar-users/c/2NB-PXyswq8/m/oOIB_KxTAQAJ.

Signed-off-by: Christopher Larson <chris.larson@siemens.com>
---
 .../recipes-ci/isar-ci-ssh-setup/isar-ci-ssh-setup_0.1.bb      | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta-test/recipes-ci/isar-ci-ssh-setup/isar-ci-ssh-setup_0.1.bb b/meta-test/recipes-ci/isar-ci-ssh-setup/isar-ci-ssh-setup_0.1.bb
index 4693f647..89100444 100644
--- a/meta-test/recipes-ci/isar-ci-ssh-setup/isar-ci-ssh-setup_0.1.bb
+++ b/meta-test/recipes-ci/isar-ci-ssh-setup/isar-ci-ssh-setup_0.1.bb
@@ -13,6 +13,9 @@ DEBIAN_DEPENDS = "adduser, apt (>= 0.4.2), network-manager, sshd-regen-keys"
 
 inherit dpkg-raw
 
+# Avoid absolute paths in signatures which prevent shared state reuse
+TESTSUITEDIR[vardepvalue] = "${@os.path.relpath('${TESTSUITEDIR}', '${TOPDIR}')}"
+
 do_install() {
     # Install authorized SSH keys
     install -v -d ${D}/var/lib/isar-ci/.ssh/
-- 
2.39.2