[PATCH v2 2/2] ci: add ci_setup script to ease provisioning of the test container

["'Cedric Hombourger' via isar-users" <isar-users@googlegroups.com>]

Our CONTRIBUTING guide lists several manual steps to be done prior
to running avocado: introduce a ci_setup script that we will use
as entry-point to the kas container. This will help developers
reproduce the CI environment they should use to validate their
changes prior to submitting them.

Signed-off-by: Cedric Hombourger <cedric.hombourger@siemens.com>
---
 CONTRIBUTING.md     |  9 +--------
 scripts/ci_setup.sh | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 8 deletions(-)
 create mode 100755 scripts/ci_setup.sh

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 06f09aed..b4fa64ff 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -98,19 +98,12 @@ Plan merges to `master` so that both fit the two-week window; short extensions s
           meta:
           meta-isar:
     EOF
-    kas/kas-container shell kas.yml
+    kas/kas-container --entrypoint /work/scripts/ci_setup.sh shell kas.yml
     ```
 
     In kas shell:
 
     ```
-    wget -q http://deb.isar-build.org/debian-isar.key -O- |gpg --dearmor \
-        |sudo dd of=/etc/apt/trusted.gpg.d/debian-isar.gpg
-    echo "deb [signed-by=/etc/apt/trusted.gpg.d/debian-isar.gpg] \
-        http://deb.isar-build.org/debian-isar bookworm-isar main" \
-        |sudo tee /etc/apt/sources.list.d/10-isar_build.list
-    sudo apt-get update
-    sudo apt-get install -y avocado qemu-system-arm qemu-system-x86
     cd /work/isar/testsuite
     avocado run citest.py -t dev --max-parallel-tasks=1
     ```
diff --git a/scripts/ci_setup.sh b/scripts/ci_setup.sh
new file mode 100755
index 00000000..f373d1c0
--- /dev/null
+++ b/scripts/ci_setup.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+# Script to setup a container for CI builds
+#
+# Cedric Hombourger <cedric.hombourger@siemens.com>
+# Copyright (c) Siemens AG, 2025
+# SPDX-License-Identifier: MIT
+
+gpg_key=/etc/apt/trusted.gpg.d/debian-isar.gpg
+[ -f "${gpg_key}" ] || {
+    wget -q http://deb.isar-build.org/debian-isar.key -O- \
+    | gpg --dearmor \
+    | sudo dd of="${gpg_key}"
+}
+
+list=/etc/apt/sources.list.d/10-isar_build.list
+[ -f "${list}" ] || {
+    echo "deb [signed-by=/etc/apt/trusted.gpg.d/debian-isar.gpg] \
+        http://deb.isar-build.org/debian-isar bookworm-isar main" \
+    | sudo tee /etc/apt/sources.list.d/10-isar_build.list
+}
+
+tools="avocado qemu-system-aarch64 qemu-system-arm qemu-system-i386 qemu-system-x86_64"
+need_install=0
+for tool in ${tools}; do
+    which "${tool}" || need_install=1
+done
+[ "${need_install}" = "0" ] || {
+    sudo apt-get update
+    sudo apt-get install -y avocado qemu-system-arm qemu-system-x86
+}
+
+exec /container-entrypoint ${*}
-- 
2.39.5

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