Improve test coverage for prepare plugins in image mode

.packit.yaml

@@ -123,10 +123,20 @@ _:
     tf_extra_params:
       environments:
         - tmt:
-            context:
+            context: &provision-context
               how: provision
           <<: *tmt-cloud-resources
 
+  # Image mode
+  - &image-mode
+    tf_extra_params:
+      environments:
+        - tmt:
+            context:
+              <<: *provision-context
+              image_mode: "yes"
+          <<: *tmt-cloud-resources
+
 jobs:
   # Build released bits to stable
   - <<: *copr-under-teemtee
@@ -176,6 +186,11 @@ jobs:
     identifier: provision-virtual
     tmt_plan: /plans/provision/virtual
 
+  - <<: *provision
+    <<: *image-mode
+    identifier: provision-virtual-image-mode
+    tmt_plan: /plans/provision/virtual
+
   # Test internal plugins
   - <<: *test-base
     <<: *internal

plans/provision/virtual.fmf

@@ -60,9 +60,18 @@ adjust+:
     because: Disable IPv6 in CI to avoid IPv6 connections that are disabled in CI
     when: trigger == commit
 
+  - discover+:
+        filter: 'tag:provision-virtual & tag:image-mode'
+    environment+:
+        IMAGE_MODE: "yes"
+    when: image_mode == yes
+
 /provision:
     discover+:
         test: "^/tests/provision"
+    adjust+:
+      - enabled: false
+        when: image_mode != yes
 
 /prepare:
     discover+:
@@ -77,11 +86,20 @@ adjust+:
     discover+:
         test: "^/tests/execute"
         exclude: "^/tests/execute/upgrade"
+    adjust+:
+      - enabled: false
+        when: image_mode != yes
 
 /upgrade:
     discover+:
         test: "^/tests/execute/upgrade"
+    adjust+:
+      - enabled: false
+        when: image_mode != yes
 
 /the-rest:
     discover+:
         test: "^/tests/(?!provision|prepare|execute)"
+    adjust+:
+      - enabled: false
+        when: image_mode != yes

tests/images.sh

@@ -51,6 +51,19 @@ fedora-coreos}"
 # combinations, just make sure the basic functionality works.
 TEST_VIRTUAL_IMAGES_SECONDARY="${TEST_VIRTUAL_IMAGES_SECONDARY:-fedora-42}"
 
+# Base URL for image mode qcow2s
+IMAGE_MODE_QCOW2_BASE_URL="https://artifacts.dev.testing-farm.io/images"
+
+# Image mode QCOW2 images, with mapping to compatible container image used for artifacts downloading
+declare -A IMAGE_MODE_QCOW2_CONTAINER_MAP
+IMAGE_MODE_QCOW2_CONTAINER_MAP=(
+  ["$IMAGE_MODE_QCOW2_BASE_URL/CentOS-Stream-10-image-mode-x86_64.qcow2"]="centos:stream10"
+  ["$IMAGE_MODE_QCOW2_BASE_URL/Fedora-44-image-mode-x86_64.qcow2"]="fedora:44"
+)
+
+# Set of image mode virtual images to test on.
+TEST_IMAGE_MODE_IMAGES="${TEST_IMAGE_MODE_IMAGES:-$(printf "%s\n" "${!IMAGE_MODE_QCOW2_CONTAINER_MAP[@]}")}"
+
 # A couple of "is image this?" helpers, to simplify conditions.
 function is_fedora_rawhide () {
     [[ "$1" =~ ^.*fedora/rawhide[:/].* ]] && return 0
@@ -90,6 +103,7 @@ function is_centos_stream_9 () {
 function is_centos_stream_10 () {
     [[ "$1" =~ ^.*centos/stream10[:/].* ]] && return 0
     [[ "$1" = "centos-stream-10" ]] && return 0
+    [[ "$1" =~ CentOS-Stream-10 ]] && return 0
 
     return 1
 }
@@ -130,11 +144,11 @@ function is_fedora_coreos () {
 }
 
 function is_fedora () {
-    [[ "$1" =~ ^.*fedora.* ]] && return 0 || return 1
+    [[ "${1,,}" =~ ^.*fedora.* ]] && return 0 || return 1
 }
 
 function is_centos () {
-    [[ "$1" =~ ^.*centos.* ]] && return 0 || return 1
+    [[ "${1,,}" =~ ^.*centos.* ]] && return 0 || return 1
 }
 
 function is_rhel () {
@@ -153,6 +167,10 @@ function is_ubi_8 () {
     [[ "$1" =~ ^.*ubi/8.* ]] && return 0 || return 1
 }
 
+function is_image_mode () {
+    [[ "$1" =~ image-mode ]]
+}
+
 function test_phase_prefix () {
     if [ "$PROVISION_HOW" = "local" ]; then
         echo "[$PROVISION_HOW]"

tests/prepare/install/data/reboot-persistence.fmf

@@ -0,0 +1,20 @@
+summary: Verify installed packages persist after reboot
+description: |
+    Install packages and verify they survive a reboot.
+    This is critical for image mode where changes are applied
+    via Containerfile rebuild and bootc switch.
+
+prepare:
+  - how: install
+    package:
+      - tree
+      - diffutils
+
+execute:
+    how: tmt
+    script: |
+        tree --version
+        diff --version
+        if [ "$TMT_REBOOT_COUNT" == "0" ]; then
+            tmt-reboot
+        fi

tests/prepare/install/main.fmf

@@ -10,6 +10,7 @@ tag+:
   - provision-only
   - provision-container
   - provision-virtual
+  - image-mode
 
 # TODO: what test cases are safe enough to be executed against the localhost?
 #  - provision-local