[PATCH] installer: allow unattended mode to abort with keypress

["'Badrikesh Prusty' via isar-users" <isar-users@googlegroups.com>]

Add a 5-second countdown before unattended installation starts. Allow
users to abort unattended mode via keypress. Notify all console instances
via a shared file (`/tmp/attended_mode_trigger`) so the abort applies
across all consoles.

Signed-off-by: Badrikesh Prusty <badrikesh.prusty@siemens.com>
---
 RECIPE-API-CHANGELOG.md                           |  6 ++++++
 .../files/usr/bin/deploy-image-wic.sh             | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
index 3af91541..cd1f1fd4 100644
--- a/RECIPE-API-CHANGELOG.md
+++ b/RECIPE-API-CHANGELOG.md
@@ -941,3 +941,9 @@ Example: To bundle multiple target images, set the following in local.conf:
 ```
 INSTALLER_TARGET_IMAGES = "isar-image-base isar-image-debug isar-image-ci"
 ```
+
+### Allow unattended installation to be interrupted by keypress
+
+Add a 5-second countdown before unattended installation starts. Allow users to
+abort unattended mode via keypress. Notify all console instances via a shared
+file (`/tmp/attended_mode_trigger`) so the abort applies across all consoles.
diff --git a/meta-isar/recipes-installer/deploy-image/files/usr/bin/deploy-image-wic.sh b/meta-isar/recipes-installer/deploy-image/files/usr/bin/deploy-image-wic.sh
index 9bd47e9f..5736a861 100755
--- a/meta-isar/recipes-installer/deploy-image/files/usr/bin/deploy-image-wic.sh
+++ b/meta-isar/recipes-installer/deploy-image/files/usr/bin/deploy-image-wic.sh
@@ -10,6 +10,21 @@ SCRIPT_DIR=$( dirname -- "$( readlink -f -- "$0"; )"; )
 
 . "${SCRIPT_DIR}/../lib/deploy-image-wic/handle-config.sh"
 
+if $installer_unattended; then
+    abort_file=/tmp/attended_mode_trigger
+    for ((i=5; i>0; i--)); do
+        echo -ne "\rUnattended installation will start in $i seconds. Press any key to switch to attended mode..."
+
+	# Switch to attended mode if the abort file exists or any key pressed during countdown
+	# Create abort file to notify all other console instances to abort
+        if [ -f "$abort_file" ] || read -n 1 -t 1; then
+            installer_unattended=false
+            touch "$abort_file"
+            break
+        fi
+    done
+fi
+
 if ! $installer_unattended; then
     installer_image_uri=$(find "$installdata" -type f -iname "*.wic*" -a -not -iname "*.wic.bmap" -exec basename {} \;)
     if [ -z "$installer_image_uri" ] || [ ! -f "$installdata/$installer_image_uri" ]; then
-- 
2.47.3

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