Draft for making OTA images

alpine/sync-loop.sh

@@ -1,21 +1,29 @@
 #!/bin/bash
+set -euo pipefail
+
 DEVICE="$1"
 FAKE_DEV="/tmp/dev"
 
 mkdir -p "$FAKE_DEV"
+PARENT_NAME=$(basename "$DEVICE")
 
-echo "Refreshing partition table..."
-partx -u "$DEVICE" 2>/dev/null || partx -a "$DEVICE"
+echo "Refreshing partition table for $DEVICE..."
+partx -u "$DEVICE" 2>/dev/null || partx -a "$DEVICE" || true
+
+# Remove old fake nodes for this loop device first
+find "$FAKE_DEV" -maxdepth 1 -type b -name "${PARENT_NAME}*" -exec rm -f {} \;
 
-# Find partitions and their Major:Minor numbers
 lsblk -rn -o NAME,MAJ:MIN "$DEVICE" | while read -r NAME MAJMIN; do
-    # Skip the parent loop0
-    if [[ "$NAME" == "loop0" ]]; then continue; fi
+    # Skip the parent loop device itself
+    if [[ "$NAME" == "$PARENT_NAME" ]]; then
+        continue
+    fi
 
     PART_PATH="$FAKE_DEV/$NAME"
-    MAJOR=$(echo $MAJMIN | cut -d: -f1)
-    MINOR=$(echo $MAJMIN | cut -d: -f2)
+    MAJOR="${MAJMIN%%:*}"
+    MINOR="${MAJMIN##*:}"
 
     echo "Creating node: $PART_PATH (b $MAJOR $MINOR)"
+    rm -f "$PART_PATH"
     mknod "$PART_PATH" b "$MAJOR" "$MINOR"
 done