feat: Add script to extract binary from ARM Linux image

Add a new script `armlinux_loopdev_extract.sh` to extract the binary
file from an ARM Linux image. This script sets up loop devices, mounts
the partition, and copies the binary file to the specified output file.

The script checks if the necessary arguments are provided and verifies
the existence of the image file. It then sets up a loop device for the
image, identifies and mounts the second partition, copies the binary,
and unmounts/detaches loop devices upon completion.

The addition enhances automation by facilitating extraction of binaries
from ARM Linux images efficiently.

.github/workflows/release.yml

@@ -121,20 +121,15 @@ jobs:
           mkdir -p ${{ matrix.copy_artifact_dest }}
     - name: Extract Artifact from output image
       run: |
-        # debugging purpose, we upload image to artifacts
-        mkdir -p ./release
-        cp ${{ steps.arm_runner_install.outputs.image }} cg-${{ matrix.arch }}.img
+        sudo apt-get install -y fdisk parted
+        chmod +x ./ci/armlinux_loopdev_extract.sh
+        ./ci/armlinux_loopdev_extract.sh  ${{ steps.arm_runner_install.outputs.image }} cg-${{ matrix.arch }}.elf
+
     - name: Upload Artifact (ARM)
       uses: actions/upload-artifact@v4
       with:
-        name: cg-${{ matrix.arch }}.img
-        path: cg-${{ matrix.arch }}.img
-
-    # - name: Upload Artifact (ARM)
-    #   uses: actions/upload-artifact@v4
-    #   with:
-    #     name: release/cg-${{ matrix.arch }}.elf
-    #     path: release/cg-${{ matrix.arch }}.elf
+        name: cg-${{ matrix.arch }}.elf
+        path: cg-${{ matrix.arch }}.elf
 
   release:
     needs: [build, build_arm]

ci/armlinux_loopdev_extract.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+
+# Check if the user provided an image file and output file
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 <image_file> <output_file>"
+    exit 1
+fi
+
+IMG_FILE=$1
+OUTPUT_FILE=$2
+PWD=$(pwd)
+MNT_POINT="$PWD/mnt"
+
+# Check if the file exists
+if [ ! -f "$IMG_FILE" ]; then
+    echo "File not found: $IMG_FILE"
+    exit 1
+fi
+
+# Setup loop device and get partitions info
+LOOP_DEVICE=$(sudo losetup -fP --show "$IMG_FILE")
+
+if [ $? -ne 0 ]; then
+    echo "Failed to setup loop device for $IMG_FILE"
+    exit 1
+fi
+
+echo "Created loopback device ${LOOP_DEVICE}"
+
+# Check the partition table
+sudo parted -s "$LOOP_DEVICE" print
+
+# Get partition information
+PARTITION_INFO=$(sudo parted -s "$LOOP_DEVICE" unit s print | grep "^ [0-9]")
+
+if [ $? -ne 0 ]; then
+    echo "Failed to get partition information"
+    sudo losetup -d "$LOOP_DEVICE"
+    exit 1
+fi
+
+# Parse the second partition details
+PARTITION_OFFSET=$(echo "$PARTITION_INFO" | awk 'NR==2 {print $2}' | sed 's/s//')
+PARTITION_SIZE=$(echo "$PARTITION_INFO" | awk 'NR==2 {print $4}' | sed 's/s//')
+
+# Create a loop device for the second partition
+PARTITION_LOOP_DEVICE=$(sudo losetup -o $((PARTITION_OFFSET * 512)) --sizelimit $((PARTITION_SIZE * 512)) --show -f "$LOOP_DEVICE")
+
+if [ $? -ne 0 ]; then
+    echo "Failed to create loop device for partition"
+    sudo losetup -d "$LOOP_DEVICE"
+    exit 1
+fi
+
+# Create the mount point directory if it doesn't exist
+mkdir -p $MNT_POINT
+
+# Mount the partition
+sudo mount "$PARTITION_LOOP_DEVICE" $MNT_POINT
+
+if [ $? -ne 0 ]; then
+    echo "Failed to mount partition"
+    sudo losetup -d "$PARTITION_LOOP_DEVICE"
+    sudo losetup -d "$LOOP_DEVICE"
+    exit 1
+fi
+
+# Copy the binary file from the mounted partition to the output file
+sudo cp $MNT_POINT/cg/*.elf $OUTPUT_FILE
+
+if [ $? -ne 0 ]; then
+    echo "Failed to copy the binary file"
+    sudo umount $MNT_POINT
+    sudo losetup -d "$PARTITION_LOOP_DEVICE"
+    sudo losetup -d "$LOOP_DEVICE"
+    exit 1
+fi
+
+echo "Binary file copied successfully to $OUTPUT_FILE"
+
+# Cleanup function to unmount and detach loop devices
+cleanup() {
+    sudo umount $MNT_POINT
+    sudo losetup -d "$PARTITION_LOOP_DEVICE"
+    sudo losetup -d "$LOOP_DEVICE"
+}
+
+# Trap EXIT signal to ensure cleanup is done
+trap cleanup EXIT