set rootfs partition name based on the distro

README.md

@@ -120,7 +120,7 @@ Debian Sid (the rolling release version of Debian) is also supported if you just
 sudo ./build_complete.sh dedede release=unstable
 ```
 
-There is also experimental support for Alpine Linux. Pass the `distro=alpine` to use it:
+There is also experimental support for Alpine Linux. The Alpine disk image is about half the size compared to Debian. Pass the `distro=alpine` to use it:
 ```bash
 sudo ./build_complete.sh dedede distro=alpine
 ```

build.sh

@@ -11,6 +11,7 @@ print_help() {
   echo "Valid named arguments (specify with 'key=value'):"
   echo "  quiet - Don't use progress indicators which may clog up log files."
   echo "  arch  - Set this to 'arm64' to specify that the shim is for an ARM chromebook."
+  echo "  name  - The name for the shimboot rootfs partition."
 }
 
 assert_root
@@ -22,11 +23,15 @@ output_path=$(realpath -m "${1}")
 shim_path=$(realpath -m "${2}")
 rootfs_dir=$(realpath -m "${3}")
 
+quiet="${args['quiet']}"
+arch="${args['arch']}"
+name="${args['name']}"
+
 print_info "reading the shim image"
 initramfs_dir=/tmp/shim_initramfs
 kernel_img=/tmp/kernel.img
 rm -rf $initramfs_dir $kernel_img
-extract_initramfs_full $shim_path $initramfs_dir $kernel_img "${args['arch']}"
+extract_initramfs_full $shim_path $initramfs_dir $kernel_img "$arch"
 
 print_info "patching initramfs"
 patch_initramfs $initramfs_dir
@@ -36,7 +41,7 @@ rootfs_size=$(du -sm $rootfs_dir | cut -f 1)
 rootfs_part_size=$(($rootfs_size * 12 / 10 + 5))
 #create a 20mb bootloader partition
 #rootfs partition is 20% larger than its contents
-create_image $output_path 20 $rootfs_part_size
+create_image $output_path 20 $rootfs_part_size $name
 
 print_info "creating loop device for the image"
 image_loop=$(create_loop ${output_path})
@@ -45,7 +50,7 @@ print_info "creating partitions on the disk image"
 create_partitions $image_loop $kernel_img
 
 print_info "copying data into the image"
-populate_partitions $image_loop $initramfs_dir $rootfs_dir "${args['quiet']}"
+populate_partitions $image_loop $initramfs_dir $rootfs_dir "$quiet"
 rm -rf $initramfs_dir $kernel_img
 
 print_info "cleaning up loop devices"

build_complete.sh

@@ -170,7 +170,7 @@ retry_cmd ./patch_rootfs.sh $shim_bin $reco_bin $rootfs_dir "quiet=$quiet"
 print_title "building final disk image"
 final_image="$data_dir/shimboot_$board.bin"
 rm -rf $final_image
-retry_cmd ./build.sh $final_image $shim_bin $rootfs_dir "quiet=$quiet" "arch=$arch"
+retry_cmd ./build.sh $final_image $shim_bin $rootfs_dir "quiet=$quiet" "arch=$arch" "name=$distro"
 print_info "build complete! the final disk image is located at $final_image"
 
 print_title "cleaning up"

image_utils.sh

@@ -19,7 +19,8 @@ make_bootable() {
 
 partition_disk() {
   local image_path=$(realpath -m "${1}")
-  local bootloader_size=${2}
+  local bootloader_size="$2"
+  local rootfs_name="$3"
 
   #create partition table with fdisk
   ( 
@@ -57,7 +58,7 @@ partition_disk() {
     echo x #enter expert mode
     echo n #change the partition name
     echo #accept default partition number
-    echo "shimboot_rootfs:default" #set partition name
+    echo "shimboot_rootfs:$rootfs_name" #set partition name
     echo r #return to normal more
 
     #write changes
@@ -128,15 +129,16 @@ populate_partitions() {
 
 create_image() {
   local image_path=$(realpath -m "${1}")
-  local bootloader_size=${2}
-  local rootfs_size=${3}
+  local bootloader_size="$2"
+  local rootfs_size="$3"
+  local rootfs_name="$4"
 
   #stateful + kernel + bootloader + rootfs
   local total_size=$((1 + 32 + $bootloader_size + $rootfs_size))
   rm -rf "${image_path}"
   fallocate -l "${total_size}M" "${image_path}"
 
-  partition_disk $image_path $bootloader_size
+  partition_disk $image_path $bootloader_size $rootfs_name
 }
 
 patch_initramfs() {