mkarchiso: use an empty UUID for EROFS

The UUID is never used for anything, since the file system resides in a
file. Instead of generating a reproducible UUID for it, use
`00000000-0000-0000-0000-000000000000` instead.

CHANGELOG.rst

@@ -11,6 +11,8 @@ Added
 Changed
 -------
 
+- Use an empty UUID for the EROFS image file since the file system will never be referenced by it.
+
 Deprecated
 ----------
 

archiso/mkarchiso

@@ -223,16 +223,14 @@ _mkairootfs_squashfs() {
 
 # Create an EROFS image containing the root file system and saves it on the ISO 9660 file system.
 _mkairootfs_erofs() {
-    local fsuuid mkfs_erofs_options=()
+    local mkfs_erofs_options=()
     [[ -e "${pacstrap_dir}" ]] || _msg_error "The path '${pacstrap_dir}' does not exist" 1
 
     install -d -m 0755 -- "${isofs_dir}/${install_dir}/${arch}"
     local image_path="${isofs_dir}/${install_dir}/${arch}/airootfs.erofs"
     rm -f -- "${image_path}"
     [[ ! "${quiet}" == "y" ]] || mkfs_erofs_options+=('--quiet')
-    # Generate reproducible file system UUID from SOURCE_DATE_EPOCH
-    fsuuid="$(uuidgen --sha1 --namespace 93a870ff-8565-4cf3-a67b-f47299271a96 --name "${SOURCE_DATE_EPOCH}")"
-    mkfs_erofs_options+=('-U' "${fsuuid}" "${airootfs_image_tool_options[@]}")
+    mkfs_erofs_options+=('-U' '00000000-0000-0000-0000-000000000000' "${airootfs_image_tool_options[@]}")
     _msg_info "Creating EROFS image, this may take some time..."
     mkfs.erofs "${mkfs_erofs_options[@]}" -- "${image_path}" "${pacstrap_dir}"
     _msg_info "Done!"