Support EROFS

EROFS, like Squashfs, is a read-only file system. It can be used to store airootfs in an image file.
Its advantage is the support for POSIX ACLs. EROFS downside is that currently it only supports LZ4 compression (LZMA support is not yet fully implemented).

A difference from Squashfs is that, EROFS stores change time (ctime) not modification time (mtime). The reverse is true for Squashfs.

Implements https://gitlab.archlinux.org/archlinux/archiso/-/issues/59

1 files changed, 8 insertions, 2 deletions

diff --git a/hooks/archiso_pxe_http b/hooks/archiso_pxe_http
index efae923..43b8b4b 100644
--- a/hooks/archiso_pxe_http
+++ b/hooks/archiso_pxe_http
@@ -39,6 +39,7 @@ _curl_get() {
 
 archiso_pxe_http_mount_handler () {
     newroot="${1}"
+    local img_type="sfs"
 
     msg ":: Mounting /run/archiso/httpspace (tmpfs) filesystem, size='${archiso_http_spc}'"
     mkdir -p "/run/archiso/httpspace"
@@ -46,7 +47,12 @@ archiso_pxe_http_mount_handler () {
 
     # shellcheck disable=SC2154
     # defined via initcpio's parse_cmdline()
-    _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sfs" "/${arch}"
+    if ! curl -L -f -o /dev/null -s -r 0-0 "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sfs"; then
+        if curl -L -f -o /dev/null -s -r 0-0 "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.erofs"; then
+            img_type="erofs"
+        fi
+    fi
+    _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.${img_type}" "/${arch}"
 
     # shellcheck disable=SC2154
     # defined via initcpio's parse_cmdline()
@@ -56,7 +62,7 @@ archiso_pxe_http_mount_handler () {
     # shellcheck disable=SC2154
     # defined via initcpio's parse_cmdline()
     if [ "${verify}" = "y" ]; then
-        _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sfs.sig" "/${arch}"
+        _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.${img_type}.sig" "/${arch}"
     fi
 
     mkdir -p "/run/archiso/bootmnt"