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, 5 insertions, 3 deletions

diff --git a/README.profile.rst b/README.profile.rst
index 6541bd7..7680628 100644
--- a/README.profile.rst
+++ b/README.profile.rst
@@ -49,9 +49,11 @@ The image file is constructed from some of the variables in **profiledef.sh**: `
 
   - `squashfs`: Create a squashfs image directly from the airootfs work directory
   - `ext4+squashfs`: Create an ext4 partition, copy the airootfs work directory to it and create a squashfs image from it
-* `airootfs_image_tool_options`: An array of options to pass to the tool to create the airootfs image. Currently only
-  `mksquashfs` is supported - see `mksquashfs --help` for all possible options (defaults to `('-comp' 'xz')`).
-  - `file_permissions`: An associative array that lists files and/or directories who need specific ownership or
+  - `erofs`: Create an EROFS image for the airootfs work directory
+* `airootfs_image_tool_options`: An array of options to pass to the tool to create the airootfs image. `mksquashfs` and
+  `mkfs.erofs` are supported. See `mksquashfs --help` or `mkfs.erofs --help` for all possible options (defaults to
+  `('-comp' 'xz')` for squashfs).
+* `file_permissions`: An associative array that lists files and/or directories who need specific ownership or
   permissions. The array's keys contain the path and the value is a colon separated list of owner UID, owner GID and
   access mode. E.g. `file_permissions=(["/etc/shadow"]="0:0:400")`.