storage: remove aufs driver

There are no signs that anyone still uses aufs, no major distro seem to
support it so let's remove it and it hasn't been tested in CI for over
for years[1].

Remove the driver code and config fields for it. There are still a bunch
of references in pkg/archive which I have kept as I am not sure how much
of that still applies.

[1] containers/storage@a54d4e3

Fixes: #342

Signed-off-by: Paul Holzinger <[email protected]>

Author: Luap99

storage/contrib/cirrus/build_and_test.sh

@@ -25,9 +25,6 @@ case $TEST_DRIVER in
     vfs)
         showrun make STORAGE_DRIVER=vfs local-test-integration local-test-unit
         ;;
-    aufs)
-        showrun make STORAGE_DRIVER=aufs local-test-integration local-test-unit
-        ;;
     btrfs)
         # Fedora: Needs btrfs-progs, btrfs-progs-devel
         # Debian: Needs btrfs-progs, libbtrfs-dev

storage/docs/containers-storage.conf.5.md

@@ -27,7 +27,7 @@ No bare options are used. The format of TOML can be simplified to:
 The `storage` table supports the following options:
 
 **driver**=""
-  Copy On Write (COW) container storage driver. Valid drivers are "overlay", "vfs", "aufs", "btrfs", and "zfs". Some drivers (for example, "zfs", "btrfs", and "aufs") may not work if your kernel lacks support for the filesystem.
+  Copy On Write (COW) container storage driver. Valid drivers are "overlay", "vfs", "btrfs", and "zfs". Some drivers (for example, "zfs" and "btrfs") may not work if your kernel lacks support for the filesystem.
 This field is required to guarantee proper operation.
 Valid rootless drivers are "btrfs", "overlay", and "vfs".
 Rootless users default to the driver defined in the system configuration when possible.
@@ -145,13 +145,6 @@ The `storage.options.pull_options` table supports the following keys:
 
   This is a "string bool": "false"|"true" (cannot be native TOML boolean)
 
-### STORAGE OPTIONS FOR AUFS TABLE
-
-The `storage.options.aufs` table supports the following options:
-
-**mountopt**=""
-  Comma separated list of default options to be used to mount container images.  Suggested value "nodev". Mount options are documented in the mount(8) man page.
-
 ### STORAGE OPTIONS FOR BTRFS TABLE
 
 The `storage.options.btrfs` table supports the following options:
@@ -210,7 +203,7 @@ attribute permissions to processes within containers rather than the
 for mounting the file system. In rootless mode, without the CAP_SYS_ADMIN
 capability, many kernels prevent mounting of overlay file systems, requiring
 you to specify a mount_program. The mount_program option is also required on
-systems where the underlying storage is btrfs, aufs, zfs, overlay, or ecryptfs
+systems where the underlying storage is btrfs, zfs, overlay, or ecryptfs
 based file systems.
   mount_program = "/usr/bin/fuse-overlayfs"