Arch Linux User Repository

Notes:

• This version is for kernel versions 5.18.x and 5.19.x .

5.19.x is untested for now though.

• shiftfs shouldn’t be mounted on top of idmapped mounts and vice versa (see: comment by developer)

For kernel version 5.15.x, see shiftfs-lts-dkms instead.

Details: shiftfs is a kernel filesystem for uid/gid-shifting.
It is used by LXD for example.

Note: The successor for shiftfs is available, see https://github.com/toby63/shiftfs-dkms#about for more information.

You find more details (including limitations etc.) in the official LXD forum:
https://discuss.linuxcontainers.org/t/trying-out-shiftfs/5155
https://discuss.linuxcontainers.org/t/lxd-usecases-of-shiftfs-volume-disk-share/7735
and in my Github repo: https://github.com/toby63/shiftfs-dkms

Report on the initial implementation in the Ubuntu Kernel repo:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1823186

Usage in LXD:

If you use the LXD package from the Arch Repos, shiftfs will be enabled by default.
You can check whether it is enabled with "lxc info" (look for: shiftfs: "true").

@dreieck:

1. I don't see an alternative, if you have one, I will consider any suggestion.
2. No problem, actually some time ago the situation was different, but another user pointed me towards using specific commits. This allows for me to test things a bit, before releasing a new version (in comparison to a -git version).

@G3ro:

1. Thanks, however, now you just have put SKIP for the checksum which skips the check, which is not what is really intented with the checksum.
2. You are right, I was looking too quickly. My fault and sorry for bothering!

regards!

@dreieck:

1. I fixed the checksum failure with the new release, thx for pointing this out, I was somehow thinking it would work, but it doesn't.

2. No, it is using a specific commit, so it is something like a fixed version.

Your package seems to use the latest version from git and not a fixed version.

So it should be renamed to shiftfs-dkms-git (i.e. with the git suffix).

Please rename (i.e.upload new and submit merge request to the old one).

Thanks for maintaining!

Source file checksum verification fails:

==> Validating source files with sha512sums...
    shiftfs.c ... FAILED

Thanks for maintaining!

Notes:

• This version is for kernel versions 5.18.x and 5.19.x .

5.19.x is untested for now though.

• shiftfs shouldn’t be mounted on top of idmapped mounts and vice versa (see: comment by developer)

For kernel version 5.15.x, see shiftfs-lts-dkms instead.

@G3ro: The build error you mentioned on 2021-05-02 also appeared for nullfs in 5.12-kernel. For nullfs, it has been fixed. So we need (to wait for) a similar fix here, too.

@gamezelda: Thx for the info. I didn't know that. I might include it in some time or rename the package with -git.

Apologies, I see now that it's mentioned very early in the link, I certainly should have RTFM better.

Regarding pinning to a specific commit, it can be done without any major changes, you can get a link to get the file at a specific commit from the cgit interface by going to the log tab -> specific commit -> tree tab -> "plain" link.

For example here's a link to shiftfs.c that is not to the latest commit: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/hirsute/plain/fs/shiftfs.c?h=master-next&id=eb00293db1e71f56d6cfa9bf2783ef7197765de6

(However I'm not 100% if that would actually keep working if they rebase the branch)