guix/gnu/system
Ryan Sundberg 62c28bc6d8
image: Use unshare to map root user for btrfs
The current version of `mkfs.btrfs` has a regression when combined with
`fakeroot` where it does not detect the faked root uid/gid of files when
building the filesystem. This produces partition images with `/` owned by
the guixbuild user when it should be owned by root.

Using `unshare` rather than `fakeroot` resolves this by doing the uid
mapping at the kernel level rather than overloading the `stat` function.

An equivalent issue was [reported and patched in
NixOS](https://github.com/NixOS/nixpkgs/pull/434122)

* gnu/build/image.scm (system-disk-image): Import `util-linux` instead of
`fakeroot`.
* gnu/system/image.scm (make-btrfs-image): Use `unshare --map-root-user`

Change-Id: Id4eeaf510f3ec5f4a23b4d700a73e2cf46da40b1
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Merges: #5536
2026-01-12 10:56:38 +01:00
..
examples
images
accounts.scm
file-systems.scm
hurd.scm
image.scm
install.scm
keyboard.scm
linux-container.scm
linux-initrd.scm
locale.scm
mapped-devices.scm
nss.scm
pam.scm
privilege.scm
setuid.scm
shadow.scm
uuid.scm
vm.scm