Without this change, users that have both `initialHashedPassword` and
`hashedPassword` set will have `initialHashedPassword` take precedence,
but only for the first time `/etc/passwd` is generated. After that,
`hashedPassword` takes precedence. This is surprising behavior as it
would generally be expected for `hashedPassword` to win if both are set.
This wouldn't be a noticeable problem (and an assert could just be made
instead) if the users-groups module did not default the
`root.intialHashedPassword` value to `!`, to prevent login by default.
That means that users who set `root.hashedPassword` and use an ephemeral
rootfs (i.e. `/etc/passwd` is created every boot) are not able to log in
to the root account by default, unless they switch to a new generation
during the same boot (i.e. `/etc/passwd` already exists and
`hashedPassword` is used instead of `initialHashedPassword`) or they set
`root.initialHashedPassword = null` (which is unintuitive and seems
redundant).
It looks like the systemd-initrd variant of the systemd-shutdown test
(systemd-initrd-shutdown) did not actually enable the systemd-initrd and
so was just evaluating to the same store path before this change.
In general the man pages do not care what OS and manual they are shipped
with, so they don't get to choose the names of them. We were tempted to
do so, as we had inconsistently chosen OS names for the mandoc and
man-db/groff implementations. Since this has been rectified since, we
can just drop this boilerplate from the man pages.
We’ve been having trouble figuring out which kind of token to use and
why our setup would break every few system updates.
This should clarify which options there are, and which ones lead to
better results.
Ideally there would be a manual section that has a step-by-step guide
on how to set up the github runner, with screenshots and everything.
Purge contents of `workDir` as root to also allow the removal of files
marked as read-only. It is easy to create read-only files in `workDir`,
e.g., by copying files from the Nix store.
This builds on top of nixpkgs mainline 00d8347180
with the following two PRs cherry-picked:
- https://github.com/NixOS/nixpkgs/pull/192670
- https://github.com/NixOS/nixpkgs/pull/192668
using the following command:
```
nix build -f nixos -L \
-I nixos-config=nixos/modules/installer/sd-card/sd-image-powerpc64le.nix \
config.system.build.sdImage
```
I was able to successfully boot the image, although it boots to a login prompt
rather than a shell, and won't accept the empty password for `root`. I guess
I'll have to figure out why that is.
To boot the image: `zstd`-decompress the it, mount it, and use `kexec`:
```
cd boot/nixos
kexec -l \
*-vmlinux \
--initrd *-initrd \
--dt-no-old-root \
--command-line="$(grep APPEND ../extlinux/extlinux.conf | sed 's_^ *APPEND *__')"
```
The machine I used for testing has only one storage device which is completely
allocated to LVM. It appears that the NixOS ISO loader doesn't look for
partition tables within LVM volumes. To work aroundn this, I had to extract the
`ext4` image within the partition table within the `sd-card` image and put that
in its own LVM volume. This likely won't be an obstacle for users who write the
image to a USB stick or similar.
