Re: [PATCH 1/5] host/rootfs: make passwd and group links into /run

Demi Marie Obenour
2025-12-09T11:16:03Z

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On 12/9/25 06:11, Alyssa Ross wrote:
> Demi Marie Obenour <demiobenour@gmail.com> writes:
>
>> On 12/9/25 05:57, Alyssa Ross wrote:
>>> Demi Marie Obenour <demiobenour@gmail.com> writes:
>>>
>>>> On 12/9/25 03:56, Alyssa Ross wrote:
>>>>> This will allow us to give shadow's useradd /run as a prefix, and have
>>>>> it be able to add users at runtime.
>>>>>
>>>>> Signed-off-by: Alyssa Ross <hi@alyssa.is>
>>>>> ---
>>>>> host/rootfs/file-list.mk | 6 ++++--
>>>>> host/rootfs/image/etc/group | 16 +---------------
>>>>> host/rootfs/image/etc/passwd | 2 +-
>>>>> .../etc/{ => s6-linux-init/run-image/etc}/group | 0
>>>>> .../run-image/etc}/group.license | 0
>>>>> .../etc/{ => s6-linux-init/run-image/etc}/passwd | 0
>>>>> .../run-image/etc}/passwd.license | 0
>>>>
>>>> Is git somehow generating wrong diffstats?
>>>
>>> It just generates extremely confusing output when you replace a file
>>> with a symlink.
>>>
>>>>> 7 files changed, 6 insertions(+), 18 deletions(-)
>>>>> mode change 100644 => 120000 host/rootfs/image/etc/group
>>>>> mode change 100644 => 120000 host/rootfs/image/etc/passwd
>>>>> copy host/rootfs/image/etc/{ => s6-linux-init/run-image/etc}/group (100%)
>>>>> rename host/rootfs/image/etc/{ => s6-linux-init/run-image/etc}/group.license (100%)
>>>>> copy host/rootfs/image/etc/{ => s6-linux-init/run-image/etc}/passwd (100%)
>>>>> rename host/rootfs/image/etc/{ => s6-linux-init/run-image/etc}/passwd.license (100%)
>>>>>
>>>>> diff --git a/host/rootfs/file-list.mk b/host/rootfs/file-list.mk
>>>>> index df22bce..6ab78e6 100644
>>>>> --- a/host/rootfs/file-list.mk
>>>>> +++ b/host/rootfs/file-list.mk
>>>>> @@ -4,13 +4,13 @@
>>>>> FILES = \
>>>>> image/etc/fonts/fonts.conf \
>>>>> image/etc/fstab \
>>>>> - image/etc/group \
>>>>> image/etc/init \
>>>>> image/etc/login \
>>>>> image/etc/parse-devname \
>>>>> - image/etc/passwd \
>>>>> image/etc/s6-linux-init/env/WAYLAND_DISPLAY \
>>>>> image/etc/s6-linux-init/env/XDG_RUNTIME_DIR \
>>>>> + image/etc/s6-linux-init/run-image/etc/group \
>>>>> + image/etc/s6-linux-init/run-image/etc/passwd \
>>>>> image/etc/s6-linux-init/run-image/service/getty-tty1/run \
>>>>> image/etc/s6-linux-init/run-image/service/getty-tty2/run \
>>>>> image/etc/s6-linux-init/run-image/service/getty-tty3/run \
>>>>> @@ -68,6 +68,8 @@ FILES = \
>>>>>
>>>>> LINKS = \
>>>>> image/bin \
>>>>> + image/etc/group \
>>>>> + image/etc/passwd \
>>>>> image/etc/s6-linux-init/run-image/opengl-driver \
>>>>> image/etc/s6-linux-init/run-image/service/vmm/template/run \
>>>>> image/lib \
>>>>> diff --git a/host/rootfs/image/etc/group b/host/rootfs/image/etc/group
>>>>> deleted file mode 100644
>>>>> index e3ade46..0000000
>>>>> --- a/host/rootfs/image/etc/group
>>>>> +++ /dev/null
>>>>> @@ -1,15 +0,0 @@
>>>>> -root:x:0:root
>>>>> -clock:x:1:
>>>>> -dialout:x:2:
>>>>> -kmem:x:3:
>>>>> -input:x:4:
>>>>> -tty:x:5:
>>>>> -video:x:6:
>>>>> -render:x:7:
>>>>> -sgx:x:8:
>>>>> -audio:x:9:
>>>>> -lp:x:10:
>>>>> -disk:x:11:
>>>>> -cdrom:x:12:
>>>>> -tape:x:13:
>>>>> -kvm:x:14:
>>>>
>>>> Why is this file deleted and not renamed?
>>>
>>> git considers it a copy (see below) followed by a deletion and
>>> replacement with symlink. It is, effectively, renamed.
>>>
>>>>> diff --git a/host/rootfs/image/etc/group b/host/rootfs/image/etc/group
>>>>> new file mode 120000
>>>>> index 0000000..a9b248e
>>>>> --- /dev/null
>>>>> +++ b/host/rootfs/image/etc/group
>>>>> @@ -0,0 +1 @@
>>>>> +/run/etc/group
>>>>
>>>> ../run/etc/group?
>>>
>>> Okay, makes sense.
>>>
>>>>> \ No newline at end of file
>>>>> diff --git a/host/rootfs/image/etc/passwd b/host/rootfs/image/etc/passwd
>>>>> deleted file mode 100644
>>>>> index 29f3b25..0000000
>>>>> --- a/host/rootfs/image/etc/passwd
>>>>> +++ /dev/null
>>>>> @@ -1 +0,0 @@
>>>>> -root:x:0:0:System administrator:/:/bin/sh
>>>>> diff --git a/host/rootfs/image/etc/passwd b/host/rootfs/image/etc/passwd
>>>>> new file mode 120000
>>>>> index 0000000..889bb76
>>>>> --- /dev/null
>>>>> +++ b/host/rootfs/image/etc/passwd
>>>>> @@ -0,0 +1 @@
>>>>> +/run/etc/passwd
>>>>
>>>> ../run/etc/passwd?
>>>>
>>>>> \ No newline at end of file
>>>>> diff --git a/host/rootfs/image/etc/group b/host/rootfs/image/etc/s6-linux-init/run-image/etc/group
>>>>> similarity index 100%
>>>>> copy from host/rootfs/image/etc/group
>>>>> copy to host/rootfs/image/etc/s6-linux-init/run-image/etc/group
>>>>> diff --git a/host/rootfs/image/etc/group.license b/host/rootfs/image/etc/s6-linux-init/run-image/etc/group.license
>>>>> similarity index 100%
>>>>> rename from host/rootfs/image/etc/group.license
>>>>> rename to host/rootfs/image/etc/s6-linux-init/run-image/etc/group.license
>>>>> diff --git a/host/rootfs/image/etc/passwd b/host/rootfs/image/etc/s6-linux-init/run-image/etc/passwd
>>>>> similarity index 100%
>>>>> copy from host/rootfs/image/etc/passwd
>>>>> copy to host/rootfs/image/etc/s6-linux-init/run-image/etc/passwd
>>>>> diff --git a/host/rootfs/image/etc/passwd.license b/host/rootfs/image/etc/s6-linux-init/run-image/etc/passwd.license
>>>>> similarity index 100%
>>>>> rename from host/rootfs/image/etc/passwd.license
>>>>> rename to host/rootfs/image/etc/s6-linux-init/run-image/etc/passwd.license
>>>>>
>>>>> base-commit: d0efa283216ebc503b4b715c051518ae7dbd8409
>>>>
>>>>
>>>> --
>>>> Sincerely,
>>>> Demi Marie Obenour (she/her/hers)
>>
>> Assuming I understood the diff correctly, and with relative symlinks:
>>
>> Reviewed-by: Demi Marie Obenour <demiobenour@gmail.com>
>
> Wait, actually, why do we want relative symlinks? Previously I've used
> them so you can follow the symlinks in the development tree, but that
> doesn't work here anyway because there's obviously no run in the tree.

Some tooling refuses to handle absolute symlinks as a security measure.
Not being able to copy a Spectrum development tree using Qubes OS's
qvm-copy would be less than great :). Furthermore, I'd rather be
pointed to a nonexistent location in the development tree than to
a nonexistent location in the real /run (which, on some systems,
might even exist).
--
Sincerely,
Demi Marie Obenour (she/her/hers)

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