* bug#31889: Filesystems must not depend on device mappings?
@ 2018-06-18 21:11 Taylan Ulrich Bayırlı/Kammer
2018-06-20 21:17 ` Ludovic Courtès
0 siblings, 1 reply; 5+ messages in thread
From: Taylan Ulrich Bayırlı/Kammer @ 2018-06-18 21:11 UTC (permalink / raw)
To: 31889
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If in my OS config I define some luks mappings, and define the
corresponding filesystems with dependencies on the mapped devices,
I get an error on 'guix system reconfigure'.
Example:
(operating-system
...
(mapped-devices
(list (mapped-device ... (target "root"))))
(file-systems
(list (file-system (mount-point "/")
...
(dependencies mapped-devices))))
...)
This will yield an error like:
file-system-/ depends on device-mapping-root, which is not
provided by any service
Funnily enough, one only needs to remove the 'dependencies' field to
make it work. But this contradicts the example at:
https://www.gnu.org/software/guix/manual/html_node/Using-the-Configuration-System.html
Taylan
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^ permalink raw reply [flat|nested] 5+ messages in thread* bug#31889: Filesystems must not depend on device mappings?
2018-06-18 21:11 bug#31889: Filesystems must not depend on device mappings? Taylan Ulrich Bayırlı/Kammer
@ 2018-06-20 21:17 ` Ludovic Courtès
2018-06-21 18:44 ` Taylan Kammer
0 siblings, 1 reply; 5+ messages in thread
From: Ludovic Courtès @ 2018-06-20 21:17 UTC (permalink / raw)
To: Taylan Ulrich Bayırlı/Kammer; +Cc: 31889
Hi!
Taylan Ulrich "Bayırlı/Kammer" <taylanbayirli@gmail.com> skribis:
> If in my OS config I define some luks mappings, and define the
> corresponding filesystems with dependencies on the mapped devices,
> I get an error on 'guix system reconfigure'.
>
> Example:
>
> (operating-system
> ...
> (mapped-devices
> (list (mapped-device ... (target "root"))))
> (file-systems
> (list (file-system (mount-point "/")
> ...
> (dependencies mapped-devices))))
> ...)
>
> This will yield an error like:
>
> file-system-/ depends on device-mapping-root, which is not
> provided by any service
Could you show the complete ‘mapped-devices’ and ‘file-systems’ fields,
without ellipses?
The message above suggests that “/” was not considered as
needed-for-boot.
Thanks,
Ludo’.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31889: Filesystems must not depend on device mappings?
2018-06-20 21:17 ` Ludovic Courtès
@ 2018-06-21 18:44 ` Taylan Kammer
2018-06-21 21:55 ` Ludovic Courtès
0 siblings, 1 reply; 5+ messages in thread
From: Taylan Kammer @ 2018-06-21 18:44 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 31889
ludo@gnu.org (Ludovic Courtès) writes:
> Hi!
>
> Taylan Ulrich "Bayırlı/Kammer" <taylanbayirli@gmail.com> skribis:
>
>> If in my OS config I define some luks mappings, and define the
>> corresponding filesystems with dependencies on the mapped devices,
>> I get an error on 'guix system reconfigure'.
>>
>> Example:
>>
>> (operating-system
>> ...
>> (mapped-devices
>> (list (mapped-device ... (target "root"))))
>> (file-systems
>> (list (file-system (mount-point "/")
>> ...
>> (dependencies mapped-devices))))
>> ...)
>>
>> This will yield an error like:
>>
>> file-system-/ depends on device-mapping-root, which is not
>> provided by any service
>
> Could you show the complete ‘mapped-devices’ and ‘file-systems’ fields,
> without ellipses?
>
> The message above suggests that “/” was not considered as
> needed-for-boot.
>
> Thanks,
> Ludo’.
Sorry, looks like my example was wrong. Here is a problematic OS
declaration:
(operating-system
(host-name "guixsd")
(timezone "Europe/Berlin")
(locale "en_US.utf8")
(bootloader
(bootloader-configuration
(bootloader grub-bootloader)
(target "/dev/sda")))
(mapped-devices
(list (mapped-device
(source (uuid "b3d059f8-1c4f-4569-88dd-5485825b4373"))
(target "guixsd")
(type luks-device-mapping))
(mapped-device
(source (uuid "550d9258-bbbb-488c-af27-6b1fefa190ee"))
(target "home")
(type luks-device-mapping))))
(file-systems
(append
(list (file-system
(device "/dev/mapper/guixsd")
(mount-point "/")
(type "ext4")
(dependencies mapped-devices))
(file-system
(device "/dev/mapper/home")
(mount-point "/home")
(type "ext4")
(dependencies mapped-devices)))
%base-file-systems))
(users
(append
(list (user-account
(name "taylan")
(comment "Taylan Kammer")
(group "users")
(supplementary-groups '("wheel" "netdev" "audio" "video"))
(home-directory "/home/taylan")))
%base-user-accounts))
(packages %base-packages)
(services %desktop-services)
;; Allow resolution of '.local' host names with mDNS.
(name-service-switch %mdns-host-lookup-nss))
It results in the error message:
guix system: error: service 'file-system-/home' requires
'device-mapping-home', which is not provided by any service
(I also got that for '/' rather than '/home' at some point, but can't
remember under what conditions.)
It works when both '(dependencies mapped-devices)' clauses are simply
removed.
All in all I can't really figure out the logic behind the whole thing
and what exactly is expected. I think the error reporting and relevant
section of the documentation may need some improvement.
Taylan
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#31889: Filesystems must not depend on device mappings?
2018-06-21 18:44 ` Taylan Kammer
@ 2018-06-21 21:55 ` Ludovic Courtès
2018-06-22 18:21 ` Taylan Kammer
0 siblings, 1 reply; 5+ messages in thread
From: Ludovic Courtès @ 2018-06-21 21:55 UTC (permalink / raw)
To: Taylan Kammer; +Cc: 31889-done
Hi,
Taylan Kammer <taylanbayirli@gmail.com> skribis:
> (mapped-devices
> (list (mapped-device
> (source (uuid "b3d059f8-1c4f-4569-88dd-5485825b4373"))
> (target "guixsd")
> (type luks-device-mapping))
> (mapped-device
> (source (uuid "550d9258-bbbb-488c-af27-6b1fefa190ee"))
> (target "home")
> (type luks-device-mapping))))
>
> (file-systems
> (append
> (list (file-system
> (device "/dev/mapper/guixsd")
> (mount-point "/")
> (type "ext4")
> (dependencies mapped-devices))
> (file-system
> (device "/dev/mapper/home")
> (mount-point "/home")
> (type "ext4")
> (dependencies mapped-devices)))
> %base-file-systems))
[...]
> It results in the error message:
>
> guix system: error: service 'file-system-/home' requires
> 'device-mapping-home', which is not provided by any service
[...]
> It works when both '(dependencies mapped-devices)' clauses are simply
> removed.
Yes, it’s “expected”: using “/dev/mapper/xyz” as the device is enough to
express the dependency.
When passing (dependencies mapped-devices), the effect was to each file
system depend on *both* mapped devices. This leads to an inconsistency
because /dev/mapper/guixsd is “needed-for-boot” (i.e., set up from the
initrd), whereas /dev/mapper/home is not (i.e., set up as a Shepherd
service.)
The solution is to either use the /dev/mapper/xyz names in the ‘device’
field, or to specify only the relevant mapped device in ‘dependencies’.
Anyway, commit 68a58775e071d4b0e000b93ad121b6e64d161b79 fixes it by
doing exactly what this config asks for: setting up all the mapped
devices in the initrd.
Thanks,
Ludo’.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31889: Filesystems must not depend on device mappings?
2018-06-21 21:55 ` Ludovic Courtès
@ 2018-06-22 18:21 ` Taylan Kammer
0 siblings, 0 replies; 5+ messages in thread
From: Taylan Kammer @ 2018-06-22 18:21 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 31889-done
ludo@gnu.org (Ludovic Courtès) writes:
> Hi,
>
> Taylan Kammer <taylanbayirli@gmail.com> skribis:
>
>> (mapped-devices
>> (list (mapped-device
>> (source (uuid "b3d059f8-1c4f-4569-88dd-5485825b4373"))
>> (target "guixsd")
>> (type luks-device-mapping))
>> (mapped-device
>> (source (uuid "550d9258-bbbb-488c-af27-6b1fefa190ee"))
>> (target "home")
>> (type luks-device-mapping))))
>>
>> (file-systems
>> (append
>> (list (file-system
>> (device "/dev/mapper/guixsd")
>> (mount-point "/")
>> (type "ext4")
>> (dependencies mapped-devices))
>> (file-system
>> (device "/dev/mapper/home")
>> (mount-point "/home")
>> (type "ext4")
>> (dependencies mapped-devices)))
>> %base-file-systems))
>
> [...]
>
>> It results in the error message:
>>
>> guix system: error: service 'file-system-/home' requires
>> 'device-mapping-home', which is not provided by any service
>
> [...]
>
>> It works when both '(dependencies mapped-devices)' clauses are simply
>> removed.
>
> Yes, it’s “expected”: using “/dev/mapper/xyz” as the device is enough to
> express the dependency.
>
> When passing (dependencies mapped-devices), the effect was to each file
> system depend on *both* mapped devices. This leads to an inconsistency
> because /dev/mapper/guixsd is “needed-for-boot” (i.e., set up from the
> initrd), whereas /dev/mapper/home is not (i.e., set up as a Shepherd
> service.)
>
> The solution is to either use the /dev/mapper/xyz names in the ‘device’
> field, or to specify only the relevant mapped device in ‘dependencies’.
>
> Anyway, commit 68a58775e071d4b0e000b93ad121b6e64d161b79 fixes it by
> doing exactly what this config asks for: setting up all the mapped
> devices in the initrd.
>
> Thanks,
> Ludo’.
Thank you for the explanation and the fix! :-)
Taylan
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-06-22 16:22 UTC | newest]
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2018-06-18 21:11 bug#31889: Filesystems must not depend on device mappings? Taylan Ulrich Bayırlı/Kammer
2018-06-20 21:17 ` Ludovic Courtès
2018-06-21 18:44 ` Taylan Kammer
2018-06-21 21:55 ` Ludovic Courtès
2018-06-22 18:21 ` Taylan Kammer
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