Snapcraft

snapcraft kernel plugin puts module and firmware under 15.04-era lib/ directory

Bug #1658177 reported by Luke Williams
16
This bug affects 3 people
Affects Status Importance Assigned to Milestone
Snapcraft
Fix Released
Critical
Loïc Minier
Snapcraft 2.27

Bug Description

I built a custom kernel with custom modules built in. I can build the kernel snap and build the custom image using ubuntu-image and install it on my device with no issues, however, when I try to list the installed modules, no modules are installed and I get an error message saying that the /lib/modules/`uname -r`/modules.dep.bin is missing, which, if I go to /lib/modules/ the directory is empty. However, if I browse to /snap/kernel/x1/lib/modules/`uname -r`/ there everything is.

I included the kernel snap, my redacted model, and the kernel snap snapcraft.yaml. I build the image with the following command:

sudo /snap/bin/ubuntu-image -c edge -o fb-snappy.img --extra-snaps fb-kernel_3.18.25_amd64.snap fb-onl.model

I'm running ubuntu-image 0.12+real1

Let me know if you need any other information.

Thanks,
Luke

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Luke Williams (wililupy) wrote :
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Luke Williams (wililupy) wrote :
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Luke Williams (wililupy) wrote :
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John Lenton (chipaca) wrote :

Can you tell us the contents of /proc/cmdline, and the output of “ls /var/lib/snapd/snaps” and “snap list”? Thanks.

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Oliver Grawert (ogra) wrote :

hmm, the use of CONFOG_LOCALVERSION makes your modules dir be called "3.18.25-OpenNetworkLinux" ... the snapcraft.yaml does not use this version string (lacking the -OpenNetworkLinux) ... try adding this proper so the snap version actually matches the content versioning ...

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Oliver Grawert (ogra) wrote :

(or alternatively you could just drop the LOCALVERSION option indeed)

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Michael Vogt (mvo) wrote :

The issue that snappy is tripping over is that it expects the following toplevel dirs in a kernel snap: "firmware" and "modules". It looks like in this kernel snap both dirs also only provided under "./lib". Please check the reference kernels as an example.

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Michael Vogt (mvo) wrote :

I.e. if you move the two subdirs of "./lib" form your kernel snap to "./" the mounting should work.

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Luke Williams (wililupy) wrote :

That did work by moving the the subdirs to the ./ directory.

Is there a reason why when you build the kernel snap, it doesn't do this by default? Should I create a bug against snapcraft as to why the kernel plugin is building the /lib/modules/`uname -r` directory?

Thank you everyone for the help on this.

John Lenton (chipaca)
affects: ubuntu-image → snapcraft
summary: - custom kernel doesn't mount /lib/modules/`uname -r` in custom image
+ snapcraft kernel plugin puts module and firmware under 15.04-era lib/
+ directory
Revision history for this message
Loïc Minier (lool) wrote :

Trying to build the specific snapcraft.yaml attached to this bug, I wondered where to get extra sources from; I took linux 3.18.25 and applied two patches from this series, and used the config from this:
https://github.com/opencomputeproject/OpenNetworkLinux/tree/master/packages/base/any/kernels/3.18.25/

(Is this correct?)

Revision history for this message
Sergio Schvezov (sergiusens) wrote :

https://github.com/snapcore/snapcraft/pull/1115

Changed in snapcraft:
status: New → In Progress
importance: Undecided → Critical
assignee: nobody → Loïc Minier (lool)
milestone: none → 2.27
status: In Progress → Fix Committed
Sergio Schvezov (sergiusens)
Changed in snapcraft:
status: Fix Committed → Fix Released
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