Ldd can't find libgomp, libgfortran

snapcraft
1

Hi, I have problems with a snap which previously worked without a hitch.

When I start my snapped executable modor using

/snap/volsung/current/modor

then it misses the libgomp library, as tested by investigating it with ldd. Similarly another application in my snapped package misses the libgfortran library.

However, I specifically add both libgomp1 and libgfortran4 as stage packages in my yaml file, and have my main part done after sorting the dependencies. Relevant parts:

parts:
  volsung-dependencies:
    plugin: nil
    stage-packages:
      - libgomp1
      - libgfortran4
  volsung:
    plugin: dump
    source: ./volsung-release.tar.gz
    build-attributes: [keep-execstack]
    override-build: |
      snapcraftctl build
    after:
      - volsung-dependencies

Any suggestions please?

2

this is not how you start a snapped app at all :wink:

you need to define an apps: section in your snapcraft.yaml and then call the app via “snap run <snapname>.<appname>” (if snapname and appname are the same you can use only appname) or via /snap/bin/<snapname>.<appname> (again, the same as above applies if snap and app names are identical) … (note that snapd puts /snap/bin into your PATH, so just <snapname>.<appname> (or just appname for the above case) does usually also work)

the confinement, envrionment, namespaces and interfaces are only applied when you start a snap app this way …

3

@ogra thanks for explanation.

My main problem was that I wanted to start my snap app using an automated cron job on system restart with no user logged in. The /snap/bin/<snapname>.<appname> did not work in this instance but my above method did.

However your start run <snapname>.<appname> appears to be working, I am currently testing it thoroughly. I was not aware of this method before; it would be great if it could be added to

https://snapcraft.io/docs/commands-and-aliases

1 Like
4

@degville can we get some info about snap run <snap>.<appname> into the above doc ?