Remote build fails to resolve 'services.gradle.org'

snapcraft
1

Hey folks,

I’m aware there is the ‘gradle’ plugin, but it’s not available with ‘base22’, so I’m invoking ./gradlew directly and build fails with ‘java.net.UnknownHostException: services.gradle.org’ when Gradle tries to download its distribution.

Any help would be appreciated.

Thanks!

2
  • Can you post your snapcraft.yaml?
  • Does it work when you build locally?

I know that some protocols do not work inside the Launchpad remote-build environment (git:// for example).

3

there are also proxies involved that you might need to hand through to the actual build system like in:

5

@mr_cal , local builds complete just fine, that host is unresolved only when building on Launchpad.

name: dogcat
base: core22
...

architectures:
  - build-on: amd64
  - build-on: arm64

apps:
  dogcat:
    command: dogcat.kexe
    plugs:
      - adb-support
      - process-control
    environment:
      PATH: $SNAP/usr/lib/android-sdk/platform-tools:$PATH
      LD_LIBRARY_PATH: $LD_LIBRARY_PATH:$SNAP/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/android/

parts:
  dogcat:
    plugin: nil
    source: https://github.com/NorseDreki/dogcat
    source-type: git
    source-branch: main
    override-build: |
      echo $CRAFT_ARCH_BUILD_FOR
      if [[ "$CRAFT_ARCH_BUILD_FOR" == "amd64" ]]
      then
        ./gradlew linkReleaseExecutableNativeLinuxX64 -Djava.net.useSystemProxies=true \
        && mv build/bin/nativeLinuxX64/releaseExecutable/dogcat.kexe $SNAPCRAFT_STAGE
      fi
      if [[ "$CRAFT_ARCH_BUILD_FOR" == "arm64" ]]
      then
        ./gradlew linkReleaseExecutableNativeLinuxArm64 -Djava.net.useSystemProxies=true \
        && mv build/bin/nativeLinuxArm64/releaseExecutable/dogcat.kexe $SNAPCRAFT_STAGE
      fi
    override-stage: |
      craftctl default
      mv dogcat.kexe $SNAPCRAFT_PRIME
    build-packages:
      - openjdk-17-jre-headless
      - libncurses-dev
    stage-packages:
      - libncursesw6
      - adb
6

Trying to favour proxies by passing -Djava.net.useSystemProxies=true to the command which accesses services.gradle.org, but it doesn’t seem to help.

7

Interesting, it does look like a launchpad-specific connection issue. It’s unfortunate that -Djava.net.useSystemProxies=true isn’t working, as seems like it was successful for other users in Services.gradle.org seems blocked on automated build

8

Looks like this option works only if the gradle plugin is applied which I cannot do since I’m relying on core22 which doesn’t support that gradle plugin.

I wanted to use Launchpad to build for the Arm64 architecture which I’m not in possesion of, seems I need to find it elsewhere…

9

I was able to put right incantations in place and make Gradle pick up proxy available in environment.

Leaving my solution if anyone ever gets stuck on this:

https_proxy_host=$(echo $https_proxy | cut -d'/' -f3 | cut -d':' -f1)
https_proxy_port=$(echo $https_proxy | cut -d'/' -f3 | cut -d':' -f2)
gradle_opts="-Dhttp.proxyHost=$https_proxy_host -Dhttp.proxyPort=$https_proxy_port -Dhttps.proxyHost=$https_proxy_host -Dhttps.proxyPort=$https_proxy_port"

gradle $gradle_opts assemble
3 Likes
10

This works well if the server builds the snap, but locally not:

/bin/bash: line 59: https_proxy: unbound variable
++ cut -d/ -f3
++ cut -d: -f1
+ https_proxy_host=
'override-build' in part 'geogebra-discovery' failed with code 1.
Review the scriptlet and make sure it's correct.

Anyway, this is okay for a temporary solution, thanks!

1 Like