I'm trying to use snapcraft to build a snap of a Java based gradle project, but coming up short whenever any Gradle plugins are used - whenever it tries to access them, I get something akin to the following error:
* What went wrong:
Error resolving plugin [id: 'com.gradle.build-scan', version: '1.14']
> Could not GET 'https://plugins.gradle.org/api/gradle/2.10/plugin/use/com.gradle.build-scan/1.14'.
> plugins.gradle.org: Name or service not known
It seems like plugins.gradle.org is somehow being blocked, so my initial reaction was that it probably needed to be whitelisted - but I can't see any options for doing so.
Relevant section of the snapcraft yaml file is as follows:
parts:
quelea:
after: [desktop-glib-only]
plugin: gradle
source: .
build: |
export JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"
gradle -Dnightly=true -Dversionsuffix=CI-UNSTABLE clean dist
install: |
unzip dist/quelea-snap.zip -d $SNAPCRAFT_PART_INSTALL/
build-packages:
- unzip
- openjdk-8-jdk
Original answer below, but the root cause of this is that Snapcraft uses a proxy, and Java doesn't use system proxies by default. Adding -Djava.net.useSystemProxies=true as an additional option to gradle fixes the issue.
Original answer:
For self-reference and for anyone else having the issue, it turns out I was following an incorrect example - changing the above to use the "proper" syntax for the gradle plugin (as below) seems to work just fine:
parts:
quelea:
after: [desktop-glib-only]
plugin: gradle
source: .
stage-packages: [default-jre]
gradle-options: [-Dnightly=true, -Dversionsuffix=CI-UNSTABLE, clean, jar]
gradle-output-dir: 'build'
It turns out I was following an incorrect guide previously.