Guix CI "No space left on device"

[Greg Hogan]

icedtea-3.19.0 fails to build with ...
  http://ci.guix.gnu.org/build/1331007/details

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repacking 
/gnu/store/cyxfl45c31dg84spwkazadnmn2c94rak-icedtea-3.19.0-jdk/lib/jconsole.jar
java.io.IOException: No space left on device
        at java.io.FileOutputStream.writeBytes(Native Method)
        at java.io.FileOutputStream.write(FileOutputStream.java:345)
        at sun.tools.jar.Main.copy(Main.java:823)
        at sun.tools.jar.Main.copy(Main.java:854)
        at sun.tools.jar.Main.extractFile(Main.java:1012)
        at sun.tools.jar.Main.extract(Main.java:924)
        at sun.tools.jar.Main.run(Main.java:264)
        at sun.tools.jar.Main.main(Main.java:1231)
error: in phase 'strip-jar-timestamps': uncaught exception:
%exception #<&invoke-error program: "jar" arguments: ("xf"
"/gnu/store/cyxfl45c31dg84spwkazadnmn2c94rak-icedtea-3.19.0-jdk/lib/jconsole.jar")
exit-status: 1 term-signal: #f stop-signal: #f>
phase `strip-jar-timestamps' failed after 18.7 seconds
command "jar" "xf"
"/gnu/store/cyxfl45c31dg84spwkazadnmn2c94rak-icedtea-3.19.0-jdk/lib/jconsole.jar"
failed with status 1
note: build failure may have been caused by lack of free disk space
builder for `/gnu/store/x4d9c7crnzn17pw8ahxjl5jc6jjdbyn4-icedtea-3.19.0.drv'
failed with exit code 1
@ build-failed /gnu/store/x4d9c7crnzn17pw8ahxjl5jc6jjdbyn4-icedtea-3.19.0.drv
- 1 builder for
`/gnu/store/x4d9c7crnzn17pw8ahxjl5jc6jjdbyn4-icedtea-3.19.0.drv'
failed with exit code 1
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