Fiddle Production Manual

First make sure you are familar with the design of fiddle by reading the DESIGN doc.

Forcing a build

You may need for force a build on the server, say if you accidentally wiped the mounted drive, or say fiddle is broken and you need to force it to build at HEAD and not wait for that commit to make it into a DEPS rolls.

SSH into skia-fiddle and run:

fiddle_build --force --head --alsologtostderr \
  --depot_tools=/mnt/pd0/depot_tools \
  --fiddle_root=/mnt/pd0/fiddle

After that finishes restart fiddle:

sudo systemctl restart fiddle.service

Or restart Fiddle from the push dashboard.

Debugging fiddle_secwrap.cpp

Highly unlikely to be needed, but if font handling changes, for example, then Skia applications may start trying to read new directories or make exciting new system calls.

If that happens then uncomment the line:

    TRACE_ALL,

in fiddle_secwrap.cpp, then compile and run fiddle_secwrap locally and then run it over the offending exe to determine which calls it is making and then add those to the whitelist.

Alerts

Items below here should include target links from alerts.

Fiddle is failing to build

This usually isn‘t a critical error since Fiddle will only start using a build of Skia if it was successfully built, but this should be addressed so Fiddle doesn’t get too far removed from Skia HEAD.

Search logs for “Failed to build LKGR:” and “Successfully built:”.

Fiddle is failing to sync

This sync is for Fiddle updating a local copy of Skia that's used to look up git hashes. The repo is located at /mnt/pd0/fiddle/skia.

Search logs for “Failed to update skia repo”.

One easy fix is to SSH into the machine and delete the directory and then restart Fiddle, which will rebuild the checkout.