[B2G] Sometime reop fetch failed, and need to re-fetch manually

[snowmantw]

This is a bug need to be solved, if we want to automate the building process.

[snowmantw]

These two errors:

error: Exited sync due to fetch errors
Repo sync failed

cause the box can't build anything, even after 5+ retries.

[gasolin]

http://stackoverflow.com/questions/16085722/when-running-repo-sync-error-exited-sync-due-to-fetch-errors

Invoking repo sync -f -j10 did the trick.

As it seems -f or --force-broken flag allows it to recover from network error and more important recover on broken/missing objects.

Maybe we can provide a set of script to run this command

[snowmantw]

I gave up it temporarily and launch a GCE instance to test, and found that the network really affected the building. In foxbox it just failed again and again, and GCE instance would success. This may be a issue we must solve, because I failed at a standard and fast enough network.

[gasolin]

You could check 14644ad if it fix this issue