repo can be configured to download from any number of remote git repos.
However when one fails repo doesn't report which one. Example:
Fatal: remote error: Daily ls-remote rate limit exceeded for IP xx.xx.xx.xx
TEST=repo init -q -u https://chromium.googlesource.com/chromiumos/manifest.git
# Apply patch in ./.repo/repo/
# Simulate a git remote error:
sed -i -e 's#chromiumos/docs#chromiumos/XXdocs#' .repo/manifests/full.xml
repo sync --quiet --force-sync docs
# error message now shows the remote URL
Optional test tip: reduce the time.sleep(random(...)) in ./.repo/repo/project.py
Change-Id: I4509383b6a43a8e66064778e8ed612d8a735c8b6
ffb4b89099