Recent changes in ChromeOS Infra to ensure we're reading from
snapshot manifests properly have exposed several bugs in our
assumptions about manifest files. Mainly that the revision field
for a project does _not_ have to refer to a ref, it can just be
a commit hash.
Several places assume that the revision field can be parsed as a
ref to get the branch the project is on, which isn't true. To fix
this we need to be able to look at the upstream and dest-branch
attributes of the repo, so we expose them through the environment
variables set in `repo forall`.
Test: manual 'repo forall' run
Bug: https://crbug.com/1032441
Change-Id: I2c039e0f4b2e0f430602932e91b782edb6f9b1ed
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/263132
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Sean McAllister <smcallis@google.com>
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