There is a patch to fix that in branch bug_26057: https://gitweb.torproject.org/user/boklm/tor-browser-build.git/commit/?h=bug_26057&id=78ab93d70e73cf37550f45d6fb8fd61825bc1e95

Before this patch, the filename for the tor component in the nightly build is:

$ ./rbm/rbm showconf tor filename --target torbrowser-linux-x86_64 --target nightly
tor-master-linux-x86_64-a86e6c

After the patch:

$ ./rbm/rbm showconf tor filename --target torbrowser-linux-x86_64 --target nightly
tor-01d729cbfe88-linux-x86_64-13bdaf

We can now see from the filename (which is included in the logs) that the commit used is 01d729cbfe88.

We are doing the same change in the obfs4, sandbox, tor-launcher and torbutton components.

Trac:
Keywords: TorBrowserTeam201805 deleted, TorBrowserTeam201805R, boklm201805 added
Status: new to needs_revision

Trac:
Status: needs_revision to needs_review

Looks good. Merged to master (commit 78ab93d70e73cf37550f45d6fb8fd61825bc1e95).

Trac:
Resolution: N/A to fixed
Status: needs_review to closed