$ git clone -n https://src.fedoraproject.org/rpms/otter-browser.git /var/lib/mock/f45-build-21237-581/root/chroot_tmpdir/scmroot/otter-browser
Cloning into '/var/lib/mock/f45-build-21237-581/root/chroot_tmpdir/scmroot/otter-browser'...
$ git fetch origin a191af791d355b188f42d82212756da89d0461a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/otter-browser
 * [new ref]         a191af791d355b188f42d82212756da89d0461a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a191af7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild