$ git clone -n https://src.fedoraproject.org/rpms/samdump2.git /var/lib/mock/f45-build-35554-696/root/chroot_tmpdir/scmroot/samdump2
Cloning into '/var/lib/mock/f45-build-35554-696/root/chroot_tmpdir/scmroot/samdump2'...
$ git fetch origin 177ce0d7767dd223ab498e8b4a692ef4720dba1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/samdump2
 * [new ref]         177ce0d7767dd223ab498e8b4a692ef4720dba1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 177ce0d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild