$ git clone -n https://src.fedoraproject.org/rpms/bleachbit.git /var/lib/mock/f39-build-1446275-32674/root/chroot_tmpdir/scmroot/bleachbit
Cloning into '/var/lib/mock/f39-build-1446275-32674/root/chroot_tmpdir/scmroot/bleachbit'...
$ git fetch origin 73e2181a7e7cef182e58055e7c117247fb6c191b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bleachbit
 * [new ref]         73e2181a7e7cef182e58055e7c117247fb6c191b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73e2181 RHBZ #2226993