$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Brotli.git /var/lib/mock/f45-build-21636-587/root/chroot_tmpdir/scmroot/perl-Alien-Brotli
Cloning into '/var/lib/mock/f45-build-21636-587/root/chroot_tmpdir/scmroot/perl-Alien-Brotli'...
$ git fetch origin 4c6f2ec9e676e1255ca39921c9eaa53b1736afad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-Brotli
 * [new ref]         4c6f2ec9e676e1255ca39921c9eaa53b1736afad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c6f2ec Do not build-require removed Alien::cmake3