$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-Firebird.git /var/lib/mock/f41-build-816727-150376/root/chroot_tmpdir/scmroot/perl-DBD-Firebird
Cloning into '/var/lib/mock/f41-build-816727-150376/root/chroot_tmpdir/scmroot/perl-DBD-Firebird'...
$ git fetch origin 24d0769d7fc3d924b67070178e18218d658ff6f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-Firebird
 * [new ref]         24d0769d7fc3d924b67070178e18218d658ff6f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24d0769 Perl 5.40 rebuild