$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-MySQL.git /var/lib/mock/f41-build-1639668-24158/root/chroot_tmpdir/scmroot/perl-DBD-MySQL
Cloning into '/var/lib/mock/f41-build-1639668-24158/root/chroot_tmpdir/scmroot/perl-DBD-MySQL'...
$ git fetch origin 4c88abcaf820c082dc274a6b9db376a6e1981c00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-MySQL
 * [new ref]         4c88abcaf820c082dc274a6b9db376a6e1981c00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c88abc 5.007 bump (rhbz#2295347)