$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-MySQL.git /var/lib/mock/f42-build-864583-172464/root/chroot_tmpdir/scmroot/perl-DBD-MySQL
Cloning into '/var/lib/mock/f42-build-864583-172464/root/chroot_tmpdir/scmroot/perl-DBD-MySQL'...
$ git fetch origin 4074ab3c7e1e74454f312d6414674511f0818201:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-MySQL
 * [new ref]         4074ab3c7e1e74454f312d6414674511f0818201 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4074ab3 5.010 bump (rhbz#2325333)