$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-MySQL.git /var/lib/mock/f41-build-816754-150376/root/chroot_tmpdir/scmroot/perl-Crypt-MySQL
Cloning into '/var/lib/mock/f41-build-816754-150376/root/chroot_tmpdir/scmroot/perl-Crypt-MySQL'...
$ git fetch origin 2ecfbcdc1e0bd3a64f6500958ad9dbf044ef6e70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-MySQL
 * [new ref]         2ecfbcdc1e0bd3a64f6500958ad9dbf044ef6e70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ecfbcd Perl 5.40 rebuild