$ git clone -n https://src.fedoraproject.org/rpms/perl-B-Hooks-OP-Check-StashChange.git /var/lib/mock/f45-build-21840-588/root/chroot_tmpdir/scmroot/perl-B-Hooks-OP-Check-StashChange
Cloning into '/var/lib/mock/f45-build-21840-588/root/chroot_tmpdir/scmroot/perl-B-Hooks-OP-Check-StashChange'...
$ git fetch origin 757de9f63249c6b9297f1bcebe675f734fc7cdd4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-B-Hooks-OP-Check-StashChange
 * [new ref]         757de9f63249c6b9297f1bcebe675f734fc7cdd4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 757de9f Perl 5.44 rebuild