$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Hexdump.git /var/lib/mock/f45-build-23096-595/root/chroot_tmpdir/scmroot/perl-Devel-Hexdump
Cloning into '/var/lib/mock/f45-build-23096-595/root/chroot_tmpdir/scmroot/perl-Devel-Hexdump'...
$ git fetch origin 0eca53cc9207075d6af50b182544453f84749903:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Hexdump
 * [new ref]         0eca53cc9207075d6af50b182544453f84749903 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0eca53c Perl 5.44 rebuild