$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-Simple.git /var/lib/mock/f45-build-22986-595/root/chroot_tmpdir/scmroot/perl-Date-Simple
Cloning into '/var/lib/mock/f45-build-22986-595/root/chroot_tmpdir/scmroot/perl-Date-Simple'...
$ git fetch origin 2ea2c0ed85c0555c48c0d8a5d4a306b7b19e9ae0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-Simple
 * [new ref]         2ea2c0ed85c0555c48c0d8a5d4a306b7b19e9ae0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ea2c0e Perl 5.44 rebuild