$ git clone -n https://src.fedoraproject.org/rpms/perl-Event-Lib.git /var/lib/mock/f45-build-23410-597/root/chroot_tmpdir/scmroot/perl-Event-Lib
Cloning into '/var/lib/mock/f45-build-23410-597/root/chroot_tmpdir/scmroot/perl-Event-Lib'...
$ git fetch origin 5c3f3edc0af06a85027123663f31351157414699:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Event-Lib
 * [new ref]         5c3f3edc0af06a85027123663f31351157414699 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c3f3ed Perl 5.44 rebuild