$ git clone -n https://src.fedoraproject.org/rpms/perl-Unix-Syslog.git /var/lib/mock/f45-build-27357-622/root/chroot_tmpdir/scmroot/perl-Unix-Syslog
Cloning into '/var/lib/mock/f45-build-27357-622/root/chroot_tmpdir/scmroot/perl-Unix-Syslog'...
$ git fetch origin 2394e9030eed3196a4c3e3edfe620853148d4481:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unix-Syslog
 * [new ref]         2394e9030eed3196a4c3e3edfe620853148d4481 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2394e90 Perl 5.44 rebuild