$ git clone -n https://src.fedoraproject.org/rpms/perl-Sentinel.git /var/lib/mock/f45-build-26180-616/root/chroot_tmpdir/scmroot/perl-Sentinel
Cloning into '/var/lib/mock/f45-build-26180-616/root/chroot_tmpdir/scmroot/perl-Sentinel'...
$ git fetch origin 7233bdcb3d257e68dc626790489786a55a6e68cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sentinel
 * [new ref]         7233bdcb3d257e68dc626790489786a55a6e68cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7233bdc Perl 5.44 rebuild