$ git clone -n https://src.fedoraproject.org/rpms/perl-Env-C.git /var/lib/mock/f41-build-815873-149783/root/chroot_tmpdir/scmroot/perl-Env-C
Cloning into '/var/lib/mock/f41-build-815873-149783/root/chroot_tmpdir/scmroot/perl-Env-C'...
$ git fetch origin 45d620ca546f52bf3aed00fa6bfe5400079edde0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Env-C
 * [new ref]         45d620ca546f52bf3aed00fa6bfe5400079edde0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45d620c Perl 5.40 rebuild