$ git clone -n https://src.fedoraproject.org/rpms/perl-constant-defer.git /var/lib/mock/f45-build-27645-625/root/chroot_tmpdir/scmroot/perl-constant-defer
Cloning into '/var/lib/mock/f45-build-27645-625/root/chroot_tmpdir/scmroot/perl-constant-defer'...
$ git fetch origin 8af112b7ae242ea1622ae6084463a208b0e8677b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-constant-defer
 * [new ref]         8af112b7ae242ea1622ae6084463a208b0e8677b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8af112b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild