$ git clone -n https://src.fedoraproject.org/rpms/perl-lexical-underscore.git /var/lib/mock/f45-build-27690-625/root/chroot_tmpdir/scmroot/perl-lexical-underscore
Cloning into '/var/lib/mock/f45-build-27690-625/root/chroot_tmpdir/scmroot/perl-lexical-underscore'...
$ git fetch origin 156361bacf1f5657e0ce4bdccbbadfb8408c2854:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-lexical-underscore
 * [new ref]         156361bacf1f5657e0ce4bdccbbadfb8408c2854 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 156361b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild