$ git clone -n https://src.fedoraproject.org/rpms/perl-Cwd-Guard.git /var/lib/mock/f45-build-22682-593/root/chroot_tmpdir/scmroot/perl-Cwd-Guard
Cloning into '/var/lib/mock/f45-build-22682-593/root/chroot_tmpdir/scmroot/perl-Cwd-Guard'...
$ git fetch origin 3934ebeb8246dfce50ffad812b5fb8f93df18f6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Cwd-Guard
 * [new ref]         3934ebeb8246dfce50ffad812b5fb8f93df18f6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3934ebe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild