$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Base.git /var/lib/mock/f40-build-2630442-65666/root/chroot_tmpdir/scmroot/perl-String-Base
Cloning into '/var/lib/mock/f40-build-2630442-65666/root/chroot_tmpdir/scmroot/perl-String-Base'...
$ git fetch origin f29510b76fddb5934e444d3fa598832b528eddf1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Base
 * [new ref]         f29510b76fddb5934e444d3fa598832b528eddf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f29510b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild