$ git clone -n https://src.fedoraproject.org/rpms/replacer.git /var/lib/mock/f40-build-2129100-50786/root/chroot_tmpdir/scmroot/replacer
Cloning into '/var/lib/mock/f40-build-2129100-50786/root/chroot_tmpdir/scmroot/replacer'...
$ git fetch origin 9b068f3aea12ca370b1b1df10e48ca4406ca8a7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/replacer
 * [new ref]         9b068f3aea12ca370b1b1df10e48ca4406ca8a7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b068f3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild