$ git clone -n https://src.fedoraproject.org/rpms/newscache.git /var/lib/mock/f39-build-1623414-38936/root/chroot_tmpdir/scmroot/newscache
Cloning into '/var/lib/mock/f39-build-1623414-38936/root/chroot_tmpdir/scmroot/newscache'...
$ git fetch origin a3573fa70b5c6109d41b78382b9b3ad6d1d25068:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/newscache
 * [new ref]         a3573fa70b5c6109d41b78382b9b3ad6d1d25068 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3573fa Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild