$ git clone -n https://src.fedoraproject.org/rpms/glibc32.git /var/lib/mock/f39-build-1641560-40194/root/chroot_tmpdir/scmroot/glibc32
Cloning into '/var/lib/mock/f39-build-1641560-40194/root/chroot_tmpdir/scmroot/glibc32'...
$ git fetch origin bc846bc7352df2398d1ced57dc68902e6ea7cc59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc32
 * [new ref]         bc846bc7352df2398d1ced57dc68902e6ea7cc59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc846bc Switch to %baserelease for rpmdev-bumpspec support