$ git clone -n https://src.fedoraproject.org/rpms/glibc32.git /var/lib/mock/f39-build-2547877-61915/root/chroot_tmpdir/scmroot/glibc32
Cloning into '/var/lib/mock/f39-build-2547877-61915/root/chroot_tmpdir/scmroot/glibc32'...
$ git fetch origin 62eb804a3a8d769b805f1e1304ac267984b2f215:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc32
 * [new ref]         62eb804a3a8d769b805f1e1304ac267984b2f215 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62eb804 Upgrade to glibc 2.38. (#2246731)