$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f42-build-3496585-45906/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f42-build-3496585-45906/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin 53c51c5e856c3327795fdd0c570d5188e5ec1208:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         53c51c5e856c3327795fdd0c570d5188e5ec1208 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53c51c5 Update riscv64 handling