$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f41-build-side-1-3128208-39561/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f41-build-side-1-3128208-39561/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin de1bb2140d4f5e552e7a41834a6cfe51a6904353:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         de1bb2140d4f5e552e7a41834a6cfe51a6904353 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de1bb21 Auto-sync with upstream branch release/2.40/master