$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f42-build-side-1-3583692-46890/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f42-build-side-1-3583692-46890/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin dbed01b45a7751a0a4294cf7c408595cebeabc0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         dbed01b45a7751a0a4294cf7c408595cebeabc0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbed01b Revert "Replace stale files in /usr/sbin with symlinks on unmerged systems"