$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f42-build-861775-170352/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f42-build-861775-170352/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin 01e1915f679ca2ab37d94dc4ef803674f750682d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         01e1915f679ca2ab37d94dc4ef803674f750682d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01e1915 Correct patch names (#2327564)