$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f40-build-1527443-23924/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f40-build-1527443-23924/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin 930bcade74b9677304e512683aa28a94db80449a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         930bcade74b9677304e512683aa28a94db80449a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 930bcad Move ANSI_X3.110-1983 support from main package to glibc-gconv-extra.