$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f38-build-730324-102656/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f38-build-730324-102656/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin 1a5ab518ccbe07bcefe8a0b30be7cc7742f21723:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         1a5ab518ccbe07bcefe8a0b30be7cc7742f21723 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a5ab51 Auto-sync with upstream branch release/2.37/master