$ git clone -n https://src.fedoraproject.org/rpms/arm-none-eabi-gcc-cs.git /var/lib/mock/f38-build-side-42-init-devel-1029887-29708/root/chroot_tmpdir/scmroot/arm-none-eabi-gcc-cs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1029887-29708/root/chroot_tmpdir/scmroot/arm-none-eabi-gcc-cs'...
$ git fetch origin ad49c5b047732b7b7bc212d1b98fab3802e59a1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arm-none-eabi-gcc-cs
 * [new ref]         ad49c5b047732b7b7bc212d1b98fab3802e59a1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad49c5b Backport upstream patches for improved C99 compatibility