$ git clone -n https://src.fedoraproject.org/rpms/arm-none-eabi-binutils-cs.git /var/lib/mock/f42-build-3272246-41305/root/chroot_tmpdir/scmroot/arm-none-eabi-binutils-cs
Cloning into '/var/lib/mock/f42-build-3272246-41305/root/chroot_tmpdir/scmroot/arm-none-eabi-binutils-cs'...
$ git fetch origin e57bc917a751224b1998b4b9d72c4d2d41c244d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arm-none-eabi-binutils-cs
 * [new ref]         e57bc917a751224b1998b4b9d72c4d2d41c244d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e57bc91 updated to 2.44