$ git clone -n https://src.fedoraproject.org/rpms/rust-cmd_lib_macros.git /var/lib/mock/f42-build-side-1-3533166-46342/root/chroot_tmpdir/scmroot/rust-cmd_lib_macros
Cloning into '/var/lib/mock/f42-build-side-1-3533166-46342/root/chroot_tmpdir/scmroot/rust-cmd_lib_macros'...
$ git fetch origin 2bdf3668826aa0a198b1b13286b0b8437159f9f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cmd_lib_macros
 * [new ref]         2bdf3668826aa0a198b1b13286b0b8437159f9f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2bdf366 Update to version 1.9.5; Fixes RHBZ#2316034