$ git clone -n https://src.fedoraproject.org/rpms/rust-bitflags.git /var/lib/mock/f40-build-2373349-60408/root/chroot_tmpdir/scmroot/rust-bitflags
Cloning into '/var/lib/mock/f40-build-2373349-60408/root/chroot_tmpdir/scmroot/rust-bitflags'...
$ git fetch origin e6a2dcac1595731ded36d9079d61b6b7c9889ba1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitflags
 * [new ref]         e6a2dcac1595731ded36d9079d61b6b7c9889ba1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6a2dca Update to version 2.4.2; Fixes RHBZ#2258661