$ git clone -n https://src.fedoraproject.org/rpms/rust-btrd.git /var/lib/mock/f40-build-2129677-50787/root/chroot_tmpdir/scmroot/rust-btrd
Cloning into '/var/lib/mock/f40-build-2129677-50787/root/chroot_tmpdir/scmroot/rust-btrd'...
$ git fetch origin 04524f59ee05af6e5b1adb65452e652dd56402db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-btrd
 * [new ref]         04524f59ee05af6e5b1adb65452e652dd56402db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04524f5 Bump rustyline dependency to 12