$ git clone -n https://src.fedoraproject.org/rpms/rust-trycmd.git /var/lib/mock/f40-build-1497707-23863/root/chroot_tmpdir/scmroot/rust-trycmd
Cloning into '/var/lib/mock/f40-build-1497707-23863/root/chroot_tmpdir/scmroot/rust-trycmd'...
$ git fetch origin 1cd43c6f3c3f1e5446ea0c9de397e3cf9c977597:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-trycmd
 * [new ref]         1cd43c6f3c3f1e5446ea0c9de397e3cf9c977597 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cd43c6 Update to version 0.15.4; Fixes RHBZ#2263386