$ git clone -n https://src.fedoraproject.org/rpms/rust-trybuild.git /var/lib/mock/f40-build-1476631-23795/root/chroot_tmpdir/scmroot/rust-trybuild
Cloning into '/var/lib/mock/f40-build-1476631-23795/root/chroot_tmpdir/scmroot/rust-trybuild'...
$ git fetch origin 0eb90e0105ddfee966cc540d930b0e1fbcb25e11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-trybuild
 * [new ref]         0eb90e0105ddfee966cc540d930b0e1fbcb25e11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0eb90e0 Update to version 1.0.97; Fixes RHBZ#2296132