$ git clone -n https://src.fedoraproject.org/rpms/rust-assert_fs.git /var/lib/mock/f39-build-2238204-53558/root/chroot_tmpdir/scmroot/rust-assert_fs
Cloning into '/var/lib/mock/f39-build-2238204-53558/root/chroot_tmpdir/scmroot/rust-assert_fs'...
$ git fetch origin 4b7c337ade1ff05d9c6bebc9f1ef8f019168012f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-assert_fs
 * [new ref]         4b7c337ade1ff05d9c6bebc9f1ef8f019168012f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b7c337 Update to version 1.1.0; Fixes RHBZ#2256018