$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_test.git /var/lib/mock/f38-build-side-43-rust-devel-1415645-31455/root/chroot_tmpdir/scmroot/rust-serde_test
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415645-31455/root/chroot_tmpdir/scmroot/rust-serde_test'...
$ git fetch origin e8f68cc8ee770a241845dc28679ce176040b284d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_test
 * [new ref]         e8f68cc8ee770a241845dc28679ce176040b284d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8f68cc Update to version 1.0.176; Fixes RHBZ#2224133