$ git clone -n https://src.fedoraproject.org/rpms/rust-pin-project-internal.git /var/lib/mock/f40-build-2038621-48196/root/chroot_tmpdir/scmroot/rust-pin-project-internal
Cloning into '/var/lib/mock/f40-build-2038621-48196/root/chroot_tmpdir/scmroot/rust-pin-project-internal'...
$ git fetch origin 517c9f3a36dfc76610217b4fb5fc1392403267d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pin-project-internal
 * [new ref]         517c9f3a36dfc76610217b4fb5fc1392403267d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 517c9f3 Update to version 1.1.3; Fixes RHBZ#2229446