$ git clone -n https://src.fedoraproject.org/rpms/rust-capnp.git /var/lib/mock/f39-build-1526164-36059/root/chroot_tmpdir/scmroot/rust-capnp
Cloning into '/var/lib/mock/f39-build-1526164-36059/root/chroot_tmpdir/scmroot/rust-capnp'...
$ git fetch origin f542b6406906c5a4f0d5324998f1dbf3c6d318ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-capnp
 * [new ref]         f542b6406906c5a4f0d5324998f1dbf3c6d318ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f542b64 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild