$ git clone -n https://src.fedoraproject.org/rpms/rust-ed25519-compact.git /var/lib/mock/f38-build-side-43-rust-devel-1418725-31459/root/chroot_tmpdir/scmroot/rust-ed25519-compact
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418725-31459/root/chroot_tmpdir/scmroot/rust-ed25519-compact'...
$ git fetch origin 90f650934470b087e41c14d0b8ac6251919ba0a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ed25519-compact
 * [new ref]         90f650934470b087e41c14d0b8ac6251919ba0a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90f6509 Initial import (#2210896)