$ git clone -n https://src.fedoraproject.org/rpms/rust-git2_0.17.git /var/lib/mock/f40-build-2373528-60409/root/chroot_tmpdir/scmroot/rust-git2_0.17
Cloning into '/var/lib/mock/f40-build-2373528-60409/root/chroot_tmpdir/scmroot/rust-git2_0.17'...
$ git fetch origin ae4215a60b9d0a47064f6e2692a5c09be8fc6e7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git2_0.17
 * [new ref]         ae4215a60b9d0a47064f6e2692a5c09be8fc6e7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae4215a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild