$ git clone -n https://src.fedoraproject.org/rpms/rust-xattr.git /var/lib/mock/f45-build-46237-832/root/chroot_tmpdir/scmroot/rust-xattr
Cloning into '/var/lib/mock/f45-build-46237-832/root/chroot_tmpdir/scmroot/rust-xattr'...
$ git fetch origin 507660c079782969467931bd8ac05714c7cae503:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xattr
 * [new ref]         507660c079782969467931bd8ac05714c7cae503 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 507660c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild