$ git clone -n https://src.fedoraproject.org/rpms/rust-xattr0.2.git /var/lib/mock/f45-build-46220-832/root/chroot_tmpdir/scmroot/rust-xattr0.2
Cloning into '/var/lib/mock/f45-build-46220-832/root/chroot_tmpdir/scmroot/rust-xattr0.2'...
$ git fetch origin dc558c92bcde78b4be6e4f0153e528691f672caa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xattr0.2
 * [new ref]         dc558c92bcde78b4be6e4f0153e528691f672caa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc558c9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild