$ git clone -n https://src.fedoraproject.org/rpms/rust-libheif-sys.git /var/lib/mock/f40-build-2723348-73099/root/chroot_tmpdir/scmroot/rust-libheif-sys
Cloning into '/var/lib/mock/f40-build-2723348-73099/root/chroot_tmpdir/scmroot/rust-libheif-sys'...
$ git fetch origin faf2cc9632ecf3c46b357fbdf89627c065f68ae2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libheif-sys
 * [new ref]         faf2cc9632ecf3c46b357fbdf89627c065f68ae2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at faf2cc9 Update to version 2.1.0+1.17.4; Fixes RHBZ#2238087