$ git clone -n https://src.fedoraproject.org/rpms/rust-pango-sys.git /var/lib/mock/f42-build-side-1-3584340-46893/root/chroot_tmpdir/scmroot/rust-pango-sys
Cloning into '/var/lib/mock/f42-build-side-1-3584340-46893/root/chroot_tmpdir/scmroot/rust-pango-sys'...
$ git fetch origin 03ec58bb3821b7d377513dff619d279e57c5b0e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pango-sys
 * [new ref]         03ec58bb3821b7d377513dff619d279e57c5b0e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03ec58b Update to version 0.20.10; Fixes RHBZ#2365879