$ git clone -n https://src.fedoraproject.org/rpms/rust-iri-string.git /var/lib/mock/f40-build-1821476-24912/root/chroot_tmpdir/scmroot/rust-iri-string
Cloning into '/var/lib/mock/f40-build-1821476-24912/root/chroot_tmpdir/scmroot/rust-iri-string'...
$ git fetch origin 3e452f0145184abef14a060ce4b8c99479aa2fa6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-iri-string
 * [new ref]         3e452f0145184abef14a060ce4b8c99479aa2fa6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e452f0 Update to version 0.7.2; Fixes RHBZ#2274737