$ git clone -n https://src.fedoraproject.org/rpms/libunistring1.0.git /var/lib/mock/f45-build-17170-496/root/chroot_tmpdir/scmroot/libunistring1.0
Cloning into '/var/lib/mock/f45-build-17170-496/root/chroot_tmpdir/scmroot/libunistring1.0'...
$ git fetch origin d257e9ba489f29d796ecdaf7687abd1582858e69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunistring1.0
 * [new ref]         d257e9ba489f29d796ecdaf7687abd1582858e69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d257e9b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild