$ git clone -n https://src.fedoraproject.org/rpms/libunicode.git /var/lib/mock/f39-build-2463994-61444/root/chroot_tmpdir/scmroot/libunicode
Cloning into '/var/lib/mock/f39-build-2463994-61444/root/chroot_tmpdir/scmroot/libunicode'...
$ git fetch origin feb45459f9862fd9eeda8d4156a25e40d5603a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunicode
 * [new ref]         feb45459f9862fd9eeda8d4156a25e40d5603a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at feb4545 update to 0.4.0; add packit config file