$ git clone -n https://src.fedoraproject.org/rpms/libicu73.git /var/lib/mock/f40-build-777656-129463/root/chroot_tmpdir/scmroot/libicu73
Cloning into '/var/lib/mock/f40-build-777656-129463/root/chroot_tmpdir/scmroot/libicu73'...
$ git fetch origin 5d9a18b2edf6839e15ea6b0d5055071ed7e84d8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libicu73
 * [new ref]         5d9a18b2edf6839e15ea6b0d5055071ed7e84d8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d9a18b Initial import