$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Async.git /var/lib/mock/f43-build-59151173-6571316/root/chroot_tmpdir/scmroot/perl-IO-Async
Cloning into '/var/lib/mock/f43-build-59151173-6571316/root/chroot_tmpdir/scmroot/perl-IO-Async'...
$ git fetch origin 7c07cca59a8f3e887960f98c19add71e5bccd926:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Async
 * [new ref]         7c07cca59a8f3e887960f98c19add71e5bccd926 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c07cca Update to 0.804