SynoCommunity/spksrc — comment on commit fbaa2d953abb49aff253087c37d40823931b864f
File: spk/transmission/src/installer.sh line 74
By zebulon501:

Take care, /tmp may be small, only 58Mb on my DS211j, (and 250Mb on my DS408). You might fill it during the upgrade and lose all the users settings.