VBoxTpG: derive the VTG object UUID from the script - #827
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The UUID identifies the tracepoint data of a module, so it has to differ between modules, but there is no need for it to be random: a fresh one on every run makes VBoxDD.so, VBoxRT.so, VBoxVMM.so, VBoxSVC etc differ between two builds of the same sources. Hash the script name and its content into a name-based (RFC-4122 version 3) UUID instead, which keeps it unique per module and stable across rebuilds. See https://reproducible-builds.org/ for why this is good. This patch was done while working on reproducible builds for openSUSE. Signed-off-by: Bernhard M. Wiedemann <virtualboxbmw@lsmod.de>
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The UUID identifies the tracepoint data of a module, so it has to differ between modules, but there is no need for it to be random: a fresh one on every run makes
VBoxDD.so, VBoxRT.so, VBoxVMM.so, VBoxSVCetc differ between two builds of the same sources.Hash the script name and its content into a name-based (RFC-4122 version 3) UUID instead, which keeps it unique per module and stable across rebuilds.
See https://reproducible-builds.org/ for why this is good.
This patch was done while working on reproducible builds for openSUSE.