bitbake: include varflags in checksums

Add a dependency to each variable on a filtered list of its varflags.
This is intended to catch things such as SRC_URI checksums, varflags
controlling extra functionality from classes (e.g. the recently updated
update-alternatives class in OE-Core), etc. and ensure their values
influence the sstate checksums.

There is an exclusion list which needs to be set via bitbake.conf
(BB_SIGNATURE_EXCLUDE_FLAGS), if this is not set then the functionality
is disabled. The existing vardepsexclude mechanism can also be used to
exclude undesired varflags, but they must be fully specified, e.g.:

do_patch[vardepsexclude] += "do_patch[someflag]"

Implements [YOCTO #2517].

(Bitbake rev: 56c1ab18fcaf4ac245dcb412ed55e8e0af07883b)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index daf56770f9..c4b7c3992e 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -108,6 +108,10 @@ class SignatureGeneratorBasic(SignatureGenerator):
                 data = data + dep
                 if dep in lookupcache:
                     var = lookupcache[dep]
+                elif dep[-1] == ']':
+                    vf = dep[:-1].split('[')
+                    var = d.getVarFlag(vf[0], vf[1], False)
+                    lookupcache[dep] = var
                 else:
                     var = d.getVar(dep, False)
                     lookupcache[dep] = var