data/codeparser: Improve handling of contains functions

One of the current frustrations with the sstate checksums is that
code like base_contains('X', 'y',...) adds a full dependency on X
and varies depend even on whitespace changes in X.

This patch adds special handling of the contains functions to expand
the first parameter and check for the flag specified by the second
parameter (assuming its a string).

The result is then appended to the value of the variable with a "Set"
or "Unset" status. If the flag is added/removed, the stored variable
value changes and hence the checksum changes. No dependency on X
is added so it is free to change with regard to other flags or
whitespace.

This code is far from ideal, ideally we'd have properly typed variables
however it fixes a major annoyance of the current checksums and
is of enough value its worth adding in a stopgap solution. It shouldn't
significantly restrict any propely typed variable implementation in
future.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/lib/bb/data.py b/lib/bb/data.py
index bdd1e79e2..3d2c6a497 100644
--- a/lib/bb/data.py
+++ b/lib/bb/data.py
@@ -299,6 +299,21 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
         vardeps = varflags.get("vardeps")
         value = d.getVar(key, False)
 
+        def handle_contains(value, contains, d):
+            newvalue = ""
+            for k in contains:
+                l = (d.getVar(k, True) or "").split()
+                for word in contains[k]:
+                    if word in l:
+                        newvalue += "\n%s{%s} = Set" %  (k, word)
+                    else:
+                        newvalue += "\n%s{%s} = Unset" %  (k, word)
+            if not newvalue:
+                return value
+            if not value:
+                return newvalue
+            return value + newvalue
+
         if "vardepvalue" in varflags:
            value = varflags.get("vardepvalue")
         elif varflags.get("func"):
@@ -309,6 +324,7 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
                     logger.warn("Variable %s contains tabs, please remove these (%s)" % (key, d.getVar("FILE", True)))
                 parser.parse_python(parsedvar.value)
                 deps = deps | parser.references
+                value = handle_contains(value, parser.contains, d)
             else:
                 parsedvar = d.expandWithRefs(value, key)
                 parser = bb.codeparser.ShellParser(key, logger)
@@ -318,10 +334,12 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
                 parser.log.flush()
             deps = deps | parsedvar.references
             deps = deps | (keys & parser.execs) | (keys & parsedvar.execs)
+            value = handle_contains(value, parsedvar.contains, d)
         else:
             parser = d.expandWithRefs(value, key)
             deps |= parser.references
             deps = deps | (keys & parser.execs)
+            value = handle_contains(value, parser.contains, d)
 
         # Add varflags, assuming an exclusion list is set
         if varflagsexcl: