bitbake: siggen.py: Improve taskhash reproducibility

file checksums are part of the data checksummed
to generate the task hash. The list of file checksums
was not ordered.

In this commit we make sure the task hash checksum takes
a list of checksum data that is ordered by unique file name
thus guaranteeing reproducibility.

(Bitbake rev: da5f41996687e18b78d9c9845e621d832115aa1e)

Signed-off-by: Paulo Neves <paulo@myneves.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

bitbake/lib/bb/siggen.py

@@ -331,7 +331,7 @@ class SignatureGeneratorBasic(SignatureGenerator):
         for dep in self.runtaskdeps[tid]:
             data += self.get_unihash(dep)
 
-        for (f, cs) in self.file_checksum_values[tid]:
+        for (f, cs) in sorted(self.file_checksum_values[tid], key=clean_checksum_file_path):
             if cs:
                 if "/./" in f:
                     data += "./" + f.split("/./")[1]
@@ -393,7 +393,7 @@ class SignatureGeneratorBasic(SignatureGenerator):
         if runtime and tid in self.taskhash:
             data['runtaskdeps'] = self.runtaskdeps[tid]
             data['file_checksum_values'] = []
-            for f,cs in self.file_checksum_values[tid]:
+            for f,cs in sorted(self.file_checksum_values[tid], key=clean_checksum_file_path):
                 if "/./" in f:
                     data['file_checksum_values'].append(("./" + f.split("/./")[1], cs))
                 else:
@@ -720,6 +720,12 @@ class SignatureGeneratorTestMulticonfigDepends(SignatureGeneratorBasicHash):
     name = "TestMulticonfigDepends"
     supports_multiconfig_datacaches = True
 
+def clean_checksum_file_path(file_checksum_tuple):
+    f, cs = file_checksum_tuple
+    if "/./" in f:
+        return "./" + f.split("/./")[1]
+    return f
+
 def dump_this_task(outfile, d):
     import bb.parse
     fn = d.getVar("BB_FILENAME")