fixup! Add referred parts' hash strings in __buildout_signature__, that...

fixup! Add referred parts' hash strings in __buildout_signature__, that invokes rebuild of a part when one of its (recursive) dependencies are modified.

Parts are installed/updated in this order now.

src/zc/buildout/buildout.txt

@@ -2599,7 +2599,6 @@ Now, if we run the buildout without the install command::
 
     >>> print_(system(buildout), end='')
     Develop: '/sample-buildout/recipes'
-    Uninstalling d4.
     Uninstalling d2.
     Uninstalling d1.
     Uninstalling debug.
@@ -2609,8 +2608,7 @@ Now, if we run the buildout without the install command::
     Installing d2.
     d2: Creating directory data2
     Updating d3.
-    Installing d4.
-    d4: Creating directory data2-extra
+    Updating d4.
 
 We see the output of the debug recipe, and that ``data2`` was created.  We
 also see that ``d1`` and ``d2`` have gone away::

[Julien Muchembled]

Arg this is a diff I analyzed in the past but I don't remember the outcome.

[Julien Muchembled]

Huh, it looks like my reply disappeared. I asked whether the test was already failing before this MR and if the diff is caused by a change in this MR.

[Jérome Perrin]

yes, this failures is present in https://www.erp5.com/test_result_module/20200909-BD225A4A/2

----------------------------------------------------------------------
File "/srv/slapgrid/slappart9/srv/testnode/ddv/inst/test0-0/parts/slapos.buildout-repository/src/zc/buildout/buildout.txt", line 2600, in buildout.txt
Failed example:
print_(system(buildout), end='')
Expected:
Develop: '/sample-buildout/recipes'
Uninstalling d4.
Uninstalling d2.
Uninstalling d1.
Uninstalling debug.
Installing debug.
recipe recipes:debug
x 1
Installing d2.
d2: Creating directory data2
Updating d3.
Installing d4.
d4: Creating directory data2-extra
Got:
Develop: '/sample-buildout/recipes'
Uninstalling d2.
Uninstalling d1.
Uninstalling debug.
Installing debug.
recipe recipes:debug
x 1
Installing d2.
d2: Creating directory data2
Updating d3.
Updating d4.

[Jérome Perrin]

It's not a difference from the changes in !21 (merged) , it was also failing before. Here we are just repairing this test that was already failing.

[Julien Muchembled]

I found back my comment about the failure and reworded your commit.

[Jérome Perrin]

Good, I saw the amended commit message. Thanks !