[PATCHv2] buildhistory: record tag names and show warning when the same tag corresponds to different revision

[Martin Jansa <martin.jansa@gmail.com>]

* persistent cache records tag-srcrev mappings, but is not shared between builders
* when tag is moved in remote repo, all builders should rebuild the component to
  use the same source, show warning when revision is different than what was used
  in last build

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 meta/classes/buildhistory.bbclass | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 82d0bf8..8c9f794 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -538,24 +538,38 @@ def _get_srcrev_values(d):
             scms.append(u)
 
     autoinc_templ = 'AUTOINC+'
-    dict = {}
+    dict_srcrevs = {}
+    dict_tag_srcrevs = {}
     for scm in scms:
         ud = urldata[scm]
         for name in ud.names:
             rev = ud.method.sortable_revision(scm, ud, d, name)
             if rev.startswith(autoinc_templ):
                 rev = rev[len(autoinc_templ):]
-            dict[name] = rev
-    return dict
+            dict_srcrevs[name] = rev
+            if 'tag' in ud.parm:
+                tag = ud.parm['tag'];
+                key = name+'_'+tag
+                dict_tag_srcrevs[key] = rev
+    return (dict_srcrevs, dict_tag_srcrevs)
 
 python do_write_srcrev() {
     pkghistdir = d.getVar('BUILDHISTORY_DIR_PACKAGE', True)
     srcrevfile = os.path.join(pkghistdir, 'latest_srcrev')
 
-    srcrevs = _get_srcrev_values(d)
+    srcrevs, tag_srcrevs = _get_srcrev_values(d)
     if srcrevs:
         if not os.path.exists(pkghistdir):
             os.makedirs(pkghistdir)
+        old_tag_srcrevs = {}
+        if os.path.exists(srcrevfile):
+            with open(srcrevfile) as f:
+                for line in f:
+                    if line.startswith('# tag_'):
+                        key, value = line.split("=", 1)
+                        key = key.replace('# tag_', '').strip()
+                        value = value.replace('"', '').strip()
+                        old_tag_srcrevs[key] = value
         with open(srcrevfile, 'w') as f:
             orig_srcrev = d.getVar('SRCREV', False) or 'INVALID'
             if orig_srcrev != 'INVALID':
@@ -568,6 +582,13 @@ python do_write_srcrev() {
                     f.write('SRCREV_%s = "%s"\n' % (name, srcrev))
             else:
                 f.write('SRCREV = "%s"\n' % srcrevs.itervalues().next())
+            if len(tag_srcrevs) > 0:
+                for name, srcrev in tag_srcrevs.items():
+                    f.write('# tag_%s = "%s"\n' % (name, srcrev))
+                    if name in old_tag_srcrevs and old_tag_srcrevs[name] != srcrev:
+                        pkg = d.getVar('PN', True)
+                        bb.warn("Revision for tag %s in package %s was changed since last build (from %s to %s)" % (name, pkg, old_tag_srcrevs[name], srcrev))
+
     else:
         if os.path.exists(srcrevfile):
             os.remove(srcrevfile)
-- 
1.8.1.5