[OE-core] [PATCH] buildhistory: record tag names and show warning when the same tag corresponds to different revision

[Martin Jansa]

* 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 at gmail.com>
---
 meta/classes/buildhistory.bbclass | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 82d0bf8..760075f 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -546,6 +546,10 @@ def _get_srcrev_values(d):
             if rev.startswith(autoinc_templ):
                 rev = rev[len(autoinc_templ):]
             dict[name] = rev
+            if 'tag' in ud.parm:
+                tag = ud.parm['tag'];
+                key = 'tag_'+name+'_'+tag
+                dict[key] = rev
     return dict
 
 python do_write_srcrev() {
@@ -556,8 +560,18 @@ python do_write_srcrev() {
     if srcrevs:
         if not os.path.exists(pkghistdir):
             os.makedirs(pkghistdir)
+        data = {}
+        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('# ', '').strip()
+                        value = value.replace('"', '').strip()
+                        data[key] = value
         with open(srcrevfile, 'w') as f:
             orig_srcrev = d.getVar('SRCREV', False) or 'INVALID'
+            pkg = d.getVar('PN', True)
             if orig_srcrev != 'INVALID':
                 f.write('# SRCREV = "%s"\n' % orig_srcrev)
             if len(srcrevs) > 1:
@@ -565,6 +579,12 @@ python do_write_srcrev() {
                     orig_srcrev = d.getVar('SRCREV_%s' % name, False)
                     if orig_srcrev:
                         f.write('# SRCREV_%s = "%s"\n' % (name, orig_srcrev))
+                    if name.startswith('tag_'):
+                        f.write('# %s = "%s"\n' % (name, srcrev))
+                        if name in data and data[name] != srcrev:
+                            bb.warn("Revision for tag %s in package %s was changed since last build (from %s to %s)" % (name, pkg, data[name], srcrev))
+                        continue
+
                     f.write('SRCREV_%s = "%s"\n' % (name, srcrev))
             else:
                 f.write('SRCREV = "%s"\n' % srcrevs.itervalues().next())
-- 
1.8.1.5