diffmanifests: Handle Missing Projects in Repo Workspace

By default there are 4 categories in the diffmanifests
api puts the diffs in to - added, removed, changed and unreachable

Example of command - repo diffmanifests 1.xml 2.xml

added - list down the projects present in second manifest but not in
first
removed - list down the projects present in first but not in
second
changed - list down the changes and the differences for each project
unreachable - when it encounters revision value in a project is incorrect

But, when there are projects present in both manifests and could not
find in local workspace where we have cloned the repo(because of
different/subset manifest xml) - this will create unhandled exception

Now we have added a 5th category called 'missing' - where in such
cases it will handle the scenario and print the log for user

Example:
added projects :
        project_2 at revision e6c8a59832c05dc4b6a68cee6bc0feb832181725

removed projects :
        project_1 at revision e6c8a59832c05dc4b6a68cee6bc0feb832181725

changed projects :
        project_3 changed from 3bb890e1286f04e84d505e5db48e0ada89892331 to e434b3736f11537c67590fefadfe4495895e9785

missing projects :
        project_4

Change-Id: I244e8389bff7e95664c29d3dcb61e22308e3a573
Signed-off-by: Shashank Devaraj <shashankkarthik@gmail.com>
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/344774
Reviewed-by: Mike Frysinger <vapier@google.com>

2 files changed, 14 insertions, 1 deletions

diff --git a/manifest_xml.py b/manifest_xml.py
index ea274c76..b7579d5d 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -1940,11 +1940,14 @@ https://gerrit.googlesource.com/git-repo/+/HEAD/docs/manifest-format.md
     fromKeys = sorted(fromProjects.keys())
     toKeys = sorted(toProjects.keys())
 
-    diff = {'added': [], 'removed': [], 'changed': [], 'unreachable': []}
+    diff = {'added': [], 'removed': [], 'missing': [], 'changed': [], 'unreachable': []}
 
     for proj in fromKeys:
       if proj not in toKeys:
         diff['removed'].append(fromProjects[proj])
+      elif not fromProjects[proj].Exists:
+        diff['missing'].append(toProjects[proj])
+        toKeys.remove(proj)
       else:
         fromProj = fromProjects[proj]
         toProj = toProjects[proj]
diff --git a/subcmds/diffmanifests.py b/subcmds/diffmanifests.py
index 0e5f4108..08196ef9 100644
--- a/subcmds/diffmanifests.py
+++ b/subcmds/diffmanifests.py
@@ -118,6 +118,16 @@ synced and their revisions won't be found.
         self.printRevision(project.revisionExpr)
         self.out.nl()
 
+    if diff['missing']:
+      self.out.nl()
+      self.printText('missing projects : \n')
+      self.out.nl()
+      for project in diff['missing']:
+        self.printProject('\t%s' % (project.relpath))
+        self.printText(' at revision ')
+        self.printRevision(project.revisionExpr)
+        self.out.nl()
+
     if diff['changed']:
       self.out.nl()
       self.printText('changed projects : \n')