SCM repo: add ignore-projects option

Change-Id: I4468b699fa86d0790dbb01457d2e67e276740940
Signed-off-by: Lucas Dutra Nunes <ldnunes@ossystems.com.br>

jenkins_jobs/modules/scm.py

@@ -573,6 +573,8 @@ def repo(parser, xml_parent, data):
         (optional)
     :arg str manifest-group: Only retrieve those projects in the manifest
         tagged with the provided group name (optional)
+    :arg list(str) ignore-projects: a list of projects in which changes would
+        not be considered to trigger a build when pooling (optional)
     :arg str destination-dir: Location relative to the workspace root to clone
         under (optional)
     :arg str repo-url: custom url to retrieve the repo application (optional)
@@ -645,6 +647,13 @@ def repo(parser, xml_parent, data):
         else:
             xe.text = str(val)
 
+    # ignore-projects does not follow the same pattern of the other parameters,
+    # so process it here:
+    ip = XML.SubElement(scm, 'ignoreProjects', {'class': 'linked-hash-set'})
+    ignored_projects = data.get('ignore-projects', [''])
+    for ignored_project in ignored_projects:
+        XML.SubElement(ip, 'string').text = str(ignored_project)
+
 
 def store(parser, xml_parent, data):
     """yaml: store

tests/macros/fixtures/scm/multi-scms002.xml

@@ -27,6 +27,9 @@
         <noTags>false</noTags>
         <trace>false</trace>
         <showAllChanges>false</showAllChanges>
+        <ignoreProjects class="linked-hash-set">
+          <string/>
+        </ignoreProjects>
       </hudson.plugins.repo.RepoScm>
       <hudson.plugins.git.GitSCM>
         <configVersion>2</configVersion>

tests/scm/fixtures/repo001.xml

@@ -23,5 +23,9 @@
     remote="gerrit" revision="master" />
 </manifest>
 </localManifest>
+    <ignoreProjects class="linked-hash-set">
+      <string>static-project</string>
+      <string>unimportant-project</string>
+    </ignoreProjects>
   </scm>
 </project>

tests/scm/fixtures/repo001.yaml

@@ -4,6 +4,9 @@ scm:
       manifest-branch: stable
       manifest-file: repo.xml
       manifest-group: drivers
+      ignore-projects:
+        - static-project
+        - unimportant-project
       destination-dir: build
       repo-url: https://internal.net/projects/repo
       mirror-dir: ~/git/project/