Add /rest/project_last_modified route (#506)

The idea is to help to confirm whether a rsync is needed for mirrors

lib/MirrorCache/WebAPI.pm

@@ -182,6 +182,7 @@ sub _setup_webui {
     # $rest_r->get('/project/:name')->to('project#show');
     $rest_r->get('/project/:id')->to('table#list', table => 'Project');
     $rest_r->get('/project/propagation/:project_id')->to('project_propagation#list');
+    $rest_r->get('/project_last_modified')->to('project#last_modified');
     $rest_r->get('/rollout_server/:version')->to('rollout_server#list');
 
     my $rest_operator_auth;

lib/MirrorCache/WebAPI/Controller/Rest/Project.pm

@@ -34,4 +34,13 @@ sub list {
     $self->render(json => $list);
 }
 
+sub last_modified {
+    my ($self) = @_;
+
+    my $name = $self->param("project");
+    my $prj = $self->schema->resultset('Project')->find({ name => $name });
+
+    $self->render(text => $prj->lm, status => 200);
+}
+
 1;

t/environ/14-project-report.sh

@@ -83,6 +83,10 @@ $mc/sql_test 4 == "select file_cnt from project where path = '/project1'"
 $mc/sql_test 2 == "select file_cnt from project where path = '/project2/folder1'"
 $mc/sql_test 13 == "select size from project where path = '/project2/folder2'"
 
+lm=$($mc/curl /rest/project_last_modified?project=proj1)
+
+test "$lm" == "$(date +%s -r $mc/dt/project1/folder2/file1.1.dat)"
+
 $mc/curl /report/mirrors | tidy --drop-empty-elements no | \
    grep -A4 -F '<div class="repo">' | \
    grep -A2 -F '"http://127.0.0.1:1304/project2/folder2">' | \