gitclone: new 'sparse-checkout' option

slapos/recipe/gitclone.py

@@ -138,6 +138,7 @@ class Recipe(object):
     self.git_command = options.get('git-executable', '')
     if self.git_command == '':
       self.git_command = 'git'
+    self.sparse = options.get('sparse-checkout', '').strip()
     # Set boolean values
     for key in ('develop', 'use-cache', 'ignore-ssl-certificate'):
       setattr(self, key.replace('-', '_'), options.get(key, '').lower() in TRUE_VALUES)
@@ -192,17 +193,30 @@ class Recipe(object):
     git_clone_command = [self.git_command, 'clone',
                 self.repository,
                 self.location]
+    config = []
+    if self.sparse:
+      git_clone_command.append('--no-checkout')
+      config.append('core.sparseCheckout=true')
     if self.branch:
-      git_clone_command.extend(['--branch', self.branch])
-
+      git_clone_command += '--branch', self.branch
     if self.ignore_ssl_certificate:
-      git_clone_command.extend(['--config', 'http.sslVerify=false'])
+      config.append('http.sslVerify=false')
+
+    if config and self.use_cache:
+      raise NotImplementedError
+    for config in config:
+      git_clone_command += '--config', config
 
     try:
       check_call(git_clone_command, stdout=sys.stdout, stderr=sys.stdout)
       if not os.path.exists(self.location):
         raise UserError("Unknown error while cloning repository.")
-      if self.revision:
+      if self.sparse:
+        with open(os.path.join(self.location, '.git',
+                               'info', 'sparse-checkout'), 'w') as f:
+          f.write(self.sparse + '\n')
+        self.gitReset(self.revision)
+      elif self.revision:
         self.gitReset(self.revision)
       if self.use_cache:
         upload_network_cached(os.path.join(self.location, '.git'),