scm: Add GetAllFiles method.

Will be used by presubmit_support to run checks over all files on a repo.

Bug: 1042324
Change-Id: I872b4eb7f287f3a4b14d753cad73d0c5d7beb00c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2002961
Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

scm.py

@@ -321,6 +321,12 @@ class GIT(object):
                '--name-only', branch + "..." + branch_head]
     return GIT.Capture(command, cwd=cwd).splitlines(False)
 
+  @staticmethod
+  def GetAllFiles(cwd):
+    """Returns the list of all files under revision control."""
+    command = ['-c', 'core.quotePath=false', 'ls-files', '--', '.']
+    return GIT.Capture(command, cwd=cwd).splitlines(False)
+
   @staticmethod
   def GetPatchName(cwd):
     """Constructs a name for this patch."""

tests/scm_unittest.py

@@ -85,10 +85,10 @@ class RealGitTest(fake_repos.FakeReposTestBase):
     self.enabled = self.FAKE_REPOS.set_up_git()
     if self.enabled:
       self.clone_dir = scm.os.path.join(self.FAKE_REPOS.git_base, 'repo_1')
+    else:
+      self.skipTest('git fake repos not available')
 
   def testIsValidRevision(self):
-    if not self.enabled:
-      return
     # Sha1's are [0-9a-z]{32}, so starting with a 'z' or 'r' should always fail.
     self.assertFalse(scm.GIT.IsValidRevision(cwd=self.clone_dir, rev='zebra'))
     self.assertFalse(scm.GIT.IsValidRevision(cwd=self.clone_dir, rev='r123456'))
@@ -98,8 +98,6 @@ class RealGitTest(fake_repos.FakeReposTestBase):
     self.assertTrue(scm.GIT.IsValidRevision(cwd=self.clone_dir, rev='HEAD'))
 
   def testIsAncestor(self):
-    if not self.enabled:
-      return
     self.assertTrue(scm.GIT.IsAncestor(
         self.clone_dir, self.githash('repo_1', 1), self.githash('repo_1', 2)))
     self.assertFalse(scm.GIT.IsAncestor(
@@ -107,6 +105,9 @@ class RealGitTest(fake_repos.FakeReposTestBase):
     self.assertFalse(scm.GIT.IsAncestor(
         self.clone_dir, self.githash('repo_1', 1), 'zebra'))
 
+  def testGetAllFiles(self):
+    self.assertEqual(['DEPS','origin'], scm.GIT.GetAllFiles(self.clone_dir))
+
 
 if __name__ == '__main__':
   if '-v' in sys.argv: