[feat] Add script apply_updates.py for pyinstaller bundle

apply_updates.py applies the already downloaded files from the updates
folder and removes all the obsolete files from the bundle. It's meant
to be use by the pyinstaller bundle.

- Resolves: #7342
- Related: #5876

2 files changed, 84 insertions, 0 deletions

diff --git a/changes/feature-7342_apply_updates b/changes/feature-7342_apply_updates
new file mode 100644
index 00000000..df7bd726
--- /dev/null
+++ b/changes/feature-7342_apply_updates
@@ -0,0 +1 @@
+- Added apply_updates.py script for the pyinstaller bundle (Closes: #7342)
diff --git a/pkg/tuf/apply_updates.py b/pkg/tuf/apply_updates.py
new file mode 100644
index 00000000..7b52ef11
--- /dev/null
+++ b/pkg/tuf/apply_updates.py
@@ -0,0 +1,83 @@
+#!/usr/local/bin python
+# -*- coding: utf-8 -*-
+# apply_updates.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Apply downloaded updates to the bundle
+"""
+
+import os
+import os.path
+import shutil
+import tuf.client.updater
+
+
+REPO_DIR = "repo/"
+UPDATES_DIR = "updates/"
+
+
+def update_if_needed():
+    if not os.path.isdir(UPDATES_DIR):
+        print "No updates found"
+        return
+
+    print "Found updates, merging directories before doing anything..."
+    try:
+        remove_obsolete()
+        merge_directories(UPDATES_DIR, ".")
+        shutil.rmtree(UPDATES_DIR)
+    except Exception as e:
+        print "An error has ocurred while updating: " + e.message
+
+
+def remove_obsolete():
+    tuf.conf.repository_directory = REPO_DIR
+    updater = tuf.client.updater.Updater('leap-updater', {})
+    updater.remove_obsolete_targets(".")
+
+
+def merge_directories(src, dest):
+    for root, dirs, files in os.walk(src):
+        if not os.path.exists(root):
+            # It was moved as the dir din't exist in dest
+            continue
+
+        destroot = os.path.join(dest, root[len(src):])
+
+        for f in files:
+            srcpath = os.path.join(root, f)
+            destpath = os.path.join(destroot, f)
+            if os.path.exists(destpath):
+                # FIXME: On windows we can't remove, but we can rename and
+                #        afterwards remove. is that still true with python?
+                #        or was just something specific of our implementation
+                #        with C++?
+                os.remove(destpath)
+            os.rename(srcpath, destpath)
+
+        for d in dirs:
+            srcpath = os.path.join(root, d)
+            destpath = os.path.join(destroot, d)
+
+            if os.path.exists(destpath) and not os.path.isdir(destpath):
+                os.remove(destpath)
+
+            if not os.path.exists(destpath):
+                os.rename(srcpath, destpath)
+
+
+if __name__ == "__main__":
+    update_if_needed()