[pitivi] flatpak: Install git-phab and pre-commit in a virtual env

[Thibault Saunier <tsaunier src gnome org>]

commit dfafad8a25cb87b931aa7d8517f9c4192c320f06
Author: Thibault Saunier <tsaunier gnome org>
Date:   Wed Feb 15 21:58:21 2017 -0300

    flatpak: Install git-phab and pre-commit in a virtual env
    
    And activate that env when we setup our dev env
    
    Reviewed-by: Alex Băluț <alexandru balut gmail com>
    Differential Revision: https://phabricator.freedesktop.org/D1663

 .gitignore                   |    1 +
 bin/pitivi-env               |    1 +
 build/flatpak/pitivi-flatpak |   15 +++++++++++++++
 3 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 86cb2f2..74c3ae7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,4 +25,5 @@ help/index.cache
 .bashrc
 *.flatpak-builder/
 build/flatpak/Pitivi.*.json
+build/flatpak/pyvenv/*
 build/devel/
diff --git a/bin/pitivi-env b/bin/pitivi-env
index 78cde0e..2087e81 100755
--- a/bin/pitivi-env
+++ b/bin/pitivi-env
@@ -47,6 +47,7 @@ then
 
     alias pitivi="ptvenv $PITIVI_REPO_DIR/bin/pitivi"
 
+    source $PITIVI_REPO_DIR/build/flatpak/pyvenv/bin/activate
     export PS1="(ptv-flatpak) $PS1"
     export PATH="$FLATPAK_ENVPATH/bin/:$PATH"
 
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 278f3ea..8611e36 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -26,6 +26,7 @@ import shutil
 import subprocess
 import sys
 import tempfile
+import venv
 
 from urllib.parse import urlparse
 from urllib.request import urlretrieve
@@ -539,6 +540,20 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
         else:
             Console.message("Using Pitivi prefix in %s", self.prefix)
 
+        venv_path = os.path.join(self.scriptdir, "pyvenv")
+        activate_script = os.path.join(venv_path, "bin", "activate")
+        if not os.path.isdir(venv_path):
+            print("Installing development tools in a virtual env.")
+            venv.create(venv_path, with_pip=True)
+            subprocess.check_call(
+                "source %s && pip install pre-commit git-phab" % (
+                    activate_script), shell=True)
+
+        if self.update:
+            subprocess.check_call(
+                "source %s && pip install -U pre-commit git-phab" % (
+                    activate_script), shell=True)
+
         if not self.check and not self.update:
             self.run_in_sandbox(*self.args, exit_on_failure=True)