Detect if the script runs after creating the virtualenv,
printing the command line commands to enable the virtualenv.

Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
 scripts/sphinx-pre-install | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 5fe3b4a86174..bcd6f7978f8d 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -13,6 +13,8 @@ use strict;
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
+my $virtenv_dir = "sphinx_1.4";
+
 #
 # Static vars
 #
@@ -454,16 +456,22 @@ sub check_needs()
                       which("sphinx-build-3");
        }
        if ($need_sphinx) {
-               my $virtualenv = findprog("virtualenv-3");
-               $virtualenv = findprog("virtualenv") if (!$virtualenv);
-               $virtualenv = "virtualenv" if (!$virtualenv);
+               my $activate = "$virtenv_dir/bin/activate";
+               if (-e "$ENV{'PWD'}/$activate") {
+                       printf "\nNeed to activate virtualenv with:\n";
+                       printf "\t. $activate\n";
+               } else {
+                       my $virtualenv = findprog("virtualenv-3");
+                       $virtualenv = findprog("virtualenv") if (!$virtualenv);
+                       $virtualenv = "virtualenv" if (!$virtualenv);
 
-               printf "\t$virtualenv sphinx_1.4\n";
-               printf "\t. sphinx_1.4/bin/activate\n";
-               printf "\tpip install 'docutils==0.12'\n";
-               printf "\tpip install 'Sphinx==1.4.9'\n";
-               printf "\tpip install sphinx_rtd_theme\n";
-               $need++;
+                       printf "\t$virtualenv $virtenv_dir\n";
+                       printf "\t. $activate\n";
+                       printf "\tpip install 'docutils==0.12'\n";
+                       printf "\tpip install 'Sphinx==1.4.9'\n";
+                       printf "\tpip install sphinx_rtd_theme\n";
+                       $need++;
+               }
        }
        printf "\n";
 
-- 
2.13.3

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