[gnome-continuous-yocto/gnomeostree-3.28-rocko: 1477/8267] package_manager.py: Avoid installing an empty package list

[Emmanuele Bassi <ebassi src gnome org>]

commit d183d1e08b819c2d69df85c317c3171a61c8a78d
Author: Mark Hatle <mark hatle windriver com>
Date:   Tue Jul 19 15:42:32 2016 +0800

    package_manager.py: Avoid installing an empty package list
    
    It is possible in an attempt only install, that everything listed is not
    available to be installed.  This will have the effect of clearing the
    package list.  However, we only check for an empty package list at
    the beginning of the function.  We need to also check before running the
    install, otherwise we can fail due to 'error: no package(s) given".
    
    (From OE-Core rev: 9ae6a2830dacb3c335754a6da91bd5cc30546b31)
    
    Signed-off-by: Mark Hatle <mark hatle windriver com>
    Signed-off-by: Mingli Yu <mingli yu windriver com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oe/package_manager.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/meta/lib/oe/package_manager.py b/meta/lib/oe/package_manager.py
index 2004a42..47f6831 100644
--- a/meta/lib/oe/package_manager.py
+++ b/meta/lib/oe/package_manager.py
@@ -1186,6 +1186,9 @@ class RpmPM(PackageManager):
                     new_depends[new_depend] = deps[depend]
                 pkgs = bb.utils.join_deps(new_depends, commasep=True).split(', ')
         pkgs = self._pkg_translate_oe_to_smart(pkgs, attempt_only)
+        if not pkgs:
+            bb.note("There are no packages to install")
+            return
         if not attempt_only:
             bb.note('to be installed: %s' % ' '.join(pkgs))
             cmd = "%s %s install -y %s" % \