Try all packages when installpkg --optional is used.

Also sort the expanded list of packages so that any failures will
be consistent instead of depending on the randomness of a set().
And add better logging when things fail.

The core issue is that repodata may have packages that match globs, but
they cannot actually be installed (eg. sigrok-firmware). This can cause
*some* of the globbed packages to be installed before hitting the
failure package.

With this change it will log the expanded list of packages if a glob is
used. It will skip any packages that fail to install when using
--optional with the glob, and continue to install the rest.

Related: rhbz#1440417

src/pylorax/ltmpl.py

@@ -570,8 +570,21 @@ class LoraxTemplateRunner(object):
                 for exclude in excludes:
                     pkgnames = {pkgname for pkgname in pkgnames if not fnmatch.fnmatch(pkgname, exclude)}
 
+                # Sort the results so that we have consistent results
+                pkgnames = sorted(pkgnames)
+
+                # If the request is a glob, expand it in the log
+                if any(g for g in ['*','?','.'] if g in p):
+                    logger.info("installpkg: %s expands to %s", p, ",".join(pkgnames))
+
                 for pkgname in pkgnames:
-                    self.dbo.install(pkgname)
+                    try:
+                        self.dbo.install(pkgname)
+                    except Exception as e: # pylint: disable=broad-except
+                        if required:
+                            raise
+                        # Not required, log it and continue processing pkgs
+                        logger.error("installpkg %s failed: %s", pkgname, str(e))
             except Exception as e: # pylint: disable=broad-except
                 logger.error("installpkg %s failed: %s", p, str(e))
                 errors = True