conf-files: beef up conf-files.[ch] a bit

This adds fozr new flags:

- If CONF_FILES_DIRECTORY is specified conf_file_list() and friends
  will look for directories only.

- Similar CONF_FILES_REGULAR means we'll look only for regular files.

- If CONF_FILES_BASENAME is specified the resulting list will contain
  only the basenames of all discovered files or directories, not the
  full paths.

- If CONF_FILES_FILTER_MASKED is specified the resulting list will have
  masked entries removed (i.e. those symlinked to /dev/null and
  suchlike)

These four flags are useful for discovering portable service profile
information.

While we are at it, also improve a couple of other things:

- More debug logging

- use path_hash_ops instead of string_hash_ops when putting together the
  path lists

1 files changed, 5 insertions, 1 deletions

diff --git a/src/basic/conf-files.h b/src/basic/conf-files.h
index 2dd1b272c..78d03e6e0 100644
--- a/src/basic/conf-files.h
+++ b/src/basic/conf-files.h
@@ -9,7 +9,11 @@
 ***/
 
 enum {
-        CONF_FILES_EXECUTABLE = 1,
+        CONF_FILES_EXECUTABLE    = 1U << 0,
+        CONF_FILES_REGULAR       = 1U << 1,
+        CONF_FILES_DIRECTORY     = 1U << 2,
+        CONF_FILES_BASENAME      = 1U << 3,
+        CONF_FILES_FILTER_MASKED = 1U << 4,
 };
 
 int conf_files_list(char ***ret, const char *suffix, const char *root, unsigned flags, const char *dir, ...);