[baobab] Stop scanning when crossing device boundaries, not mount points

[Stefano Facchini <sfacchini src gnome org>]

commit 1d7d1cc4413add96d9259ed0075b95080d9502f5
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Wed Jun 10 23:11:36 2020 +0200

    Stop scanning when crossing device boundaries, not mount points
    
    The previous behavior was: if the EXCLUDE_MOUNTS flag is set, stop scanning
    whenever a mount point is encountered, or any of the paths listed in the
    'excluded-uris' setting; otherwise, scan the directory.
    
    Now the scanner *always* excludes the locations listed in 'excluded-uris'.  If
    the EXCLUDE_MOUNTS flag is set, it stops when a directory is on a different
    unix device.  This is more consistent with other similar tools, and behaves
    better in an OSTree system.
    
    Closes: https://gitlab.gnome.org/GNOME/baobab/-/issues/32

 src/baobab-application.vala | 15 +++------------
 src/baobab-scanner.vala     | 14 +++++---------
 2 files changed, 8 insertions(+), 21 deletions(-)
---
diff --git a/src/baobab-application.vala b/src/baobab-application.vala
index a92bb1c..50492ef 100644
--- a/src/baobab-application.vala
+++ b/src/baobab-application.vala
@@ -62,20 +62,11 @@ namespace Baobab {
 
         public GenericSet<File> get_excluded_locations () {
             var excluded_locations = new GenericSet<File> (File.hash, File.equal);
-            excluded_locations.add (File.new_for_path ("/proc"));
-            excluded_locations.add (File.new_for_path ("/sys"));
-            excluded_locations.add (File.new_for_path ("/selinux"));
 
-            var home = File.new_for_path (Environment.get_home_dir ());
-            excluded_locations.add (home.get_child (".gvfs"));
-
-            var root = File.new_for_path ("/");
             var prefs_settings = new Settings ("org.gnome.baobab.preferences");
-            foreach (var uri in prefs_settings.get_value ("excluded-uris")) {
-                var file = File.new_for_uri ((string) uri);
-                if (!file.equal (root)) {
-                    excluded_locations.add (file);
-                }
+            foreach (var uri in prefs_settings.get_strv ("excluded-uris")) {
+                var file = File.new_for_uri (uri);
+                excluded_locations.add (file);
             }
 
             return excluded_locations;
diff --git a/src/baobab-scanner.vala b/src/baobab-scanner.vala
index 7b9b41b..9db09ea 100644
--- a/src/baobab-scanner.vala
+++ b/src/baobab-scanner.vala
@@ -95,6 +95,7 @@ namespace Baobab {
 
         GenericSet<HardLink> hardlinks;
         GenericSet<File> excluded_locations;
+        uint32 unix_device = 0;
 
         bool successful = false;
 
@@ -171,7 +172,9 @@ namespace Baobab {
         Results? add_directory (File directory, FileInfo info, Results? parent = null) {
             var results_array = new ResultsArray ();
 
-            if (directory in excluded_locations) {
+            var current_unix_device = info.get_attribute_uint32 (FileAttribute.UNIX_DEVICE);
+            if (directory in excluded_locations ||
+                (ScanFlags.EXCLUDE_MOUNTS in scan_flags && current_unix_device != unix_device)) {
                 return null;
             }
 
@@ -267,6 +270,7 @@ namespace Baobab {
             try {
                 var array = new ResultsArray ();
                 var info = directory.query_info (ATTRIBUTES, 0, cancellable);
+                unix_device = info.get_attribute_uint32 (FileAttribute.UNIX_DEVICE);
                 var results = add_directory (directory, info);
                 results.percent = 100.0;
                 array.results += (owned) results;
@@ -443,14 +447,6 @@ namespace Baobab {
 
             excluded_locations = Application.get_default ().get_excluded_locations ();
 
-            if (ScanFlags.EXCLUDE_MOUNTS in flags) {
-                foreach (unowned UnixMountEntry mount in UnixMountEntry.get (null)) {
-                    excluded_locations.add (File.new_for_path (mount.get_mount_path ()));
-                }
-            }
-
-            excluded_locations.remove (directory);
-
             results_queue = new AsyncQueue<ResultsArray> ();
         }
     }