[sysprof] libsysprof: allow disabling the kernel symbol resolver

[Christian Hergert <chergert src gnome org>]

commit f01298ead5b17292b5ad0921629fa6e5dce347c6
Author: Christian Hergert <chergert redhat com>
Date:   Wed Feb 26 10:24:40 2020 -0800

    libsysprof: allow disabling the kernel symbol resolver
    
    The kernel symbol resolver requires access to sysprofd, which might not
    be available in some contexts (such as when no polkit agent is available).
    
    This allows that to continue working by disabling the kernel with the
    user-only setting.

 src/libsysprof/sysprof-symbols-source.c | 31 +++++++++++++++++++++++++++----
 src/libsysprof/sysprof-symbols-source.h |  7 ++++++-
 2 files changed, 33 insertions(+), 5 deletions(-)
---
diff --git a/src/libsysprof/sysprof-symbols-source.c b/src/libsysprof/sysprof-symbols-source.c
index ed6d06f..b4d7d49 100644
--- a/src/libsysprof/sysprof-symbols-source.c
+++ b/src/libsysprof/sysprof-symbols-source.c
@@ -33,6 +33,7 @@ struct _SysprofSymbolsSource
 {
   GObject               parent_instance;
   SysprofCaptureWriter *writer;
+  guint                 user_only : 1;
 };
 
 static void source_iface_init (SysprofSourceInterface *iface);
@@ -93,12 +94,17 @@ sysprof_symbols_source_supplement (SysprofSource        *source,
   if (-1 == (fd = sysprof_memfd_create ("[sysprof-decode]")))
     return;
 
-  kernel = sysprof_kernel_symbol_resolver_new ();
-  native = sysprof_elf_symbol_resolver_new ();
-
   map = sysprof_symbol_map_new ();
-  sysprof_symbol_map_add_resolver (map, kernel);
+
+  native = sysprof_elf_symbol_resolver_new ();
   sysprof_symbol_map_add_resolver (map, native);
+
+  if (!self->user_only)
+    {
+      kernel = sysprof_kernel_symbol_resolver_new ();
+      sysprof_symbol_map_add_resolver (map, kernel);
+    }
+
   sysprof_symbol_map_resolve (map, reader);
   sysprof_symbol_map_serialize (map, fd);
   sysprof_symbol_map_free (map);
@@ -143,3 +149,20 @@ sysprof_symbols_source_new (void)
 {
   return g_object_new (SYSPROF_TYPE_SYMBOLS_SOURCE, NULL);
 }
+
+void
+sysprof_symbols_source_set_user_only (SysprofSymbolsSource *self,
+                                      gboolean              user_only)
+{
+  g_return_if_fail (SYSPROF_IS_SYMBOLS_SOURCE (self));
+
+  self->user_only = !!user_only;
+}
+
+gboolean
+sysprof_symbols_source_get_user_only (SysprofSymbolsSource *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_SYMBOLS_SOURCE (self), FALSE);
+
+  return self->user_only;
+}
diff --git a/src/libsysprof/sysprof-symbols-source.h b/src/libsysprof/sysprof-symbols-source.h
index 22359f9..c78bb3c 100644
--- a/src/libsysprof/sysprof-symbols-source.h
+++ b/src/libsysprof/sysprof-symbols-source.h
@@ -30,6 +30,11 @@ SYSPROF_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (SysprofSymbolsSource, sysprof_symbols_source, SYSPROF, SYMBOLS_SOURCE, GObject)
 
 SYSPROF_AVAILABLE_IN_ALL
-SysprofSource *sysprof_symbols_source_new (void);
+SysprofSource *sysprof_symbols_source_new           (void);
+SYSPROF_AVAILABLE_IN_3_36
+void           sysprof_symbols_source_set_user_only (SysprofSymbolsSource *self,
+                                                     gboolean              user_only);
+SYSPROF_AVAILABLE_IN_3_36
+gboolean       sysprof_symbols_source_get_user_only (SysprofSymbolsSource *self);
 
 G_END_DECLS