From 2971f34541f8c3f496fec354080417ce6229c8aa Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Fri, 21 Mar 2025 12:00:14 -0700
Subject: [PATCH] libsysprof/util: add helper to get proc file

This helper allows us to get the file locally or via sysprofd when the
GDBusConnection is provided.

Be careful about use as your local /proc may be different than the
"system" /proc where sysprofd lives.
---
 src/libsysprof/meson.build            |  1 +
 src/libsysprof/sysprof-util-private.h | 31 +++++++++++++
 src/libsysprof/sysprof-util.c         | 67 +++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 src/libsysprof/sysprof-util-private.h
 create mode 100644 src/libsysprof/sysprof-util.c

diff --git a/src/libsysprof/meson.build b/src/libsysprof/meson.build
index 2ae977ca..3a9c53b9 100644
--- a/src/libsysprof/meson.build
+++ b/src/libsysprof/meson.build
@@ -156,6 +156,7 @@ libsysprof_private_sources = [
   'sysprof-process-info.c',
   'sysprof-strings.c',
   'sysprof-symbol-cache.c',
+  'sysprof-util.c',
   'timsort/gtktimsort.c',
 
   gnome.gdbus_codegen('ipc-unwinder',
diff --git a/src/libsysprof/sysprof-util-private.h b/src/libsysprof/sysprof-util-private.h
new file mode 100644
index 00000000..f2ddfaf7
--- /dev/null
+++ b/src/libsysprof/sysprof-util-private.h
@@ -0,0 +1,31 @@
+/*
+ * sysprof-util-private.h
+ *
+ * Copyright 2025 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <libdex.h>
+
+G_BEGIN_DECLS
+
+DexFuture *sysprof_get_proc_file_bytes (GDBusConnection *connection,
+                                        const char      *path);
+
+G_END_DECLS
diff --git a/src/libsysprof/sysprof-util.c b/src/libsysprof/sysprof-util.c
new file mode 100644
index 00000000..9f55dddd
--- /dev/null
+++ b/src/libsysprof/sysprof-util.c
@@ -0,0 +1,67 @@
+/*
+ * sysprof-util.c
+ *
+ * Copyright 2025 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-util-private.h"
+
+DexFuture *
+sysprof_get_proc_file_bytes (GDBusConnection *connection,
+                             const char      *path)
+{
+  g_autoptr(GError) error = NULL;
+
+  dex_return_error_if_fail (!connection || G_IS_DBUS_CONNECTION (connection));
+  dex_return_error_if_fail (path != NULL);
+
+  if (connection != NULL)
+    {
+      g_autoptr(GVariant) reply = NULL;
+      g_autoptr(GBytes) bytes = NULL;
+      const char *contents = NULL;
+
+      if (!(reply = dex_await_variant (dex_dbus_connection_call (connection,
+                                                                 "org.gnome.Sysprof3",
+                                                                 "/org/gnome/Sysprof3",
+                                                                 "org.gnome.Sysprof3.Service",
+                                                                 "GetProcFile",
+                                                                 g_variant_new ("(^ay)", path),
+                                                                 G_VARIANT_TYPE ("(ay)"),
+                                                                 G_DBUS_CALL_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION,
+                                                                 G_MAXINT),
+                                       &error)))
+        return dex_future_new_for_error (g_steal_pointer (&error));
+
+      g_variant_get (reply, "(^&ay)", &contents);
+
+      g_assert (contents != NULL);
+
+      return dex_future_new_take_boxed (G_TYPE_BYTES,
+                                        g_bytes_new_with_free_func (contents, strlen (contents),
+                                                                    (GDestroyNotify) g_variant_unref,
+                                                                    g_steal_pointer (&reply)));
+    }
+  else
+    {
+      g_autoptr(GFile) file = g_file_new_for_path (path);
+      return dex_file_load_contents_bytes (file);
+    }
+}