libsysprof: add debuginfod symbolizer

This is based on a debuginfod_client provided by Barnabás Pőcze in !73.
It extends it to use the new task infrastructure to elevate the download
process to the user while loading a capture file.

src/libsysprof/sysprof-debuginfod-task.c

@@ -0,0 +1,131 @@
+/*
+ * sysprof-debuginfod-task.c
+ *
+ * Copyright 2024 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 <glib/gstdio.h>
+#include <glib/gi18n.h>
+
+#include <gio/gio.h>
+
+#include "sysprof-debuginfod-task-private.h"
+
+struct _SysprofDebuginfodTask
+{
+  SysprofDocumentTask parent_instance;
+};
+
+G_DEFINE_FINAL_TYPE (SysprofDebuginfodTask, sysprof_debuginfod_task, SYSPROF_TYPE_DOCUMENT_TASK)
+
+static void
+sysprof_debuginfod_task_class_init (SysprofDebuginfodTaskClass *klass)
+{
+}
+
+static void
+sysprof_debuginfod_task_init (SysprofDebuginfodTask *self)
+{
+}
+
+SysprofDebuginfodTask *
+sysprof_debuginfod_task_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_DEBUGINFOD_TASK, NULL);
+}
+
+static int
+sysprof_debuginfod_task_progress_cb (debuginfod_client *client,
+                                     long               a,
+                                     long               b)
+{
+  SysprofDocumentTask *task = debuginfod_get_user_data (client);
+  double progress;
+
+  g_assert (client != NULL);
+  g_assert (SYSPROF_IS_DEBUGINFOD_TASK (task));
+
+  if (b > 0)
+    progress = (double)a / (double)b;
+  else
+    progress = 0;
+
+  _sysprof_document_task_set_progress (task, progress);
+
+  if (sysprof_document_task_is_cancelled (task))
+    return -1;
+
+  return 0;
+}
+
+SysprofElf *
+sysprof_debuginfod_task_find_debuginfo (SysprofDebuginfodTask  *self,
+                                        debuginfod_client      *client,
+                                        const char             *path,
+                                        const char             *build_id_string,
+                                        GError                **error)
+{
+  g_autoptr(GMappedFile) mapped_file = NULL;
+  g_autoptr(SysprofElf) debuginfo_elf = NULL;
+  g_autofd int fd = -1;
+  char *debuginfo_path = NULL;
+
+  g_return_val_if_fail (SYSPROF_IS_DEBUGINFOD_TASK (self), NULL);
+  g_return_val_if_fail (client != NULL, NULL);
+  g_return_val_if_fail (build_id_string != NULL, NULL);
+
+  debuginfod_set_user_data (client, self);
+  debuginfod_set_progressfn (client, sysprof_debuginfod_task_progress_cb);
+
+  _sysprof_document_task_set_title (SYSPROF_DOCUMENT_TASK (self), _("Downloading Symbols…"));
+  _sysprof_document_task_take_message (SYSPROF_DOCUMENT_TASK (self), g_strdup (path));
+
+  fd = debuginfod_find_debuginfo (client,
+                                  (const unsigned char *)build_id_string, 0,
+                                  &debuginfo_path);
+
+  if (fd < 0)
+    {
+      if (error != NULL)
+        {
+          int errsv = errno;
+          g_set_error_literal (error,
+                               G_IO_ERROR,
+                               g_io_error_from_errno (errsv),
+                               g_strerror (errsv));
+        }
+
+      goto failure;
+    }
+
+  if (!(mapped_file = g_mapped_file_new_from_fd (fd, FALSE, error)))
+    goto failure;
+
+  if (!(debuginfo_elf = sysprof_elf_new (debuginfo_path, g_steal_pointer (&mapped_file), 0, error)))
+    goto failure;
+
+failure:
+  free (debuginfo_path);
+
+  debuginfod_set_user_data (client, NULL);
+  debuginfod_set_progressfn (client, NULL);
+
+  return g_steal_pointer (&debuginfo_elf);
+}