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libsysprof-analyze: add support for external debug dirs

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The ELF loader can use a set of external debug dirs which will be used to
resolve .gnu_debuglink symbols.
This commit is contained in:
Christian Hergert
2023-05-23 10:35:33 -07:00
parent e8eaae3eca
commit f2a7aa94a2
1 changed files with 36 additions and 3 deletions
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39
src/libsysprof-analyze/sysprof-elf-loader.c
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@ -296,6 +296,29 @@ sysprof_elf_loader_annotate (SysprofElfLoader *self,
}
}
}
if (self->external_debug_dirs != NULL)
{
for (guint i = 0; self->external_debug_dirs[i]; i++)
{
g_autoptr(SysprofElf) debug_link_elf = NULL;
g_autofree char *directory_name = NULL;
g_autofree char *debug_path = NULL;
g_autofree char *container_path = NULL;
const char *debug_dir = self->external_debug_dirs[i];
const char *build_id;
directory_name = g_path_get_dirname (orig_file);
debug_path = g_build_filename (debug_dir, directory_name, debug_link, NULL);
build_id = sysprof_elf_get_build_id (elf);
if ((debug_link_elf = sysprof_elf_loader_load (self, NULL, debug_path, build_id, 0, NULL)))
{
sysprof_elf_set_debug_link_elf (elf, get_deepest_debuglink (debug_link_elf));
return;
}
}
}
}
static gboolean
@ -352,16 +375,26 @@ sysprof_elf_loader_load (SysprofElfLoader *self,
guint64 file_inode,
GError **error)
{
const char * const fallback_paths[2] = { file, NULL };
g_auto(GStrv) paths = NULL;
g_return_val_if_fail (SYSPROF_IS_ELF_LOADER (self), NULL);
g_return_val_if_fail (SYSPROF_IS_MOUNT_NAMESPACE (mount_namespace), NULL);
g_return_val_if_fail (!mount_namespace || SYSPROF_IS_MOUNT_NAMESPACE (mount_namespace), NULL);
/* We must translate the file into a number of paths that may possibly
* locate the file in the case that there are overlays in the mount
* namespace. Each of the paths could be in a lower overlay layer.
*
* To allow for zero-translation, we allow a NULL mount namespace.
* sysprof_elf_loader_annotate() will use that to load from external
* directories for which on additional translation is necessary.
*/
if (!(paths = sysprof_mount_namespace_translate (mount_namespace, file)))
if (mount_namespace == NULL)
paths = g_strdupv ((char **)fallback_paths);
else
paths = sysprof_mount_namespace_translate (mount_namespace, file);
if (paths == NULL)
goto failure;
for (guint i = 0; paths[i]; i++)
@ -407,7 +440,7 @@ sysprof_elf_loader_load (SysprofElfLoader *self,
if (elf != NULL)
{
if ((debug_link = sysprof_elf_get_debug_link (elf)))
if (mount_namespace && (debug_link = sysprof_elf_get_debug_link (elf)))
sysprof_elf_loader_annotate (self, mount_namespace, file, elf, debug_link);
/* If we loaded the ELF, but it doesn't match what this request is looking