[ostree] sysroot: Port some deployment reading code to fd-relative APIs

[Colin Walters <walters src gnome org>]

commit 9630d06ec7c2163d73c5fb4bdaabc0c289b5fd78
Author: Colin Walters <walters verbum org>
Date:   Tue Mar 10 09:07:59 2015 -0400

    sysroot: Port some deployment reading code to fd-relative APIs
    
    More low hanging fruit in the sysroot department.

 src/libostree/ostree-sysroot-cleanup.c |   47 +++++++++++++---------
 src/libostree/ostree-sysroot-private.h |   12 +++---
 src/libostree/ostree-sysroot.c         |   66 ++++++++++++++------------------
 3 files changed, 63 insertions(+), 62 deletions(-)
---
diff --git a/src/libostree/ostree-sysroot-cleanup.c b/src/libostree/ostree-sysroot-cleanup.c
index 825d6c4..30f1936 100644
--- a/src/libostree/ostree-sysroot-cleanup.c
+++ b/src/libostree/ostree-sysroot-cleanup.c
@@ -292,26 +292,26 @@ cleanup_old_deployments (OstreeSysroot       *self,
                          GError             **error)
 {
   gboolean ret = FALSE;
-  guint32 root_device;
-  guint64 root_inode;
+  struct stat root_stbuf;
   guint i;
-  gs_unref_object GFile *active_root = g_file_new_for_path ("/");
   gs_unref_hashtable GHashTable *active_deployment_dirs = NULL;
   gs_unref_hashtable GHashTable *active_boot_checksums = NULL;
   gs_unref_ptrarray GPtrArray *all_deployment_dirs = NULL;
   gs_unref_ptrarray GPtrArray *all_boot_dirs = NULL;
 
-  if (!_ostree_sysroot_get_devino (active_root, &root_device, &root_inode,
-                                   cancellable, error))
-    goto out;
+  if (stat ("/", &root_stbuf) != 0)
+    {
+      glnx_set_error_from_errno (error);
+      goto out;
+    }
 
-  active_deployment_dirs = g_hash_table_new_full (g_file_hash, (GEqualFunc)g_file_equal, g_object_unref, 
NULL);
+  active_deployment_dirs = g_hash_table_new_full (g_str_hash, (GEqualFunc)g_str_equal, g_free, NULL);
   active_boot_checksums = g_hash_table_new_full (g_str_hash, (GEqualFunc)g_str_equal, g_free, NULL);
 
   for (i = 0; i < self->deployments->len; i++)
     {
       OstreeDeployment *deployment = self->deployments->pdata[i];
-      GFile *deployment_path = ostree_sysroot_get_deployment_directory (self, deployment);
+      char *deployment_path = ostree_sysroot_get_deployment_dirpath (self, deployment);
       char *bootcsum = g_strdup (ostree_deployment_get_bootcsum (deployment));
       /* Transfer ownership */
       g_hash_table_replace (active_deployment_dirs, deployment_path, deployment_path);
@@ -325,29 +325,38 @@ cleanup_old_deployments (OstreeSysroot       *self,
   for (i = 0; i < all_deployment_dirs->len; i++)
     {
       OstreeDeployment *deployment = all_deployment_dirs->pdata[i];
-      gs_unref_object GFile *deployment_path = ostree_sysroot_get_deployment_directory (self, deployment);
-      gs_unref_object GFile *origin_path = ostree_sysroot_get_deployment_origin_path (deployment_path);
+      g_autofree char *deployment_path = ostree_sysroot_get_deployment_dirpath (self, deployment);
+      g_autofree char *origin_relpath = ostree_deployment_get_origin_relpath (deployment);
+
       if (!g_hash_table_lookup (active_deployment_dirs, deployment_path))
         {
-          guint32 device;
-          guint64 inode;
+          struct stat stbuf;
+          glnx_fd_close int deployment_fd = -1;
 
-          if (!_ostree_sysroot_get_devino (deployment_path, &device, &inode,
-                                           cancellable, error))
+          if (!glnx_opendirat (self->sysroot_fd, deployment_path, TRUE,
+                               &deployment_fd, error))
             goto out;
 
+          if (fstat (deployment_fd, &stbuf) != 0)
+            {
+              glnx_set_error_from_errno (error);
+              goto out;
+            }
+
           /* This shouldn't happen, because higher levels should
            * disallow having the booted deployment not in the active
            * deployment list, but let's be extra safe. */
-          if (device == root_device && inode == root_inode)
+          if (stbuf.st_dev == root_stbuf.st_dev &&
+              stbuf.st_ino == root_stbuf.st_ino)
             continue;
 
-          if (!_ostree_linuxfs_alter_immutable_flag (deployment_path, FALSE,
-                                                     cancellable, error))
+          if (!_ostree_linuxfs_fd_alter_immutable_flag (deployment_fd, FALSE,
+                                                        cancellable, error))
             goto out;
-          if (!gs_shutil_rm_rf (deployment_path, cancellable, error))
+          
+          if (!glnx_shutil_rm_rf_at (self->sysroot_fd, deployment_path, cancellable, error))
             goto out;
-          if (!gs_shutil_rm_rf (origin_path, cancellable, error))
+          if (!glnx_shutil_rm_rf_at (self->sysroot_fd, origin_relpath, cancellable, error))
             goto out;
         }
     }
diff --git a/src/libostree/ostree-sysroot-private.h b/src/libostree/ostree-sysroot-private.h
index e7dcef2..03224de 100644
--- a/src/libostree/ostree-sysroot-private.h
+++ b/src/libostree/ostree-sysroot-private.h
@@ -68,12 +68,12 @@ _ostree_sysroot_list_deployment_dirs_for_os (GFile               *osdir,
                                              GCancellable        *cancellable,
                                              GError             **error);
 
-gboolean
-_ostree_sysroot_get_devino (GFile         *path,
-                            guint32       *out_device,
-                            guint64       *out_inode,
-                            GCancellable  *cancellable,
-                            GError       **error);
+char *
+_ostree_sysroot_get_origin_relpath (GFile         *path,
+                                    guint32       *out_device,
+                                    guint64       *out_inode,
+                                    GCancellable  *cancellable,
+                                    GError       **error);
 
 char *_ostree_sysroot_join_lines (GPtrArray  *lines);
 
diff --git a/src/libostree/ostree-sysroot.c b/src/libostree/ostree-sysroot.c
index baa8488..2afc59c 100644
--- a/src/libostree/ostree-sysroot.c
+++ b/src/libostree/ostree-sysroot.c
@@ -191,28 +191,6 @@ ensure_sysroot_fd (OstreeSysroot          *self,
   return TRUE;
 }
 
-gboolean
-_ostree_sysroot_get_devino (GFile         *path,
-                            guint32       *out_device,
-                            guint64       *out_inode,
-                            GCancellable  *cancellable,
-                            GError       **error)
-{
-  gboolean ret = FALSE;
-  gs_unref_object GFileInfo *finfo = g_file_query_info (path, "unix::device,unix::inode",
-                                                        G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
-                                                        cancellable, error);
-
-  if (!finfo)
-    goto out;
-
-  ret = TRUE;
-  *out_device = g_file_info_get_attribute_uint32 (finfo, "unix::device");
-  *out_inode = g_file_info_get_attribute_uint64 (finfo, "unix::inode");
- out:
-  return ret;
-}
-
 /**
  * ostree_sysroot_ensure_initialized:
  * @self: Sysroot
@@ -1009,21 +987,32 @@ find_booted_deployment (OstreeSysroot       *self,
                         GError             **error)
 {
   gboolean ret = FALSE;
-  gs_unref_object GFile *active_root = g_file_new_for_path ("/");
+  struct stat root_stbuf;
+  struct stat self_stbuf;
   gs_unref_object OstreeDeployment *ret_deployment = NULL;
 
-  if (g_file_equal (active_root, self->path))
+  if (stat ("/", &root_stbuf) != 0)
+    {
+      glnx_set_error_from_errno (error);
+      goto out;
+    }
+
+  if (!ensure_sysroot_fd (self, error))
+    goto out;
+
+  if (fstat (self->sysroot_fd, &self_stbuf) != 0)
+    {
+      glnx_set_error_from_errno (error);
+      goto out;
+    }
+
+  if (root_stbuf.st_dev == self_stbuf.st_dev &&
+      root_stbuf.st_ino == self_stbuf.st_ino)
     { 
       guint i;
       const char *bootlink_arg;
       __attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *kernel_args = NULL;
-      guint32 root_device;
-      guint64 root_inode;
       
-      if (!_ostree_sysroot_get_devino (active_root, &root_device, &root_inode,
-                                       cancellable, error))
-        goto out;
-
       if (!parse_kernel_commandline (&kernel_args, cancellable, error))
         goto out;
       
@@ -1033,20 +1022,23 @@ find_booted_deployment (OstreeSysroot       *self,
           for (i = 0; i < deployments->len; i++)
             {
               OstreeDeployment *deployment = deployments->pdata[i];
-              gs_unref_object GFile *deployment_path = ostree_sysroot_get_deployment_directory (self, 
deployment);
-              guint32 device;
-              guint64 inode;
+              g_autofree char *deployment_path = ostree_sysroot_get_deployment_dirpath (self, deployment);
+              struct stat stbuf;
 
-              if (!_ostree_sysroot_get_devino (deployment_path, &device, &inode,
-                                               cancellable, error))
-                goto out;
+              if (fstatat (self->sysroot_fd, deployment_path, &stbuf, 0) != 0)
+                {
+                  glnx_set_error_from_errno (error);
+                  goto out;
+                }
 
-              if (device == root_device && inode == root_inode)
+              if (stbuf.st_dev == root_stbuf.st_dev &&
+                  stbuf.st_ino == root_stbuf.st_ino)
                 {
                   ret_deployment = g_object_ref (deployment);
                   break;
                 }
             }
+
           if (ret_deployment == NULL)
             {
               g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,