Update libglnx, do some porting to new APIs

In particular I wanted to start using `GLNX_AUTO_PREFIX_ERROR`.

Update submodule: libglnx

Closes: #893
Approved by: jlebon

libglnx

@@ -1 +1 @@
-Subproject commit 607f1775bb1c626cae1875a957a34802daebe81c
+Subproject commit 7d6a31fb9316ec85d462c26b84fb8fe9ca04ef2b

src/app/rpmostree-builtin-start-daemon.c

@@ -78,18 +78,13 @@ static gboolean
 start_daemon (GDBusConnection *connection,
               GError         **error)
 {
+  GLNX_AUTO_PREFIX_ERROR ("Couldn't start daemon", error);
   rpm_ostree_daemon = g_initable_new (RPMOSTREED_TYPE_DAEMON,
                                       NULL, error,
                                       "connection", connection,
                                       "sysroot-path", opt_sysroot,
                                       NULL);
-  if (!rpm_ostree_daemon)
-    {
-      g_prefix_error (error,  "Couldn't start daemon: ");
-      return FALSE;
-    }
-
-  return TRUE;
+  return rpm_ostree_daemon != NULL;
 }
 
 static void

src/app/rpmostree-dbus-helpers.c

@@ -790,9 +790,9 @@ rpmostree_sort_pkgs_strv (const char *const* pkgs,
         g_ptr_array_add (repo_pkgs, g_strdup (*pkg));
       else
         {
-          glnx_fd_close int fd = open (*pkg, O_RDONLY | O_CLOEXEC);
-          if (fd < 0)
-            return glnx_throw_errno_prefix (error, "can't open '%s'", *pkg);
+          glnx_fd_close int fd = -1;
+          if (!glnx_openat_rdonly (AT_FDCWD, *pkg, TRUE, &fd, error))
+            return FALSE;
 
           int idx = g_unix_fd_list_append (fd_list, fd, error);
           if (idx < 0)

src/libpriv/rpmostree-bwrap.c

@@ -326,19 +326,16 @@ rpmostree_bwrap_run (RpmOstreeBwrap *bwrap,
     /* Add the final NULL */
     g_ptr_array_add (bwrap->argv, NULL);
 
+    const char *errmsg = glnx_strjoina ("Executing bwrap(", bwrap->child_argv0, ")");
+    GLNX_AUTO_PREFIX_ERROR (errmsg, error);
+
     if (!g_spawn_sync (NULL, (char**)bwrap->argv->pdata, (char**) bwrap_env, G_SPAWN_SEARCH_PATH,
                        bwrap_child_setup, bwrap,
                        NULL, NULL, &estatus, error))
-      {
-        g_prefix_error (error, "Executing bwrap(%s): ", bwrap->child_argv0);
       return FALSE;
-      }
     if (!g_spawn_check_exit_status (estatus, error))
-      {
-        g_prefix_error (error, "Executing bwrap(%s): ", bwrap->child_argv0);
       return FALSE;
   }
-  }
 
   return TRUE;
 }

src/libpriv/rpmostree-core.c

@@ -1973,8 +1973,8 @@ break_single_hardlink_at (int           dfd,
 {
   struct stat stbuf;
 
-  if (fstatat (dfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) != 0)
-    return glnx_throw_errno_prefix (error, "fstatat");
+  if (!glnx_fstatat (dfd, path, &stbuf, AT_SYMLINK_NOFOLLOW, error))
+    return FALSE;
 
   if (!S_ISLNK (stbuf.st_mode) && !S_ISREG (stbuf.st_mode))
     return glnx_throw (error, "Unsupported type for entry '%s'", path);
@@ -2011,8 +2011,8 @@ break_single_hardlink_at (int           dfd,
           return FALSE;
         }
 
-      if (renameat (dfd, path_tmp, dfd, path) != 0)
-        return glnx_throw_errno_prefix (error, "rename(%s)", path);
+      if (!glnx_renameat (dfd, path_tmp, dfd, path, error))
+        return FALSE;
     }
 
   return TRUE;
@@ -2394,8 +2394,8 @@ get_package_metainfo (RpmOstreeContext *self,
                       GError **error)
 {
   glnx_fd_close int metadata_fd = -1;
-  if ((metadata_fd = openat (self->tmpdir_fd, path, O_RDONLY | O_CLOEXEC)) < 0)
-    return glnx_throw_errno_prefix (error, "open(%s)", path);
+  if (!glnx_openat_rdonly (self->tmpdir_fd, path, TRUE, &metadata_fd, error))
+    return FALSE;
 
   return rpmostree_unpacker_read_metainfo (metadata_fd, out_header, NULL,
                                            out_fi, error);

src/libpriv/rpmostree-passwd-util.c

@@ -1095,9 +1095,9 @@ rpmostree_passwd_prepare_rpm_layering (int                rootfs_dfd,
       const char *usrlibfiletmp = glnx_strjoina ("usr/lib/", file, ".tmp");
 
       /* Retain the current copies in /etc as backups */
-      if (renameat (rootfs_dfd, usretcfile, rootfs_dfd,
-                    glnx_strjoina (usretcfile, ".rpmostreesave")) < 0)
-        return glnx_throw_errno_prefix (error, "renameat");
+      if (!glnx_renameat (rootfs_dfd, usretcfile, rootfs_dfd,
+                          glnx_strjoina (usretcfile, ".rpmostreesave"), error))
+        return FALSE;
 
       /* Copy /usr/lib/{passwd,group} -> /usr/etc (breaking hardlinks) */
       if (!glnx_file_copy_at (rootfs_dfd, usrlibfile, NULL,
@@ -1111,8 +1111,8 @@ rpmostree_passwd_prepare_rpm_layering (int                rootfs_dfd,
                               GLNX_FILE_COPY_OVERWRITE, cancellable, error))
         return FALSE;
 
-      if (renameat (rootfs_dfd, usrlibfiletmp, rootfs_dfd, usrlibfile) < 0)
-        return glnx_throw_errno_prefix (error, "renameat");
+      if (!glnx_renameat (rootfs_dfd, usrlibfiletmp, rootfs_dfd, usrlibfile, error))
+        return FALSE;
     }
 
   /* And break hardlinks for the shadow files, since we don't have
@@ -1136,8 +1136,8 @@ rpmostree_passwd_prepare_rpm_layering (int                rootfs_dfd,
                               rootfs_dfd, tmp, GLNX_FILE_COPY_OVERWRITE,
                               cancellable, error))
         return FALSE;
-      if (renameat (rootfs_dfd, tmp, rootfs_dfd, src) < 0)
-        return glnx_throw_errno_prefix (error, "renameat");
+      if (!glnx_renameat (rootfs_dfd, tmp, rootfs_dfd, src, error))
+        return FALSE;
     }
 
   return TRUE;

src/libpriv/rpmostree-postprocess.c

@@ -681,11 +681,8 @@ hardlink_recurse (int                src_dfd,
       if (!dent)
         break;
 
-      if (fstatat (dfd_iter.fd, dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0)
-        {
-          glnx_set_error_from_errno (error);
+      if (!glnx_fstatat (dfd_iter.fd, dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW, error))
         return FALSE;
-        }
 
       if (dent->d_type == DT_DIR)
         {

src/libpriv/rpmostree-unpacker.c

@@ -336,9 +336,9 @@ rpmostree_unpacker_new_at (int dfd, const char *path,
                            RpmOstreeUnpackerFlags flags,
                            GError **error)
 {
-  glnx_fd_close int fd = openat (dfd, path, O_RDONLY | O_CLOEXEC | O_NOCTTY);
-  if (fd < 0)
-    return glnx_null_throw_errno_prefix (error, "openat(%s)", path);
+  glnx_fd_close int fd = -1;
+  if (!glnx_openat_rdonly (dfd, path, TRUE, &fd, error))
+    return FALSE;
 
   RpmOstreeUnpacker *ret = rpmostree_unpacker_new_fd (fd, pkg, flags, error);
   if (ret == NULL)

src/libpriv/rpmostree-util.c

@@ -159,12 +159,8 @@ _rpmostree_util_update_checksum_from_file (GChecksum    *checksum,
   glnx_fd_close int fd = -1;
   g_autoptr(GMappedFile) mfile = NULL;
 
-  fd = openat (dfd, path, O_RDONLY | O_CLOEXEC);
-  if (fd < 0)
-    {
-      glnx_set_error_from_errno (error);
+  if (!glnx_openat_rdonly (dfd, path, TRUE, &fd, error))
     return FALSE;
-    }
 
   mfile = g_mapped_file_new_from_fd (fd, FALSE, error);
   if (!mfile)