bootloader/zipl: Run in target deployment as container if needed

src/libostree/ostree-bootloader-zipl.c

@@ -434,10 +434,19 @@ _ostree_bootloader_zipl_post_bls_sync (OstreeBootloader *bootloader, int bootver
   if (getuid () != 0)
     return TRUE;
 
-  /* Note that unlike the grub2-mkconfig backend, we make no attempt to
-   * chroot().
-   */
-  g_assert (self->sysroot->booted_deployment);
+  // If we're in a booted deployment, we don't need to spawn a container.
+  // Also avoid containerizing if there's no deployments to target, which shouldn't
+  // generally happen.
+  OstreeDeployment *target_deployment;
+  if (self->sysroot->booted_deployment || self->sysroot->deployments->len == 0)
+    {
+      target_deployment = NULL;
+    }
+  else
+    {
+      g_assert_cmpint (self->sysroot->deployments->len, >, 0);
+      target_deployment = self->sysroot->deployments->pdata[0];
+    }
 
   if (!glnx_fstatat_allow_noent (self->sysroot->sysroot_fd, zipl_requires_execute_path, NULL, 0,
                                  error))
@@ -467,9 +476,30 @@ _ostree_bootloader_zipl_post_bls_sync (OstreeBootloader *bootloader, int bootver
   const char *const zipl_argv[]
       = { "zipl", "--secure", (sb_enabled == TRUE) ? "1" : "auto", "-V", NULL };
   int estatus;
-  if (!g_spawn_sync (NULL, (char **)zipl_argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, NULL,
-                     &estatus, error))
-    return FALSE;
+  if (target_deployment != NULL)
+    {
+      g_debug ("executing zipl in deployment root");
+      g_autofree char *deployment_path
+          = ostree_sysroot_get_deployment_dirpath (self->sysroot, target_deployment);
+      glnx_autofd int deployment_dfd = -1;
+      if (!glnx_opendirat (self->sysroot->sysroot_fd, deployment_path, TRUE, &deployment_dfd,
+                           error))
+        return FALSE;
+
+      g_autofree char *sysroot_boot
+          = g_build_filename (gs_file_get_path_cached (self->sysroot->path), "boot", NULL);
+      const char *bwrap_args[] = { "--bind", sysroot_boot, "/boot", NULL };
+      if (!_ostree_sysroot_run_in_deployment (deployment_dfd, bwrap_args, zipl_argv, &estatus, NULL,
+                                              error))
+        return glnx_prefix_error (error, "Failed to invoke zipl");
+    }
+  else
+    {
+      g_debug ("executing zipl from booted system");
+      if (!g_spawn_sync (NULL, (char **)zipl_argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL,
+                         NULL, &estatus, error))
+        return FALSE;
+    }
   if (!g_spawn_check_exit_status (estatus, error))
     return FALSE;
   if (!glnx_unlinkat (self->sysroot->sysroot_fd, zipl_requires_execute_path, 0, error))

src/libostree/ostree-sysroot-deploy.c

@@ -3151,7 +3151,6 @@ get_var_dfd (OstreeSysroot *self, int osdeploy_dfd, OstreeDeployment *deployment
   return glnx_opendirat (base_dfd, base_path, TRUE, ret_fd, error);
 }
 
-#ifdef HAVE_SELINUX
 static void
 child_setup_fchdir (gpointer data)
 {
@@ -3164,9 +3163,10 @@ child_setup_fchdir (gpointer data)
 /*
  * Derived from rpm-ostree's rust/src/bwrap.rs
  */
-static gboolean
-run_in_deployment (int deployment_dfd, const gchar *const *child_argv, gint *exit_status,
-                   gchar **stdout, GError **error)
+gboolean
+_ostree_sysroot_run_in_deployment (int deployment_dfd, const char *const *bwrap_argv,
+                                   const gchar *const *child_argv, gint *exit_status,
+                                   gchar **stdout, GError **error)
 {
   static const gchar *const COMMON_ARGV[] = { "/usr/bin/bwrap",
                                               "--dev",
@@ -3229,6 +3229,11 @@ run_in_deployment (int deployment_dfd, const gchar *const *child_argv, gint *exi
 
   for (char **it = (char **)COMMON_ARGV; it && *it; it++)
     g_ptr_array_add (args, *it);
+  for (char **it = (char **)bwrap_argv; it && *it; it++)
+    g_ptr_array_add (args, *it);
+
+  // Separate bwrap args from child args
+  g_ptr_array_add (args, "--");
 
   for (char **it = (char **)child_argv; it && *it; it++)
     g_ptr_array_add (args, *it);
@@ -3239,6 +3244,7 @@ run_in_deployment (int deployment_dfd, const gchar *const *child_argv, gint *exi
                        (gpointer)(uintptr_t)deployment_dfd, stdout, NULL, exit_status, error);
 }
 
+#ifdef HAVE_SELINUX
 /*
  * Run semodule to check if the module content changed after merging /etc
  * and rebuild the policy if needed.
@@ -3264,7 +3270,8 @@ sysroot_finalize_selinux_policy (int deployment_dfd, GError **error)
    * flag is not supported by semodule.
    */
   static const gchar *const SEMODULE_HELP_ARGV[] = { "semodule", "--help", NULL };
-  if (!run_in_deployment (deployment_dfd, SEMODULE_HELP_ARGV, &exit_status, &stdout, error))
+  if (!_ostree_sysroot_run_in_deployment (deployment_dfd, NULL, SEMODULE_HELP_ARGV, &exit_status,
+                                          &stdout, error))
     return FALSE;
   if (!g_spawn_check_exit_status (exit_status, error))
     return glnx_prefix_error (error, "failed to run semodule");
@@ -3278,7 +3285,8 @@ sysroot_finalize_selinux_policy (int deployment_dfd, GError **error)
 
   ot_journal_print (LOG_INFO, "Refreshing SELinux policy");
   guint64 start_msec = g_get_monotonic_time () / 1000;
-  if (!run_in_deployment (deployment_dfd, SEMODULE_REBUILD_ARGV, &exit_status, NULL, error))
+  if (!_ostree_sysroot_run_in_deployment (deployment_dfd, NULL, SEMODULE_REBUILD_ARGV, &exit_status,
+                                          NULL, error))
     return FALSE;
   guint64 end_msec = g_get_monotonic_time () / 1000;
   ot_journal_print (LOG_INFO, "Refreshed SELinux policy in %" G_GUINT64_FORMAT " ms",

src/libostree/ostree-sysroot-private.h

@@ -150,6 +150,10 @@ gboolean _ostree_sysroot_rmrf_deployment (OstreeSysroot *sysroot, OstreeDeployme
 
 char *_ostree_sysroot_get_runstate_path (OstreeDeployment *deployment, const char *key);
 
+gboolean _ostree_sysroot_run_in_deployment (int deployment_dfd, const char *const *bwrap_argv,
+                                            const gchar *const *child_argv, gint *exit_status,
+                                            gchar **stdout, GError **error);
+
 char *_ostree_sysroot_join_lines (GPtrArray *lines);
 
 gboolean _ostree_sysroot_ensure_boot_fd (OstreeSysroot *self, GError **error);