pull: Add require-static-deltas pull option

For a production release repository, most OS vendors would want
to just always use static deltas.  Add the ability for the pulls to
require it.

(I think I'll also add a summary key for this actually in addition,
 so the repo manager can force it too)

src/libostree/ostree-repo-pull.c

@@ -1765,6 +1765,7 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
   char **override_commit_ids = NULL;
   GSource *update_timeout = NULL;
   gboolean disable_static_deltas = FALSE;
+  gboolean require_static_deltas = FALSE;
 
   if (options)
     {
@@ -1777,6 +1778,7 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
       (void) g_variant_lookup (options, "override-remote-name", "s", &pull_data->remote_name);
       (void) g_variant_lookup (options, "depth", "i", &pull_data->maxdepth);
       (void) g_variant_lookup (options, "disable-static-deltas", "b", &disable_static_deltas);
+      (void) g_variant_lookup (options, "require-static-deltas", "b", &require_static_deltas);
       (void) g_variant_lookup (options, "override-commit-ids", "^a&s", &override_commit_ids);
     }
 
@@ -1787,6 +1789,8 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
   if (dir_to_pull)
     g_return_val_if_fail (dir_to_pull[0] == '/', FALSE);
 
+  g_return_val_if_fail (!(disable_static_deltas && require_static_deltas), FALSE);
+
   pull_data->is_mirror = (flags & OSTREE_REPO_PULL_FLAGS_MIRROR) > 0;
   pull_data->is_commit_only = (flags & OSTREE_REPO_PULL_FLAGS_COMMIT_ONLY) > 0;
 
@@ -1969,6 +1973,13 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
         goto out;
       }
 
+    if (!bytes_summary && require_static_deltas)
+      {
+        g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                     "Fetch configured to require static deltas, but no summary found");
+        goto out;
+      }
+
     if (bytes_summary)
       {
         uri = suburi_new (pull_data->base_uri, "summary.sig", NULL);
@@ -2209,6 +2220,13 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
           
       if (!delta_superblock)
         {
+          if (require_static_deltas)
+            {
+              g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                           "Static deltas required, but none found for %s to %s",
+                           from_revision, to_revision);
+              goto out;
+            }
           g_debug ("no delta superblock for %s-%s", from_revision ? from_revision : "empty", to_revision);
           queue_scan_one_metadata_object (pull_data, to_revision, OSTREE_OBJECT_TYPE_COMMIT, 0);
         }

src/ostree/ot-builtin-pull.c

@@ -31,6 +31,7 @@ static gboolean opt_disable_fsync;
 static gboolean opt_mirror;
 static gboolean opt_commit_only;
 static gboolean opt_disable_static_deltas;
+static gboolean opt_require_static_deltas;
 static char* opt_subpath;
 static int opt_depth = 0;
  
@@ -38,6 +39,7 @@ static GOptionEntry options[] = {
    { "commit-metadata-only", 0, 0, G_OPTION_ARG_NONE, &opt_commit_only, "Fetch only the commit metadata", NULL },
    { "disable-fsync", 0, 0, G_OPTION_ARG_NONE, &opt_disable_fsync, "Do not invoke fsync()", NULL },
    { "disable-static-deltas", 0, 0, G_OPTION_ARG_NONE, &opt_disable_static_deltas, "Do not use static deltas", NULL },
+   { "require-static-deltas", 0, 0, G_OPTION_ARG_NONE, &opt_require_static_deltas, "Require static deltas", NULL },
    { "mirror", 0, 0, G_OPTION_ARG_NONE, &opt_mirror, "Write refs suitable for a mirror", NULL },
    { "subpath", 0, 0, G_OPTION_ARG_STRING, &opt_subpath, "Only pull the provided subpath", NULL },
    { "depth", 0, 0, G_OPTION_ARG_INT, &opt_depth, "Traverse DEPTH parents (-1=infinite) (default: 0)", "DEPTH" },
@@ -175,6 +177,9 @@ ostree_builtin_pull (int argc, char **argv, GCancellable *cancellable, GError **
     g_variant_builder_add (&builder, "{s@v}", "disable-static-deltas",
                            g_variant_new_variant (g_variant_new_boolean (opt_disable_static_deltas)));
 
+    g_variant_builder_add (&builder, "{s@v}", "require-static-deltas",
+                           g_variant_new_variant (g_variant_new_boolean (opt_require_static_deltas)));
+
     if (override_commit_ids)
       g_variant_builder_add (&builder, "{s@v}", "override-commit-ids",
                              g_variant_new_variant (g_variant_new_strv ((const char*const*)override_commit_ids->pdata, override_commit_ids->len)));

tests/pull-test.sh

@@ -106,12 +106,18 @@ cd ..
 rm main-files -rf
 # Generate delta that we'll use
 ${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo static-delta generate main
+prev_rev=$(ostree --repo=ostree-srv/gnomerepo rev-parse main^)
+ostree --repo=ostree-srv/gnomerepo summary -u
 
 cd ${test_tmpdir}
-${CMD_PREFIX} ostree --repo=repo pull origin main
+repo_init
+${CMD_PREFIX} ostree --repo=repo pull origin main@${prev_rev}
+${CMD_PREFIX} ostree --repo=repo pull --require-static-deltas origin main
 ${CMD_PREFIX} ostree --repo=repo fsck
 
 cd ${test_tmpdir}
+repo_init
+${CMD_PREFIX} ostree --repo=repo pull origin main@${prev_rev}
 ${CMD_PREFIX} ostree --repo=repo pull --disable-static-deltas origin main
 ${CMD_PREFIX} ostree --repo=repo fsck
 
@@ -124,6 +130,16 @@ assert_not_has_file baz/saucer
 
 echo "ok static delta"
 
+cd ${test_tmpdir}
+rm ostree-srv/gnomerepo/deltas -rf
+ostree --repo=ostree-srv/gnomerepo summary -u
+repo_init
+if ${CMD_PREFIX} ostree --repo=repo pull --require-static-deltas origin main 2>err.txt; then
+    assert_not_reached "--require-static-deltas unexpectedly succeeded"
+fi
+assert_file_has_content err.txt "deltas required, but none found"
+${CMD_PREFIX} ostree --repo=repo fsck
+
 cd ${test_tmpdir}
 rm main-files -rf
 ${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo checkout main main-files
@@ -134,6 +150,7 @@ cd ..
 rm main-files -rf
 # Generate new delta that we'll use
 ${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo static-delta generate --inline main
+ostree --repo=ostree-srv/gnomerepo summary -u
 
 cd ${test_tmpdir}
 ${CMD_PREFIX} ostree --repo=repo pull origin main
@@ -157,6 +174,7 @@ ${CMD_PREFIX} ostree --repo=${test_tmpdir}/ostree-srv/gnomerepo commit -b main -
 cd ..
 rm main-files -rf
 ${CMD_PREFIX} ostree --repo=ostree-srv/gnomerepo static-delta generate main
+ostree --repo=ostree-srv/gnomerepo summary -u
 
 cd ${test_tmpdir}
 ${CMD_PREFIX} ostree --repo=repo pull origin main