[ostree] OstreeGpgVerifier: Take the signed data as a GBytes

[Matthew Barnes <mbarnes src gnome org>]

commit f47693440dd2c418464c9aff60300bcae4e407c0
Author: Matthew Barnes <mbarnes redhat com>
Date:   Mon Mar 16 13:01:55 2015 -0400

    OstreeGpgVerifier: Take the signed data as a GBytes
    
    Similar to c2b01ad.  For some reason I was thinking the commit data
    still needed to be written to disk prior to verifying, but it's just
    another artifact of spawning gpgv2 (predates using GPGME).
    
    Makes for a nice cleanup in fetch_metadata_to_verify_delta_superblock()
    as well.

 src/libostree/ostree-gpg-verifier.c |   25 ++++++++++--------
 src/libostree/ostree-gpg-verifier.h |    2 +-
 src/libostree/ostree-repo-private.h |   14 +++++-----
 src/libostree/ostree-repo-pull.c    |   22 ++--------------
 src/libostree/ostree-repo.c         |   47 +++++++++++++++--------------------
 5 files changed, 45 insertions(+), 65 deletions(-)
---
diff --git a/src/libostree/ostree-gpg-verifier.c b/src/libostree/ostree-gpg-verifier.c
index c473892..5f4189f 100644
--- a/src/libostree/ostree-gpg-verifier.c
+++ b/src/libostree/ostree-gpg-verifier.c
@@ -243,7 +243,7 @@ out:
 
 gboolean
 _ostree_gpg_verifier_check_signature (OstreeGpgVerifier  *self,
-                                      GFile              *file,
+                                      GBytes             *signed_data,
                                       GBytes             *signatures,
                                       gboolean           *out_had_valid_sig,
                                       GCancellable       *cancellable,
@@ -294,17 +294,20 @@ _ostree_gpg_verifier_check_signature (OstreeGpgVerifier  *self,
   if (!override_gpgme_home_dir (gpg_ctx, temp_dir, error))
     goto out;
 
-  {
-    gs_free char *path = g_file_get_path (file);
-    gpg_error = gpgme_data_new_from_file (&data_buffer, path, 1);
+  /* Both the signed data and signature GBytes instances will outlive the
+   * gpgme_data_t structs, so we can safely reuse the GBytes memory buffer
+   * directly and avoid a copy. */
 
-    if (gpg_error != GPG_ERR_NO_ERROR)
-      {
-        gpg_error_to_gio_error (gpg_error, error);
-        g_prefix_error (error, "Unable to read signed text: ");
-        goto out;
-      }
-  }
+  gpg_error = gpgme_data_new_from_mem (&data_buffer,
+                                       g_bytes_get_data (signed_data, NULL),
+                                       g_bytes_get_size (signed_data),
+                                       0 /* do not copy */);
+  if (gpg_error != GPG_ERR_NO_ERROR)
+    {
+      gpg_error_to_gio_error (gpg_error, error);
+      g_prefix_error (error, "Unable to read signed data: ");
+      goto out;
+    }
 
   gpg_error = gpgme_data_new_from_mem (&signature_buffer,
                                        g_bytes_get_data (signatures, NULL),
diff --git a/src/libostree/ostree-gpg-verifier.h b/src/libostree/ostree-gpg-verifier.h
index d3a9994..10b84ee 100644
--- a/src/libostree/ostree-gpg-verifier.h
+++ b/src/libostree/ostree-gpg-verifier.h
@@ -42,7 +42,7 @@ OstreeGpgVerifier *_ostree_gpg_verifier_new (GCancellable   *cancellable,
                                              GError        **error);
 
 gboolean      _ostree_gpg_verifier_check_signature (OstreeGpgVerifier *self,
-                                                    GFile             *file,
+                                                    GBytes            *signed_data,
                                                     GBytes            *signatures,
                                                     gboolean          *had_valid_signature,
                                                     GCancellable      *cancellable,
diff --git a/src/libostree/ostree-repo-private.h b/src/libostree/ostree-repo-private.h
index 3bb4576..9721490 100644
--- a/src/libostree/ostree-repo-private.h
+++ b/src/libostree/ostree-repo-private.h
@@ -186,13 +186,13 @@ _ostree_repo_get_remote_boolean_option (OstreeRepo  *self,
                                         GError     **error);
 
 gboolean
-_ostree_repo_gpg_verify_file_with_metadata (OstreeRepo          *self,
-                                            GFile               *path,
-                                            GVariant            *metadata,
-                                            GFile               *keyringdir,
-                                            GFile               *extra_keyring,
-                                            GCancellable        *cancellable,
-                                            GError             **error);
+_ostree_repo_gpg_verify_with_metadata (OstreeRepo          *self,
+                                       GBytes              *signed_data,
+                                       GVariant            *metadata,
+                                       GFile               *keyringdir,
+                                       GFile               *extra_keyring,
+                                       GCancellable        *cancellable,
+                                       GError             **error);
 
 gboolean
 _ostree_repo_commit_loose_final (OstreeRepo        *self,
diff --git a/src/libostree/ostree-repo-pull.c b/src/libostree/ostree-repo-pull.c
index b1219da..6f7bcb5 100644
--- a/src/libostree/ostree-repo-pull.c
+++ b/src/libostree/ostree-repo-pull.c
@@ -1286,9 +1286,6 @@ fetch_metadata_to_verify_delta_superblock (OtPullData      *pull_data,
   gs_free char *meta_path = _ostree_get_relative_static_delta_detachedmeta_path (from_revision, checksum);
   gs_unref_bytes GBytes *detached_meta_data = NULL;
   SoupURI *target_uri = NULL;
-  gs_unref_object GFile *temp_input_path = NULL;
-  gs_unref_object GOutputStream *temp_input_stream = NULL;
-  gs_unref_object GInputStream *superblock_in = NULL;
   gs_unref_variant GVariant *metadata = NULL;
 
   target_uri = suburi_new (pull_data->base_uri, meta_path, NULL);
@@ -1301,26 +1298,13 @@ fetch_metadata_to_verify_delta_superblock (OtPullData      *pull_data,
       goto out;
     }
 
-  superblock_in = g_memory_input_stream_new_from_bytes (superblock_data);
-
-  if (!gs_file_open_in_tmpdir (pull_data->repo->tmp_dir, 0644,
-                               &temp_input_path, &temp_input_stream,
-                               cancellable, error))
-    goto out;
-
-  if (0 > g_output_stream_splice (temp_input_stream, superblock_in,
-                                  G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
-                                  G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
-                                  cancellable, error))
-    goto out;
-
   metadata = g_variant_new_from_bytes (G_VARIANT_TYPE ("a{sv}"),
                                        detached_meta_data,
                                        FALSE);
 
-  if (!_ostree_repo_gpg_verify_file_with_metadata (pull_data->repo, temp_input_path,
-                                                   metadata, NULL, NULL,
-                                                   cancellable, error))
+  if (!_ostree_repo_gpg_verify_with_metadata (pull_data->repo, superblock_data,
+                                              metadata, NULL, NULL,
+                                              cancellable, error))
     goto out;
 
   ret = TRUE;
diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index 35daa3e..8b0ef70 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -3188,13 +3188,13 @@ ostree_repo_sign_delta (OstreeRepo     *self,
 }
 
 gboolean
-_ostree_repo_gpg_verify_file_with_metadata (OstreeRepo          *self,
-                                            GFile               *path,
-                                            GVariant            *metadata,
-                                            GFile               *keyringdir,
-                                            GFile               *extra_keyring,
-                                            GCancellable        *cancellable,
-                                            GError             **error)
+_ostree_repo_gpg_verify_with_metadata (OstreeRepo          *self,
+                                       GBytes              *signed_data,
+                                       GVariant            *metadata,
+                                       GFile               *keyringdir,
+                                       GFile               *extra_keyring,
+                                       GCancellable        *cancellable,
+                                       GError             **error)
 {
   gboolean ret = FALSE;
   gs_unref_object OstreeGpgVerifier *verifier = NULL;
@@ -3253,7 +3253,7 @@ _ostree_repo_gpg_verify_file_with_metadata (OstreeRepo          *self,
   signatures = g_byte_array_free_to_bytes (buffer);
 
   if (!_ostree_gpg_verifier_check_signature (verifier,
-                                             path,
+                                             signed_data,
                                              signatures,
                                              &had_valid_signature,
                                              cancellable, error))
@@ -3293,26 +3293,19 @@ ostree_repo_verify_commit (OstreeRepo   *self,
 {
   gboolean ret = FALSE;
   gs_unref_variant GVariant *commit_variant = NULL;
-  gs_unref_object GFile *commit_tmp_path = NULL;
   gs_unref_object GFile *keyringdir_ref = NULL;
   gs_unref_variant GVariant *metadata = NULL;
+  gs_unref_bytes GBytes *signed_data = NULL;
   gs_free gchar *commit_filename = NULL;
 
   /* Create a temporary file for the commit */
   if (!ostree_repo_load_variant (self, OSTREE_OBJECT_TYPE_COMMIT,
                                  commit_checksum, &commit_variant,
                                  error))
-    goto out;
-  if (!gs_file_open_in_tmpdir (self->tmp_dir, 0644,
-                               &commit_tmp_path, NULL,
-                               cancellable, error))
-    goto out;
-  if (!g_file_replace_contents (commit_tmp_path,
-                                (char*)g_variant_get_data (commit_variant),
-                                g_variant_get_size (commit_variant),
-                                NULL, FALSE, 0, NULL,
-                                cancellable, error))
-    goto out;
+    {
+      g_prefix_error (error, "Failed to read commit: ");
+      goto out;
+    }
 
   /* Load the metadata */
   if (!ostree_repo_read_commit_detached_metadata (self,
@@ -3324,17 +3317,17 @@ ostree_repo_verify_commit (OstreeRepo   *self,
       g_prefix_error (error, "Failed to read detached metadata: ");
       goto out;
     }
-  
-  if (!_ostree_repo_gpg_verify_file_with_metadata (self,
-                                                   commit_tmp_path, metadata,
-                                                   keyringdir, extra_keyring,
-                                                   cancellable, error))
+
+  signed_data = g_variant_get_data_as_bytes (commit_variant);
+
+  if (!_ostree_repo_gpg_verify_with_metadata (self,
+                                              signed_data, metadata,
+                                              keyringdir, extra_keyring,
+                                              cancellable, error))
     goto out;
   
   ret = TRUE;
 out:
-  if (commit_tmp_path)
-    (void) gs_file_unlink (commit_tmp_path, NULL, NULL);
   return ret;
 }