ostree/src/libostree/ostree-fetcher-util.c

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
 *
 * Copyright (C) 2017 Colin Walters <walters@verbum.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <gio/gfiledescriptorbased.h>
#include <gio/gunixoutputstream.h>

#ifdef HAVE_LIBSYSTEMD
#include <systemd/sd-journal.h>
#endif

#include "ostree-fetcher-util.h"
#include "otutil.h"

typedef struct
{
  GBytes          *result_buf;
  gboolean         done;
  GError         **error;
}
  FetchUriSyncData;

static void
fetch_uri_sync_on_complete (GObject        *object,
                            GAsyncResult   *result,
                            gpointer        user_data)
{
  FetchUriSyncData *data = user_data;

  (void)_ostree_fetcher_request_to_membuf_finish ((OstreeFetcher*)object,
                                                  result, &data->result_buf,
                                                  data->error);
  data->done = TRUE;
}

gboolean
_ostree_fetcher_mirrored_request_to_membuf (OstreeFetcher  *fetcher,
                                            GPtrArray     *mirrorlist,
                                            const char     *filename,
                                            gboolean        add_nul,
                                            gboolean        allow_noent,
                                            GBytes         **out_contents,
                                            guint64        max_size,
                                            GCancellable   *cancellable,
                                            GError         **error)
{
  gboolean ret = FALSE;
  g_autoptr(GMainContext) mainctx = NULL;
  FetchUriSyncData data;
  g_assert (error != NULL);

  memset (&data, 0, sizeof (data));

  if (g_cancellable_set_error_if_cancelled (cancellable, error))
    return FALSE;

  mainctx = g_main_context_new ();
  g_main_context_push_thread_default (mainctx);

  data.done = FALSE;
  data.error = error;

  _ostree_fetcher_request_to_membuf (fetcher, mirrorlist, filename,
                                     add_nul ? OSTREE_FETCHER_REQUEST_NUL_TERMINATION : 0,
                                     max_size, OSTREE_FETCHER_DEFAULT_PRIORITY,
                                     cancellable, fetch_uri_sync_on_complete, &data);
  while (!data.done)
    g_main_context_iteration (mainctx, TRUE);

  if (!data.result_buf)
    {
      if (allow_noent)
        {
          if (g_error_matches (*error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
            {
              g_clear_error (error);
              ret = TRUE;
              *out_contents = NULL;
            }
        }
      goto out;
    }

  ret = TRUE;
  *out_contents = g_steal_pointer (&data.result_buf);
 out:
  if (mainctx)
    g_main_context_pop_thread_default (mainctx);
  g_clear_pointer (&data.result_buf, (GDestroyNotify)g_bytes_unref);
  return ret;
}

/* Helper for callers who just want to fetch single one-off URIs */
gboolean
_ostree_fetcher_request_uri_to_membuf (OstreeFetcher  *fetcher,
                                       OstreeFetcherURI *uri,
                                       gboolean        add_nul,
                                       gboolean        allow_noent,
                                       GBytes         **out_contents,
                                       guint64        max_size,
                                       GCancellable   *cancellable,
                                       GError         **error)
{
  g_autoptr(GPtrArray) mirrorlist = g_ptr_array_new ();
  g_ptr_array_add (mirrorlist, uri); /* no transfer */
  return _ostree_fetcher_mirrored_request_to_membuf (fetcher, mirrorlist, NULL,
                                                     add_nul, allow_noent,
                                                     out_contents, max_size,
                                                     cancellable, error);
}

#define OSTREE_HTTP_FAILURE_ID SD_ID128_MAKE(f0,2b,ce,89,a5,4e,4e,fa,b3,a9,4a,79,7d,26,20,4a)

void
_ostree_fetcher_journal_failure (const char *remote_name,
                                 const char *url,
                                 const char *msg)
{
#ifdef HAVE_LIBSYSTEMD
  /* Sanity - we don't want to log this when doing local/file pulls */
  if (!remote_name)
    return;
  sd_journal_send ("MESSAGE=libostree HTTP error from remote %s for <%s>: %s",
                   remote_name, url, msg,
                   "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(OSTREE_HTTP_FAILURE_ID),
                   "OSTREE_REMOTE=%s", remote_name,
                   "OSTREE_URL=%s", url,
                   NULL);
#endif
}