gdb/debuginfod-support.c

   1 /* debuginfod utilities for GDB.
   2    Copyright (C) 2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "defs.h"
  20 #include <errno.h>
  21 #include "cli/cli-style.h"
  22 #include "gdbsupport/scoped_fd.h"
  23 #include "debuginfod-support.h"
  24 #include "gdbsupport/gdb_optional.h"
  25
  26 #ifndef HAVE_LIBDEBUGINFOD
  27 scoped_fd
  28 debuginfod_source_query (const unsigned char *build_id,
  29                          int build_id_len,
  30                          const char *srcpath,
  31                          gdb::unique_xmalloc_ptr<char> *destname)
  32 {
  33   return scoped_fd (-ENOSYS);
  34 }
  35
  36 scoped_fd
  37 debuginfod_debuginfo_query (const unsigned char *build_id,
  38                             int build_id_len,
  39                             const char *filename,
  40                             gdb::unique_xmalloc_ptr<char> *destname)
  41 {
  42   return scoped_fd (-ENOSYS);
  43 }
  44 #else
  45 #include <elfutils/debuginfod.h>
  46
  47 struct user_data
  48 {
  49   user_data (const char *desc, const char *fname)
  50     : desc (desc), fname (fname)
  51   { }
  52
  53   const char * const desc;
  54   const char * const fname;
  55   gdb::optional<ui_out::progress_meter> meter;
  56 };
  57
  58 /* Deleter for a debuginfod_client.  */
  59
  60 struct debuginfod_client_deleter
  61 {
  62   void operator() (debuginfod_client *c)
  63   {
  64     debuginfod_end (c);
  65   }
  66 };
  67
  68 using debuginfod_client_up
  69   = std::unique_ptr<debuginfod_client, debuginfod_client_deleter>;
  70
  71 static int
  72 progressfn (debuginfod_client *c, long cur, long total)
  73 {
  74   user_data *data = static_cast<user_data *> (debuginfod_get_user_data (c));
  75
  76   if (check_quit_flag ())
  77     {
  78       printf_filtered ("Cancelling download of %s %ps...\n",
  79                        data->desc,
  80                        styled_string (file_name_style.style (), data->fname));
  81       return 1;
  82     }
  83
  84   if (total == 0)
  85     return 0;
  86
  87   if (!data->meter.has_value ())
  88     {
  89       float size_in_mb = 1.0f * total / (1024 * 1024);
  90       string_file styled_filename (current_uiout->can_emit_style_escape ());
  91       fprintf_styled (&styled_filename,
  92                       file_name_style.style (),
  93                       "%s",
  94                       data->fname);
  95       std::string message
  96         = string_printf ("Downloading %.2f MB %s %s", size_in_mb, data->desc,
  97                          styled_filename.c_str());
  98       data->meter.emplace (current_uiout, message, 1);
  99     }
 100
 101   current_uiout->progress ((double)cur / (double)total);
 102
 103   return 0;
 104 }
 105
 106 static debuginfod_client_up
 107 debuginfod_init ()
 108 {
 109   debuginfod_client_up c (debuginfod_begin ());
 110
 111   if (c != nullptr)
 112     debuginfod_set_progressfn (c.get (), progressfn);
 113
 114   return c;
 115 }
 116
 117 /* See debuginfod-support.h  */
 118
 119 scoped_fd
 120 debuginfod_source_query (const unsigned char *build_id,
 121                          int build_id_len,
 122                          const char *srcpath,
 123                          gdb::unique_xmalloc_ptr<char> *destname)
 124 {
 125   const char *urls_env_var = getenv (DEBUGINFOD_URLS_ENV_VAR);
 126   if (urls_env_var == NULL || urls_env_var[0] == '\0')
 127     return scoped_fd (-ENOSYS);
 128
 129   debuginfod_client_up c = debuginfod_init ();
 130
 131   if (c == nullptr)
 132     return scoped_fd (-ENOMEM);
 133
 134   user_data data ("source file", srcpath);
 135
 136   debuginfod_set_user_data (c.get (), &data);
 137   scoped_fd fd (debuginfod_find_source (c.get (),
 138                                         build_id,
 139                                         build_id_len,
 140                                         srcpath,
 141                                         nullptr));
 142
 143   /* TODO: Add 'set debug debuginfod' command to control when error messages are shown.  */
 144   if (fd.get () < 0 && fd.get () != -ENOENT)
 145     printf_filtered (_("Download failed: %s.  Continuing without source file %ps.\n"),
 146                      safe_strerror (-fd.get ()),
 147                      styled_string (file_name_style.style (),  srcpath));
 148
 149   if (fd.get () >= 0)
 150     *destname = make_unique_xstrdup (srcpath);
 151
 152   return fd;
 153 }
 154
 155 /* See debuginfod-support.h  */
 156
 157 scoped_fd
 158 debuginfod_debuginfo_query (const unsigned char *build_id,
 159                             int build_id_len,
 160                             const char *filename,
 161                             gdb::unique_xmalloc_ptr<char> *destname)
 162 {
 163   const char *urls_env_var = getenv (DEBUGINFOD_URLS_ENV_VAR);
 164   if (urls_env_var == NULL || urls_env_var[0] == '\0')
 165     return scoped_fd (-ENOSYS);
 166
 167   debuginfod_client_up c = debuginfod_init ();
 168
 169   if (c == nullptr)
 170     return scoped_fd (-ENOMEM);
 171
 172   char *dname = nullptr;
 173   user_data data ("separate debug info for", filename);
 174
 175   debuginfod_set_user_data (c.get (), &data);
 176   scoped_fd fd (debuginfod_find_debuginfo (c.get (), build_id, build_id_len,
 177                                            &dname));
 178
 179   if (fd.get () < 0 && fd.get () != -ENOENT)
 180     printf_filtered (_("Download failed: %s.  Continuing without debug info for %ps.\n"),
 181                      safe_strerror (-fd.get ()),
 182                      styled_string (file_name_style.style (),  filename));
 183
 184   if (fd.get () >= 0)
 185     destname->reset (dname);
 186
 187   return fd;
 188 }
 189 #endif