src/lib/find_missing.cc

   1 /*
   2     Copyright (C) 2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic 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 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "content.h"
  23 #include "find_missing.h"
  24 #include "util.h"
  25 #include <boost/filesystem.hpp>
  26
  27
  28 using std::map;
  29 using std::shared_ptr;
  30 using std::vector;
  31
  32
  33 typedef map<shared_ptr<Content>, vector<boost::filesystem::path>> Replacements;
  34
  35
  36 static
  37 void
  38 search (Replacements& replacement_paths, boost::filesystem::path directory, int depth = 0)
  39 {
  40         boost::system::error_code ec;
  41         for (auto candidate: boost::filesystem::directory_iterator(directory, ec)) {
  42                 if (boost::filesystem::is_regular_file(candidate.path())) {
  43                         for (auto& replacement: replacement_paths) {
  44                                 for (auto& path: replacement.second) {
  45                                         if (!boost::filesystem::exists(path) && path.filename() == candidate.path().filename()) {
  46                                                 path = candidate.path();
  47                                         }
  48                                 }
  49                         }
  50                 } else if (boost::filesystem::is_directory(candidate.path()) && depth <= 2) {
  51                         search (replacement_paths, candidate, depth + 1);
  52                 }
  53         }
  54
  55         /* Just ignore errors when creating the directory_iterator; they can be triggered by things like
  56          * macOS' love of creating random directories (see #2291).
  57          */
  58 }
  59
  60
  61 void
  62 dcpomatic::find_missing (vector<shared_ptr<Content>> content_to_fix, boost::filesystem::path clue)
  63 {
  64         using namespace boost::filesystem;
  65
  66         Replacements replacement_paths;
  67         for (auto content: content_to_fix) {
  68                 replacement_paths[content] = content->paths();
  69         }
  70
  71         search (replacement_paths, is_directory(clue) ? clue : clue.parent_path());
  72
  73         for (auto content: content_to_fix) {
  74                 auto const& repl = replacement_paths[content];
  75                 bool const replacements_exist = std::find_if(repl.begin(), repl.end(), [](path p) { return !exists(p); }) == repl.end();
  76                 if (replacements_exist && simple_digest(replacement_paths[content]) == content->digest()) {
  77                         content->set_paths (repl);
  78                 }
  79         }
  80 }