X-Git-Url: http://git.pippins.net/embedvideo/.git/?a=blobdiff_plain;f=main.cc;h=e2864fda9603de454d0eb41d1257dc2b9a55c9e3;hb=831e1711cdf96ccd26203aec08a46e5c09bca3bd;hp=b809f589e5d6381e8e8af3251772f27f1ede5e79;hpb=c1af9697acaf6dbc98afa5ffe18d2c5c7ab12c59;p=backups%2F.git

diff --git a/main.cc b/main.cc
index b809f58..e2864fd 100644
--- a/main.cc
+++ b/main.cc
@@ -1,42 +1,177 @@
 #include <iostream>
+#include <fstream>
 #include <iterator>
-#include <string>
-#include <vector>
 #include <algorithm>
+#include <cassert>
+#include <ctime>
+
+#include "filedata.hpp"
 
 using namespace std;
 
-vector<string> split( const string &line, char c, int limit = -1 ) {
-  string::size_type start = 0, end = 0;
+unsigned long long current_time() {
+  unsigned long long rc = 0;
+  time_t now_tt = time( 0 );
+  tm *now = localtime( &now_tt );
+  rc += ( now->tm_year + 1900ULL ) * 10000000000ULL;
+  rc += ( now->tm_mon  + 1ULL )    * 100000000ULL;
+  rc +=   now->tm_mday             * 1000000ULL;
+  rc +=   now->tm_hour             * 10000ULL;
+  rc +=   now->tm_min              * 100ULL;
+  rc +=   now->tm_sec;
+
+  return rc;
+}
+
+template<class I, class O>
+bool copy_until_full( I begin, I end, O out, unsigned long long &space ) {
+  const unsigned long long block_size = 0x200ULL;
+  bool complete = true;
+
+  I i = begin;
+  while( 0 != space && i != end ) {
+    unsigned long long size = (*i)->getFileSize();
+    unsigned long long blocks = size & ( ~(block_size-1) );
+    if( blocks < size ) blocks += block_size;
 
-  vector<string> out;
-  while( 0 != limit-- && end != line.size() ) {
-    if( 0 == limit ) {
-      end = line.size();
+    if( blocks <= space ) {
+      space -= blocks;
+      out = *i;
+      ++out;
     } else {
-      end = line.find( c, start );
-      if( end == string::npos ) {
-        end = line.size();
-      }
+      // We missed a file that should be included so the backup is not complete
+      complete = false;
     }
-    out.push_back( line.substr( start, end-start ) );
-    start = end + 1;
+    ++i;
   }
-  return out;
+  return complete;
 }
 
-int main() {
-  string file_string;
+template<class SET>
+void populate_set( istream &in, SET &files ) {
   do {
-    file_string.clear();
-    for( int c = cin.get(); 0 != c && ! cin.eof(); c = cin.get() ) {
-      file_string.push_back( c );
+    FileData *data = new FileData();
+    in >> data;
+    if( data->getFileName().size() ) {
+      files.insert( data );
+    } else {
+      delete data;
+    }
+  } while( ! in.eof() );
+}
+
+template<class SET>
+void partition_sets( const SET &current, const SET &old,
+                     SET &added, SET &common, SET &deleted  ) {
+  FileDataNameCmp cmp;
+
+  set_difference( current.begin(), current.end(),
+                  old.begin(),     old.end(),
+                  inserter( added, added.begin() ),
+                  cmp );
+
+  set_difference( old.begin(),     old.end(),
+                  current.begin(), current.end(),
+                  inserter( deleted, deleted.begin() ),
+                  cmp );
+
+  set_union(      current.begin(), current.end(),
+                  old.begin(),     old.end(),
+                  inserter( common, common.begin() ),
+                  cmp );
+}
+
+int main() {
+  // Parse the list of current files on stdin
+  file_set current;
+  populate_set( cin, current );
+
+  file_set backed_up;
+  ifstream db( "test.db" );
+  if( db && db.good() ) {
+    populate_set( db, backed_up );
+  }
+
+  // Now divide the two sets into three sets (added, deleted and common )
+  file_set added, deleted, common;
+  partition_sets( current, backed_up, added, common, deleted );
+
+  { // This little block will copy the last_backup_date from the second set to the first
+    FileDataNameCmp cmp;
+
+    file_set common_with_dates;
+    set_union( backed_up.begin(), backed_up.end(),
+               current.begin(),   current.end(),
+               inserter( common_with_dates, common_with_dates.begin() ),
+               cmp );
+
+    file_set::iterator i = common.begin(), j = common_with_dates.begin();
+    for( ; i != common.end(); ++i, ++j ) {
+      (*i)->setLastBackupDate( (*j)->getLastBackupDate() );
     }
-    if( 0 != file_string.size() ) {
-      // Example entry
-      // type perms user group size datemodified name (7 total)
-      // f 0600 cnb cnb 424 20051015205340 ./.git/index
-      vector<string> values = split( file_string, ' ', 7 );
+  }
+
+  // Now find the list of files to backup.
+  file_set backups;
+
+  // backup all added files
+  copy( added.begin(), added.end(), inserter( backups, backups.begin() ) );
+
+  // backup common files that have changed since the last backup date.
+  for( file_set::iterator i = common.begin(); i != common.end(); ++i ) {
+    if( (*i)->getLastBackupDate() < (*i)->getModifiedDate() ) {
+      backups.insert( *i );
     }
-  } while( ! cin.eof() );
+  }
+
+  // Now, sort the backups by filesize and build a list of up to SIZE
+  file_vector backups_s;
+  copy( backups.begin(), backups.end(), back_inserter( backups_s ) );
+
+  FileDataSizeCmp sizecmp;
+  sort( backups_s.begin(), backups_s.end(), sizecmp );
+
+  file_set final;
+  unsigned long long space = 0x107c00000ULL;  // 4220 MBytes
+
+  insert_iterator<file_set> final_i( final, final.begin() );
+
+  // Copy files over until full or out of files
+  bool complete = copy_until_full( backups_s.rbegin(),
+                                   backups_s.rend(),
+                                   final_i,
+                                   space );
+
+  // Now, sort the non-backed-up list by last_backup_date and back-fill
+  if( 0 != space ) {
+    file_vector leftovers;
+    FileDataNameCmp cmp;
+    set_difference( current.begin(), current.end(),
+                    final.begin(),   final.end(),
+                    back_inserter( leftovers ),
+                    cmp );
+
+    FileDataLastBackupCmp lastbackupcmp;
+    sort( leftovers.begin(), leftovers.end(), lastbackupcmp );
+
+    copy_until_full( leftovers.begin(), leftovers.end(), final_i, space );
+  }
+
+  unsigned long long now = current_time();
+  for( file_set::iterator k = final.begin(); k != final.end(); ++k ) {
+    (*k)->setLastBackupDate( now );
+  }
+
+  // Write the 'current' list to the dbfile
+  ofstream dbout( "test.db" );
+  copy( current.begin(), current.end(), ostream_iterator<FileData*>( dbout, "" ) );
+
+  // Write the 'final' list to stdout
+  copy( final.begin(), final.end(), ostream_iterator<FileData*>( cout, "" ) );
+
+  if( ! complete ) { cerr << "incomplete" << endl; }
+
+  // Clean-up
+  for( file_set::iterator i = backed_up.begin(); i != backed_up.end(); ++i ) { delete *i; }
+  for( file_set::iterator i = current.begin();   i != current.end();   ++i ) { delete *i; }
 }