#include <algorithm>
#include <cassert>
#include <ctime>
+#include <math.h>
#include "filedata.hpp"
using namespace std;
-static const unsigned int bytes_in_block = 0x800;
-static const char * dbname = "/var/lib/backups/backups.db";
+static unsigned int bytes_in_block;
+static const char * dbname_in = getenv("backupdbin");
+static const char * dbname_out = getenv("backupdbout");
unsigned long long read_time( istream &i ) {
string date_string;
bool copy_until_full( I begin, I end, O out, INT &space ) {
bool complete = true;
- I i = begin;
- while( 0 != space && i != end ) {
- INT size = (*i)->getFileSize();
+ while( begin != end ) {
+ INT size = (*begin)->getFileSize();
INT blocksize = blocks( size ) * bytes_in_block;
if( blocksize <= space ) {
space -= blocksize;
- out = *i;
+ *out = *begin;
++out;
} else {
// We missed a file that should be included so the backup is not complete
complete = false;
}
- ++i;
+ ++begin;
}
return complete;
}
template<class SET>
void partition_sets( const SET ¤t, const SET &old,
SET &added, SET &common, SET &old_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 );
-
- set_union( old.begin(), old.end(),
- common.begin(), common.end(),
- inserter( old_common, old_common.begin() ),
- cmp );
+ set_difference( current.begin(), current.end(),
+ old.begin(), old.end(),
+ inserter( added, added.begin() ),
+ FileData::namecmp );
+
+ set_difference( old.begin(), old.end(),
+ current.begin(), current.end(),
+ inserter( deleted, deleted.begin() ),
+ FileData::namecmp );
+
+ set_intersection( current.begin(), current.end(),
+ old.begin(), old.end(),
+ inserter( common, common.begin() ),
+ FileData::namecmp );
+
+ set_intersection( old.begin(), old.end(),
+ common.begin(), common.end(),
+ inserter( old_common, old_common.begin() ),
+ FileData::namecmp );
}
template<class INT>
numbytes += filesize;
numblocks += blocks( filesize );
- begin++;
+ ++begin;
}
}
}
int main() {
+
+ // Check to make sure required env variables are set
+ if( getenv( "backupdbin" ) == NULL ||
+ getenv( "backupdbout" ) == NULL ||
+ getenv( "blocksize" ) == NULL ||
+ getenv( "availsizemb" ) == NULL )
+ {
+ cerr << "Required environment variables are not set. Exiting." << endl;
+ return 1;
+ }
+
+ // Setup our bytes_in_block value
+ bytes_in_block = atoll(getenv("blocksize"));
+
// Get the date on stdin
unsigned long long now = read_time( cin );
populate_set( cin, current );
file_set backed_up;
- ifstream db( dbname );
+ ifstream db( dbname_in );
if( db && db.good() ) {
populate_set( db, backed_up );
}
// Now find the list of files to backup.
file_set backups;
- insert_iterator<file_set> backups_i( backups, backups.begin() );
// backup all added files
- copy( added.begin(), added.end(), backups_i );
+ copy( added.begin(), added.end(), inserter( backups, backups.begin() ) );
// Track the total size of added files
unsigned long long added_blocks, added_bytes;
sizes( added.begin(), added.end(), added_blocks, added_bytes );
- file_vector modified_files;
+ file_vector modified_v;
// Backup files that have been modified
file_set::iterator i = common.begin(), j = old_common.begin();
for( ; i != common.end(); ++i, ++j ) {
(*i)->setLastBackupDate( (*j)->getLastBackupDate() );
- if( needs_backup( *j, *i ) ) modified_files.push_back( *i );
+ if( needs_backup( *j, *i ) ) modified_v.push_back( *i );
}
- copy( modified_files.begin(), modified_files.end(), backups_i );
+ copy( modified_v.begin(), modified_v.end(), inserter( backups, backups.begin() ) );
// Track the total size of modified files
unsigned long long modified_blocks, modified_bytes;
- sizes( modified_files.begin(), modified_files.end(), modified_blocks, modified_bytes );
+ sizes( modified_v.begin(), modified_v.end(), modified_blocks, modified_bytes );
- // Now, sort the backups by filesize and build a list that'll fit on a DVD
+ // Now, sort the backups by filesize (decreasing) and build a list that'll fit
+ // on a DVD
file_vector backups_s;
copy( backups.begin(), backups.end(), back_inserter( backups_s ) );
- FileDataSizeCmp sizecmp;
- sort( backups_s.begin(), backups_s.end(), sizecmp );
+ sort( backups_s.rbegin(), backups_s.rend(), FileData::sizecmp );
file_set final;
- unsigned long long space = 0x100000000ULL; // After looking at how big the ISO can be and how many 1K blocks are left after formatting the filesystem I decided on an even 4GB target
+ const unsigned long long availsizemb = atoll( getenv("availsizemb") ) * 0x100000ull;
+ unsigned long long space = availsizemb;
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 );
+ = copy_until_full( backups_s.begin(), backups_s.end(), final_i, space );
// Track the size filled up by essential backups
unsigned long long essential_blocks, essential_bytes;
sizes( final.begin(), final.end(), essential_blocks, essential_bytes );
- // Now, sort the non-backed-up list by last_backup_date and back-fill
+ // Now, sort the non-backed-up list by last_backup_date, then by filesize
+ // (decreasing) and back-fill. This should minimize the number of DVDs in the
+ // collection left with actual content.
if( 0 != space ) {
file_vector leftovers;
- FileDataNameCmp cmp;
set_difference( current.begin(), current.end(),
final.begin(), final.end(),
back_inserter( leftovers ),
- cmp );
+ FileData::namecmp );
- FileDataLastBackupCmp lastbackupcmp;
- sort( leftovers.begin(), leftovers.end(), lastbackupcmp );
+ // Achieve 'last backup date then by filesize' by first sorting by filesize
+ // and then running stable sort by last backup date.
+ sort( leftovers.rbegin(), leftovers.rend(), FileData::sizecmp );
+ stable_sort( leftovers.begin(), leftovers.end(), FileData::lastbackupcmp );
copy_until_full( leftovers.begin(), leftovers.end(), final_i, space );
}
unsigned long long total_blocks, total_bytes;
sizes( final.begin(), final.end(), total_blocks, total_bytes );
+ // Track how many disks there are remaining to be burned
+ unsigned long long disks_remaining = 0;
+ if(modified_bytes || added_bytes)
+ disks_remaining = static_cast<unsigned long long>(
+ ceil( static_cast<double>( modified_bytes + added_bytes ) / availsizemb ) - 1
+ );
+
updateLastBackupDate( final.begin(), final.end(), now );
// Write the 'current' list to the dbfile
- ofstream dbout( dbname );
+ ofstream dbout( dbname_out );
copy( current.begin(), current.end(), ostream_iterator<FileData*>( dbout ) );
// Write the 'final' list to stdout
cerr << now << endl << endl;
cerr << "Need backing up..." << endl;
- cerr << " Added Bytes: " << added_bytes << endl;
- cerr << " Added Blocks: " << added_blocks << endl;
- cerr << " Modified Bytes: " << modified_bytes << endl;
- cerr << " Modified Blocks: " << modified_blocks << endl << endl;
+ cerr << " Added Bytes: " << added_bytes << endl;
+ cerr << " Added Blocks: " << added_blocks << endl;
+ cerr << " Modified Bytes: " << modified_bytes << endl;
+ cerr << " Modified Blocks: " << modified_blocks << endl;
+ cerr << " Disks Remaining: " << disks_remaining << endl << endl;
cerr << "Will be backed up..." << endl;
- cerr << " Essential Bytes: " << essential_bytes << endl;
- cerr << " Essential Blocks: " << essential_blocks << endl;
- cerr << " Total Bytes: " << total_bytes << endl;
- cerr << " Total Blocks: " << total_blocks << endl << endl;
+ cerr << " Essential Bytes: " << essential_bytes << endl;
+ cerr << " Essential Blocks: " << essential_blocks << endl;
+ cerr << " Total Bytes: " << total_bytes << endl;
+ cerr << " Total Blocks: " << total_blocks << endl << endl;
if( ! complete ) { cerr << "Backup is incomplete!" << endl; }
projects / backups / .git / blobdiff