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Code Issues Releases Activity

Skip backup of unchanged files

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This commit is contained in:
Sergey Cherkashin 2018-10-10 19:13:17 +03:00
parent b0021bfbc4
commit b36a6c1201
1 changed files with 22 additions and 14 deletions
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36
src/backup.c
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@ -2091,12 +2091,13 @@ backup_files(void *arg)
if (S_ISREG(buf.st_mode))
{
pgFile **prev_file;
/* Check that file exist in previous backup */
if (current.backup_mode != BACKUP_MODE_FULL)
{
char *relative;
pgFile key;
pgFile **prev_file;
relative = GetRelativePath(file->path, arguments->from_root);
key.path = relative;
@ -2126,20 +2127,27 @@ backup_files(void *arg)
continue;
}
}
/* TODO:
* Check if file exists in previous backup
* If exists:
* if mtime > start_backup_time of parent backup,
* copy file to backup
* if mtime < start_backup_time
* calculate crc, compare crc to old file
* if crc is the same -> skip file
*/
else if (!copy_file(arguments->from_root, arguments->to_root, file))
else
{
file->write_size = BYTES_INVALID;
elog(VERBOSE, "File \"%s\" was not copied to backup", file->path);
continue;
bool skip = false;
/* If non-data file has not changed since last backup... */
if (file->exists_in_prev &&
buf.st_mtime < current.parent_backup)
{
calc_file_checksum(file);
/* ...and checksum is the same... */
if (EQ_CRC32C(file->crc, (*prev_file)->crc))
skip = true; /* ...skip copying file. */
}
if (skip ||
!copy_file(arguments->from_root, arguments->to_root, file))
{
file->write_size = BYTES_INVALID;
elog(VERBOSE, "File \"%s\" was not copied to backup",
file->path);
continue;
}
}
elog(VERBOSE, "File \"%s\". Copied "INT64_FORMAT " bytes",