diff options
Diffstat (limited to 'lib/libalpm/be_sync.c')
| -rw-r--r-- | lib/libalpm/be_sync.c | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c index f7101f54..0c968b45 100644 --- a/lib/libalpm/be_sync.c +++ b/lib/libalpm/be_sync.c @@ -145,9 +145,67 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db) static int sync_db_read(pmdb_t *db, struct archive *archive, struct archive_entry *entry, pmpkg_t *likely_pkg); +/* + * This is the data table used to generate the estimating function below. + * "Weighted Avg" means averaging the bottom table values; thus each repo, big + * or small, will have equal influence. "Unweighted Avg" means averaging the + * sums of the top table columns, thus each package has equal influence. The + * final values are calculated by (surprise) averaging the averages, because + * why the hell not. + * + * Database Pkgs tar bz2 gz xz + * community 2096 5294080 256391 421227 301296 + * core 180 460800 25257 36850 29356 + * extra 2606 6635520 294647 470818 339392 + * multilib 126 327680 16120 23261 18732 + * testing 76 204800 10902 14348 12100 + * + * Bytes Per Package + * community 2096 2525.80 122.32 200.97 143.75 + * core 180 2560.00 140.32 204.72 163.09 + * extra 2606 2546.25 113.06 180.67 130.23 + * multilib 126 2600.63 127.94 184.61 148.67 + * testing 76 2694.74 143.45 188.79 159.21 + + * Weighted Avg 2585.48 129.42 191.95 148.99 + * Unweighted Avg 2543.39 118.74 190.16 137.93 + * Average of Avgs 2564.44 124.08 191.06 143.46 + */ +static int estimate_package_count(struct stat *st, struct archive *archive) +{ + unsigned int per_package; + + switch(archive_compression(archive)) { + case ARCHIVE_COMPRESSION_NONE: + per_package = 2564; + break; + case ARCHIVE_COMPRESSION_GZIP: + per_package = 191; + break; + case ARCHIVE_COMPRESSION_BZIP2: + per_package = 124; + break; + case ARCHIVE_COMPRESSION_COMPRESS: + per_package = 193; + break; + case ARCHIVE_COMPRESSION_LZMA: + case ARCHIVE_COMPRESSION_XZ: + per_package = 143; + break; + case ARCHIVE_COMPRESSION_UU: + per_package = 3543; + break; + default: + /* assume it is at least somewhat compressed */ + per_package = 200; + } + return((int)(st->st_size / per_package) + 1); +} + static int sync_db_populate(pmdb_t *db) { - int count = 0; + int est_count, count = 0; + struct stat buf; struct archive *archive; struct archive_entry *entry; pmpkg_t *pkg = NULL; @@ -169,6 +227,10 @@ static int sync_db_populate(pmdb_t *db) archive_read_finish(archive); RET_ERR(PM_ERR_DB_OPEN, 1); } + if(lstat(_alpm_db_path(db), &buf) != 0) { + RET_ERR(PM_ERR_DB_OPEN, 1); + } + est_count = estimate_package_count(&buf, archive); while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) { const struct stat *st; |