rpm-payloadflags - Man Page
RPM payload flags
Synopsis
w[FLAGS].TYPE
Description
The payload flags determine how the payload of an RPM package is compressed when the package is built. The flags are stored in the Payloadcompressor and Payloadflags tags of the package header, which are used to determine how to uncompress the payload contents during installation.
The peculiar syntax is directly inherited from librpm's Fopen() IO API, where w means opening a file for writing.
The following compression types are supported, but availability may vary depending on how RPM was compiled.
| TYPE | Description | |||
| ufdio | uncompressed | |||
| gzdio | gzip (aka zlib) | |||
| bzdio | bzip2 | |||
| xzdio | xz | |||
| lzdio | legacy lzma | |||
| zstdio | zstd |
The compression FLAGS must be listed in the following order and can be any of:
| FLAGS | Description | Types | |||
| <0-9> | compression level | all (ufdio ignores) | |||
| T[0-N] | number of threads (no number or 0 = autodetect) | xzdio, zstdio | |||
| L<0-9> | window size(see --long in zstd(1)) | zstdio |
If a flag is omitted, the compressor's default value will be used.
A higher compression level generally means better compression ratio at the cost of increased resource use and compression times.
T is equivalent to T0 and causes the number of threads to be automatically detected. Note that while using threads can speed up compression considerably, it typically causes the compression ratio to go down, and make the output less predictable.
Examples
| Mode | Description | |||
| w9.gzdio | gzip level 9, default for package payload | |||
| w9.bzdio | bzip2 level 9, bzip2's default | |||
| w.xzdio | xz default level | |||
| w7T16.xzdio | xz level 7 using 16 threads | |||
| w7T0.xzdio | xz level 7, autodetect no. of threads | |||
| w6.lzdio | lzma (legacy) level 6, lzma's default | |||
| w19T8.zstdio | zstd level 19 using 8 threads | |||
| w7T.zstdio | zstd level 7, autodetect no. of threads | |||
| w.ufdio | uncompressed |
See Also
rpmbuild-config(5), rpm-config(5)
http://www.rpm.org/