UNPACKER.ECLASS

Section: eclass-manpages (5)
Updated: Oct 2024
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NAME

unpacker.eclass - helpers for extraneous file formats and consistent behavior across EAPIs

DESCRIPTION

Some extraneous file formats are not part of PMS, or are only in certain EAPIs. Rather than worrying about that, support the crazy cruft here and for all EAPI versions.

SUPPORTED EAPIS

7 8

FUNCTIONS

unpack_pdv <file to unpack> <size of off_t>

Unpack those pesky pdv generated files ... They're self-unpacking programs with the binary package stuffed in the middle of the archive. Valve seems to use it a lot ... too bad it seems to like to segfault a lot :(. So lets take it apart ourselves.

You have to specify the off_t size ... I have no idea how to extract that information out of the binary executable myself. Basically you pass in the size of the off_t type (in bytes) on the machine that built the pdv archive.

One way to determine this is by running the following commands:

        strings <pdv archive> | grep lseek
        strace -elseek <pdv archive>

Basically look for the first lseek command (we do the strings/grep because sometimes the function call is _llseek or something) and steal the 2nd parameter. Here is an example:

        $ strings hldsupdatetool.bin | grep lseek
        lseek
        $ strace -elseek ./hldsupdatetool.bin
        lseek(3, -4, SEEK_END)                                  = 2981250

Thus we would pass in the value of '4' as the second parameter.

unpack_makeself [file to unpack] [offset] [tail|dd]

Unpack those pesky makeself generated files ... They're shell scripts with the binary package tagged onto the end of the archive. Loki utilized the format as does many other game companies.

If the file is not specified, then ${A} is used. If the offset is not specified then we will attempt to extract the proper offset from the script itself.

unpack_deb <one deb to unpack>

Unpack a Debian .deb archive in style.

unpack_cpio <one cpio to unpack>

Unpack a cpio archive, file "-" means stdin.

unpack_zip <zip file>

Unpack zip archives. This function ignores all non-fatal errors (i.e. warnings). That is useful for zip archives with extra crap attached (e.g. self-extracting archives).

unpack_7z <7z file>

Unpack 7z archives.

unpack_rar <rar file>

Unpack RAR archives.

unpack_lha <lha file>

Unpack LHA/LZH archives.

unpack_gpkg <gpkg file>

Unpack the image subarchive of a GPKG package on-the-fly, preserving the original directory structure (i.e. into <gpkg-dir>/image).

unpacker [archives to unpack]

This works in the same way that `unpack` does. If you don't specify any files, it will default to ${A}.

unpacker_src_unpack

Run `unpacker` to unpack all our stuff.

unpacker_src_uri_depends [archives that we will unpack]

Walk all the specified files (defaults to $SRC_URI) and figure out the dependencies that are needed to unpack things.

Note: USE flags are not yet handled.

Return value: Dependencies needed to unpack all the archives

ECLASS VARIABLES

UNPACKER_BZ2 (USER VARIABLE): Utility to use to decompress bzip2 files. Will dynamically pick between `lbzip2`, `pbzip2`, and `bzip2`. Make sure your choice accepts the "-dc" options. Note: this is meant for users to set, not ebuilds.
UNPACKER_LZIP (USER VARIABLE): Utility to use to decompress lzip files. Will dynamically pick between `xz`, `plzip`, `pdlzip`, and `lzip`. Make sure your choice accepts the "-dc" options. Note: this is meant for users to set, not ebuilds.

MAINTAINERS

base-system@gentoo.org

REPORTING BUGS

Please report bugs via https://bugs.gentoo.org/

FILES

unpacker.eclass

This document was created by man2html, using the manual pages.
Time: 03:27:01 GMT, October 07, 2024