# # For a description of the syntax of this configuration file, # see scripts/kbuild/config-language.txt. # menu "Archival Utilities" config AR bool "ar" default n help ar is an archival utility program used to create, modify, and extract contents from archives. An archive is a single file holding a collection of other files in a structure that makes it possible to retrieve the original individual files (called archive members). The original files' contents, mode (permissions), timestamp, owner, and group are preserved in the archive, and can be restored on extraction. The stored filename is limited to 15 characters. (for more information see long filename support). ar has 60 bytes of overheads for every stored file. This implementation of ar can extract archives, it cannot create or modify them. On an x86 system, the ar applet adds about 1K. Unless you have a specific application which requires ar, you should probably say N here. config FEATURE_AR_LONG_FILENAMES bool "Enable support for long filenames (not need for debs)" default n depends on AR help By default the ar format can only store the first 15 characters of the filename, this option removes that limitation. It supports the GNU ar long filename method which moves multiple long filenames into a the data section of a new ar entry. config BUNZIP2 bool "bunzip2" default n help bunzip2 is a compression utility using the Burrows-Wheeler block sorting text compression algorithm, and Huffman coding. Compression is generally considerably better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors. The BusyBox bunzip2 applet is limited to de-compression only. On an x86 system, this applet adds about 11K. Unless you have a specific application which requires bunzip2, you should probably say N here. config CPIO bool "cpio" default n help cpio is an archival utility program used to create, modify, and extract contents from archives. cpio has 110 bytes of overheads for every stored file. This implementation of cpio can extract cpio archives created in the "newc" or "crc" format, it cannot create or modify them. Unless you have a specific application which requires cpio, you should probably say N here. config DPKG bool "dpkg" default n help dpkg is a medium-level tool to install, build, remove and manage Debian packages. This implementation of dpkg has a number of limitations, you should use the official dpkg if possible. config DPKG_DEB bool "dpkg_deb" default n help dpkg-deb packs, unpacks and provides information about Debian archives. This implementation of dpkg-deb cannot pack archives. Unless you have a specific application which requires dpkg-deb, you should probably say N here. config FEATURE_DPKG_DEB_EXTRACT_ONLY bool "extract only (-x)" default n depends on DPKG_DEB help This reduces dpkg-deb to the equivalent of "ar -p <deb> data.tar.gz | tar -zx". However it saves space as none of the extra dpkg-deb, ar or tar options are needed, they are linked to internally. config GUNZIP bool "gunzip" default n help gunzip is used to decompress archives created by gzip. You can use the `-t' option to test the integrity of an archive, without decompressing it. config FEATURE_GUNZIP_UNCOMPRESS bool "Uncompress support" default n depends on GUNZIP help Enable if you want gunzip to have the ability to decompress archives created by the program compress (not much used anymore). config GZIP bool "gzip" default n help gzip is used to compress files. It's probably the most widely used UNIX compression program. config RPM2CPIO bool "rpm2cpio" default n help Converts an RPM file into a CPIO archive. config RPM bool "rpm" default n help Mini RPM applet - queries and extracts config TAR bool "tar" default n help tar is an archiving program. It's commonly used with gzip to create compressed archives. It's probably the most widely used UNIX archive program. config FEATURE_TAR_CREATE bool "Enable archive creation" default y depends on TAR help If you enable this option you'll be able to create tar archives using the `-c' option. config FEATURE_TAR_BZIP2 bool "Enable -j option to handle .tar.bz2 files" default n depends on TAR help If you enable this option you'll be able to extract archives compressed with bzip2. config FEATURE_TAR_LZMA bool "Enable -a option to handle .tar.lzma files" default n depends on TAR help If you enable this option you'll be able to extract archives compressed with lzma. config FEATURE_TAR_FROM bool "Enable -X (exclude from) and -T (include from) options)" default n depends on TAR help If you enable this option you'll be able to specify a list of files to include or exclude from an archive. config FEATURE_TAR_GZIP bool "Enable -z option" default y depends on TAR help If you enable this option tar will be able to call gzip, when creating or extracting tar gziped archives. config FEATURE_TAR_COMPRESS bool "Enable -Z option" default n depends on TAR help If you enable this option tar will be able to call uncompress, when extracting .tar.Z archives. config FEATURE_TAR_OLDGNU_COMPATIBILITY bool "Enable support for old tar header format" default N depends on TAR help This option is required to unpack archives created in the old GNU format; help to kill this old format by repacking your ancient archives with the new format. config FEATURE_TAR_GNU_EXTENSIONS bool "Enable support for some GNU tar extensions" default y depends on TAR help With this option busybox supports GNU long filenames and linknames. config FEATURE_TAR_LONG_OPTIONS bool "Enable long options" default n depends on TAR && GETOPT_LONG help Enable use of long options, increases size by about 400 Bytes config UNCOMPRESS bool "uncompress" default n help uncompress is used to decompress archives created by compress. Not much used anymore, replaced by gzip/gunzip. config UNLZMA bool "unlzma" default n help unlzma is a compression utility using the Lempel-Ziv-Markov chain compression algorithm, and range coding. Compression is generally considerably better than that achieved by the bzip2 compressors. The BusyBox unlzma applet is limited to de-compression only. On an x86 system, this applet adds about 4K. Unless you have a specific application which requires unlzma, you should probably say N here. config FEATURE_LZMA_FAST bool "Optimze unlzma for speed" default n depends on UNLZMA help This option reduces decompression time by about 33% at the cost of a 2K bigger binary. config UNZIP bool "unzip" default n help unzip will list or extract files from a ZIP archive, commonly found on DOS/WIN systems. The default behavior (with no options) is to extract the archive into the current directory. Use the `-d' option to extract to a directory of your choice. comment "Common options for cpio and tar" depends on CPIO || TAR config FEATURE_UNARCHIVE_TAPE bool "Enable tape drive support" default n depends on CPIO || TAR help I don't think this is needed anymore. comment "Common options for dpkg and dpkg_deb" depends on DPKG || DPKG_DEB config FEATURE_DEB_TAR_GZ bool "gzip debian packages (normal)" default y if DPKG || DPKG_DEB depends on DPKG || DPKG_DEB help This is the default compression method inside the debian ar file. If you want compatibility with standard .deb's you should say yes here. config FEATURE_DEB_TAR_BZ2 bool "bzip2 debian packages" default n depends on DPKG || DPKG_DEB help This allows dpkg and dpkg-deb to extract deb's that are compressed internally with bzip2 instead of gzip. You only want this if you are creating your own custom debian packages that use an internal control.tar.bz2 or data.tar.bz2. config FEATURE_DEB_TAR_LZMA bool "lzma debian packages" default n depends on DPKG || DPKG_DEB help This allows dpkg and dpkg-deb to extract deb's that are compressed internally with lzma instead of gzip. You only want this if you are creating your own custom debian packages that use an internal control.tar.lzma or data.tar.lzma. endmenu