2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Archival Utilities"
12 ar is an archival utility program used to create, modify, and
13 extract contents from archives. An archive is a single file holding
14 a collection of other files in a structure that makes it possible to
15 retrieve the original individual files (called archive members).
16 The original files' contents, mode (permissions), timestamp, owner,
17 and group are preserved in the archive, and can be restored on
20 The stored filename is limited to 15 characters. (for more information
21 see long filename support).
22 ar has 60 bytes of overheads for every stored file.
24 This implementation of ar can extract archives, it cannot create or
26 On an x86 system, the ar applet adds about 1K.
28 Unless you have a specific application which requires ar, you should
31 config FEATURE_AR_LONG_FILENAMES
32 bool "Support for long filenames (not need for debs)"
36 By default the ar format can only store the first 15 characters of the
37 filename, this option removes that limitation.
38 It supports the GNU ar long filename method which moves multiple long
39 filenames into a the data section of a new ar entry.
45 bunzip2 is a compression utility using the Burrows-Wheeler block
46 sorting text compression algorithm, and Huffman coding. Compression
47 is generally considerably better than that achieved by more
48 conventional LZ77/LZ78-based compressors, and approaches the
49 performance of the PPM family of statistical compressors.
51 Unless you have a specific application which requires bunzip2, you
52 should probably say N here.
58 bzip2 is a compression utility using the Burrows-Wheeler block
59 sorting text compression algorithm, and Huffman coding. Compression
60 is generally considerably better than that achieved by more
61 conventional LZ77/LZ78-based compressors, and approaches the
62 performance of the PPM family of statistical compressors.
64 Unless you have a specific application which requires bzip2, you
65 should probably say N here.
71 cpio is an archival utility program used to create, modify, and extract
72 contents from archives.
73 cpio has 110 bytes of overheads for every stored file.
75 This implementation of cpio can extract cpio archives created in the
76 "newc" or "crc" format, it cannot create or modify them.
78 Unless you have a specific application which requires cpio, you should
82 bool "Support for archive creation"
86 This implementation of cpio can create cpio archives in the "newc"
93 dpkg is a medium-level tool to install, build, remove and manage
96 This implementation of dpkg has a number of limitations,
97 you should use the official dpkg if possible.
103 dpkg-deb packs, unpacks and provides information about Debian archives.
105 This implementation of dpkg-deb cannot pack archives.
107 Unless you have a specific application which requires dpkg-deb,
110 config FEATURE_DPKG_DEB_EXTRACT_ONLY
111 bool "Extract only (-x)"
115 This reduces dpkg-deb to the equivalent of "ar -p <deb> data.tar.gz | tar -zx".
116 However it saves space as none of the extra dpkg-deb, ar or tar options are
117 needed, they are linked to internally.
123 gunzip is used to decompress archives created by gzip.
124 You can use the `-t' option to test the integrity of
125 an archive, without decompressing it.
127 config FEATURE_GUNZIP_UNCOMPRESS
128 bool "Uncompress support"
132 Enable if you want gunzip to have the ability to decompress
133 archives created by the program compress (not much
140 gzip is used to compress files.
141 It's probably the most widely used UNIX compression program.
147 Converts an RPM file into a CPIO archive.
153 Mini RPM applet - queries and extracts RPM packages.
155 config FEATURE_RPM_BZ2
156 bool "Enable handling of rpms with bzip2-compressed data inside"
160 Enable handling of rpms with bzip2-compressed data inside.
166 tar is an archiving program. It's commonly used with gzip to
167 create compressed archives. It's probably the most widely used
168 UNIX archive program.
172 config FEATURE_TAR_CREATE
173 bool "Enable archive creation"
177 If you enable this option you'll be able to create
178 tar archives using the `-c' option.
180 config FEATURE_TAR_GZIP
181 bool "Enable -z option"
185 If you enable this option tar will be able to call gzip,
186 when creating or extracting tar gziped archives.
188 config FEATURE_TAR_BZIP2
189 bool "Enable -j option to handle .tar.bz2 files"
193 If you enable this option you'll be able to extract
194 archives compressed with bzip2.
196 config FEATURE_TAR_LZMA
197 bool "Enable -a option to handle .tar.lzma files"
201 If you enable this option you'll be able to extract
202 archives compressed with lzma.
204 config FEATURE_TAR_COMPRESS
205 bool "Enable -Z option"
209 If you enable this option tar will be able to call uncompress,
210 when extracting .tar.Z archives.
212 config FEATURE_TAR_AUTODETECT
213 bool "Autodetect gz/bz2 compresses tarballs"
215 depends on FEATURE_TAR_GZIP || FEATURE_TAR_BZIP2
217 With this option tar can automatically detect gzip/bzip2 compressed
218 tarballs. Currently it works only on files (not pipes etc).
220 config FEATURE_TAR_FROM
221 bool "Enable -X (exclude from) and -T (include from) options)"
225 If you enable this option you'll be able to specify
226 a list of files to include or exclude from an archive.
228 config FEATURE_TAR_OLDGNU_COMPATIBILITY
229 bool "Support for old tar header format"
233 This option is required to unpack archives created in
234 the old GNU format; help to kill this old format by
235 repacking your ancient archives with the new format.
237 config FEATURE_TAR_OLDSUN_COMPATIBILITY
238 bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
242 This option is required to unpack archives created by some old
243 version of Sun's tar (it was calculating checksum using signed arithmetic).
244 It is said to be fixed in newer Sun tar, but "old" tarballs still exist.
246 config FEATURE_TAR_GNU_EXTENSIONS
247 bool "Support for GNU tar extensions (long filenames)"
251 With this option busybox supports GNU long filenames and
254 config FEATURE_TAR_LONG_OPTIONS
255 bool "Enable long options"
257 depends on TAR && GETOPT_LONG
259 Enable use of long options, increases size by about 400 Bytes
261 config FEATURE_TAR_UNAME_GNAME
262 bool "Enable use of user and group names"
266 Enables use of user and group names in tar. This affects contents
267 listings (-t) and preserving permissions when unpacking (-p).
276 uncompress is used to decompress archives created by compress.
277 Not much used anymore, replaced by gzip/gunzip.
283 unlzma is a compression utility using the Lempel-Ziv-Markov chain
284 compression algorithm, and range coding. Compression
285 is generally considerably better than that achieved by the bzip2
288 The BusyBox unlzma applet is limited to de-compression only.
289 On an x86 system, this applet adds about 4K.
291 Unless you have a specific application which requires unlzma, you
292 should probably say N here.
294 config FEATURE_LZMA_FAST
295 bool "Optimize unlzma for speed"
299 This option reduces decompression time by about 33% at the cost of
306 unzip will list or extract files from a ZIP archive,
307 commonly found on DOS/WIN systems. The default behavior
308 (with no options) is to extract the archive into the
309 current directory. Use the `-d' option to extract to a
310 directory of your choice.
312 comment "Common options for cpio and tar"
313 depends on CPIO || TAR
315 comment "Common options for dpkg and dpkg_deb"
316 depends on DPKG || DPKG_DEB
318 config FEATURE_DEB_TAR_GZ
319 bool "gzip debian packages (normal)"
320 default y if DPKG || DPKG_DEB
321 depends on DPKG || DPKG_DEB
323 This is the default compression method inside the debian ar file.
325 If you want compatibility with standard .deb's you should say yes here.
327 config FEATURE_DEB_TAR_BZ2
328 bool "bzip2 debian packages"
330 depends on DPKG || DPKG_DEB
332 This allows dpkg and dpkg-deb to extract deb's that are compressed internally
333 with bzip2 instead of gzip.
335 You only want this if you are creating your own custom debian packages that
336 use an internal control.tar.bz2 or data.tar.bz2.
338 config FEATURE_DEB_TAR_LZMA
339 bool "lzma debian packages"
341 depends on DPKG || DPKG_DEB
343 This allows dpkg and dpkg-deb to extract deb's that are compressed
344 internally with lzma instead of gzip.
346 You only want this if you are creating your own custom debian
347 packages that use an internal control.tar.lzma or data.tar.lzma.