2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Archival Utilities"
8 config FEATURE_SEAMLESS_LZMA
9 bool "Make tar, rpm, modprobe etc understand .lzma data"
12 Make tar, rpm, modprobe etc understand .lzma data.
14 config FEATURE_SEAMLESS_BZ2
15 bool "Make tar, rpm, modprobe etc understand .bz2 data"
18 Make tar, rpm, modprobe etc understand .bz2 data.
20 config FEATURE_SEAMLESS_GZ
21 bool "Make tar, rpm, modprobe etc understand .gz data"
24 Make tar, rpm, modprobe etc understand .gz data.
26 config FEATURE_SEAMLESS_Z
27 bool "Make tar and gunzip understand .Z data"
30 Make tar and gunzip understand .Z data.
36 ar is an archival utility program used to create, modify, and
37 extract contents from archives. An archive is a single file holding
38 a collection of other files in a structure that makes it possible to
39 retrieve the original individual files (called archive members).
40 The original files' contents, mode (permissions), timestamp, owner,
41 and group are preserved in the archive, and can be restored on
44 The stored filename is limited to 15 characters. (for more information
45 see long filename support).
46 ar has 60 bytes of overheads for every stored file.
48 This implementation of ar can extract archives, it cannot create or
50 On an x86 system, the ar applet adds about 1K.
52 Unless you have a specific application which requires ar, you should
55 config FEATURE_AR_LONG_FILENAMES
56 bool "Support for long filenames (not needed for debs)"
60 By default the ar format can only store the first 15 characters
61 of the filename, this option removes that limitation.
62 It supports the GNU ar long filename method which moves multiple long
63 filenames into a the data section of a new ar entry.
65 config FEATURE_AR_CREATE
66 bool "Support archive creation"
70 This enables archive creation (-c and -r) with busybox ar.
76 bunzip2 is a compression utility using the Burrows-Wheeler block
77 sorting text compression algorithm, and Huffman coding. Compression
78 is generally considerably better than that achieved by more
79 conventional LZ77/LZ78-based compressors, and approaches the
80 performance of the PPM family of statistical compressors.
82 Unless you have a specific application which requires bunzip2, you
83 should probably say N here.
89 bzip2 is a compression utility using the Burrows-Wheeler block
90 sorting text compression algorithm, and Huffman coding. Compression
91 is generally considerably better than that achieved by more
92 conventional LZ77/LZ78-based compressors, and approaches the
93 performance of the PPM family of statistical compressors.
95 Unless you have a specific application which requires bzip2, you
96 should probably say N here.
102 cpio is an archival utility program used to create, modify, and
103 extract contents from archives.
104 cpio has 110 bytes of overheads for every stored file.
106 This implementation of cpio can extract cpio archives created in the
107 "newc" or "crc" format, it cannot create or modify them.
109 Unless you have a specific application which requires cpio, you
110 should probably say N here.
112 config FEATURE_CPIO_O
113 bool "Support for archive creation"
117 This implementation of cpio can create cpio archives in the "newc"
120 config FEATURE_CPIO_P
121 bool "Support for passthrough mode"
123 depends on FEATURE_CPIO_O
125 Passthrough mode. Rarely used.
130 select FEATURE_SEAMLESS_GZ
132 dpkg is a medium-level tool to install, build, remove and manage
135 This implementation of dpkg has a number of limitations,
136 you should use the official dpkg if possible.
141 select FEATURE_SEAMLESS_GZ
143 dpkg-deb unpacks and provides information about Debian archives.
145 This implementation of dpkg-deb cannot pack archives.
147 Unless you have a specific application which requires dpkg-deb,
150 config FEATURE_DPKG_DEB_EXTRACT_ONLY
151 bool "Extract only (-x)"
155 This reduces dpkg-deb to the equivalent of
156 "ar -p <deb> data.tar.gz | tar -zx". However it saves space as none
157 of the extra dpkg-deb, ar or tar options are needed, they are linked
164 gunzip is used to decompress archives created by gzip.
165 You can use the `-t' option to test the integrity of
166 an archive, without decompressing it.
172 gzip is used to compress files.
173 It's probably the most widely used UNIX compression program.
175 config FEATURE_GZIP_LONG_OPTIONS
176 bool "Enable long options"
178 depends on GZIP && LONG_OPTS
180 Enable use of long options, increases size by about 106 Bytes
186 Lzop compression/decompresion.
188 config LZOP_COMPR_HIGH
189 bool "lzop complession levels 7,8,9 (not very useful)"
193 High levels (7,8,9) of lzop compression. These levels
194 are actually slower than gzip at equivalent compression ratios
195 and take up 3.2K of code.
201 Converts an RPM file into a CPIO archive.
207 Mini RPM applet - queries and extracts RPM packages.
213 tar is an archiving program. It's commonly used with gzip to
214 create compressed archives. It's probably the most widely used
215 UNIX archive program.
217 config FEATURE_TAR_CREATE
218 bool "Enable archive creation"
222 If you enable this option you'll be able to create
223 tar archives using the `-c' option.
225 config FEATURE_TAR_AUTODETECT
226 bool "Autodetect compressed tarballs"
228 depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA)
230 With this option tar can automatically detect compressed
231 tarballs. Currently it works only on files (not pipes etc).
233 config FEATURE_TAR_FROM
234 bool "Enable -X (exclude from) and -T (include from) options)"
238 If you enable this option you'll be able to specify
239 a list of files to include or exclude from an archive.
241 config FEATURE_TAR_OLDGNU_COMPATIBILITY
242 bool "Support for old tar header format"
244 depends on TAR || DPKG
246 This option is required to unpack archives created in
247 the old GNU format; help to kill this old format by
248 repacking your ancient archives with the new format.
250 config FEATURE_TAR_OLDSUN_COMPATIBILITY
251 bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
253 depends on TAR || DPKG
255 This option is required to unpack archives created by some old
256 version of Sun's tar (it was calculating checksum using signed
257 arithmetic). It is said to be fixed in newer Sun tar, but "old"
258 tarballs still exist.
260 config FEATURE_TAR_GNU_EXTENSIONS
261 bool "Support for GNU tar extensions (long filenames)"
263 depends on TAR || DPKG
265 With this option busybox supports GNU long filenames and
268 config FEATURE_TAR_LONG_OPTIONS
269 bool "Enable long options"
271 depends on TAR && LONG_OPTS
273 Enable use of long options, increases size by about 400 Bytes
275 config FEATURE_TAR_UNAME_GNAME
276 bool "Enable use of user and group names"
280 Enables use of user and group names in tar. This affects contents
281 listings (-t) and preserving permissions when unpacking (-p).
284 config FEATURE_TAR_NOPRESERVE_TIME
285 bool "Enable -m (do not preserve time) option"
289 With this option busybox supports GNU tar -m
290 (do not preserve time) option.
292 config FEATURE_TAR_SELINUX
293 bool "Support for extracting SELinux labels"
295 depends on TAR && SELINUX
297 With this option busybox supports restoring SELinux labels
298 when extracting files from tar archives.
304 uncompress is used to decompress archives created by compress.
305 Not much used anymore, replaced by gzip/gunzip.
311 unlzma is a compression utility using the Lempel-Ziv-Markov chain
312 compression algorithm, and range coding. Compression
313 is generally considerably better than that achieved by the bzip2
316 The BusyBox unlzma applet is limited to de-compression only.
317 On an x86 system, this applet adds about 4K.
319 Unless you have a specific application which requires unlzma, you
320 should probably say N here.
322 config FEATURE_LZMA_FAST
323 bool "Optimize unlzma for speed"
327 This option reduces decompression time by about 25% at the cost of
334 unzip will list or extract files from a ZIP archive,
335 commonly found on DOS/WIN systems. The default behavior
336 (with no options) is to extract the archive into the
337 current directory. Use the `-d' option to extract to a
338 directory of your choice.