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 "Enable 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
85 dpkg is a medium-level tool to install, build, remove and manage Debian packages.
87 This implementation of dpkg has a number of limitations, you should use the
88 official dpkg if possible.
94 dpkg-deb packs, unpacks and provides information about Debian archives.
96 This implementation of dpkg-deb cannot pack archives.
98 Unless you have a specific application which requires dpkg-deb, you should
101 config FEATURE_DPKG_DEB_EXTRACT_ONLY
102 bool "extract only (-x)"
106 This reduces dpkg-deb to the equivalent of "ar -p <deb> data.tar.gz | tar -zx".
107 However it saves space as none of the extra dpkg-deb, ar or tar options are
108 needed, they are linked to internally.
114 gunzip is used to decompress archives created by gzip.
115 You can use the `-t' option to test the integrity of
116 an archive, without decompressing it.
118 config FEATURE_GUNZIP_UNCOMPRESS
119 bool "Uncompress support"
123 Enable if you want gunzip to have the ability to decompress
124 archives created by the program compress (not much
131 gzip is used to compress files.
132 It's probably the most widely used UNIX compression program.
138 Converts an RPM file into a CPIO archive.
144 Mini RPM applet - queries and extracts RPM packages.
146 config FEATURE_RPM_BZ2
147 bool "Enable handling of rpms with bzip2-compressed data inside"
151 Enable handling of rpms with bzip2-compressed data inside.
157 tar is an archiving program. It's commonly used with gzip to
158 create compressed archives. It's probably the most widely used
159 UNIX archive program.
161 config FEATURE_TAR_CREATE
162 bool "Enable archive creation"
166 If you enable this option you'll be able to create
167 tar archives using the `-c' option.
169 config FEATURE_TAR_BZIP2
170 bool "Enable -j option to handle .tar.bz2 files"
174 If you enable this option you'll be able to extract
175 archives compressed with bzip2.
177 config FEATURE_TAR_LZMA
178 bool "Enable -a option to handle .tar.lzma files"
182 If you enable this option you'll be able to extract
183 archives compressed with lzma.
185 config FEATURE_TAR_FROM
186 bool "Enable -X (exclude from) and -T (include from) options)"
190 If you enable this option you'll be able to specify
191 a list of files to include or exclude from an archive.
193 config FEATURE_TAR_GZIP
194 bool "Enable -z option"
198 If you enable this option tar will be able to call gzip,
199 when creating or extracting tar gziped archives.
201 config FEATURE_TAR_COMPRESS
202 bool "Enable -Z option"
206 If you enable this option tar will be able to call uncompress,
207 when extracting .tar.Z archives.
209 config FEATURE_TAR_OLDGNU_COMPATIBILITY
210 bool "Enable support for old tar header format"
214 This option is required to unpack archives created in
215 the old GNU format; help to kill this old format by
216 repacking your ancient archives with the new format.
218 config FEATURE_TAR_OLDSUN_COMPATIBILITY
219 bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
223 This option is required to unpack archives created by some old
224 version of Sun's tar (it was calculating checksum using signed arithmetic).
225 It is said to be fixed in newer Sun tar, but "old" tarballs still exist.
227 config FEATURE_TAR_GNU_EXTENSIONS
228 bool "Enable support for some GNU tar extensions"
232 With this option busybox supports GNU long filenames and
235 config FEATURE_TAR_LONG_OPTIONS
236 bool "Enable long options"
238 depends on TAR && GETOPT_LONG
240 Enable use of long options, increases size by about 400 Bytes
246 uncompress is used to decompress archives created by compress.
247 Not much used anymore, replaced by gzip/gunzip.
253 unlzma is a compression utility using the Lempel-Ziv-Markov chain
254 compression algorithm, and range coding. Compression
255 is generally considerably better than that achieved by the bzip2
258 The BusyBox unlzma applet is limited to de-compression only.
259 On an x86 system, this applet adds about 4K.
261 Unless you have a specific application which requires unlzma, you
262 should probably say N here.
264 config FEATURE_LZMA_FAST
265 bool "Optimze unlzma for speed"
269 This option reduces decompression time by about 33% at the cost of
276 unzip will list or extract files from a ZIP archive,
277 commonly found on DOS/WIN systems. The default behavior
278 (with no options) is to extract the archive into the
279 current directory. Use the `-d' option to extract to a
280 directory of your choice.
282 comment "Common options for cpio and tar"
283 depends on CPIO || TAR
285 config FEATURE_UNARCHIVE_TAPE
286 bool "Enable tape drive support"
288 depends on CPIO || TAR
290 I don't think this is needed anymore.
292 comment "Common options for dpkg and dpkg_deb"
293 depends on DPKG || DPKG_DEB
295 config FEATURE_DEB_TAR_GZ
296 bool "gzip debian packages (normal)"
297 default y if DPKG || DPKG_DEB
298 depends on DPKG || DPKG_DEB
300 This is the default compression method inside the debian ar file.
302 If you want compatibility with standard .deb's you should say yes here.
304 config FEATURE_DEB_TAR_BZ2
305 bool "bzip2 debian packages"
307 depends on DPKG || DPKG_DEB
309 This allows dpkg and dpkg-deb to extract deb's that are compressed internally
310 with bzip2 instead of gzip.
312 You only want this if you are creating your own custom debian packages that
313 use an internal control.tar.bz2 or data.tar.bz2.
315 config FEATURE_DEB_TAR_LZMA
316 bool "lzma debian packages"
318 depends on DPKG || DPKG_DEB
320 This allows dpkg and dpkg-deb to extract deb's that are compressed
321 internally with lzma instead of gzip.
323 You only want this if you are creating your own custom debian
324 packages that use an internal control.tar.lzma or data.tar.lzma.