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 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 The BusyBox bunzip2 applet is limited to de-compression only.
52 On an x86 system, this applet adds about 11K.
54 Unless you have a specific application which requires bunzip2, you
55 should probably say N here.
61 cpio is an archival utility program used to create, modify, and extract
62 contents from archives.
63 cpio has 110 bytes of overheads for every stored file.
65 This implementation of cpio can extract cpio archives created in the
66 "newc" or "crc" format, it cannot create or modify them.
68 Unless you have a specific application which requires cpio, you should
75 dpkg is a medium-level tool to install, build, remove and manage Debian packages.
77 This implementation of dpkg has a number of limitations, you should use the
78 official dpkg if possible.
80 config CONFIG_DPKG_DEB
84 dpkg-deb packs, unpacks and provides information about Debian archives.
86 This implementation of dpkg-deb cannot pack archives.
88 Unless you have a specific application which requires dpkg-deb, you should
91 config CONFIG_FEATURE_DPKG_DEB_EXTRACT_ONLY
92 bool " extract only (-x)"
94 depends on CONFIG_DPKG_DEB
96 This reduces dpkg-deb to the equivalent of "ar -p <deb> data.tar.gz | tar -zx".
97 However it saves space as none of the extra dpkg-deb, ar or tar options are
98 needed, they are linked to internally.
104 gunzip is used to decompress archives created by gzip.
105 You can use the `-t' option to test the integrity of
106 an archive, without decompressing it.
108 config CONFIG_FEATURE_GUNZIP_UNCOMPRESS
109 bool " Uncompress support"
111 depends on CONFIG_GUNZIP
113 Enable if you want gunzip to have the ability to decompress
114 archives created by the program compress (not much
121 gzip is used to compress files.
122 It's probably the most widely used UNIX compression program.
124 config CONFIG_RPM2CPIO
128 Converts an RPM file into a CPIO archive.
134 Mini RPM applet - queries and extracts
140 tar is an archiving program. It's commonly used with gzip to
141 create compressed archives. It's probably the most widely used
142 UNIX archive program.
144 config CONFIG_FEATURE_TAR_CREATE
145 bool " Enable archive creation"
147 depends on CONFIG_TAR
149 If you enable this option you'll be able to create
150 tar archives using the `-c' option.
152 config CONFIG_FEATURE_TAR_BZIP2
153 bool " Enable -j option to handle .tar.bz2 files"
155 depends on CONFIG_TAR
157 If you enable this option you'll be able to extract
158 archives compressed with bzip2.
160 config CONFIG_FEATURE_TAR_LZMA
161 bool " Enable -a option to handle .tar.lzma files"
163 depends on CONFIG_TAR
165 If you enable this option you'll be able to extract
166 archives compressed with lzma.
168 config CONFIG_FEATURE_TAR_FROM
169 bool " Enable -X (exclude from) and -T (include from) options)"
171 depends on CONFIG_TAR
173 If you enable this option you'll be able to specify
174 a list of files to include or exclude from an archive.
176 config CONFIG_FEATURE_TAR_GZIP
177 bool " Enable -z option"
179 depends on CONFIG_TAR
181 If you enable this option tar will be able to call gzip,
182 when creating or extracting tar gziped archives.
184 config CONFIG_FEATURE_TAR_COMPRESS
185 bool " Enable -Z option"
187 depends on CONFIG_TAR
189 If you enable this option tar will be able to call uncompress,
190 when extracting .tar.Z archives.
192 config CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
193 bool " Enable support for old tar header format"
195 depends on CONFIG_TAR
197 This option is required to unpack archives created in
198 the old GNU format; help to kill this old format by
199 repacking your ancient archives with the new format.
201 config CONFIG_FEATURE_TAR_GNU_EXTENSIONS
202 bool " Enable support for some GNU tar extensions"
204 depends on CONFIG_TAR
206 With this option busybox supports GNU long filenames and
209 config CONFIG_FEATURE_TAR_LONG_OPTIONS
210 bool " Enable long options"
212 depends on CONFIG_TAR
214 Enable use of long options, increases size by about 400 Bytes
216 config CONFIG_UNCOMPRESS
220 uncompress is used to decompress archives created by compress.
221 Not much used anymore, replaced by gzip/gunzip.
227 unlzma is a compression utility using the Lempel-Ziv-Markov chain
228 compression algorithm, and range coding. Compression
229 is generally considerably better than that achieved by the bzip2
232 The BusyBox unlzma applet is limited to de-compression only.
233 On an x86 system, this applet adds about 4K.
235 Unless you have a specific application which requires unlzma, you
236 should probably say N here.
238 config CONFIG_FEATURE_LZMA_FAST
239 bool " Optimze unlzma for speed"
241 depends on CONFIG_UNLZMA
243 This option reduce decompression time by about 33% at the cost of
250 unzip will list or extract files from a ZIP archive,
251 commonly found on DOS/WIN systems. The default behavior
252 (with no options) is to extract the archive into the
253 current directory. Use the `-d' option to extract to a
254 directory of your choice.
256 comment "Common options for cpio and tar"
257 depends on CONFIG_CPIO || CONFIG_TAR
259 config CONFIG_FEATURE_UNARCHIVE_TAPE
260 bool " Enable tape drive support"
262 depends on CONFIG_CPIO || CONFIG_TAR
264 I don't think this is needed anymore.
266 comment "Common options for dpkg and dpkg_deb"
267 depends on CONFIG_DPKG || CONFIG_DPKG_DEB
269 config CONFIG_FEATURE_DEB_TAR_GZ
270 bool " gzip debian packages (normal)"
271 default y if CONFIG_DPKG || CONFIG_DPKG_DEB
272 depends on CONFIG_DPKG || CONFIG_DPKG_DEB
274 This is the default compression method inside the debian ar file.
276 If you want compatibility with standard .deb's you should say yes here.
278 config CONFIG_FEATURE_DEB_TAR_BZ2
279 bool " bzip2 debian packages"
281 depends on CONFIG_DPKG || CONFIG_DPKG_DEB
283 This allows dpkg and dpkg-deb to extract deb's that are compressed internally
284 with bzip2 instead of gzip.
286 You only want this if you are creating your own custom debian packages that
287 use an internal control.tar.bz2 or data.tar.bz2.
289 config CONFIG_FEATURE_DEB_TAR_LZMA
290 bool " lzma debian packages"
292 depends on CONFIG_DPKG || CONFIG_DPKG_DEB
294 This allows dpkg and dpkg-deb to extract deb's that are compressed
295 internally with lzma instead of gzip.
297 You only want this if you are creating your own custom debian
298 packages that use an internal control.tar.lzma or data.tar.lzma.