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author | Sergey Poznyakoff <gray@gnu.org.ua> | 2003-11-21 14:58:17 +0000 |
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committer | Sergey Poznyakoff <gray@gnu.org.ua> | 2003-11-21 14:58:17 +0000 |
commit | c855f03150358ae41b3493e3e2f0844fadf74b51 (patch) | |
tree | fcc4fe0a928a0cd1a9dd3a55c9859b4854da75ff /README | |
parent | cabcd48afa08e892f8628c98a5558af136b21ade (diff) | |
download | cpio-c855f03150358ae41b3493e3e2f0844fadf74b51.tar.gz cpio-c855f03150358ae41b3493e3e2f0844fadf74b51.tar.bz2 |
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Diffstat (limited to 'README')
-rw-r--r-- | README | 71 |
1 files changed, 71 insertions, 0 deletions
@@ -0,0 +1,71 @@ +This is GNU cpio, a program to manage archives of files. +As of version 2.0, it supports the features of the System V release 4 +cpio, including support for tar archives. + +This package also includes rmt, the remote tape server, and mt, a tape +drive control program; these two programs will only be compiled if +your system supports remote command execution, and tape drive control +operations, respectively. + +See the file INSTALL for compilation and installation instructions for Unix. + +For non-Unix systems [ Note: The non-Unix makefiles have not been tested + for this release ] + +makefile.pc is a makefile for Turbo C or C++ or Borland C++ on MS-DOS. + +makefile.os2 is a makefile for MS C and GNU C (emx/gcc) on OS/2. +cpio.def is a linker definition file for the MS C OS/2 version. + + +The main advantages of GNU cpio over Unix versions are: + +* It can access tape drives on other hosts using TCP/IP. + +* `-o' and `-p' can copy symbolic links either as symbolic links or, +with `-L', as the files they point to. + +* `-i' automatically recognizes the archive format and tries to +recover from corrupted archives. + +* The output of '-itv' looks like 'ls -l'. + +* It accepts long-named options as well as traditional +single-character options. + +A few features of other versions of cpio are missing from GNU cpio, including: + +* The `-6' option to support Sixth Edition Unix cpio archives with `-i'. + +* An option to limit volume size, like afio -s. + + +GNU cpio supports the POSIX.1 "ustar" tar format. GNU tar supports a +somewhat different, early draft of that format. That draft format has +a slightly different magic number in the tar header and doesn't +include the path prefix part of the header, which allows storing file +names that are longer than 100 characters. GNU cpio knows to +recognize the nonstandard GNU tar "ustar" archives. + +The following patch to GNU tar 1.11.1 makes GNU tar recognize standard +"ustar" archives, such as GNU cpio produces, except that it won't use +the path prefix. Without this patch, GNU tar thinks that standard +"ustar" archives are old-format tar archives and can not use the extra +information that "ustar" format contains. If you use this patch, +remember that you will lose the beginnings of paths that are longer +than 100 characters. That's why it's not an official part of GNU tar. +(Adding support for the path prefix to GNU tar is not trivial.) + +--- list.c.orig Mon Sep 14 17:04:03 1992 ++++ list.c Wed Oct 14 14:02:28 1992 +@@ -439,7 +439,7 @@ + st->st_ctime = from_oct(1+12, header->header.ctime); + } + +- if (0==strcmp(header->header.magic, TMAGIC)) { ++ if (0==strncmp(header->header.magic, TMAGIC, 5)) { + /* Unix Standard tar archive */ + *stdp = 1; + if (wantug) { + +Mail suggestions and bug reports for GNU cpio to bug-cpio@gnu.org. |