| 1 | This is GNU cpio, a program to manage archives of files.
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| 2 | As of version 2.0, it supports the features of the System V release 4
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| 3 | cpio, including support for tar archives.
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| 4 |
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| 5 | This package also includes rmt, the remote tape server, and mt, a tape
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| 6 | drive control program; these two programs will only be compiled if
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| 7 | your system supports remote command execution, and tape drive control
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| 8 | operations, respectively.
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| 9 |
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| 10 | See the file INSTALL for compilation and installation instructions for Unix.
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| 11 |
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| 12 | For non-Unix systems [ Note: The non-Unix makefiles have not been tested
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| 13 | for this release ]
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| 14 |
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| 15 | makefile.pc is a makefile for Turbo C or C++ or Borland C++ on MS-DOS.
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| 16 |
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| 17 | makefile.os2 is a makefile for MS C and GNU C (emx/gcc) on OS/2.
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| 18 | cpio.def is a linker definition file for the MS C OS/2 version.
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| 19 |
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| 20 |
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| 21 | The main advantages of GNU cpio over Unix versions are:
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| 22 |
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| 23 | * It can access tape drives on other hosts using TCP/IP.
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| 24 |
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| 25 | * `-o' and `-p' can copy symbolic links either as symbolic links or,
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| 26 | with `-L', as the files they point to.
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| 27 |
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| 28 | * `-i' automatically recognizes the archive format and tries to
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| 29 | recover from corrupted archives.
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| 30 |
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| 31 | * The output of '-itv' looks like 'ls -l'.
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| 32 |
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| 33 | * It accepts long-named options as well as traditional
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| 34 | single-character options.
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| 35 |
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| 36 | A few features of other versions of cpio are missing from GNU cpio, including:
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| 37 |
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| 38 | * The `-6' option to support Sixth Edition Unix cpio archives with `-i'.
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| 39 |
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| 40 | * An option to limit volume size, like afio -s.
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| 41 |
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| 42 |
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| 43 | GNU cpio supports the POSIX.1 "ustar" tar format. GNU tar supports a
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| 44 | somewhat different, early draft of that format. That draft format has
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| 45 | a slightly different magic number in the tar header and doesn't
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| 46 | include the path prefix part of the header, which allows storing file
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| 47 | names that are longer than 100 characters. GNU cpio knows to
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| 48 | recognize the nonstandard GNU tar "ustar" archives.
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| 49 |
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| 50 | The following patch to GNU tar 1.11.1 makes GNU tar recognize standard
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| 51 | "ustar" archives, such as GNU cpio produces, except that it won't use
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| 52 | the path prefix. Without this patch, GNU tar thinks that standard
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| 53 | "ustar" archives are old-format tar archives and can not use the extra
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| 54 | information that "ustar" format contains. If you use this patch,
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| 55 | remember that you will lose the beginnings of paths that are longer
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| 56 | than 100 characters. That's why it's not an official part of GNU tar.
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| 57 | (Adding support for the path prefix to GNU tar is not trivial.)
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| 58 |
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| 59 | --- list.c.orig Mon Sep 14 17:04:03 1992
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| 60 | +++ list.c Wed Oct 14 14:02:28 1992
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| 61 | @@ -439,7 +439,7 @@
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| 62 | st->st_ctime = from_oct(1+12, header->header.ctime);
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| 63 | }
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| 64 |
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| 65 | - if (0==strcmp(header->header.magic, TMAGIC)) {
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| 66 | + if (0==strncmp(header->header.magic, TMAGIC, 5)) {
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| 67 | /* Unix Standard tar archive */
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| 68 | *stdp = 1;
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| 69 | if (wantug) {
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| 70 |
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| 71 | Mail suggestions and bug reports for GNU cpio to bug-cpio@gnu.org.
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