This commit is contained in:
Paul Eggert
1997-04-15 20:32:54 +00:00
parent d5452e3cd0
commit 63f2f45b88

474
src/tar.h
View File

@@ -1,293 +1,241 @@
/* Declarations for tar archives.
Copyright (C) 1988, 1992, 1993 Free Software Foundation
/* Format of tar archives.
Copyright (C) 1988, 92, 93, 94, 96, 97 Free Software Foundation, Inc.
This file is part of GNU Tar.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any later
version.
GNU Tar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
GNU Tar is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
You should have received a copy of the GNU General Public License
along with GNU Tar; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* GNU tar Archive Format description. */
#include "testpad.h"
/* If OLDGNU_COMPATIBILITY is not zero, tar produces archives which, by
default, are readable by older versions of GNU tar. This can be
overriden by using --posix; in this case, POSIXLY_CORRECT in environment
may be set for enforcing stricter conformance. If OLDGNU_COMPATIBILITY
is zero or undefined, tar will eventually produces archives which, by
default, POSIX compatible; then either using --posix or defining
POSIXLY_CORRECT enforces stricter conformance.
/* major() and minor() macros (among other things) defined here for hpux */
#ifdef hpux
#include <sys/mknod.h>
#endif
This #define will disappear in a few years. FP, June 1995. */
#define OLDGNU_COMPATIBILITY 1
/*
* Kludge for handling systems that can't cope with multiple
* external definitions of a variable. In ONE routine (tar.c),
* we #define TAR_EXTERN to null; here, we set it to "extern" if
* it is not already set.
*/
#ifndef TAR_EXTERN
#define TAR_EXTERN extern
#endif
/*---------------------------------------------.
| `tar' Header Block, from POSIX 1003.1-1990. |
`---------------------------------------------*/
/*
* Header block on tape.
*
* I'm going to use traditional DP naming conventions here.
* A "block" is a big chunk of stuff that we do I/O on.
* A "record" is a piece of info that we care about.
* Typically many "record"s fit into a "block".
*/
#define RECORDSIZE 512
#define NAMSIZ 100
#define TUNMLEN 32
#define TGNMLEN 32
#define SPARSE_EXT_HDR 21
#define SPARSE_IN_HDR 4
/* POSIX header. */
struct posix_header
{ /* byte offset */
char name[100]; /* 0 */
char mode[8]; /* 100 */
char uid[8]; /* 108 */
char gid[8]; /* 116 */
char size[12]; /* 124 */
char mtime[12]; /* 136 */
char chksum[8]; /* 148 */
char typeflag; /* 156 */
char linkname[100]; /* 157 */
char magic[6]; /* 257 */
char version[2]; /* 263 */
char uname[32]; /* 265 */
char gname[32]; /* 297 */
char devmajor[8]; /* 329 */
char devminor[8]; /* 337 */
char prefix[155]; /* 345 */
/* 500 */
};
#define TMAGIC "ustar" /* ustar and a null */
#define TMAGLEN 6
#define TVERSION "00" /* 00 and no null */
#define TVERSLEN 2
/* Values used in typeflag field. */
#define REGTYPE '0' /* regular file */
#define AREGTYPE '\0' /* regular file */
#define LNKTYPE '1' /* link */
#define SYMTYPE '2' /* reserved */
#define CHRTYPE '3' /* character special */
#define BLKTYPE '4' /* block special */
#define DIRTYPE '5' /* directory */
#define FIFOTYPE '6' /* FIFO special */
#define CONTTYPE '7' /* reserved */
/* Bits used in the mode field, values in octal. */
#define TSUID 04000 /* set UID on execution */
#define TSGID 02000 /* set GID on execution */
#define TSVTX 01000 /* reserved */
/* file permissions */
#define TUREAD 00400 /* read by owner */
#define TUWRITE 00200 /* write by owner */
#define TUEXEC 00100 /* execute/search by owner */
#define TGREAD 00040 /* read by group */
#define TGWRITE 00020 /* write by group */
#define TGEXEC 00010 /* execute/search by group */
#define TOREAD 00004 /* read by other */
#define TOWRITE 00002 /* write by other */
#define TOEXEC 00001 /* execute/search by other */
/*-------------------------------------.
| `tar' Header Block, GNU extensions. |
`-------------------------------------*/
/* In GNU tar, SYMTYPE is for to symbolic links, and CONTTYPE is for
contiguous files, so maybe disobeying the `reserved' comment in POSIX
header description. I suspect these were meant to be used this way, and
should not have really been `reserved' in the published standards. */
/* *BEWARE* *BEWARE* *BEWARE* that the following information is still
boiling, and may change. Even if the OLDGNU format description should be
accurate, the so-called GNU format is not yet fully decided. It is
surely meant to use only extensions allowed by POSIX, but the sketch
below repeats some ugliness from the OLDGNU format, which should rather
go away. Sparse files should be saved in such a way that they do *not*
require two passes at archive creation time. Huge files get some POSIX
fields to overflow, alternate solutions have to be sought for this. */
/* Descriptor for a single file hole. */
struct sparse
{
char offset[12];
char numbytes[12];
};
{ /* byte offset */
char offset[12]; /* 0 */
char numbytes[12]; /* 12 */
/* 24 */
};
struct sp_array
{
int offset;
int numbytes;
};
/* Sparse files are not supported in POSIX ustar format. For sparse files
with a POSIX header, a GNU extra header is provided which holds overall
sparse information and a few sparse descriptors. When an old GNU header
replaces both the POSIX header and the GNU extra header, it holds some
sparse descriptors too. Whether POSIX or not, if more sparse descriptors
are still needed, they are put into as many successive sparse headers as
necessary. The following constants tell how many sparse descriptors fit
in each kind of header able to hold them. */
union record
{
char charptr[RECORDSIZE];
struct header
{
char arch_name[NAMSIZ];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char linkflag;
char arch_linkname[NAMSIZ];
char magic[8];
char uname[TUNMLEN];
char gname[TGNMLEN];
char devmajor[8];
char devminor[8];
/* these following fields were added by JF for gnu */
/* and are NOT standard */
char atime[12];
char ctime[12];
char offset[12];
char longnames[4];
#ifdef NEEDPAD
char pad;
#endif
struct sparse sp[SPARSE_IN_HDR];
char isextended;
char realsize[12]; /* true size of the sparse file */
/* char ending_blanks[12];*//* number of nulls at the
end of the file, if any */
}
header;
struct extended_header
{
struct sparse sp[21];
char isextended;
}
ext_hdr;
};
#define SPARSES_IN_EXTRA_HEADER 16
#define SPARSES_IN_OLDGNU_HEADER 4
#define SPARSES_IN_SPARSE_HEADER 21
/* The checksum field is filled with this while the checksum is computed. */
#define CHKBLANKS " " /* 8 blanks, no null */
/* The GNU extra header contains some information GNU tar needs, but not
foreseen in POSIX header format. It is only used after a POSIX header
(and never with old GNU headers), and immediately follows this POSIX
header, when typeflag is a letter rather than a digit, so signaling a GNU
extension. */
/* The magic field is filled with this if uname and gname are valid. */
#define TMAGIC "ustar " /* 7 chars and a null */
struct extra_header
{ /* byte offset */
char atime[12]; /* 0 */
char ctime[12]; /* 12 */
char offset[12]; /* 24 */
char realsize[12]; /* 36 */
char longnames[4]; /* 48 */
char unused_pad1[68]; /* 52 */
struct sparse sp[SPARSES_IN_EXTRA_HEADER];
/* 120 */
char isextended; /* 504 */
/* 505 */
};
/* The linkflag defines the type of file */
#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compat */
#define LF_NORMAL '0' /* Normal disk file */
#define LF_LINK '1' /* Link to previously dumped file */
#define LF_SYMLINK '2' /* Symbolic link */
#define LF_CHR '3' /* Character special file */
#define LF_BLK '4' /* Block special file */
#define LF_DIR '5' /* Directory */
#define LF_FIFO '6' /* FIFO special file */
#define LF_CONTIG '7' /* Contiguous file */
/* Further link types may be defined later. */
/* Extension header for sparse files, used immediately after the GNU extra
header, and used only if all sparse information cannot fit into that
extra header. There might even be many such extension headers, one after
the other, until all sparse information has been recorded. */
/* Note that the standards committee allows only capital A through
capital Z for user-defined expansion. This means that defining something
as, say '8' is a *bad* idea. */
#define LF_DUMPDIR 'D' /* This is a dir entry that contains
the names of files that were in
the dir at the time the dump
was made */
#define LF_LONGLINK 'K' /* Identifies the NEXT file on the tape
as having a long linkname */
#define LF_LONGNAME 'L' /* Identifies the NEXT file on the tape
as having a long name. */
#define LF_MULTIVOL 'M' /* This is the continuation
of a file that began on another
volume */
#define LF_NAMES 'N' /* For storing filenames that didn't
fit in 100 characters */
#define LF_SPARSE 'S' /* This is for sparse files */
#define LF_VOLHDR 'V' /* This file is a tape/volume header */
/* Ignore it on extraction */
struct sparse_header
{ /* byte offset */
struct sparse sp[SPARSES_IN_SPARSE_HEADER];
/* 0 */
char isextended; /* 504 */
/* 505 */
};
/*
* Exit codes from the "tar" program
*/
#define EX_SUCCESS 0 /* success! */
#define EX_ARGSBAD 1 /* invalid args */
#define EX_BADFILE 2 /* invalid filename */
#define EX_BADARCH 3 /* bad archive */
#define EX_SYSTEM 4 /* system gave unexpected error */
#define EX_BADVOL 5 /* Special error code means
Tape volume doesn't match the one
specified on the command line */
/* The old GNU format header conflicts with POSIX format in such a way that
POSIX archives may fool old GNU tar's, and POSIX tar's might well be
fooled by old GNU tar archives. An old GNU format header uses the space
used by the prefix field in a POSIX header, and cumulates information
normally found in a GNU extra header. With an old GNU tar header, we
never see any POSIX header nor GNU extra header. Supplementary sparse
headers are allowed, however. */
/*
* Global variables
*/
TAR_EXTERN union record *ar_block; /* Start of block of archive */
TAR_EXTERN union record *ar_record; /* Current record of archive */
TAR_EXTERN union record *ar_last; /* Last+1 record of archive block */
TAR_EXTERN char ar_reading; /* 0 writing, !0 reading archive */
TAR_EXTERN int blocking; /* Size of each block, in records */
TAR_EXTERN int blocksize; /* Size of each block, in bytes */
TAR_EXTERN char *info_script; /* Script to run at end of each tape change */
TAR_EXTERN char *name_file; /* File containing names to work on */
TAR_EXTERN char filename_terminator; /* \n or \0. */
TAR_EXTERN char *tar; /* Name of this program */
TAR_EXTERN struct sp_array *sparsearray; /* Pointer to the start of the scratch space */
TAR_EXTERN int sp_array_size; /* Initial size of the sparsearray */
TAR_EXTERN int tot_written; /* Total written to output */
TAR_EXTERN struct re_pattern_buffer
*label_pattern; /* compiled regex for extract label */
TAR_EXTERN char **ar_files; /* list of tape drive names */
TAR_EXTERN int n_ar_files; /* number of tape drive names */
TAR_EXTERN int cur_ar_file; /* tape drive currently being used */
TAR_EXTERN int ar_files_len; /* malloced size of ar_files */
TAR_EXTERN char *current_file_name, *current_link_name;
struct oldgnu_header
{ /* byte offset */
char unused_pad1[345]; /* 0 */
char atime[12]; /* 345 */
char ctime[12]; /* 357 */
char offset[12]; /* 369 */
char longnames[4]; /* 381 */
char unused_pad2; /* 385 */
struct sparse sp[SPARSES_IN_OLDGNU_HEADER];
/* 386 */
char isextended; /* 482 */
char realsize[12]; /* 483 */
/* 495 */
};
/*
* Flags from the command line
*/
TAR_EXTERN int cmd_mode;
#define CMD_NONE 0
#define CMD_CAT 1 /* -A */
#define CMD_CREATE 2 /* -c */
#define CMD_DIFF 3 /* -d */
#define CMD_APPEND 4 /* -r */
#define CMD_LIST 5 /* -t */
#define CMD_UPDATE 6 /* -u */
#define CMD_EXTRACT 7 /* -x */
#define CMD_DELETE 8 /* -D */
#define CMD_VERSION 9 /* --version */
/* OLDGNU_MAGIC uses both magic and version fields, which are contiguous.
Found in an archive, it indicates an old GNU header format, which will be
hopefully become obsolescent. With OLDGNU_MAGIC, uname and gname are
valid, though the header is not truly POSIX conforming. */
#define OLDGNU_MAGIC "ustar " /* 7 chars and a null */
/* The standards committee allows only capital A through capital Z for
user-defined expansion. */
TAR_EXTERN int f_reblock; /* -B */
#if 0
TAR_EXTERN char f_dironly; /* -D */
#endif
TAR_EXTERN int f_run_script_at_end; /* -F */
TAR_EXTERN int f_gnudump; /* -G */
TAR_EXTERN int f_follow_links; /* -h */
TAR_EXTERN int f_ignorez; /* -i */
TAR_EXTERN int f_keep; /* -k */
TAR_EXTERN int f_startfile; /* -K */
TAR_EXTERN int f_local_filesys; /* -l */
TAR_EXTERN int tape_length; /* -L */
TAR_EXTERN int f_modified; /* -m */
TAR_EXTERN int f_multivol; /* -M */
TAR_EXTERN int f_new_files; /* -N */
TAR_EXTERN int f_oldarch; /* -o */
TAR_EXTERN int f_exstdout; /* -O */
TAR_EXTERN int f_use_protection;/* -p */
TAR_EXTERN int f_absolute_paths;/* -P */
TAR_EXTERN int f_sayblock; /* -R */
TAR_EXTERN int f_sorted_names; /* -s */
TAR_EXTERN int f_sparse_files; /* -S ... JK */
TAR_EXTERN int f_namefile; /* -T */
TAR_EXTERN int f_verbose; /* -v */
TAR_EXTERN char *f_volhdr; /* -V */
TAR_EXTERN int f_confirm; /* -w */
TAR_EXTERN int f_verify; /* -W */
TAR_EXTERN int f_exclude; /* -X */
TAR_EXTERN char *f_compressprog; /* -z and -Z */
TAR_EXTERN int f_do_chown; /* --do-chown */
TAR_EXTERN int f_totals; /* --totals */
TAR_EXTERN int f_remove_files; /* --remove-files */
TAR_EXTERN int f_ignore_failed_read; /* --ignore-failed-read */
TAR_EXTERN int f_checkpoint; /* --checkpoint */
TAR_EXTERN int f_show_omitted_dirs; /* --show-omitted-dirs */
TAR_EXTERN char *f_volno_file; /* --volno-file */
TAR_EXTERN int f_force_local; /* --force-local */
TAR_EXTERN int f_atime_preserve;/* --atime-preserve */
TAR_EXTERN int f_compress_block; /* --compress-block */
/* This is a dir entry that contains the names of files that were in the
dir at the time the dump was made. */
#define GNUTYPE_DUMPDIR 'D'
/*
* We default to Unix Standard format rather than 4.2BSD tar format.
* The code can actually produce all three:
* f_standard ANSI standard
* f_oldarch V7
* neither 4.2BSD
* but we don't bother, since 4.2BSD can read ANSI standard format anyway.
* The only advantage to the "neither" option is that we can cmp our
* output to the output of 4.2BSD tar, for debugging.
*/
#define f_standard (!f_oldarch)
/* Identifies the *next* file on the tape as having a long linkname. */
#define GNUTYPE_LONGLINK 'K'
/*
* Structure for keeping track of filenames and lists thereof.
*/
struct name
{
struct name *next;
short length; /* cached strlen(name) */
char found; /* A matching file has been found */
char firstch; /* First char is literally matched */
char regexp; /* This name is a regexp, not literal */
char *change_dir; /* JF set with the -C option */
char *dir_contents; /* JF for f_gnudump */
char fake; /* dummy entry */
char name[1];
};
/* Identifies the *next* file on the tape as having a long name. */
#define GNUTYPE_LONGNAME 'L'
TAR_EXTERN struct name *namelist; /* Points to first name in list */
TAR_EXTERN struct name *namelast; /* Points to last name in list */
/* This is the continuation of a file that began on another volume. */
#define GNUTYPE_MULTIVOL 'M'
TAR_EXTERN int archive; /* File descriptor for archive file */
TAR_EXTERN int errors; /* # of files in error */
/* For storing filenames that do not fit into the main header. */
#define GNUTYPE_NAMES 'N'
TAR_EXTERN char *gnu_dumpfile;
/* This is for sparse files. */
#define GNUTYPE_SPARSE 'S'
/*
* Error recovery stuff
*/
TAR_EXTERN char read_error_flag;
/* This file is a tape/volume header. Ignore it on extraction. */
#define GNUTYPE_VOLHDR 'V'
/*--------------------------------------.
| tar Header Block, overall structure. |
`--------------------------------------*/
/*
* Declarations of functions available to the world.
*/
union record *findrec ();
void userec ();
union record *endofrecs ();
void anno ();
/* tar files are made in basic blocks of this size. */
#define BLOCKSIZE 512
#if defined (HAVE_VPRINTF) && __STDC__
void msg (char *,...);
void msg_perror (char *,...);
#else
void msg ();
void msg_perror ();
#endif
enum archive_format
{
DEFAULT_FORMAT, /* format to be decided later */
V7_FORMAT, /* old V7 tar format */
OLDGNU_FORMAT, /* GNU format as per before tar 1.12 */
POSIX_FORMAT, /* restricted, pure POSIX format */
GNU_FORMAT /* POSIX format with GNU extensions */
};
union block
{
char buffer[BLOCKSIZE];
struct posix_header header;
struct extra_header extra_header;
struct oldgnu_header oldgnu_header;
struct sparse_header sparse_header;
};
/* End of Format description. */