590 lines
14 KiB
C
590 lines
14 KiB
C
/* Update a tar archive.
|
|
Copyright (C) 1988, 1992 Free Software Foundation
|
|
|
|
This file is part of GNU Tar.
|
|
|
|
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.
|
|
|
|
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 GNU Tar; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$Id: update.c,v 1.5 2001/01/05 03:54:35 lukem Exp $";
|
|
#endif /* not lint */
|
|
|
|
/* JF implement the 'r' 'u' and 'A' options for tar. */
|
|
/* The 'A' option is my own invention: It means that the file-names are
|
|
tar files, and they should simply be appended to the end of the archive.
|
|
No attempt is made to block the reads from the args; if they're on raw
|
|
tape or something like that, it'll probably lose. . . */
|
|
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#ifndef STDC_HEADERS
|
|
extern int errno;
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_MTIO_H
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mtio.h>
|
|
#endif
|
|
|
|
#ifdef BSD42
|
|
#include <sys/file.h>
|
|
#else
|
|
#ifndef V7
|
|
#include <fcntl.h>
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef __MSDOS__
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
#endif
|
|
|
|
#define STDIN 0
|
|
#define STDOUT 1
|
|
|
|
#include "tar.h"
|
|
#include "port.h"
|
|
#include "rmt.h"
|
|
|
|
int time_to_start_writing = 0; /* We've hit the end of the old stuff,
|
|
and its time to start writing new stuff
|
|
to the tape. This involves seeking
|
|
back one block and re-writing the current
|
|
block (which has been changed). */
|
|
|
|
char *output_start; /* Pointer to where we started to write in
|
|
the first block we write out. This is used
|
|
if we can't backspace the output and have
|
|
to null out the first part of the block */
|
|
|
|
extern void skip_file ();
|
|
extern void skip_extended_headers ();
|
|
|
|
extern union record *head;
|
|
extern struct stat hstat;
|
|
|
|
void append_file ();
|
|
void close_archive ();
|
|
int confirm ();
|
|
void decode_header ();
|
|
void fl_read ();
|
|
void fl_write ();
|
|
void flush_archive ();
|
|
int move_arch ();
|
|
struct name *name_scan ();
|
|
char *name_from_list ();
|
|
void name_expand ();
|
|
void name_gather ();
|
|
void names_notfound ();
|
|
void open_archive ();
|
|
int read_header ();
|
|
void reset_eof ();
|
|
void write_block ();
|
|
void write_eot ();
|
|
|
|
/* Implement the 'r' (add files to end of archive), and 'u' (add files to
|
|
end of archive if they arent there, or are more up to date than the
|
|
version in the archive.) commands.*/
|
|
void
|
|
update_archive ()
|
|
{
|
|
int found_end = 0;
|
|
int status = 3;
|
|
int prev_status;
|
|
char *p;
|
|
struct name *name;
|
|
extern void dump_file ();
|
|
|
|
name_gather ();
|
|
if (cmd_mode == CMD_UPDATE)
|
|
name_expand ();
|
|
open_archive (2); /* Open for updating */
|
|
|
|
do
|
|
{
|
|
prev_status = status;
|
|
status = read_header ();
|
|
switch (status)
|
|
{
|
|
case EOF:
|
|
found_end = 1;
|
|
break;
|
|
|
|
case 0: /* A bad record */
|
|
userec (head);
|
|
switch (prev_status)
|
|
{
|
|
case 3:
|
|
msg ("This doesn't look like a tar archive.");
|
|
/* FALL THROUGH */
|
|
case 2:
|
|
case 1:
|
|
msg ("Skipping to next header");
|
|
case 0:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* A good record */
|
|
case 1:
|
|
/* printf("File %s\n",head->header.name); */
|
|
/* head->header.name[NAMSIZ-1]='\0'; */
|
|
if (cmd_mode == CMD_UPDATE && (name = name_scan (current_file_name)))
|
|
{
|
|
|
|
/* struct stat hstat; */
|
|
struct stat nstat;
|
|
int head_standard;
|
|
|
|
decode_header (head, &hstat, &head_standard, 0);
|
|
if (stat (current_file_name, &nstat) < 0)
|
|
{
|
|
msg_perror ("can't stat %s:", current_file_name);
|
|
}
|
|
else
|
|
{
|
|
if (hstat.st_mtime >= nstat.st_mtime)
|
|
name->found++;
|
|
}
|
|
}
|
|
userec (head);
|
|
if (head->header.isextended)
|
|
skip_extended_headers ();
|
|
skip_file ((long) hstat.st_size);
|
|
break;
|
|
|
|
case 2:
|
|
ar_record = head;
|
|
found_end = 1;
|
|
break;
|
|
}
|
|
}
|
|
while (!found_end);
|
|
|
|
reset_eof ();
|
|
time_to_start_writing = 1;
|
|
output_start = ar_record->charptr;
|
|
|
|
while (p = name_from_list ())
|
|
{
|
|
if (f_confirm && !confirm ("add", p))
|
|
continue;
|
|
if (cmd_mode == CMD_CAT)
|
|
append_file (p);
|
|
else
|
|
dump_file (p, -1, 1);
|
|
}
|
|
|
|
write_eot ();
|
|
close_archive ();
|
|
names_notfound ();
|
|
}
|
|
|
|
/* Catenate file p to the archive without creating a header for it. It had
|
|
better be a tar file or the archive is screwed */
|
|
|
|
void
|
|
append_file (p)
|
|
char *p;
|
|
{
|
|
int fd;
|
|
struct stat statbuf;
|
|
long bytes_left;
|
|
union record *start;
|
|
long bufsiz, count;
|
|
|
|
if (0 != stat (p, &statbuf) || (fd = open (p, O_RDONLY | O_BINARY)) < 0)
|
|
{
|
|
msg_perror ("can't open file %s", p);
|
|
errors++;
|
|
return;
|
|
}
|
|
|
|
bytes_left = statbuf.st_size;
|
|
|
|
while (bytes_left > 0)
|
|
{
|
|
start = findrec ();
|
|
bufsiz = endofrecs ()->charptr - start->charptr;
|
|
if (bytes_left < bufsiz)
|
|
{
|
|
bufsiz = bytes_left;
|
|
count = bufsiz % RECORDSIZE;
|
|
if (count)
|
|
bzero (start->charptr + bytes_left, (int) (RECORDSIZE - count));
|
|
}
|
|
count = read (fd, start->charptr, bufsiz);
|
|
if (count < 0)
|
|
{
|
|
msg_perror ("read error at byte %lld reading %d bytes in file %s", (long long)(statbuf.st_size - bytes_left), bufsiz, p);
|
|
exit (EX_ARGSBAD); /* FOO */
|
|
}
|
|
bytes_left -= count;
|
|
userec (start + (count - 1) / RECORDSIZE);
|
|
if (count != bufsiz)
|
|
{
|
|
msg ("%s: file shrunk by %d bytes, yark!", p, bytes_left);
|
|
abort ();
|
|
}
|
|
}
|
|
(void) close (fd);
|
|
}
|
|
|
|
#ifdef DONTDEF
|
|
bprint (fp, buf, num)
|
|
FILE *fp;
|
|
char *buf;
|
|
{
|
|
int c;
|
|
|
|
if (num == 0 || num == -1)
|
|
return;
|
|
fputs (" '", fp);
|
|
while (num--)
|
|
{
|
|
c = *buf++;
|
|
if (c == '\\')
|
|
fputs ("\\\\", fp);
|
|
else if (c >= ' ' && c <= '~')
|
|
putc (c, fp);
|
|
else
|
|
switch (c)
|
|
{
|
|
case '\n':
|
|
fputs ("\\n", fp);
|
|
break;
|
|
case '\r':
|
|
fputs ("\\r", fp);
|
|
break;
|
|
case '\b':
|
|
fputs ("\\b", fp);
|
|
break;
|
|
case '\0':
|
|
/* fputs("\\-",fp); */
|
|
break;
|
|
default:
|
|
fprintf (fp, "\\%03o", c);
|
|
break;
|
|
}
|
|
}
|
|
fputs ("'\n", fp);
|
|
}
|
|
|
|
#endif
|
|
|
|
int number_of_blocks_read = 0;
|
|
|
|
int number_of_new_records = 0;
|
|
int number_of_records_needed = 0;
|
|
|
|
union record *new_block = 0;
|
|
union record *save_block = 0;
|
|
|
|
void
|
|
junk_archive ()
|
|
{
|
|
int found_stuff = 0;
|
|
int status = 3;
|
|
int prev_status;
|
|
struct name *name;
|
|
|
|
/* int dummy_head; */
|
|
int number_of_records_to_skip = 0;
|
|
int number_of_records_to_keep = 0;
|
|
int number_of_kept_records_in_block;
|
|
int sub_status;
|
|
extern int write_archive_to_stdout;
|
|
|
|
/* fprintf(stderr,"Junk files\n"); */
|
|
name_gather ();
|
|
open_archive (2);
|
|
|
|
while (!found_stuff)
|
|
{
|
|
prev_status = status;
|
|
status = read_header ();
|
|
switch (status)
|
|
{
|
|
case EOF:
|
|
found_stuff = 1;
|
|
break;
|
|
|
|
case 0:
|
|
userec (head);
|
|
switch (prev_status)
|
|
{
|
|
case 3:
|
|
msg ("This doesn't look like a tar archive.");
|
|
/* FALL THROUGH */
|
|
case 2:
|
|
case 1:
|
|
msg ("Skipping to next header");
|
|
/* FALL THROUGH */
|
|
case 0:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
/* head->header.name[NAMSIZ-1] = '\0'; */
|
|
/* fprintf(stderr,"file %s\n",head->header.name); */
|
|
if ((name = name_scan (current_file_name)) == (struct name *) 0)
|
|
{
|
|
userec (head);
|
|
/* fprintf(stderr,"Skip %ld\n",(long)(hstat.st_size)); */
|
|
if (head->header.isextended)
|
|
skip_extended_headers ();
|
|
skip_file ((long) (hstat.st_size));
|
|
break;
|
|
}
|
|
name->found = 1;
|
|
found_stuff = 2;
|
|
break;
|
|
|
|
case 2:
|
|
found_stuff = 1;
|
|
break;
|
|
}
|
|
}
|
|
/* fprintf(stderr,"Out of first loop\n"); */
|
|
|
|
if (found_stuff != 2)
|
|
{
|
|
write_eot ();
|
|
close_archive ();
|
|
names_notfound ();
|
|
return;
|
|
}
|
|
|
|
if (write_archive_to_stdout)
|
|
write_archive_to_stdout = 0;
|
|
new_block = (union record *) malloc (blocksize);
|
|
if (new_block == 0)
|
|
{
|
|
msg ("Can't allocate secondary block of %d bytes", blocksize);
|
|
exit (EX_SYSTEM);
|
|
}
|
|
|
|
/* Save away records before this one in this block */
|
|
number_of_new_records = ar_record - ar_block;
|
|
number_of_records_needed = blocking - number_of_new_records;
|
|
if (number_of_new_records)
|
|
bcopy ((void *) ar_block, (void *) new_block, (number_of_new_records) * RECORDSIZE);
|
|
|
|
/* fprintf(stderr,"Saved %d recs, need %d more\n",number_of_new_records,number_of_records_needed); */
|
|
userec (head);
|
|
if (head->header.isextended)
|
|
skip_extended_headers ();
|
|
skip_file ((long) (hstat.st_size));
|
|
found_stuff = 0;
|
|
/* goto flush_file; */
|
|
|
|
for (;;)
|
|
{
|
|
/* Fill in a block */
|
|
/* another_file: */
|
|
if (ar_record == ar_last)
|
|
{
|
|
/* fprintf(stderr,"New block\n"); */
|
|
flush_archive ();
|
|
number_of_blocks_read++;
|
|
}
|
|
sub_status = read_header ();
|
|
/* fprintf(stderr,"Header type %d\n",sub_status); */
|
|
|
|
if (sub_status == 2 && f_ignorez)
|
|
{
|
|
userec (head);
|
|
continue;
|
|
}
|
|
if (sub_status == EOF || sub_status == 2)
|
|
{
|
|
found_stuff = 1;
|
|
bzero (new_block[number_of_new_records].charptr, RECORDSIZE * number_of_records_needed);
|
|
number_of_new_records += number_of_records_needed;
|
|
number_of_records_needed = 0;
|
|
write_block (0);
|
|
break;
|
|
}
|
|
|
|
if (sub_status == 0)
|
|
{
|
|
msg ("Deleting non-header from archive.");
|
|
userec (head);
|
|
continue;
|
|
}
|
|
|
|
/* Found another header. Yipee! */
|
|
/* head->header.name[NAMSIZ-1] = '\0'; */
|
|
/* fprintf(stderr,"File %s ",head->header.name); */
|
|
if (name = name_scan (current_file_name))
|
|
{
|
|
name->found = 1;
|
|
/* fprintf(stderr,"Flush it\n"); */
|
|
/* flush_file: */
|
|
/* decode_header(head,&hstat,&dummy_head,0); */
|
|
userec (head);
|
|
number_of_records_to_skip = (hstat.st_size + RECORDSIZE - 1) / RECORDSIZE;
|
|
/* fprintf(stderr,"Flushing %d recs from %s\n",number_of_records_to_skip,head->header.name); */
|
|
|
|
while (ar_last - ar_record <= number_of_records_to_skip)
|
|
{
|
|
|
|
/* fprintf(stderr,"Block: %d <= %d ",ar_last-ar_record,number_of_records_to_skip); */
|
|
number_of_records_to_skip -= (ar_last - ar_record);
|
|
flush_archive ();
|
|
number_of_blocks_read++;
|
|
/* fprintf(stderr,"Block %d left\n",number_of_records_to_skip); */
|
|
}
|
|
ar_record += number_of_records_to_skip;
|
|
/* fprintf(stderr,"Final %d\n",number_of_records_to_skip); */
|
|
number_of_records_to_skip = 0;
|
|
continue;
|
|
}
|
|
|
|
/* copy_header: */
|
|
new_block[number_of_new_records] = *head;
|
|
number_of_new_records++;
|
|
number_of_records_needed--;
|
|
number_of_records_to_keep = (hstat.st_size + RECORDSIZE - 1) / RECORDSIZE;
|
|
userec (head);
|
|
if (number_of_records_needed == 0)
|
|
write_block (1);
|
|
/* copy_data: */
|
|
number_of_kept_records_in_block = ar_last - ar_record;
|
|
if (number_of_kept_records_in_block > number_of_records_to_keep)
|
|
number_of_kept_records_in_block = number_of_records_to_keep;
|
|
|
|
/* fprintf(stderr,"Need %d kept_in %d keep %d\n",blocking,number_of_kept_records_in_block,number_of_records_to_keep); */
|
|
|
|
while (number_of_records_to_keep)
|
|
{
|
|
int n;
|
|
|
|
if (ar_record == ar_last)
|
|
{
|
|
/* fprintf(stderr,"Flush. . .\n"); */
|
|
fl_read ();
|
|
number_of_blocks_read++;
|
|
ar_record = ar_block;
|
|
number_of_kept_records_in_block = blocking;
|
|
if (number_of_kept_records_in_block > number_of_records_to_keep)
|
|
number_of_kept_records_in_block = number_of_records_to_keep;
|
|
}
|
|
n = number_of_kept_records_in_block;
|
|
if (n > number_of_records_needed)
|
|
n = number_of_records_needed;
|
|
|
|
/* fprintf(stderr,"Copying %d\n",n); */
|
|
bcopy ((void *) ar_record, (void *) (new_block + number_of_new_records), n * RECORDSIZE);
|
|
number_of_new_records += n;
|
|
number_of_records_needed -= n;
|
|
ar_record += n;
|
|
number_of_records_to_keep -= n;
|
|
number_of_kept_records_in_block -= n;
|
|
/* fprintf(stderr,"Now new %d need %d keep %d keep_in %d rec %d/%d\n",
|
|
number_of_new_records,number_of_records_needed,number_of_records_to_keep,
|
|
number_of_kept_records_in_block,ar_record-ar_block,ar_last-ar_block); */
|
|
|
|
if (number_of_records_needed == 0)
|
|
{
|
|
write_block (1);
|
|
}
|
|
}
|
|
}
|
|
|
|
write_eot ();
|
|
close_archive ();
|
|
names_notfound ();
|
|
}
|
|
|
|
void
|
|
write_block (f)
|
|
int f;
|
|
{
|
|
/* fprintf(stderr,"Write block\n"); */
|
|
/* We've filled out a block. Write it out. */
|
|
|
|
/* Backspace back to where we started. . . */
|
|
if (archive != STDIN)
|
|
(void) move_arch (-(number_of_blocks_read + 1));
|
|
|
|
save_block = ar_block;
|
|
ar_block = new_block;
|
|
|
|
if (archive == STDIN)
|
|
archive = STDOUT;
|
|
fl_write ();
|
|
|
|
if (archive == STDOUT)
|
|
archive = STDIN;
|
|
ar_block = save_block;
|
|
|
|
if (f)
|
|
{
|
|
/* Move the tape head back to where we were */
|
|
if (archive != STDIN)
|
|
(void) move_arch (number_of_blocks_read);
|
|
number_of_blocks_read--;
|
|
}
|
|
|
|
number_of_records_needed = blocking;
|
|
number_of_new_records = 0;
|
|
}
|
|
|
|
/* Move archive descriptor by n blocks worth. If n is positive we move
|
|
forward, else we move negative. If its a tape, MTIOCTOP had better
|
|
work. If its something else, we try to seek on it. If we can't
|
|
seek, we lose! */
|
|
int
|
|
move_arch (n)
|
|
int n;
|
|
{
|
|
long cur;
|
|
|
|
#ifdef MTIOCTOP
|
|
struct mtop t;
|
|
int er;
|
|
|
|
if (n > 0)
|
|
{
|
|
t.mt_op = MTFSR;
|
|
t.mt_count = n;
|
|
}
|
|
else
|
|
{
|
|
t.mt_op = MTBSR;
|
|
t.mt_count = -n;
|
|
}
|
|
if ((er = rmtioctl (archive, MTIOCTOP, &t)) >= 0)
|
|
return 1;
|
|
if (errno == EIO && (er = rmtioctl (archive, MTIOCTOP, &t)) >= 0)
|
|
return 1;
|
|
#endif
|
|
|
|
cur = rmtlseek (archive, 0L, 1);
|
|
cur += blocksize * n;
|
|
|
|
/* fprintf(stderr,"Fore to %x\n",cur); */
|
|
if (rmtlseek (archive, cur, 0) != cur)
|
|
{
|
|
/* Lseek failed. Try a different method */
|
|
msg ("Couldn't re-position archive file.");
|
|
exit (EX_BADARCH);
|
|
}
|
|
return 3;
|
|
}
|