546 lines
14 KiB
C
546 lines
14 KiB
C
/*-
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#ifndef lint
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static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <fts.h>
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#include "pax.h"
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#include "ftree.h"
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#include "extern.h"
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/*
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* routines to interface with the fts library function.
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*
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* file args supplied to pax are stored on a single linked list (of type FTREE)
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* and given to fts to be processed one at a time. pax "selects" files from
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* the expansion of each arg into the corresponding file tree (if the arg is a
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* directory, otherwise the node itself is just passed to pax). The selection
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* is modified by the -n and -u flags. The user is informed when a specific
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* file arg does not generate any selected files. -n keeps expanding the file
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* tree arg until one of its files is selected, then skips to the next file
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* arg. when the user does not supply the file trees as command line args to
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* pax, they are read from stdin
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*/
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static FTS *ftsp = NULL; /* curent FTS handle */
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static int ftsopts; /* options to be used on fts_open */
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static char *farray[2]; /* array for passing each arg to fts */
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static FTREE *fthead = NULL; /* head of linked list of file args */
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static FTREE *fttail = NULL; /* tail of linked list of file args */
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static FTREE *ftcur = NULL; /* current file arg being processed */
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static FTSENT *ftent = NULL; /* current file tree entry */
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static int ftree_skip; /* when set skip to next file arg */
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static int ftree_arg __P((void));
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/*
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* ftree_start()
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* initialize the options passed to fts_open() during this run of pax
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* options are based on the selection of pax options by the user
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* fts_start() also calls fts_arg() to open the first valid file arg. We
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* also attempt to reset directory access times when -t (tflag) is set.
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* Return:
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* 0 if there is at least one valid file arg to process, -1 otherwise
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*/
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#if __STDC__
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int
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ftree_start(void)
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#else
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int
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ftree_start()
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#endif
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{
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/*
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* set up the operation mode of fts, open the first file arg. We must
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* use FTS_NOCHDIR, as the user may have to open multiple archives and
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* if fts did a chdir off into the boondocks, we may create an archive
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* volume in an place where the user did not expect to.
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*/
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ftsopts = FTS_NOCHDIR;
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/*
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* optional user flags that effect file traversal
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* -H command line symlink follow only (half follow)
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* -L follow sylinks (logical)
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* -P do not follow sylinks (physical). This is the default.
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* -X do not cross over mount points
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* -t preserve access times on files read.
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* -n select only the first member of a file tree when a match is found
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* -d do not extract subtrees rooted at a directory arg.
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*/
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if (Lflag)
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ftsopts |= FTS_LOGICAL;
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else
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ftsopts |= FTS_PHYSICAL;
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if (Hflag)
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# ifdef NET2_FTS
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warn(0, "The -H flag is not supported on this version");
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# else
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ftsopts |= FTS_COMFOLLOW;
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# endif
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if (Xflag)
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ftsopts |= FTS_XDEV;
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if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) {
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warn(1, "Unable to allocate memory for file name buffer");
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return(-1);
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}
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if (ftree_arg() < 0)
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return(-1);
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if (tflag && (atdir_start() < 0))
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return(-1);
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return(0);
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}
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/*
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* ftree_add()
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* add the arg to the linked list of files to process. Each will be
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* processed by fts one at a time
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* Return:
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* 0 if added to the linked list, -1 if failed
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*/
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#if __STDC__
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int
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ftree_add(register char *str)
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#else
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int
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ftree_add(str)
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register char *str;
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#endif
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{
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register FTREE *ft;
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register int len;
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/*
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* simple check for bad args
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*/
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if ((str == NULL) || (*str == '\0')) {
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warn(0, "Invalid file name arguement");
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return(-1);
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}
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/*
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* allocate FTREE node and add to the end of the linked list (args are
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* processed in the same order they were passed to pax). Get rid of any
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* trailing / the user may pass us. (watch out for / by itself).
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*/
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if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) {
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warn(0, "Unable to allocate memory for filename");
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return(-1);
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}
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if (((len = strlen(str) - 1) > 0) && (str[len] == '/'))
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str[len] = '\0';
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ft->fname = str;
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ft->refcnt = 0;
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ft->fow = NULL;
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if (fthead == NULL) {
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fttail = fthead = ft;
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return(0);
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}
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fttail->fow = ft;
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fttail = ft;
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return(0);
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}
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/*
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* ftree_sel()
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* this entry has been selected by pax. bump up reference count and handle
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* -n and -d processing.
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*/
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#if __STDC__
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void
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ftree_sel(register ARCHD *arcn)
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#else
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void
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ftree_sel(arcn)
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register ARCHD *arcn;
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#endif
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{
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/*
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* set reference bit for this pattern. This linked list is only used
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* when file trees are supplied pax as args. The list is not used when
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* the trees are read from stdin.
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*/
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if (ftcur != NULL)
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ftcur->refcnt = 1;
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/*
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* if -n we are done with this arg, force a skip to the next arg when
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* pax asks for the next file in next_file().
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* if -d we tell fts only to match the directory (if the arg is a dir)
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* and not the entire file tree rooted at that point.
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*/
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if (nflag)
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ftree_skip = 1;
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if (!dflag || (arcn->type != PAX_DIR))
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return;
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if (ftent != NULL)
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(void)fts_set(ftsp, ftent, FTS_SKIP);
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}
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/*
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* ftree_chk()
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* called at end on pax execution. Prints all those file args that did not
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* have a selected member (reference count still 0)
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*/
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#if __STDC__
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void
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ftree_chk(void)
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#else
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void
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ftree_chk()
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#endif
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{
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register FTREE *ft;
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register int wban = 0;
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/*
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* make sure all dir access times were reset.
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*/
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if (tflag)
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atdir_end();
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/*
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* walk down list and check reference count. Print out those members
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* that never had a match
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*/
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for (ft = fthead; ft != NULL; ft = ft->fow) {
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if (ft->refcnt > 0)
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continue;
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if (wban == 0) {
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warn(1,"WARNING! These file names were not selected:");
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++wban;
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}
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(void)fprintf(stderr, "%s\n", ft->fname);
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}
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}
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/*
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* ftree_arg()
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* Get the next file arg for fts to process. Can be from either the linked
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* list or read from stdin when the user did not them as args to pax. Each
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* arg is processed until the first successful fts_open().
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* Return:
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* 0 when the next arg is ready to go, -1 if out of file args (or EOF on
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* stdin).
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*/
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#if __STDC__
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static int
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ftree_arg(void)
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#else
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static int
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ftree_arg()
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#endif
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{
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register char *pt;
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/*
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* close off the current file tree
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*/
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if (ftsp != NULL) {
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(void)fts_close(ftsp);
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ftsp = NULL;
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}
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/*
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* keep looping until we get a valid file tree to process. Stop when we
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* reach the end of the list (or get an eof on stdin)
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*/
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for(;;) {
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if (fthead == NULL) {
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/*
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* the user didn't supply any args, get the file trees
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* to process from stdin;
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*/
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if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL)
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return(-1);
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if ((pt = strchr(farray[0], '\n')) != NULL)
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*pt = '\0';
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} else {
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/*
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* the user supplied the file args as arguements to pax
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*/
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if (ftcur == NULL)
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ftcur = fthead;
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else if ((ftcur = ftcur->fow) == NULL)
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return(-1);
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farray[0] = ftcur->fname;
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}
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/*
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* watch it, fts wants the file arg stored in a array of char
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* ptrs, with the last one a null. we use a two element array
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* and set farray[0] to point at the buffer with the file name
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* in it. We cannnot pass all the file args to fts at one shot
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* as we need to keep a handle on which file arg generates what
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* files (the -n and -d flags need this). If the open is
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* successful, return a 0.
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*/
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if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL)
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break;
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}
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return(0);
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}
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/*
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* next_file()
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* supplies the next file to process in the supplied archd structure.
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* Return:
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* 0 when contents of arcn have been set with the next file, -1 when done.
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*/
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#if __STDC__
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int
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next_file(register ARCHD *arcn)
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#else
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int
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next_file(arcn)
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register ARCHD *arcn;
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#endif
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{
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register int cnt;
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time_t atime;
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time_t mtime;
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/*
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* ftree_sel() might have set the ftree_skip flag if the user has the
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* -n option and a file was selected from this file arg tree. (-n says
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* only one member is matched for each pattern) ftree_skip being 1
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* forces us to go to the next arg now.
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*/
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if (ftree_skip) {
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/*
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* clear and go to next arg
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*/
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ftree_skip = 0;
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if (ftree_arg() < 0)
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return(-1);
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}
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/*
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* loop until we get a valid file to process
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*/
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for(;;) {
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if ((ftent = fts_read(ftsp)) == NULL) {
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/*
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* out of files in this tree, go to next arg, if none
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* we are done
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*/
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if (ftree_arg() < 0)
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return(-1);
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continue;
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}
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/*
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* handle each type of fts_read() flag
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*/
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switch(ftent->fts_info) {
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case FTS_D:
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case FTS_DEFAULT:
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case FTS_F:
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case FTS_SL:
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case FTS_SLNONE:
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/*
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* these are all ok
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*/
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break;
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case FTS_DP:
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/*
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* already saw this directory. If the user wants file
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* access times reset, we use this to restore the
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* access time for this directory since this is the
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* last time we will see it in this file subtree
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* remember to force the time (this is -t on a read
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* directory, not a created directory).
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*/
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# ifdef NET2_FTS
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if (!tflag || (get_atdir(ftent->fts_statb.st_dev,
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ftent->fts_statb.st_ino, &mtime, &atime) < 0))
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# else
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if (!tflag || (get_atdir(ftent->fts_statp->st_dev,
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ftent->fts_statp->st_ino, &mtime, &atime) < 0))
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# endif
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continue;
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set_ftime(ftent->fts_path, mtime, atime, 1);
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continue;
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case FTS_DC:
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/*
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* fts claims a file system cycle
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*/
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warn(1,"File system cycle found at %s",ftent->fts_path);
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continue;
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case FTS_DNR:
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# ifdef NET2_FTS
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syswarn(1, errno,
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# else
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syswarn(1, ftent->fts_errno,
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# endif
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"Unable to read directory %s", ftent->fts_path);
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continue;
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case FTS_ERR:
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# ifdef NET2_FTS
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syswarn(1, errno,
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# else
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syswarn(1, ftent->fts_errno,
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# endif
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"File system traversal error");
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continue;
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case FTS_NS:
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case FTS_NSOK:
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# ifdef NET2_FTS
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syswarn(1, errno,
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# else
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syswarn(1, ftent->fts_errno,
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# endif
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"Unable to access %s", ftent->fts_path);
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continue;
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}
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/*
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* ok got a file tree node to process. copy info into arcn
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* structure (initialize as required)
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*/
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arcn->skip = 0;
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arcn->pad = 0;
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arcn->ln_nlen = 0;
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arcn->ln_name[0] = '\0';
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# ifdef NET2_FTS
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arcn->sb = ftent->fts_statb;
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# else
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arcn->sb = *(ftent->fts_statp);
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# endif
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/*
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* file type based set up and copy into the arcn struct
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* SIDE NOTE:
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* we try to reset the access time on all files and directories
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* we may read when the -t flag is specified. files are reset
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* when we close them after copying. we reset the directories
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* when we are done with their file tree (we also clean up at
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* end in case we cut short a file tree traversal). However
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* there is no way to reset access times on symlinks.
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*/
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switch(S_IFMT & arcn->sb.st_mode) {
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case S_IFDIR:
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arcn->type = PAX_DIR;
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if (!tflag)
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break;
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add_atdir(ftent->fts_path, arcn->sb.st_dev,
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arcn->sb.st_ino, arcn->sb.st_mtime,
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arcn->sb.st_atime);
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break;
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case S_IFCHR:
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arcn->type = PAX_CHR;
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break;
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case S_IFBLK:
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arcn->type = PAX_BLK;
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break;
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case S_IFREG:
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/*
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* only regular files with have data to store on the
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* archive. all others will store a zero length skip.
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* the skip field is used by pax for actual data it has
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* to read (or skip over).
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*/
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arcn->type = PAX_REG;
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arcn->skip = arcn->sb.st_size;
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break;
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case S_IFLNK:
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arcn->type = PAX_SLK;
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/*
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* have to read the symlink path from the file
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*/
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if ((cnt = readlink(ftent->fts_path, arcn->ln_name,
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PAXPATHLEN)) < 0) {
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syswarn(1, errno, "Unable to read symlink %s",
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ftent->fts_path);
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continue;
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}
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/*
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* set link name length, watch out readlink does not
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* allways null terminate the link path
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*/
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arcn->ln_name[cnt] = '\0';
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arcn->ln_nlen = cnt;
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break;
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case S_IFSOCK:
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/*
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* under BSD storing a socket is senseless but we will
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* let the format specific write function make the
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* decision of what to do with it.
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*/
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arcn->type = PAX_SCK;
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break;
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case S_IFIFO:
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arcn->type = PAX_FIF;
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break;
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}
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break;
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}
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/*
|
|
* copy file name, set file name length
|
|
*/
|
|
arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, PAXPATHLEN+1);
|
|
arcn->name[arcn->nlen] = '\0';
|
|
arcn->org_name = ftent->fts_path;
|
|
return(0);
|
|
}
|