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tls.c

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/* -*- c-file-style: "linux" -*-
 *
 * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 * 
 * 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.
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/**
 * @file tls.c
 *
 * Trivial @c ls for comparing two directories after running an rsync.
 *
 * The problem with using the system's own ls is that some features
 * have little quirks that make directories look different when for
 * our purposes they're the same -- for example, the BSD braindamage
 * about setting the mode on symlinks based on your current umask.
 *
 * All the filenames must be given on the command line -- tls does not
 * even read directories, let alone recurse.  The typical usage is
 * "find|sort|xargs tls".
 *
 * The format is not exactly the same as any particular Unix ls(1).
 *
 * A key requirement for this program is that the output be "very
 * reproducible."  So we mask away information that can accidentally
 * change.
 **/


#include "rsync.h"

#define PROGRAM "tls"

/* These are to make syscall.o shut up. */
int dry_run = 0;
int read_only = 1;
int list_only = 0;


static void failed (char const *what,
                    char const *where)
{
        fprintf (stderr, PROGRAM ": %s %s: %s\n",
                 what, where, strerror (errno));
        exit (1);
}



static void list_file (const char *fname)
{
        STRUCT_STAT buf;
        char permbuf[PERMSTRING_SIZE];
        struct tm *mt;
        char datebuf[50];
        char linkbuf[4096];

        if (do_lstat(fname, &buf) == -1)
                failed ("stat", fname);

        /* The size of anything but a regular file is probably not
         * worth thinking about. */
        if (!S_ISREG(buf.st_mode))
                buf.st_size = 0;

        /* On some BSD platforms the mode bits of a symlink are
         * undefined.  Also it tends not to be possible to reset a
         * symlink's mtime, so we have to ignore it too. */
        if (S_ISLNK(buf.st_mode)) {
                int len;
                buf.st_mode &= ~0777;
                buf.st_mtime = (time_t)0;
                buf.st_uid = buf.st_gid = 0;
                strcpy(linkbuf, " -> ");
                /* const-cast required for silly UNICOS headers */
                len = readlink((char *) fname, linkbuf+4, sizeof(linkbuf) - 4);
                if (len == -1) 
                        failed("readlink", fname);
                else
                        /* it's not nul-terminated */
                        linkbuf[4+len] = 0;
        } else {
                linkbuf[0] = 0;
        }

        permstring(permbuf, buf.st_mode);

        if (buf.st_mtime) {
                mt = gmtime(&buf.st_mtime);
                
                sprintf(datebuf, "%04d-%02d-%02d %02d:%02d:%02d",
                        mt->tm_year + 1900,
                        mt->tm_mon + 1,
                        mt->tm_mday,
                        mt->tm_hour,
                        mt->tm_min,
                        mt->tm_sec);
        } else {
                strcpy(datebuf, "                   ");
        }
        
        /* TODO: Perhaps escape special characters in fname? */
        
        
        /* NB: need to pass size as a double because it might be be
         * too large for a long. */
        printf("%s %12.0f %6ld.%-6ld %6d %s %s%s\n",
               permbuf, (double) buf.st_size,
               (long) buf.st_uid, (long) buf.st_gid,
               buf.st_nlink,
               datebuf, fname, linkbuf);
}


int main (int argc, char *argv[])
{
        if (argc < 2) {
                fprintf (stderr, "usage: " PROGRAM " DIR ...\n"
                         "Trivial file listing program for portably checking rsync\n");
                return 1;
        }

        for (argv++; *argv; argv++) {
                list_file (*argv);
        }

        return 0;
}

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