progress.c

   1 /*      $NetBSD: progress.c,v 1.14 2007/02/07 15:21:21 hubertf Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by John Hawkinson.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of The NetBSD Foundation nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __RCSID("$NetBSD: progress.c,v 1.14 2007/02/07 15:21:21 hubertf Exp $");
  38 #endif                          /* not lint */
  39
  40 #include <sys/types.h>
  41 #include <sys/param.h>
  42 #include <sys/socket.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/time.h>
  45 #include <sys/wait.h>
  46 #include <netinet/in.h>
  47 #include <arpa/ftp.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <glob.h>
  53 #include <signal.h>
  54 #include <inttypes.h>
  55 #include <limits.h>
  56 #include <netdb.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <termios.h>
  61 #include <time.h>
  62 #include <tzfile.h>
  63 #include <unistd.h>
  64
  65 #define GLOBAL                  /* force GLOBAL decls in progressbar.h to be
  66                                  * declared */
  67 #include "progressbar.h"
  68
  69 static void usage(void);
  70 int main(int, char *[]);
  71
  72 static void
  73 usage(void)
  74 {
  75         fprintf(stderr,
  76             "usage: %s [-ez] [-f file] [-l length] [-p prefix] cmd [args...]\n",
  77             getprogname());
  78         exit(EXIT_FAILURE);
  79 }
  80
  81
  82 int
  83 main(int argc, char *argv[])
  84 {
  85         static char fb_buf[BUFSIZ];
  86         char *infile = NULL;
  87         pid_t pid = 0, gzippid = 0, deadpid;
  88         int ch, fd, outpipe[2];
  89         int ws, gzipstat, cmdstat;
  90         int eflag = 0, lflag = 0, zflag = 0;
  91         ssize_t nr, nw, off;
  92         struct stat statb;
  93         struct ttysize ts;
  94
  95         setprogname(argv[0]);
  96
  97         /* defaults: Read from stdin, 0 filesize (no completion estimate) */
  98         fd = STDIN_FILENO;
  99         filesize = 0;
 100         prefix = NULL;
 101
 102         while ((ch = getopt(argc, argv, "ef:l:p:z")) != -1)
 103                 switch (ch) {
 104                 case 'e':
 105                         eflag++;
 106                         break;
 107                 case 'f':
 108                         infile = optarg;
 109                         break;
 110                 case 'l':
 111                         lflag++;
 112                         filesize = strsuftoll("input size", optarg, 0,
 113                             LLONG_MAX);
 114                         break;
 115                 case 'p':
 116                         prefix = optarg;
 117                         break;
 118                 case 'z':
 119                         zflag++;
 120                         break;
 121                 case '?':
 122                 default:
 123                         usage();
 124                         /* NOTREACHED */
 125                 }
 126         argc -= optind;
 127         argv += optind;
 128
 129         if (argc < 1)
 130                 usage();
 131
 132         if (infile && (fd = open(infile, O_RDONLY, 0)) < 0)
 133                 err(1, "%s", infile);
 134
 135         /* stat() to get the filesize unless overridden, or -z */
 136         if (!zflag && !lflag && (fstat(fd, &statb) == 0)) {
 137                 if (S_ISFIFO(statb.st_mode)) {
 138                         /* stat(2) on pipe may return only the
 139                          * first few bytes with more coming.
 140                          * Don't trust!
 141                          */
 142                 } else {
 143                         filesize = statb.st_size;
 144                 }
 145         }
 146
 147         /* gzip -l the file if we have the name and -z is given */
 148         if (zflag && !lflag && infile != NULL) {
 149                 FILE *gzipsizepipe;
 150                 char buf[256], *cp, *cmd;
 151
 152                 /*
 153                  * Read second word of last line of gzip -l output. Looks like:
 154                  * % gzip -l ../etc.tgz
 155                  *   compressed uncompressed  ratio uncompressed_name
 156                  *       119737       696320  82.8% ../etc.tar
 157                  */
 158
 159                 asprintf(&cmd, "gzip -l %s", infile);
 160                 if ((gzipsizepipe = popen(cmd, "r")) == NULL)
 161                         err(1, "reading compressed file length");
 162                 for (; fgets(buf, 256, gzipsizepipe) != NULL;)
 163                     continue;
 164                 strtoimax(buf, &cp, 10);
 165                 filesize = strtoimax(cp, NULL, 10);
 166                 if (pclose(gzipsizepipe) < 0)
 167                         err(1, "closing compressed file length pipe");
 168                 free(cmd);
 169         }
 170         /* Pipe input through gzip -dc if -z is given */
 171         if (zflag) {
 172                 int gzippipe[2];
 173
 174                 if (pipe(gzippipe) < 0)
 175                         err(1, "gzip pipe");
 176                 gzippid = fork();
 177                 if (gzippid < 0)
 178                         err(1, "fork for gzip");
 179
 180                 if (gzippid) {
 181                         /* parent */
 182                         dup2(gzippipe[0], fd);
 183                         close(gzippipe[0]);
 184                         close(gzippipe[1]);
 185                 } else {
 186                         dup2(gzippipe[1], STDOUT_FILENO);
 187                         dup2(fd, STDIN_FILENO);
 188                         close(gzippipe[0]);
 189                         close(gzippipe[1]);
 190                         if (execlp("gzip", "gzip", "-dc", NULL))
 191                                 err(1, "exec()ing gzip");
 192                 }
 193         }
 194
 195         /* Initialize progressbar.c's global state */
 196         bytes = 0;
 197         progress = 1;
 198         ttyout = eflag ? stderr : stdout;
 199
 200         if (ioctl(fileno(ttyout), TIOCGSIZE, &ts) == -1)
 201                 ttywidth = 80;
 202         else
 203                 ttywidth = ts.ts_cols;
 204
 205         if (pipe(outpipe) < 0)
 206                 err(1, "output pipe");
 207         pid = fork();
 208         if (pid < 0)
 209                 err(1, "fork for output pipe");
 210
 211         if (pid == 0) {
 212                 /* child */
 213                 dup2(outpipe[0], STDIN_FILENO);
 214                 close(outpipe[0]);
 215                 close(outpipe[1]);
 216                 execvp(argv[0], argv);
 217                 err(1, "could not exec %s", argv[0]);
 218         }
 219         close(outpipe[0]);
 220
 221         progressmeter(-1);
 222         while ((nr = read(fd, fb_buf, BUFSIZ)) > 0)
 223                 for (off = 0; nr; nr -= nw, off += nw, bytes += nw)
 224                         if ((nw = write(outpipe[1], fb_buf + off,
 225                             (size_t) nr)) < 0)
 226                                 err(1, "writing %u bytes to output pipe",
 227                                                         (unsigned) nr);
 228         close(outpipe[1]);
 229
 230         gzipstat = 0;
 231         cmdstat = 0;
 232         while (pid || gzippid) {
 233                 deadpid = wait(&ws);
 234                 /*
 235                  * We need to exit with an error if the command (or gzip)
 236                  * exited abnormally.
 237                  * Unfortunately we can't generate a true 'exited by signal'
 238                  * error without sending the signal to ourselves :-(
 239                  */
 240                 ws = WIFSIGNALED(ws) ? WTERMSIG(ws) : WEXITSTATUS(ws);
 241
 242                 if (deadpid != -1 && errno == EINTR)
 243                         continue;
 244                 if (deadpid == pid) {
 245                         pid = 0;
 246                         cmdstat = ws;
 247                         continue;
 248                 }
 249                 if (deadpid == gzippid) {
 250                         gzippid = 0;
 251                         gzipstat = ws;
 252                         continue;
 253                 }
 254                 break;
 255         }
 256
 257         progressmeter(1);
 258         exit(cmdstat ? cmdstat : gzipstat);
 259 }