mdw@git.distorted.org.uk Git - dpkg/blob - dpkg-deb/info.c

   1 /*
   2  * dpkg-deb - construction and deconstruction of *.deb archives
   3  * info.c - providing information
   4  *
   5  * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  * Copyright © 2001 Wichert Akkerman
   7  * Copyright © 2007-2015 Guillem Jover <guillem@debian.org>
   8  *
   9  * This is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <config.h>
  24 #include <compat.h>
  25
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <sys/wait.h>
  29
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include <string.h>
  33 #include <fcntl.h>
  34 #include <dirent.h>
  35 #include <unistd.h>
  36 #include <stdint.h>
  37 #include <stdlib.h>
  38 #include <stdio.h>
  39
  40 #include <dpkg/i18n.h>
  41 #include <dpkg/c-ctype.h>
  42 #include <dpkg/dpkg.h>
  43 #include <dpkg/dpkg-db.h>
  44 #include <dpkg/parsedump.h>
  45 #include <dpkg/pkg-format.h>
  46 #include <dpkg/buffer.h>
  47 #include <dpkg/path.h>
  48 #include <dpkg/options.h>
  49
  50 #include "dpkg-deb.h"
  51
  52 static void cu_info_prepare(int argc, void **argv) {
  53   char *dir;
  54
  55   dir = argv[0];
  56   path_remove_tree(dir);
  57   free(dir);
  58 }
  59
  60 static void info_prepare(const char *const **argvp,
  61                          const char **debarp,
  62                          const char **dirp,
  63                          int admininfo) {
  64   char *dbuf;
  65
  66   *debarp= *(*argvp)++;
  67   if (!*debarp) badusage(_("--%s needs a .deb filename argument"),cipaction->olong);
  68
  69   dbuf = mkdtemp(path_make_temp_template("dpkg-deb"));
  70   if (!dbuf)
  71     ohshite(_("unable to create temporary directory"));
  72   *dirp = dbuf;
  73
  74   push_cleanup(cu_info_prepare, -1, NULL, 0, 1, (void *)dbuf);
  75   extracthalf(*debarp, dbuf, DPKG_TAR_EXTRACT | DPKG_TAR_NOMTIME, admininfo);
  76 }
  77
  78 static int ilist_select(const struct dirent *de) {
  79   return strcmp(de->d_name,".") && strcmp(de->d_name,"..");
  80 }
  81
  82 static void
  83 info_spew(const char *debar, const char *dir, const char *const *argv)
  84 {
  85   struct dpkg_error err;
  86   const char *component;
  87   struct varbuf controlfile = VARBUF_INIT;
  88   int fd;
  89   int re= 0;
  90
  91   while ((component = *argv++) != NULL) {
  92     varbuf_reset(&controlfile);
  93     varbuf_printf(&controlfile, "%s/%s", dir, component);
  94
  95     fd = open(controlfile.buf, O_RDONLY);
  96     if (fd >= 0) {
  97       if (fd_fd_copy(fd, 1, -1, &err) < 0)
  98         ohshit(_("cannot extract control file '%s' from '%s': %s"),
  99                controlfile.buf, debar, err.str);
 100       close(fd);
 101     } else if (errno == ENOENT) {
 102       notice(_("'%.255s' contains no control component '%.255s'"),
 103              debar, component);
 104       re++;
 105     } else {
 106       ohshite(_("open component '%.255s' (in %.255s) failed in an unexpected way"),
 107               component, dir);
 108     }
 109   }
 110   varbuf_destroy(&controlfile);
 111
 112   if (re > 0)
 113     ohshit(P_("%d requested control component is missing",
 114               "%d requested control components are missing", re), re);
 115 }
 116
 117 static void
 118 info_list(const char *debar, const char *dir)
 119 {
 120   char interpreter[INTERPRETER_MAX+1], *p;
 121   int il, lines;
 122   struct varbuf controlfile = VARBUF_INIT;
 123   struct dirent **cdlist, *cdep;
 124   int cdn, n;
 125   FILE *cc;
 126   struct stat stab;
 127   int c;
 128
 129   cdn = scandir(dir, &cdlist, &ilist_select, alphasort);
 130   if (cdn == -1)
 131     ohshite(_("cannot scan directory '%.255s'"), dir);
 132
 133   for (n = 0; n < cdn; n++) {
 134     cdep = cdlist[n];
 135
 136     varbuf_reset(&controlfile);
 137     varbuf_printf(&controlfile, "%s/%s", dir, cdep->d_name);
 138
 139     if (stat(controlfile.buf, &stab))
 140       ohshite(_("cannot stat '%.255s' (in '%.255s')"), cdep->d_name, dir);
 141     if (S_ISREG(stab.st_mode)) {
 142       cc = fopen(controlfile.buf, "r");
 143       if (!cc)
 144         ohshite(_("cannot open '%.255s' (in '%.255s')"), cdep->d_name, dir);
 145       lines = 0;
 146       interpreter[0] = '\0';
 147       if (getc(cc) == '#') {
 148         if (getc(cc) == '!') {
 149           while ((c= getc(cc))== ' ');
 150           p=interpreter; *p++='#'; *p++='!'; il=2;
 151           while (il < INTERPRETER_MAX && !c_isspace(c) && c != EOF) {
 152             *p++= c; il++; c= getc(cc);
 153           }
 154           *p = '\0';
 155           if (c=='\n') lines++;
 156         }
 157       }
 158       while ((c= getc(cc))!= EOF) { if (c == '\n') lines++; }
 159       if (ferror(cc))
 160         ohshite(_("failed to read '%.255s' (in '%.255s')"), cdep->d_name, dir);
 161       fclose(cc);
 162       printf(_(" %7jd bytes, %5d lines   %c  %-20.127s %.127s\n"),
 163              (intmax_t)stab.st_size, lines, S_IXUSR & stab.st_mode ? '*' : ' ',
 164              cdep->d_name, interpreter);
 165     } else {
 166       printf(_("     not a plain file          %.255s\n"), cdep->d_name);
 167     }
 168     free(cdep);
 169   }
 170   free(cdlist);
 171
 172   varbuf_reset(&controlfile);
 173   varbuf_printf(&controlfile, "%s/%s", dir, CONTROLFILE);
 174   cc = fopen(controlfile.buf, "r");
 175   if (!cc) {
 176     if (errno != ENOENT)
 177       ohshite(_("failed to read '%.255s' (in '%.255s')"), CONTROLFILE, dir);
 178     warning(_("no 'control' file in control archive!"));
 179   } else {
 180     lines= 1;
 181     while ((c= getc(cc))!= EOF) {
 182       if (lines)
 183         putc(' ', stdout);
 184       putc(c, stdout);
 185       lines= c=='\n';
 186     }
 187     if (!lines)
 188       putc('\n', stdout);
 189
 190     if (ferror(cc))
 191       ohshite(_("failed to read '%.255s' (in '%.255s')"), CONTROLFILE, dir);
 192     fclose(cc);
 193   }
 194
 195   m_output(stdout, _("<standard output>"));
 196   varbuf_destroy(&controlfile);
 197 }
 198
 199 static void
 200 info_field(const char *debar, const char *dir, const char *const *fields,
 201            enum fwriteflags fieldflags)
 202 {
 203   char *controlfile;
 204   struct varbuf str = VARBUF_INIT;
 205   struct pkginfo *pkg;
 206   int i;
 207
 208   controlfile = str_fmt("%s/%s", dir, CONTROLFILE);
 209   parsedb(controlfile, pdb_parse_binary | pdb_ignorefiles, &pkg);
 210   free(controlfile);
 211
 212   for (i = 0; fields[i]; i++) {
 213     const struct fieldinfo *field;
 214     const struct arbitraryfield *arbfield;
 215
 216     varbuf_reset(&str);
 217     field = find_field_info(fieldinfos, fields[i]);
 218     if (field) {
 219       field->wcall(&str, pkg, &pkg->available, fieldflags, field);
 220     } else {
 221       arbfield = find_arbfield_info(pkg->available.arbs, fields[i]);
 222       if (arbfield)
 223         varbuf_add_arbfield(&str, arbfield, fieldflags);
 224     }
 225     varbuf_end_str(&str);
 226
 227     if (fieldflags & fw_printheader)
 228       printf("%s", str.buf);
 229     else
 230       printf("%s\n", str.buf);
 231   }
 232
 233   m_output(stdout, _("<standard output>"));
 234
 235   varbuf_destroy(&str);
 236 }
 237
 238 int
 239 do_showinfo(const char *const *argv)
 240 {
 241   const char *debar, *dir;
 242   char *controlfile;
 243   struct dpkg_error err;
 244   struct pkginfo *pkg;
 245   struct pkg_format_node *fmt;
 246
 247   fmt = pkg_format_parse(showformat, &err);
 248   if (!fmt)
 249     ohshit(_("error in show format: %s"), err.str);
 250
 251   info_prepare(&argv, &debar, &dir, 1);
 252
 253   controlfile  = str_fmt("%s/%s", dir, CONTROLFILE);
 254   parsedb(controlfile, pdb_parse_binary | pdb_ignorefiles, &pkg);
 255   pkg_format_show(fmt, pkg, &pkg->available);
 256   pkg_format_free(fmt);
 257   free(controlfile);
 258
 259   return 0;
 260 }
 261
 262 int
 263 do_info(const char *const *argv)
 264 {
 265   const char *debar, *dir;
 266
 267   if (*argv && argv[1]) {
 268     info_prepare(&argv, &debar, &dir, 1);
 269     info_spew(debar, dir, argv);
 270   } else {
 271     info_prepare(&argv, &debar, &dir, 2);
 272     info_list(debar, dir);
 273   }
 274
 275   return 0;
 276 }
 277
 278 int
 279 do_field(const char *const *argv)
 280 {
 281   const char *debar, *dir;
 282
 283   info_prepare(&argv, &debar, &dir, 1);
 284   if (*argv) {
 285     info_field(debar, dir, argv, argv[1] != NULL ? fw_printheader : 0);
 286   } else {
 287     static const char *const controlonly[] = { CONTROLFILE, NULL };
 288     info_spew(debar, dir, controlonly);
 289   }
 290
 291   return 0;
 292 }
 293
 294 int
 295 do_contents(const char *const *argv)
 296 {
 297   const char *debar = *argv++;
 298
 299   if (debar == NULL || *argv)
 300     badusage(_("--%s takes exactly one argument"), cipaction->olong);
 301   extracthalf(debar, NULL, DPKG_TAR_LIST, 0);
 302
 303   return 0;
 304 }