vfs/cpio.c

   1 /* Virtual File System: GNU Tar file system.
   2    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007
   3    Free Software Foundation, Inc.
   4
   5    Written by: 2000 Jan Hudec
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License
   9    as published by the Free Software Foundation; either version 2 of
  10    the License, or (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include <config.h>
  22
  23 #include <errno.h>
  24
  25 #include <mhl/string.h>
  26
  27 #include "../src/global.h"
  28 #include "../src/tty.h"         /* enable/disable interrupt key */
  29 #include "../src/wtools.h"      /* message() */
  30 #include "../src/main.h"        /* print_vfs_message */
  31 #include "utilvfs.h"
  32 #include "vfs-impl.h"
  33 #include "gc.h"         /* vfs_rmstamp */
  34 #include "xdirentry.h"
  35 #include "../src/unixcompat.h"
  36
  37 enum {
  38     STATUS_START,
  39     STATUS_OK,
  40     STATUS_TRAIL,
  41     STATUS_FAIL,
  42     STATUS_EOF
  43 };
  44
  45 enum {
  46     CPIO_UNKNOWN = 0, /* Not determined yet */
  47     CPIO_BIN,         /* Binary format */
  48     CPIO_BINRE,       /* Binary format, reverse endianity */
  49     CPIO_OLDC,        /* Old ASCII format */
  50     CPIO_NEWC,        /* New ASCII format */
  51     CPIO_CRC          /* New ASCII format + CRC */
  52 };
  53
  54 static struct vfs_class vfs_cpiofs_ops;
  55
  56 struct old_cpio_header
  57 {
  58   unsigned short c_magic;
  59   short c_dev;
  60   unsigned short c_ino;
  61   unsigned short c_mode;
  62   unsigned short c_uid;
  63   unsigned short c_gid;
  64   unsigned short c_nlink;
  65   short c_rdev;
  66   unsigned short c_mtimes[2];
  67   unsigned short c_namesize;
  68   unsigned short c_filesizes[2];
  69 };
  70
  71 struct new_cpio_header
  72 {
  73   unsigned short c_magic;
  74   unsigned long c_ino;
  75   unsigned long c_mode;
  76   unsigned long c_uid;
  77   unsigned long c_gid;
  78   unsigned long c_nlink;
  79   unsigned long c_mtime;
  80   unsigned long c_filesize;
  81   long c_dev;
  82   long c_devmin;
  83   long c_rdev;
  84   long c_rdevmin;
  85   unsigned long c_namesize;
  86   unsigned long c_chksum;
  87 };
  88
  89 struct defer_inode {
  90     struct defer_inode *next;
  91     unsigned long inumber;
  92     unsigned short device;
  93     struct vfs_s_inode *inode;
  94 };
  95
  96 /* FIXME: should be off_t instead of int. */
  97 static int cpio_position;
  98
  99 static int cpio_find_head(struct vfs_class *me, struct vfs_s_super *super);
 100 static int cpio_create_entry(struct vfs_class *me, struct vfs_s_super *super, struct stat *, char *name);
 101 static ssize_t cpio_read_bin_head(struct vfs_class *me, struct vfs_s_super *super);
 102 static ssize_t cpio_read_oldc_head(struct vfs_class *me, struct vfs_s_super *super);
 103 static ssize_t cpio_read_crc_head(struct vfs_class *me, struct vfs_s_super *super);
 104 static ssize_t cpio_read(void *fh, char *buffer, int count);
 105
 106 #define CPIO_POS(super) cpio_position
 107 /* If some time reentrancy should be needed change it to */
 108 /* #define CPIO_POS(super) (super)->u.arch.fd */
 109
 110 #define CPIO_SEEK_SET(super, where) mc_lseek((super)->u.arch.fd, CPIO_POS(super) = (where), SEEK_SET)
 111 #define CPIO_SEEK_CUR(super, where) mc_lseek((super)->u.arch.fd, CPIO_POS(super) += (where), SEEK_SET)
 112
 113 static struct defer_inode *
 114 cpio_defer_find (struct defer_inode *l, struct defer_inode *i)
 115 {
 116     while (l && (l->inumber != i->inumber || l->device != i->device))
 117         l = l->next;
 118     return l;
 119 }
 120
 121 static int cpio_skip_padding(struct vfs_s_super *super)
 122 {
 123     switch(super->u.arch.type) {
 124     case CPIO_BIN:
 125     case CPIO_BINRE:
 126         return CPIO_SEEK_CUR(super, (2 - (CPIO_POS(super) % 2)) % 2);
 127     case CPIO_NEWC:
 128     case CPIO_CRC:
 129         return CPIO_SEEK_CUR(super, (4 - (CPIO_POS(super) % 4)) % 4);
 130     case CPIO_OLDC:
 131         return CPIO_POS(super);
 132     default:
 133         g_assert_not_reached();
 134         return 42; /* & the compiler is happy :-) */
 135     }
 136 }
 137
 138 static void cpio_free_archive(struct vfs_class *me, struct vfs_s_super *super)
 139 {
 140     struct defer_inode *l, *lnext;
 141
 142     (void) me;
 143
 144     if(super->u.arch.fd != -1)
 145         mc_close(super->u.arch.fd);
 146         super->u.arch.fd = -1;
 147     for (l = super->u.arch.deferred; l; l = lnext) {
 148         lnext = l->next;
 149         g_free (l);
 150     }
 151     super->u.arch.deferred = NULL;
 152 }
 153
 154 static int
 155 cpio_open_cpio_file (struct vfs_class *me, struct vfs_s_super *super,
 156                      const char *name)
 157 {
 158     int fd, type;
 159     mode_t mode;
 160     struct vfs_s_inode *root;
 161
 162     if ((fd = mc_open (name, O_RDONLY)) == -1) {
 163         message (D_ERROR, MSG_ERROR, _("Cannot open cpio archive\n%s"), name);
 164         return -1;
 165     }
 166
 167     super->name = mhl_str_dup (name);
 168     super->u.arch.fd = -1;      /* for now */
 169     mc_stat (name, &(super->u.arch.st));
 170     super->u.arch.type = CPIO_UNKNOWN;
 171
 172     type = get_compression_type (fd);
 173     if (type != COMPRESSION_NONE) {
 174         char *s;
 175
 176         mc_close (fd);
 177         s = g_strconcat (name, decompress_extension (type), (char *) NULL);
 178         if ((fd = mc_open (s, O_RDONLY)) == -1) {
 179             message (D_ERROR, MSG_ERROR, _("Cannot open cpio archive\n%s"), s);
 180             g_free (s);
 181             return -1;
 182         }
 183         g_free (s);
 184     }
 185
 186     super->u.arch.fd = fd;
 187     mode = super->u.arch.st.st_mode & 07777;
 188     mode |= (mode & 0444) >> 2; /* set eXec where Read is */
 189     mode |= S_IFDIR;
 190
 191     root = vfs_s_new_inode (me, super, &(super->u.arch.st));
 192     root->st.st_mode = mode;
 193     root->data_offset = -1;
 194     root->st.st_nlink++;
 195     root->st.st_dev = MEDATA->rdev++;
 196
 197     super->root = root;
 198
 199     CPIO_SEEK_SET (super, 0);
 200
 201     return fd;
 202 }
 203
 204 static ssize_t cpio_read_head(struct vfs_class *me, struct vfs_s_super *super)
 205 {
 206     switch(cpio_find_head(me, super)) {
 207     case CPIO_UNKNOWN:
 208         return -1;
 209     case CPIO_BIN:
 210     case CPIO_BINRE:
 211         return cpio_read_bin_head(me, super);
 212     case CPIO_OLDC:
 213         return cpio_read_oldc_head(me, super);
 214     case CPIO_NEWC:
 215     case CPIO_CRC:
 216         return cpio_read_crc_head(me, super);
 217     default:
 218         g_assert_not_reached();
 219         return 42; /* & the compiler is happy :-) */
 220     }
 221 }
 222
 223 #define MAGIC_LENGTH (6) /* How many bytes we have to read ahead */
 224 #define SEEKBACK CPIO_SEEK_CUR(super, ptr - top)
 225 #define RETURN(x) return(super->u.arch.type = (x))
 226 #define TYPEIS(x) ((super->u.arch.type == CPIO_UNKNOWN) || (super->u.arch.type == (x)))
 227 static int cpio_find_head(struct vfs_class *me, struct vfs_s_super *super)
 228 {
 229     char buf[256];
 230     int ptr = 0;
 231     int top;
 232     int tmp;
 233
 234     top = mc_read (super->u.arch.fd, buf, 256);
 235     if (top > 0)
 236         CPIO_POS (super) += top;
 237     for(;;) {
 238         if(ptr + MAGIC_LENGTH >= top) {
 239             if(top > 128) {
 240                 memmove(buf, buf + top - 128, 128);
 241                 ptr -= top - 128;
 242                 top = 128;
 243             }
 244             if((tmp = mc_read(super->u.arch.fd, buf, top)) == 0 || tmp == -1) {
 245                 message (D_ERROR, MSG_ERROR, _("Premature end of cpio archive\n%s"), super->name);
 246                 cpio_free_archive(me, super);
 247                 return CPIO_UNKNOWN;
 248             }
 249             top += tmp;
 250         }
 251         if(TYPEIS(CPIO_BIN) && ((*(unsigned short *)(buf + ptr)) == 070707)) {
 252             SEEKBACK; RETURN(CPIO_BIN);
 253         } else if(TYPEIS(CPIO_BINRE) && ((*(unsigned short *)(buf + ptr)) == GUINT16_SWAP_LE_BE_CONSTANT(070707))) {
 254             SEEKBACK; RETURN(CPIO_BINRE);
 255         } else if(TYPEIS(CPIO_OLDC) && (!strncmp(buf + ptr, "070707", 6))) {
 256             SEEKBACK; RETURN(CPIO_OLDC);
 257         } else if(TYPEIS(CPIO_NEWC) && (!strncmp(buf + ptr, "070701", 6))) {
 258             SEEKBACK; RETURN(CPIO_NEWC);
 259         } else if(TYPEIS(CPIO_CRC) && (!strncmp(buf + ptr, "070702", 6))) {
 260             SEEKBACK; RETURN(CPIO_CRC);
 261         };
 262         ptr++;
 263     }
 264 }
 265 #undef RETURN
 266 #undef SEEKBACK
 267
 268 #define HEAD_LENGTH (26)
 269 static ssize_t cpio_read_bin_head(struct vfs_class *me, struct vfs_s_super *super)
 270 {
 271     union {
 272         struct old_cpio_header buf;
 273         short shorts[HEAD_LENGTH >> 1];
 274     } u;
 275     int len;
 276     char *name;
 277     struct stat st;
 278
 279     if((len = mc_read(super->u.arch.fd, (char *)&u.buf, HEAD_LENGTH)) < HEAD_LENGTH)
 280         return STATUS_EOF;
 281     CPIO_POS(super) += len;
 282     if(super->u.arch.type == CPIO_BINRE) {
 283         int i;
 284         for(i = 0; i < (HEAD_LENGTH >> 1); i++)
 285             u.shorts[i] = GUINT16_SWAP_LE_BE_CONSTANT(u.shorts[i]);
 286     }
 287     g_assert(u.buf.c_magic == 070707);
 288
 289     if (u.buf.c_namesize == 0 || u.buf.c_namesize > MC_MAXPATHLEN) {
 290         message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"),
 291                 super->name);
 292         return STATUS_FAIL;
 293     }
 294     name = g_malloc(u.buf.c_namesize);
 295     if((len = mc_read(super->u.arch.fd, name, u.buf.c_namesize)) < u.buf.c_namesize) {
 296         g_free(name);
 297         return STATUS_EOF;
 298     }
 299     name[u.buf.c_namesize - 1] = '\0';
 300     CPIO_POS(super) += len;
 301     cpio_skip_padding(super);
 302
 303     if(!strcmp("TRAILER!!!", name)) { /* We got to the last record */
 304         g_free(name);
 305         return STATUS_TRAIL;
 306     }
 307
 308     st.st_dev = u.buf.c_dev;
 309     st.st_ino = u.buf.c_ino;
 310     st.st_mode = u.buf.c_mode;
 311     st.st_nlink = u.buf.c_nlink;
 312     st.st_uid = u.buf.c_uid;
 313     st.st_gid = u.buf.c_gid;
 314     st.st_rdev = u.buf.c_rdev;
 315     st.st_size = (u.buf.c_filesizes[0] << 16) | u.buf.c_filesizes[1];
 316     st.st_atime = st.st_mtime = st.st_ctime = (u.buf.c_mtimes[0] << 16) | u.buf.c_mtimes[1];
 317
 318     return cpio_create_entry(me, super, &st, name);
 319 }
 320 #undef HEAD_LENGTH
 321
 322 #define HEAD_LENGTH (76)
 323 static ssize_t cpio_read_oldc_head(struct vfs_class *me, struct vfs_s_super *super)
 324 {
 325     struct new_cpio_header hd;
 326     union {
 327         struct stat st;
 328         char buf[HEAD_LENGTH + 1];
 329     } u;
 330     int len;
 331     char *name;
 332
 333     if (mc_read (super->u.arch.fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH)
 334         return STATUS_EOF;
 335     CPIO_POS (super) += HEAD_LENGTH;
 336     u.buf[HEAD_LENGTH] = 0;
 337
 338     if (sscanf (u.buf, "070707%6lo%6lo%6lo%6lo%6lo%6lo%6lo%11lo%6lo%11lo",
 339               &hd.c_dev, &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid,
 340               &hd.c_nlink, &hd.c_rdev, &hd.c_mtime,
 341               &hd.c_namesize, &hd.c_filesize) < 10) {
 342         message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"),
 343                     super->name);
 344         return STATUS_FAIL;
 345     }
 346
 347     if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN) {
 348         message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"),
 349                     super->name);
 350         return STATUS_FAIL;
 351     }
 352     name = g_malloc(hd.c_namesize);
 353     if((len = mc_read(super->u.arch.fd, name, hd.c_namesize)) == -1 ||
 354        (unsigned long) len < hd.c_namesize) {
 355         g_free (name);
 356         return STATUS_EOF;
 357     }
 358     name[hd.c_namesize - 1] = '\0';
 359     CPIO_POS(super) +=  len;
 360     cpio_skip_padding(super);
 361
 362     if(!strcmp("TRAILER!!!", name)) { /* We got to the last record */
 363         g_free(name);
 364         return STATUS_TRAIL;
 365     }
 366
 367     u.st.st_dev = hd.c_dev;
 368     u.st.st_ino = hd.c_ino;
 369     u.st.st_mode = hd.c_mode;
 370     u.st.st_nlink = hd.c_nlink;
 371     u.st.st_uid = hd.c_uid;
 372     u.st.st_gid = hd.c_gid;
 373     u.st.st_rdev = hd.c_rdev;
 374     u.st.st_size = hd.c_filesize;
 375     u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
 376
 377     return cpio_create_entry (me, super, &u.st, name);
 378 }
 379 #undef HEAD_LENGTH
 380
 381 #define HEAD_LENGTH (110)
 382 static ssize_t cpio_read_crc_head(struct vfs_class *me, struct vfs_s_super *super)
 383 {
 384     struct new_cpio_header hd;
 385     union {
 386         struct stat st;
 387         char buf[HEAD_LENGTH + 1];
 388     } u;
 389     int len;
 390     char *name;
 391
 392     if (mc_read (super->u.arch.fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH)
 393         return STATUS_EOF;
 394     CPIO_POS (super) += HEAD_LENGTH;
 395     u.buf[HEAD_LENGTH] = 0;
 396
 397     if (sscanf (u.buf, "%6ho%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx",
 398               &hd.c_magic, &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid,
 399               &hd.c_nlink,  &hd.c_mtime, &hd.c_filesize,
 400               &hd.c_dev, &hd.c_devmin, &hd.c_rdev, &hd.c_rdevmin,
 401               &hd.c_namesize, &hd.c_chksum) < 14) {
 402         message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"),
 403                    super->name);
 404         return STATUS_FAIL;
 405     }
 406
 407     if((super->u.arch.type == CPIO_NEWC && hd.c_magic != 070701) ||
 408        (super->u.arch.type == CPIO_CRC && hd.c_magic != 070702))
 409         return STATUS_FAIL;
 410
 411     if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN) {
 412         message (D_ERROR, MSG_ERROR, _("Corrupted cpio header encountered in\n%s"),
 413                     super->name);
 414         return STATUS_FAIL;
 415     }
 416
 417     name = g_malloc(hd.c_namesize);
 418     if((len = mc_read (super->u.arch.fd, name, hd.c_namesize)) == -1 ||
 419        (unsigned long) len < hd.c_namesize) {
 420         g_free (name);
 421         return STATUS_EOF;
 422     }
 423     name[hd.c_namesize - 1] = '\0';
 424     CPIO_POS(super) += len;
 425     cpio_skip_padding(super);
 426
 427     if(!strcmp("TRAILER!!!", name)) { /* We got to the last record */
 428         g_free(name);
 429         return STATUS_TRAIL;
 430     }
 431
 432     u.st.st_dev = makedev (hd.c_dev, hd.c_devmin);
 433     u.st.st_ino = hd.c_ino;
 434     u.st.st_mode = hd.c_mode;
 435     u.st.st_nlink = hd.c_nlink;
 436     u.st.st_uid = hd.c_uid;
 437     u.st.st_gid = hd.c_gid;
 438     u.st.st_rdev = makedev (hd.c_rdev, hd.c_rdevmin);
 439     u.st.st_size = hd.c_filesize;
 440     u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
 441
 442     return cpio_create_entry (me, super, &u.st, name);
 443 }
 444
 445 static int
 446 cpio_create_entry (struct vfs_class *me, struct vfs_s_super *super,
 447                    struct stat *st, char *name)
 448 {
 449     struct vfs_s_inode *inode = NULL;
 450     struct vfs_s_inode *root = super->root;
 451     struct vfs_s_entry *entry = NULL;
 452     char *tn;
 453
 454     switch (st->st_mode & S_IFMT) {     /* For case of HP/UX archives */
 455     case S_IFCHR:
 456     case S_IFBLK:
 457 #ifdef S_IFSOCK
 458     case S_IFSOCK:
 459 #endif
 460 #ifdef S_IFIFO
 461     case S_IFIFO:
 462 #endif
 463 #ifdef S_IFNAM
 464     case S_IFNAM:
 465 #endif
 466         if ((st->st_size != 0) && (st->st_rdev == 0x0001)) {
 467             /* FIXME: representation of major/minor differs between */
 468             /* different operating systems. */
 469             st->st_rdev = (unsigned) st->st_size;
 470             st->st_size = 0;
 471         }
 472         break;
 473     default:
 474         break;
 475     }
 476
 477     if ((st->st_nlink > 1) && (super->u.arch.type == CPIO_NEWC || super->u.arch.type == CPIO_CRC)) {    /* For case of hardlinked files */
 478         struct defer_inode i, *l;
 479         i.inumber = st->st_ino;
 480         i.device = st->st_dev;
 481         i.inode = NULL;
 482         if ((l = cpio_defer_find (super->u.arch.deferred, &i)) != NULL) {
 483             inode = l->inode;
 484             if (inode->st.st_size && st->st_size
 485                 && (inode->st.st_size != st->st_size)) {
 486                 message (D_ERROR, MSG_ERROR,
 487                          _
 488                          ("Inconsistent hardlinks of\n%s\nin cpio archive\n%s"),
 489                          name, super->name);
 490                 inode = NULL;
 491             } else if (!inode->st.st_size)
 492                 inode->st.st_size = st->st_size;
 493         }
 494     }
 495
 496     for (tn = name + strlen (name) - 1; tn >= name && *tn == PATH_SEP; tn--)
 497         *tn = 0;
 498     if ((tn = strrchr (name, PATH_SEP))) {
 499         *tn = 0;
 500         root = vfs_s_find_inode (me, super, name, LINK_FOLLOW, FL_MKDIR);
 501         *tn = PATH_SEP;
 502         tn++;
 503     } else
 504         tn = name;
 505
 506     entry = MEDATA->find_entry (me, root, tn, LINK_FOLLOW, FL_NONE);    /* In case entry is already there */
 507
 508     if (entry) {                /* This shouldn't happen! (well, it can happen if there is a record for a
 509                                    file and than a record for a directory it is in; cpio would die with
 510                                    'No such file or directory' is such case) */
 511
 512         if (!S_ISDIR (entry->ino->st.st_mode)) {        /* This can be considered archive inconsistency */
 513             message (D_ERROR, MSG_ERROR,
 514                      _("%s contains duplicate entries! Skipping!"),
 515                      super->name);
 516         } else {
 517             entry->ino->st.st_mode = st->st_mode;
 518             entry->ino->st.st_uid = st->st_uid;
 519             entry->ino->st.st_gid = st->st_gid;
 520             entry->ino->st.st_atime = st->st_atime;
 521             entry->ino->st.st_mtime = st->st_mtime;
 522             entry->ino->st.st_ctime = st->st_ctime;
 523         }
 524
 525     } else {                    /* !entry */
 526
 527         if (!inode) {
 528             inode = vfs_s_new_inode (me, super, st);
 529             if ((st->st_nlink > 0) && (super->u.arch.type == CPIO_NEWC || super->u.arch.type == CPIO_CRC)) {    /* For case of hardlinked files */
 530                 struct defer_inode *i;
 531                 i = g_new (struct defer_inode, 1);
 532                 i->inumber = st->st_ino;
 533                 i->device = st->st_dev;
 534                 i->inode = inode;
 535                 i->next = super->u.arch.deferred;
 536                 super->u.arch.deferred = i;
 537             }
 538         }
 539
 540         if (st->st_size)
 541             inode->data_offset = CPIO_POS (super);
 542
 543         entry = vfs_s_new_entry (me, tn, inode);
 544         vfs_s_insert_entry (me, root, entry);
 545
 546         if (S_ISLNK (st->st_mode)) {
 547             inode->linkname = g_malloc (st->st_size + 1);
 548             if (mc_read (super->u.arch.fd, inode->linkname, st->st_size)
 549                 < st->st_size) {
 550                 inode->linkname[0] = 0;
 551                 g_free (name);
 552                 return STATUS_EOF;
 553             }
 554             inode->linkname[st->st_size] = 0;   /* Linkname stored without terminating \0 !!! */
 555             CPIO_POS (super) += st->st_size;
 556             cpio_skip_padding (super);
 557         } else {
 558             CPIO_SEEK_CUR (super, st->st_size);
 559         }
 560
 561     }                           /* !entry */
 562
 563     g_free (name);
 564     return STATUS_OK;
 565 }
 566
 567 /* Need to CPIO_SEEK_CUR to skip the file at the end of add entry!!!! */
 568
 569 static int
 570 cpio_open_archive (struct vfs_class *me, struct vfs_s_super *super,
 571                    const char *name, char *op)
 572 {
 573     int status = STATUS_START;
 574
 575     (void) op;
 576
 577     if (cpio_open_cpio_file (me, super, name) == -1)
 578         return -1;
 579
 580     for (;;) {
 581         status = cpio_read_head (me, super);
 582
 583         switch (status) {
 584         case STATUS_EOF:
 585             message (D_ERROR, MSG_ERROR, _("Unexpected end of file\n%s"), name);
 586             return 0;
 587         case STATUS_OK:
 588             continue;
 589         case STATUS_TRAIL:
 590             break;
 591         }
 592         break;
 593     }
 594
 595     return 0;
 596 }
 597
 598 /* Remaining functions are exactly same as for tarfs (and were in fact just copied) */
 599 static void *
 600 cpio_super_check (struct vfs_class *me, const char *archive_name, char *op)
 601 {
 602     static struct stat sb;
 603
 604     (void) me;
 605     (void) op;
 606
 607     if (mc_stat (archive_name, &sb))
 608         return NULL;
 609     return &sb;
 610 }
 611
 612 static int
 613 cpio_super_same (struct vfs_class *me, struct vfs_s_super *parc,
 614                  const char *archive_name, char *op, void *cookie)
 615 {
 616     struct stat *archive_stat = cookie; /* stat of main archive */
 617
 618     (void) me;
 619     (void) op;
 620
 621     if (strcmp (parc->name, archive_name))
 622         return 0;
 623
 624     /* Has the cached archive been changed on the disk? */
 625     if (parc->u.arch.st.st_mtime < archive_stat->st_mtime) {
 626         /* Yes, reload! */
 627         (*vfs_cpiofs_ops.free) ((vfsid) parc);
 628         vfs_rmstamp (&vfs_cpiofs_ops, (vfsid) parc);
 629         return 2;
 630     }
 631     /* Hasn't been modified, give it a new timeout */
 632     vfs_stamp (&vfs_cpiofs_ops, (vfsid) parc);
 633     return 1;
 634 }
 635
 636 static ssize_t cpio_read(void *fh, char *buffer, int count)
 637 {
 638     off_t begin = FH->ino->data_offset;
 639     int fd = FH_SUPER->u.arch.fd;
 640     struct vfs_class *me = FH_SUPER->me;
 641
 642     if (mc_lseek (fd, begin + FH->pos, SEEK_SET) !=
 643         begin + FH->pos) ERRNOR (EIO, -1);
 644
 645     count = MIN(count, FH->ino->st.st_size - FH->pos);
 646
 647     if ((count = mc_read (fd, buffer, count)) == -1) ERRNOR (errno, -1);
 648
 649     FH->pos += count;
 650     return count;
 651 }
 652
 653 static int cpio_fh_open(struct vfs_class *me, struct vfs_s_fh *fh, int flags, int mode)
 654 {
 655     (void) fh;
 656     (void) mode;
 657
 658     if ((flags & O_ACCMODE) != O_RDONLY) ERRNOR (EROFS, -1);
 659     return 0;
 660 }
 661
 662 void
 663 init_cpiofs (void)
 664 {
 665     static struct vfs_s_subclass cpio_subclass;
 666
 667     cpio_subclass.flags = VFS_S_READONLY;
 668     cpio_subclass.archive_check = cpio_super_check;
 669     cpio_subclass.archive_same = cpio_super_same;
 670     cpio_subclass.open_archive = cpio_open_archive;
 671     cpio_subclass.free_archive = cpio_free_archive;
 672     cpio_subclass.fh_open = cpio_fh_open;
 673
 674     vfs_s_init_class (&vfs_cpiofs_ops, &cpio_subclass);
 675     vfs_cpiofs_ops.name = "cpiofs";
 676     vfs_cpiofs_ops.prefix = "ucpio";
 677     vfs_cpiofs_ops.read = cpio_read;
 678     vfs_cpiofs_ops.setctl = NULL;
 679     vfs_register_class (&vfs_cpiofs_ops);
 680 }