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