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    Contents of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/data_extract_all.c

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    Revision 816 - (show annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years ago) by niro
    File MIME type: text/plain
    File size: 4364 byte(s) 
    -updated to busybox-1.13.4
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    4 */
    5
    6 #include "libbb.h"
    7 #include "unarchive.h"
    8
    9 void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
    10 {
    11 file_header_t *file_header = archive_handle->file_header;
    12 int dst_fd;
    13 int res;
    14
    15 if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
    16 char *name = xstrdup(file_header->name);
    17 bb_make_directory(dirname(name), -1, FILEUTILS_RECUR);
    18 free(name);
    19 }
    20
    21 /* Check if the file already exists */
    22 if (archive_handle->ah_flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
    23 /* Remove the entry if it exists */
    24 if (((file_header->mode & S_IFMT) != S_IFDIR)
    25 && (unlink(file_header->name) == -1)
    26 && (errno != ENOENT)
    27 ) {
    28 bb_perror_msg_and_die("cannot remove old file %s",
    29 file_header->name);
    30 }
    31 }
    32 else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
    33 /* Remove the existing entry if its older than the extracted entry */
    34 struct stat statbuf;
    35 if (lstat(file_header->name, &statbuf) == -1) {
    36 if (errno != ENOENT) {
    37 bb_perror_msg_and_die("cannot stat old file");
    38 }
    39 }
    40 else if (statbuf.st_mtime <= file_header->mtime) {
    41 if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
    42 bb_error_msg("%s not created: newer or "
    43 "same age file exists", file_header->name);
    44 }
    45 data_skip(archive_handle);
    46 return;
    47 }
    48 else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
    49 bb_perror_msg_and_die("cannot remove old file %s",
    50 file_header->name);
    51 }
    52 }
    53
    54 /* Handle hard links separately
    55 * We identified hard links as regular files of size 0 with a symlink */
    56 if (S_ISREG(file_header->mode) && (file_header->link_target)
    57 && (file_header->size == 0)
    58 ) {
    59 /* hard link */
    60 res = link(file_header->link_target, file_header->name);
    61 if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
    62 bb_perror_msg("cannot create %slink "
    63 "from %s to %s", "hard",
    64 file_header->name,
    65 file_header->link_target);
    66 }
    67 } else {
    68 /* Create the filesystem entry */
    69 switch (file_header->mode & S_IFMT) {
    70 case S_IFREG: {
    71 /* Regular file */
    72 dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
    73 file_header->mode);
    74 bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
    75 close(dst_fd);
    76 break;
    77 }
    78 case S_IFDIR:
    79 res = mkdir(file_header->name, file_header->mode);
    80 if ((res == -1)
    81 && (errno != EISDIR) /* btw, Linux doesn't return this */
    82 && (errno != EEXIST)
    83 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    84 ) {
    85 bb_perror_msg("cannot make dir %s", file_header->name);
    86 }
    87 break;
    88 case S_IFLNK:
    89 /* Symlink */
    90 res = symlink(file_header->link_target, file_header->name);
    91 if ((res == -1)
    92 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    93 ) {
    94 bb_perror_msg("cannot create %slink "
    95 "from %s to %s", "sym",
    96 file_header->name,
    97 file_header->link_target);
    98 }
    99 break;
    100 case S_IFSOCK:
    101 case S_IFBLK:
    102 case S_IFCHR:
    103 case S_IFIFO:
    104 res = mknod(file_header->name, file_header->mode, file_header->device);
    105 if ((res == -1)
    106 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    107 ) {
    108 bb_perror_msg("cannot create node %s", file_header->name);
    109 }
    110 break;
    111 default:
    112 bb_error_msg_and_die("unrecognized file type");
    113 }
    114 }
    115
    116 if (!(archive_handle->ah_flags & ARCHIVE_NOPRESERVE_OWN)) {
    117 #if ENABLE_FEATURE_TAR_UNAME_GNAME
    118 uid_t uid = file_header->uid;
    119 gid_t gid = file_header->gid;
    120
    121 if (file_header->uname) {
    122 struct passwd *pwd = getpwnam(file_header->uname);
    123 if (pwd) uid = pwd->pw_uid;
    124 }
    125 if (file_header->gname) {
    126 struct group *grp = getgrnam(file_header->gname);
    127 if (grp) gid = grp->gr_gid;
    128 }
    129 lchown(file_header->name, uid, gid);
    130 #else
    131 lchown(file_header->name, file_header->uid, file_header->gid);
    132 #endif
    133 }
    134 if ((file_header->mode & S_IFMT) != S_IFLNK) {
    135 /* uclibc has no lchmod, glibc is even stranger -
    136 * it has lchmod which seems to do nothing!
    137 * so we use chmod... */
    138 if (!(archive_handle->ah_flags & ARCHIVE_NOPRESERVE_PERM)) {
    139 chmod(file_header->name, file_header->mode);
    140 }
    141 /* same for utime */
    142 if (archive_handle->ah_flags & ARCHIVE_PRESERVE_DATE) {
    143 struct utimbuf t;
    144 t.actime = t.modtime = file_header->mtime;
    145 utime(file_header->name, &t);
    146 }
    147 }
    148 }