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

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    Revision 816 - (hide 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 niro 532 /* 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 niro 816 void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
    10 niro 532 {
    11     file_header_t *file_header = archive_handle->file_header;
    12     int dst_fd;
    13     int res;
    14    
    15 niro 816 if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
    16 niro 532 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 niro 816 if (archive_handle->ah_flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
    23     /* Remove the entry if it exists */
    24 niro 532 if (((file_header->mode & S_IFMT) != S_IFDIR)
    25     && (unlink(file_header->name) == -1)
    26     && (errno != ENOENT)
    27     ) {
    28 niro 816 bb_perror_msg_and_die("cannot remove old file %s",
    29     file_header->name);
    30 niro 532 }
    31     }
    32 niro 816 else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
    33 niro 532 /* 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 niro 816 if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
    42 niro 532 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 niro 816 if (S_ISREG(file_header->mode) && (file_header->link_target)
    57 niro 532 && (file_header->size == 0)
    58     ) {
    59     /* hard link */
    60 niro 816 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 niro 532 }
    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 niro 816 if ((res == -1)
    81     && (errno != EISDIR) /* btw, Linux doesn't return this */
    82     && (errno != EEXIST)
    83     && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    84 niro 532 ) {
    85 niro 816 bb_perror_msg("cannot make dir %s", file_header->name);
    86 niro 532 }
    87     break;
    88     case S_IFLNK:
    89     /* Symlink */
    90 niro 816 res = symlink(file_header->link_target, file_header->name);
    91 niro 532 if ((res == -1)
    92 niro 816 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    93 niro 532 ) {
    94 niro 816 bb_perror_msg("cannot create %slink "
    95     "from %s to %s", "sym",
    96 niro 532 file_header->name,
    97 niro 816 file_header->link_target);
    98 niro 532 }
    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 niro 816 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
    107 niro 532 ) {
    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 niro 816 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 niro 532 lchown(file_header->name, file_header->uid, file_header->gid);
    132 niro 816 #endif
    133 niro 532 }
    134 niro 816 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 niro 532 }
    148     }