diff options
Diffstat (limited to 'archival/libarchive/data_extract_all.c')
| -rw-r--r-- | archival/libarchive/data_extract_all.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/archival/libarchive/data_extract_all.c b/archival/libarchive/data_extract_all.c new file mode 100644 index 000000000..1b25c8bd6 --- /dev/null +++ b/archival/libarchive/data_extract_all.c @@ -0,0 +1,200 @@ +/* vi: set sw=4 ts=4: */ +/* + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +#include "libbb.h" +#include "archive.h" + +void FAST_FUNC data_extract_all(archive_handle_t *archive_handle) +{ + file_header_t *file_header = archive_handle->file_header; + int dst_fd; + int res; + +#if ENABLE_FEATURE_TAR_SELINUX + char *sctx = archive_handle->tar__next_file_sctx; + if (!sctx) + sctx = archive_handle->tar__global_sctx; + if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */ + setfscreatecon(sctx); + free(archive_handle->tar__next_file_sctx); + archive_handle->tar__next_file_sctx = NULL; + } +#endif + + if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) { + char *slash = strrchr(file_header->name, '/'); + if (slash) { + *slash = '\0'; + bb_make_directory(file_header->name, -1, FILEUTILS_RECUR); + *slash = '/'; + } + } + + if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) { + /* Remove the entry if it exists */ + if (!S_ISDIR(file_header->mode)) { + /* Is it hardlink? + * We encode hard links as regular files of size 0 with a symlink */ + if (S_ISREG(file_header->mode) + && file_header->link_target + && file_header->size == 0 + ) { + /* Ugly special case: + * tar cf t.tar hardlink1 hardlink2 hardlink1 + * results in this tarball structure: + * hardlink1 + * hardlink2 -> hardlink1 + * hardlink1 -> hardlink1 <== !!! + */ + if (strcmp(file_header->link_target, file_header->name) == 0) + goto ret; + } + /* Proceed with deleting */ + if (unlink(file_header->name) == -1 + && errno != ENOENT + ) { + bb_perror_msg_and_die("can't remove old file %s", + file_header->name); + } + } + } + else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) { + /* Remove the existing entry if its older than the extracted entry */ + struct stat existing_sb; + if (lstat(file_header->name, &existing_sb) == -1) { + if (errno != ENOENT) { + bb_perror_msg_and_die("can't stat old file"); + } + } + else if (existing_sb.st_mtime >= file_header->mtime) { + if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) + && !S_ISDIR(file_header->mode) + ) { + bb_error_msg("%s not created: newer or " + "same age file exists", file_header->name); + } + data_skip(archive_handle); + goto ret; + } + else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) { + bb_perror_msg_and_die("can't remove old file %s", + file_header->name); + } + } + + /* Handle hard links separately + * We encode hard links as regular files of size 0 with a symlink */ + if (S_ISREG(file_header->mode) + && file_header->link_target + && file_header->size == 0 + ) { + /* hard link */ + res = link(file_header->link_target, file_header->name); + if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) { + bb_perror_msg("can't create %slink " + "from %s to %s", "hard", + file_header->name, + file_header->link_target); + } + /* Hardlinks have no separate mode/ownership, skip chown/chmod */ + goto ret; + } + + /* Create the filesystem entry */ + switch (file_header->mode & S_IFMT) { + case S_IFREG: { + /* Regular file */ + int flags = O_WRONLY | O_CREAT | O_EXCL; + if (archive_handle->ah_flags & ARCHIVE_O_TRUNC) + flags = O_WRONLY | O_CREAT | O_TRUNC; + dst_fd = xopen3(file_header->name, + flags, + file_header->mode + ); + bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size); + close(dst_fd); + break; + } + case S_IFDIR: + res = mkdir(file_header->name, file_header->mode); + if ((res == -1) + && (errno != EISDIR) /* btw, Linux doesn't return this */ + && (errno != EEXIST) + && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) + ) { + bb_perror_msg("can't make dir %s", file_header->name); + } + break; + case S_IFLNK: + /* Symlink */ +//TODO: what if file_header->link_target == NULL (say, corrupted tarball?) + res = symlink(file_header->link_target, file_header->name); + if ((res == -1) + && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) + ) { + bb_perror_msg("can't create %slink " + "from %s to %s", "sym", + file_header->name, + file_header->link_target); + } + break; + case S_IFSOCK: + case S_IFBLK: + case S_IFCHR: + case S_IFIFO: + res = mknod(file_header->name, file_header->mode, file_header->device); + if ((res == -1) + && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) + ) { + bb_perror_msg("can't create node %s", file_header->name); + } + break; + default: + bb_error_msg_and_die("unrecognized file type"); + } + + if (!S_ISLNK(file_header->mode)) { + if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) { + uid_t uid = file_header->uid; + gid_t gid = file_header->gid; +#if ENABLE_FEATURE_TAR_UNAME_GNAME + if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) { + if (file_header->tar__uname) { +//TODO: cache last name/id pair? + struct passwd *pwd = getpwnam(file_header->tar__uname); + if (pwd) uid = pwd->pw_uid; + } + if (file_header->tar__gname) { + struct group *grp = getgrnam(file_header->tar__gname); + if (grp) gid = grp->gr_gid; + } + } +#endif + /* GNU tar 1.15.1 uses chown, not lchown */ + chown(file_header->name, uid, gid); + } + /* uclibc has no lchmod, glibc is even stranger - + * it has lchmod which seems to do nothing! + * so we use chmod... */ + if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) { + chmod(file_header->name, file_header->mode); + } + if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) { + struct timeval t[2]; + + t[1].tv_sec = t[0].tv_sec = file_header->mtime; + t[1].tv_usec = t[0].tv_usec = 0; + utimes(file_header->name, t); + } + } + + ret: ; +#if ENABLE_FEATURE_TAR_SELINUX + if (sctx) { + /* reset the context after creating an entry */ + setfscreatecon(NULL); + } +#endif +} |