/* Extract files from a tar archive. Copyright 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. Written by John Gilmore, on 1985-11-19. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* $FreeBSD: src/contrib/tar/src/extract.c,v 1.4.2.3 2002/10/19 09:37:29 sobomax Exp $ */ /* $DragonFly: src/contrib/tar/src/Attic/extract.c,v 1.2 2003/06/17 04:24:06 dillon Exp $ */ #include "system.h" #include #if HAVE_UTIME_H # include #else struct utimbuf { long actime; long modtime; }; #endif #include "common.h" int we_are_root; /* true if our effective uid == 0 */ static mode_t newdir_umask; /* umask when creating new directories */ static mode_t current_umask; /* current umask (which is set to 0 if -p) */ /* Status of the permissions of a file that we are extracting. */ enum permstatus { /* This file may have existed already; its permissions are unknown. */ UNKNOWN_PERMSTATUS, /* This file was created using the permissions from the archive. */ ARCHIVED_PERMSTATUS, /* This is an intermediate directory; the archive did not specify its permissions. */ INTERDIR_PERMSTATUS }; /* List of directories whose statuses we need to extract after we've finished extracting their subsidiary files. If you consider each contiguous subsequence of elements of the form [D]?[^D]*, where [D] represents an element where AFTER_SYMLINKS is nonzero and [^D] represents an element where AFTER_SYMLINKS is zero, then the head of the subsequence has the longest name, and each non-head element in the prefix is an ancestor (in the directory hierarchy) of the preceding element. */ struct delayed_set_stat { struct delayed_set_stat *next; struct stat stat_info; size_t file_name_len; mode_t invert_permissions; enum permstatus permstatus; bool after_symlinks; char file_name[1]; }; static struct delayed_set_stat *delayed_set_stat_head; /* List of symbolic links whose creation we have delayed. */ struct delayed_symlink { /* The next delayed symbolic link in the list. */ struct delayed_symlink *next; /* The device, inode number and last-modified time of the placeholder. */ dev_t dev; ino_t ino; time_t mtime; /* The desired owner and group of the symbolic link. */ uid_t uid; gid_t gid; /* A list of sources for this symlink. The sources are all to be hard-linked together. */ struct string_list *sources; /* The desired target of the desired link. */ char target[1]; }; static struct delayed_symlink *delayed_symlink_head; struct string_list { struct string_list *next; char string[1]; }; /* Set up to extract files. */ void extr_init (void) { we_are_root = geteuid () == 0; #ifndef __FreeBSD__ same_permissions_option += we_are_root; #endif same_owner_option += we_are_root; xalloc_fail_func = extract_finish; /* Option -p clears the kernel umask, so it does not affect proper restoration of file permissions. New intermediate directories will comply with umask at start of program. */ newdir_umask = umask (0); if (0 < same_permissions_option) current_umask = 0; else { umask (newdir_umask); /* restore the kernel umask */ current_umask = newdir_umask; #ifdef __FreeBSD__ same_permissions_option++; #endif } } /* If restoring permissions, restore the mode for FILE_NAME from information given in *STAT_INFO (where *CURRENT_STAT_INFO gives the current status if CURRENT_STAT_INFO is nonzero); otherwise invert the INVERT_PERMISSIONS bits from the file's current permissions. PERMSTATUS specifies the status of the file's permissions. TYPEFLAG specifies the type of the file. */ static void set_mode (char const *file_name, struct stat const *stat_info, struct stat const *current_stat_info, mode_t invert_permissions, enum permstatus permstatus, char typeflag) { mode_t mode; if (0 < same_permissions_option && permstatus != INTERDIR_PERMSTATUS) { mode = stat_info->st_mode; /* If we created the file and it has a usual mode, then its mode is normally set correctly already. But on many hosts, some directories inherit the setgid bits from their parents, so we we must set directories' modes explicitly. */ if (permstatus == ARCHIVED_PERMSTATUS && ! (mode & ~ MODE_RWX) && typeflag != DIRTYPE && typeflag != GNUTYPE_DUMPDIR) return; } else if (! invert_permissions) return; else { /* We must inspect a directory's current permissions, since the directory may have inherited its setgid bit from its parent. INVERT_PERMISSIONS happens to be nonzero only for directories that we created, so there's no point optimizing this code for other cases. */ struct stat st; if (! current_stat_info) { if (stat (file_name, &st) != 0) { stat_error (file_name); return; } current_stat_info = &st; } mode = current_stat_info->st_mode ^ invert_permissions; } if (chmod (file_name, mode & ~ current_umask) != 0) chmod_error_details (file_name, mode); } /* Check time after successfully setting FILE_NAME's time stamp to T. */ static void check_time (char const *file_name, time_t t) { time_t now; if (start_time < t && (now = time (0)) < t) WARN ((0, 0, _("%s: time stamp %s is %lu s in the future"), file_name, tartime (t), (unsigned long) (t - now))); } /* Restore stat attributes (owner, group, mode and times) for FILE_NAME, using information given in *STAT_INFO. If CURRENT_STAT_INFO is nonzero, *CURRENT_STAT_INFO is the file's currernt status. If not restoring permissions, invert the INVERT_PERMISSIONS bits from the file's current permissions. PERMSTATUS specifies the status of the file's permissions. TYPEFLAG specifies the type of the file. */ /* FIXME: About proper restoration of symbolic link attributes, we still do not have it right. Pretesters' reports tell us we need further study and probably more configuration. For now, just use lchown if it exists, and punt for the rest. Sigh! */ static void set_stat (char const *file_name, struct stat const *stat_info, struct stat const *current_stat_info, mode_t invert_permissions, enum permstatus permstatus, char typeflag) { struct utimbuf utimbuf; if (typeflag != SYMTYPE) { /* We do the utime before the chmod because some versions of utime are broken and trash the modes of the file. */ if (! touch_option && permstatus != INTERDIR_PERMSTATUS) { /* We set the accessed time to `now', which is really the time we started extracting files, unless incremental_option is used, in which case .st_atime is used. */ /* FIXME: incremental_option should set ctime too, but how? */ if (incremental_option) utimbuf.actime = stat_info->st_atime; else utimbuf.actime = start_time; utimbuf.modtime = stat_info->st_mtime; if (utime (file_name, &utimbuf) < 0) utime_error (file_name); else { check_time (file_name, stat_info->st_atime); check_time (file_name, stat_info->st_mtime); } } /* Some systems allow non-root users to give files away. Once this done, it is not possible anymore to change file permissions, so we have to set permissions prior to possibly giving files away. */ set_mode (file_name, stat_info, current_stat_info, invert_permissions, permstatus, typeflag); } if (0 < same_owner_option && permstatus != INTERDIR_PERMSTATUS) { /* When lchown exists, it should be used to change the attributes of the symbolic link itself. In this case, a mere chown would change the attributes of the file the symbolic link is pointing to, and should be avoided. */ if (typeflag == SYMTYPE) { #if HAVE_LCHOWN if (lchown (file_name, stat_info->st_uid, stat_info->st_gid) < 0) chown_error_details (file_name, stat_info->st_uid, stat_info->st_gid); #endif } else { if (chown (file_name, stat_info->st_uid, stat_info->st_gid) < 0) chown_error_details (file_name, stat_info->st_uid, stat_info->st_gid); /* On a few systems, and in particular, those allowing to give files away, changing the owner or group destroys the suid or sgid bits. So let's attempt setting these bits once more. */ if (stat_info->st_mode & (S_ISUID | S_ISGID | S_ISVTX)) set_mode (file_name, stat_info, 0, invert_permissions, permstatus, typeflag); } } } /* Remember to restore stat attributes (owner, group, mode and times) for the directory FILE_NAME, using information given in *STAT_INFO, once we stop extracting files into that directory. If not restoring permissions, remember to invert the INVERT_PERMISSIONS bits from the file's current permissions. PERMSTATUS specifies the status of the file's permissions. */ static void delay_set_stat (char const *file_name, struct stat const *stat_info, mode_t invert_permissions, enum permstatus permstatus) { size_t file_name_len = strlen (file_name); struct delayed_set_stat *data = xmalloc (offsetof (struct delayed_set_stat, file_name) + file_name_len + 1); data->file_name_len = file_name_len; strcpy (data->file_name, file_name); data->invert_permissions = invert_permissions; data->permstatus = permstatus; data->after_symlinks = 0; data->stat_info = *stat_info; data->next = delayed_set_stat_head; delayed_set_stat_head = data; } /* Update the delayed_set_stat info for an intermediate directory created on the path to DIR_NAME. The intermediate directory turned out to be the same as this directory, e.g. due to ".." or symbolic links. *DIR_STAT_INFO is the status of the directory. */ static void repair_delayed_set_stat (char const *dir_name, struct stat const *dir_stat_info) { struct delayed_set_stat *data; for (data = delayed_set_stat_head; data; data = data->next) { struct stat st; if (stat (data->file_name, &st) != 0) { stat_error (data->file_name); return; } if (st.st_dev == dir_stat_info->st_dev && st.st_ino == dir_stat_info->st_ino) { data->stat_info = current_stat; data->invert_permissions = (MODE_RWX & (current_stat.st_mode ^ st.st_mode)); data->permstatus = ARCHIVED_PERMSTATUS; return; } } ERROR ((0, 0, _("%s: Unexpected inconsistency when making directory"), quotearg_colon (dir_name))); } /* After a file/link/symlink/directory creation has failed, see if it's because some required directory was not present, and if so, create all required directories. Return non-zero if a directory was created. */ static int make_directories (char *file_name) { char *cursor0 = file_name + FILESYSTEM_PREFIX_LEN (file_name); char *cursor; /* points into path */ int did_something = 0; /* did we do anything yet? */ int mode; int invert_permissions; int status; for (cursor = cursor0; *cursor; cursor++) { if (! ISSLASH (*cursor)) continue; /* Avoid mkdir of empty string, if leading or double '/'. */ if (cursor == cursor0 || ISSLASH (cursor[-1])) continue; /* Avoid mkdir where last part of path is "." or "..". */ if (cursor[-1] == '.' && (cursor == cursor0 + 1 || ISSLASH (cursor[-2]) || (cursor[-2] == '.' && (cursor == cursor0 + 2 || ISSLASH (cursor[-3]))))) continue; *cursor = '\0'; /* truncate the path there */ mode = MODE_RWX & ~ newdir_umask; invert_permissions = we_are_root ? 0 : MODE_WXUSR & ~ mode; status = mkdir (file_name, mode ^ invert_permissions); if (status == 0) { /* Create a struct delayed_set_stat even if invert_permissions is zero, because repair_delayed_set_stat may need to update the struct. */ delay_set_stat (file_name, ¤t_stat /* ignored */, invert_permissions, INTERDIR_PERMSTATUS); print_for_mkdir (file_name, cursor - file_name, mode); did_something = 1; *cursor = '/'; continue; } *cursor = '/'; if (errno == EEXIST #if MSDOS /* Turbo C mkdir gives a funny errno. */ || errno == EACCES #endif ) /* Directory already exists. */ continue; /* Some other error in the mkdir. We return to the caller. */ break; } return did_something; /* tell them to retry if we made one */ } /* Prepare to extract a file. Return zero if extraction should not proceed. */ static int prepare_to_extract (char const *file_name) { if (to_stdout_option) return 0; if (old_files_option == UNLINK_FIRST_OLD_FILES && !remove_any_file (file_name, recursive_unlink_option) && errno && errno != ENOENT) { unlink_error (file_name); return 0; } return 1; } /* Attempt repairing what went wrong with the extraction. Delete an already existing file or create missing intermediate directories. Return nonzero if we somewhat increased our chances at a successful extraction. errno is properly restored on zero return. */ static int maybe_recoverable (char *file_name, int *interdir_made) { if (*interdir_made) return 0; switch (errno) { case EEXIST: /* Remove an old file, if the options allow this. */ switch (old_files_option) { default: return 0; case DEFAULT_OLD_FILES: case OVERWRITE_OLD_DIRS: case OVERWRITE_OLD_FILES: { int r = remove_any_file (file_name, 0); errno = EEXIST; return r; } } case ENOENT: /* Attempt creating missing intermediate directories. */ if (! make_directories (file_name)) { errno = ENOENT; return 0; } *interdir_made = 1; return 1; default: /* Just say we can't do anything about it... */ return 0; } } static void extract_sparse_file (int fd, off_t *sizeleft, off_t totalsize, char *name) { int sparse_ind = 0; /* assuming sizeleft is initially totalsize */ while (*sizeleft > 0) { size_t written; size_t count; union block *data_block = find_next_block (); if (! data_block) { ERROR ((0, 0, _("Unexpected EOF in archive"))); return; } if (lseek (fd, sparsearray[sparse_ind].offset, SEEK_SET) < 0) { seek_error_details (name, sparsearray[sparse_ind].offset); return; } written = sparsearray[sparse_ind++].numbytes; while (written > BLOCKSIZE) { count = full_write (fd, data_block->buffer, BLOCKSIZE); written -= count; *sizeleft -= count; if (count != BLOCKSIZE) { write_error_details (name, count, BLOCKSIZE); return; } set_next_block_after (data_block); data_block = find_next_block (); if (! data_block) { ERROR ((0, 0, _("Unexpected EOF in archive"))); return; } } count = full_write (fd, data_block->buffer, written); *sizeleft -= count; if (count != written) { write_error_details (name, count, written); return; } set_next_block_after (data_block); } } /* Fix the statuses of all directories whose statuses need fixing, and which are not ancestors of FILE_NAME. If AFTER_SYMLINKS is nonzero, do this for all such directories; otherwise, stop at the first directory that is marked to be fixed up only after delayed symlinks are applied. */ static void apply_nonancestor_delayed_set_stat (char const *file_name, bool after_symlinks) { size_t file_name_len = strlen (file_name); bool check_for_renamed_directories = 0; while (delayed_set_stat_head) { struct delayed_set_stat *data = delayed_set_stat_head; bool skip_this_one = 0; struct stat st; struct stat const *current_stat_info = 0; check_for_renamed_directories |= data->after_symlinks; if (after_symlinks < data->after_symlinks || (data->file_name_len < file_name_len && file_name[data->file_name_len] && (ISSLASH (file_name[data->file_name_len]) || ISSLASH (file_name[data->file_name_len - 1])) && memcmp (file_name, data->file_name, data->file_name_len) == 0)) break; if (check_for_renamed_directories) { current_stat_info = &st; if (stat (data->file_name, &st) != 0) { stat_error (data->file_name); skip_this_one = 1; } else if (! (st.st_dev == data->stat_info.st_dev && (st.st_ino == data->stat_info.st_ino))) { ERROR ((0, 0, _("%s: Directory renamed before its status could be extracted"), quotearg_colon (data->file_name))); skip_this_one = 1; } } if (! skip_this_one) set_stat (data->file_name, &data->stat_info, current_stat_info, data->invert_permissions, data->permstatus, DIRTYPE); delayed_set_stat_head = data->next; free (data); } } /* Extract a file from the archive. */ void extract_archive (void) { union block *data_block; int fd; int status; size_t count; size_t name_length; size_t written; int openflag; mode_t mode; off_t size; size_t skipcrud; int counter; int interdir_made = 0; char typeflag; union block *exhdr; #define CURRENT_FILE_NAME (skipcrud + current_file_name) set_next_block_after (current_header); decode_header (current_header, ¤t_stat, ¤t_format, 1); if (interactive_option && !confirm ("extract", current_file_name)) { skip_member (); return; } /* Print the block from current_header and current_stat. */ if (verbose_option) print_header (); /* Check for fully specified file names and other atrocities. */ skipcrud = 0; if (! absolute_names_option) { if (contains_dot_dot (CURRENT_FILE_NAME)) { ERROR ((0, 0, _("%s: Member name contains `..'"), quotearg_colon (CURRENT_FILE_NAME))); skip_member (); return; } skipcrud = FILESYSTEM_PREFIX_LEN (current_file_name); while (ISSLASH (CURRENT_FILE_NAME[0])) skipcrud++; if (skipcrud) { static int warned_once; if (!warned_once) { warned_once = 1; WARN ((0, 0, _("Removing leading `%.*s' from member names"), (int) skipcrud, current_file_name)); } } } apply_nonancestor_delayed_set_stat (CURRENT_FILE_NAME, 0); /* Take a safety backup of a previously existing file. */ if (backup_option && !to_stdout_option) if (!maybe_backup_file (CURRENT_FILE_NAME, 0)) { int e = errno; ERROR ((0, e, _("%s: Was unable to backup this file"), quotearg_colon (CURRENT_FILE_NAME))); skip_member (); return; } /* Extract the archive entry according to its type. */ typeflag = current_header->header.typeflag; switch (typeflag) { /* JK - What we want to do if the file is sparse is loop through the array of sparse structures in the header and read in and translate the character strings representing 1) the offset at which to write and 2) how many bytes to write into numbers, which we store into the scratch array, "sparsearray". This array makes our life easier the same way it did in creating the tar file that had to deal with a sparse file. After we read in the first five (at most) sparse structures, we check to see if the file has an extended header, i.e., if more sparse structures are needed to describe the contents of the new file. If so, we read in the extended headers and continue to store their contents into the sparsearray. */ case GNUTYPE_SPARSE: sp_array_size = 10; sparsearray = xmalloc (sp_array_size * sizeof (struct sp_array)); for (counter = 0; counter < SPARSES_IN_OLDGNU_HEADER; counter++) { struct sparse const *s = ¤t_header->oldgnu_header.sp[counter]; sparsearray[counter].offset = OFF_FROM_HEADER (s->offset); sparsearray[counter].numbytes = SIZE_FROM_HEADER (s->numbytes); if (!sparsearray[counter].numbytes) break; } if (current_header->oldgnu_header.isextended) { /* Read in the list of extended headers and translate them into the sparsearray as before. Note that this invalidates current_header. */ /* static */ int ind = SPARSES_IN_OLDGNU_HEADER; while (1) { exhdr = find_next_block (); if (! exhdr) { ERROR ((0, 0, _("Unexpected EOF in archive"))); return; } for (counter = 0; counter < SPARSES_IN_SPARSE_HEADER; counter++) { struct sparse const *s = &exhdr->sparse_header.sp[counter]; if (counter + ind > sp_array_size - 1) { /* Realloc the scratch area since we've run out of room. */ sp_array_size *= 2; sparsearray = xrealloc (sparsearray, sp_array_size * sizeof (struct sp_array)); } if (s->numbytes[0] == 0) break; sparsearray[counter + ind].offset = OFF_FROM_HEADER (s->offset); sparsearray[counter + ind].numbytes = SIZE_FROM_HEADER (s->numbytes); } if (!exhdr->sparse_header.isextended) break; else { ind += SPARSES_IN_SPARSE_HEADER; set_next_block_after (exhdr); } } set_next_block_after (exhdr); } /* Fall through. */ case AREGTYPE: case REGTYPE: case CONTTYPE: /* Appears to be a file. But BSD tar uses the convention that a slash suffix means a directory. */ name_length = strlen (CURRENT_FILE_NAME); if (FILESYSTEM_PREFIX_LEN (CURRENT_FILE_NAME) < name_length && CURRENT_FILE_NAME[name_length - 1] == '/') goto really_dir; /* FIXME: deal with protection issues. */ again_file: openflag = (O_WRONLY | O_BINARY | O_CREAT | (old_files_option == OVERWRITE_OLD_FILES ? O_TRUNC : O_EXCL)); mode = current_stat.st_mode & MODE_RWX & ~ current_umask; if (to_stdout_option) { fd = STDOUT_FILENO; goto extract_file; } if (! prepare_to_extract (CURRENT_FILE_NAME)) { skip_member (); if (backup_option) undo_last_backup (); break; } #if O_CTG /* Contiguous files (on the Masscomp) have to specify the size in the open call that creates them. */ if (typeflag == CONTTYPE) fd = open (CURRENT_FILE_NAME, openflag | O_CTG, mode, current_stat.st_size); else fd = open (CURRENT_FILE_NAME, openflag, mode); #else /* not O_CTG */ if (typeflag == CONTTYPE) { static int conttype_diagnosed; if (!conttype_diagnosed) { conttype_diagnosed = 1; WARN ((0, 0, _("Extracting contiguous files as regular files"))); } } fd = open (CURRENT_FILE_NAME, openflag, mode); #endif /* not O_CTG */ if (fd < 0) { if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) goto again_file; open_error (CURRENT_FILE_NAME); skip_member (); if (backup_option) undo_last_backup (); break; } extract_file: if (typeflag == GNUTYPE_SPARSE) { char *name; size_t name_length_bis; /* Kludge alert. NAME is assigned to header.name because during the extraction, the space that contains the header will get scribbled on, and the name will get munged, so any error messages that happen to contain the filename will look REAL interesting unless we do this. */ name_length_bis = strlen (CURRENT_FILE_NAME) + 1; name = xmalloc (name_length_bis); memcpy (name, CURRENT_FILE_NAME, name_length_bis); size = current_stat.st_size; extract_sparse_file (fd, &size, current_stat.st_size, name); free (sparsearray); } else for (size = current_stat.st_size; size > 0; ) { if (multi_volume_option) { assign_string (&save_name, current_file_name); save_totsize = current_stat.st_size; save_sizeleft = size; } /* Locate data, determine max length writeable, write it, block that we have used the data, then check if the write worked. */ data_block = find_next_block (); if (! data_block) { ERROR ((0, 0, _("Unexpected EOF in archive"))); break; /* FIXME: What happens, then? */ } written = available_space_after (data_block); if (written > size) written = size; errno = 0; count = full_write (fd, data_block->buffer, written); size -= count; set_next_block_after ((union block *) (data_block->buffer + written - 1)); if (count != written) { write_error_details (CURRENT_FILE_NAME, count, written); break; } } skip_file (size); if (multi_volume_option) assign_string (&save_name, 0); /* If writing to stdout, don't try to do anything to the filename; it doesn't exist, or we don't want to touch it anyway. */ if (to_stdout_option) break; status = close (fd); if (status < 0) { close_error (CURRENT_FILE_NAME); if (backup_option) undo_last_backup (); } set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, (old_files_option == OVERWRITE_OLD_FILES ? UNKNOWN_PERMSTATUS : ARCHIVED_PERMSTATUS), typeflag); break; case SYMTYPE: #ifdef HAVE_SYMLINK if (! prepare_to_extract (CURRENT_FILE_NAME)) break; if (absolute_names_option || ! (ISSLASH (current_link_name [FILESYSTEM_PREFIX_LEN (current_link_name)]) || contains_dot_dot (current_link_name))) { while (status = symlink (current_link_name, CURRENT_FILE_NAME), status != 0) if (!maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) break; if (status == 0) set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, 0, SYMTYPE); else symlink_error (current_link_name, CURRENT_FILE_NAME); } else { /* This symbolic link is potentially dangerous. Don't create it now; instead, create a placeholder file, which will be replaced after other extraction is done. */ struct stat st; while (fd = open (CURRENT_FILE_NAME, O_WRONLY | O_CREAT | O_EXCL, 0), fd < 0) if (! maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) break; status = -1; if (fd < 0) open_error (CURRENT_FILE_NAME); else if (fstat (fd, &st) != 0) { stat_error (CURRENT_FILE_NAME); close (fd); } else if (close (fd) != 0) close_error (CURRENT_FILE_NAME); else { struct delayed_set_stat *h; struct delayed_symlink *p = xmalloc (offsetof (struct delayed_symlink, target) + strlen (current_link_name) + 1); p->next = delayed_symlink_head; delayed_symlink_head = p; p->dev = st.st_dev; p->ino = st.st_ino; p->mtime = st.st_mtime; p->uid = current_stat.st_uid; p->gid = current_stat.st_gid; p->sources = xmalloc (offsetof (struct string_list, string) + strlen (CURRENT_FILE_NAME) + 1); p->sources->next = 0; strcpy (p->sources->string, CURRENT_FILE_NAME); strcpy (p->target, current_link_name); h = delayed_set_stat_head; if (h && ! h->after_symlinks && strncmp (CURRENT_FILE_NAME, h->file_name, h->file_name_len) == 0 && ISSLASH (CURRENT_FILE_NAME[h->file_name_len]) && (base_name (CURRENT_FILE_NAME) == CURRENT_FILE_NAME + h->file_name_len + 1)) { do { h->after_symlinks = 1; if (stat (h->file_name, &st) != 0) stat_error (h->file_name); else { h->stat_info.st_dev = st.st_dev; h->stat_info.st_ino = st.st_ino; } } while ((h = h->next) && ! h->after_symlinks); } status = 0; } } if (status != 0 && backup_option) undo_last_backup (); break; #else { static int warned_once; if (!warned_once) { warned_once = 1; WARN ((0, 0, _("Attempting extraction of symbolic links as hard links"))); } } typeflag = LNKTYPE; /* Fall through. */ #endif case LNKTYPE: if (! prepare_to_extract (CURRENT_FILE_NAME)) break; again_link: { struct stat st1, st2; int e; size_t skiplinkcrud; if (absolute_names_option) skiplinkcrud = 0; else { skiplinkcrud = FILESYSTEM_PREFIX_LEN (current_link_name); while (ISSLASH (current_link_name[skiplinkcrud])) skiplinkcrud++; } /* MSDOS does not implement links. However, djgpp's link() actually copies the file. */ status = link (current_link_name + skiplinkcrud, CURRENT_FILE_NAME); if (status == 0) { struct delayed_symlink *ds = delayed_symlink_head; if (ds && stat (current_link_name, &st1) == 0) for (; ds; ds = ds->next) if (ds->dev == st1.st_dev && ds->ino == st1.st_ino && ds->mtime == st1.st_mtime) { struct string_list *p = xmalloc (offsetof (struct string_list, string) + strlen (CURRENT_FILE_NAME) + 1); strcpy (p->string, CURRENT_FILE_NAME); p->next = ds->sources; ds->sources = p; break; } break; } if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) goto again_link; if (incremental_option && errno == EEXIST) break; e = errno; if (stat (current_link_name, &st1) == 0 && stat (CURRENT_FILE_NAME, &st2) == 0 && st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) break; link_error (current_link_name, CURRENT_FILE_NAME); if (backup_option) undo_last_backup (); } break; #if S_IFCHR case CHRTYPE: current_stat.st_mode |= S_IFCHR; goto make_node; #endif #if S_IFBLK case BLKTYPE: current_stat.st_mode |= S_IFBLK; #endif #if S_IFCHR || S_IFBLK make_node: if (! prepare_to_extract (CURRENT_FILE_NAME)) break; status = mknod (CURRENT_FILE_NAME, current_stat.st_mode, current_stat.st_rdev); if (status != 0) { if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) goto make_node; mknod_error (CURRENT_FILE_NAME); if (backup_option) undo_last_backup (); break; }; set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, ARCHIVED_PERMSTATUS, typeflag); break; #endif #if HAVE_MKFIFO || defined mkfifo case FIFOTYPE: if (! prepare_to_extract (CURRENT_FILE_NAME)) break; while (status = mkfifo (CURRENT_FILE_NAME, current_stat.st_mode), status != 0) if (!maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) break; if (status == 0) set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, ARCHIVED_PERMSTATUS, typeflag); else { mkfifo_error (CURRENT_FILE_NAME); if (backup_option) undo_last_backup (); } break; #endif case DIRTYPE: case GNUTYPE_DUMPDIR: name_length = strlen (CURRENT_FILE_NAME); really_dir: /* Remove any redundant trailing "/"s. */ while (FILESYSTEM_PREFIX_LEN (CURRENT_FILE_NAME) < name_length && CURRENT_FILE_NAME[name_length - 1] == '/') name_length--; CURRENT_FILE_NAME[name_length] = '\0'; if (incremental_option) { /* Read the entry and delete files that aren't listed in the archive. */ gnu_restore (skipcrud); } else if (typeflag == GNUTYPE_DUMPDIR) skip_member (); { struct stat st; if (stat (CURRENT_FILE_NAME, &st) != 0 || !S_ISDIR (st.st_mode)) if (! prepare_to_extract (CURRENT_FILE_NAME)) break; } mode = ((current_stat.st_mode | (we_are_root ? 0 : MODE_WXUSR)) & MODE_RWX); again_dir: status = mkdir (CURRENT_FILE_NAME, mode); if (status != 0) { if (errno == EEXIST && (interdir_made || old_files_option == OVERWRITE_OLD_DIRS || old_files_option == OVERWRITE_OLD_FILES)) { struct stat st; if (stat (CURRENT_FILE_NAME, &st) == 0) { if (interdir_made) { repair_delayed_set_stat (CURRENT_FILE_NAME, &st); break; } if (S_ISDIR (st.st_mode)) { mode = st.st_mode & ~ current_umask; goto directory_exists; } } errno = EEXIST; } if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made)) goto again_dir; if (errno != EEXIST) { mkdir_error (CURRENT_FILE_NAME); if (backup_option) undo_last_backup (); break; } } directory_exists: if (status == 0 || old_files_option == OVERWRITE_OLD_DIRS || old_files_option == OVERWRITE_OLD_FILES) delay_set_stat (CURRENT_FILE_NAME, ¤t_stat, MODE_RWX & (mode ^ current_stat.st_mode), (status == 0 ? ARCHIVED_PERMSTATUS : UNKNOWN_PERMSTATUS)); break; case GNUTYPE_VOLHDR: if (verbose_option) fprintf (stdlis, _("Reading %s\n"), quote (current_file_name)); break; case GNUTYPE_NAMES: extract_mangle (); break; case GNUTYPE_MULTIVOL: ERROR ((0, 0, _("%s: Cannot extract -- file is continued from another volume"), quotearg_colon (current_file_name))); skip_member (); if (backup_option) undo_last_backup (); break; case GNUTYPE_LONGNAME: case GNUTYPE_LONGLINK: ERROR ((0, 0, _("Visible long name error"))); skip_member (); if (backup_option) undo_last_backup (); break; default: WARN ((0, 0, _("%s: Unknown file type '%c', extracted as normal file"), quotearg_colon (CURRENT_FILE_NAME), typeflag)); goto again_file; } #undef CURRENT_FILE_NAME } /* Extract the symbolic links whose final extraction were delayed. */ static void apply_delayed_symlinks (void) { struct delayed_symlink *ds; for (ds = delayed_symlink_head; ds; ) { struct string_list *sources = ds->sources; char const *valid_source = 0; for (sources = ds->sources; sources; sources = sources->next) { char const *source = sources->string; struct stat st; /* Make sure the placeholder file is still there. If not, don't create a symlink, as the placeholder was probably removed by a later extraction. */ if (lstat (source, &st) == 0 && st.st_dev == ds->dev && st.st_ino == ds->ino && st.st_mtime == ds->mtime) { /* Unlink the placeholder, then create a hard link if possible, a symbolic link otherwise. */ if (unlink (source) != 0) unlink_error (source); else if (valid_source && link (valid_source, source) == 0) ; else if (symlink (ds->target, source) != 0) symlink_error (ds->target, source); else { valid_source = source; st.st_uid = ds->uid; st.st_gid = ds->gid; set_stat (source, &st, 0, 0, 0, SYMTYPE); } } } for (sources = ds->sources; sources; ) { struct string_list *next = sources->next; free (sources); sources = next; } { struct delayed_symlink *next = ds->next; free (ds); ds = next; } } delayed_symlink_head = 0; } /* Finish the extraction of an archive. */ void extract_finish (void) { /* First, fix the status of ordinary directories that need fixing. */ apply_nonancestor_delayed_set_stat ("", 0); /* Then, apply delayed symlinks, so that they don't affect delayed directory status-setting for ordinary directories. */ apply_delayed_symlinks (); /* Finally, fix the status of directories that are ancestors of delayed symlinks. */ apply_nonancestor_delayed_set_stat ("", 1); } void fatal_exit (void) { extract_finish (); error (TAREXIT_FAILURE, 0, _("Error is not recoverable: exiting now")); abort (); }