Contents of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/data_extract_all.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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File size: 5698 byte(s)
Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 5698 byte(s)
-updated to busybox-1.17.1
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 ENABLE_FEATURE_TAR_SELINUX |
16 | char *sctx = archive_handle->tar__next_file_sctx; |
17 | if (!sctx) |
18 | sctx = archive_handle->tar__global_sctx; |
19 | if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */ |
20 | setfscreatecon(sctx); |
21 | free(archive_handle->tar__next_file_sctx); |
22 | archive_handle->tar__next_file_sctx = NULL; |
23 | } |
24 | #endif |
25 | |
26 | if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) { |
27 | char *slash = strrchr(file_header->name, '/'); |
28 | if (slash) { |
29 | *slash = '\0'; |
30 | bb_make_directory(file_header->name, -1, FILEUTILS_RECUR); |
31 | *slash = '/'; |
32 | } |
33 | } |
34 | |
35 | if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) { |
36 | /* Remove the entry if it exists */ |
37 | if (!S_ISDIR(file_header->mode)) { |
38 | /* Is it hardlink? |
39 | * We encode hard links as regular files of size 0 with a symlink */ |
40 | if (S_ISREG(file_header->mode) |
41 | && file_header->link_target |
42 | && file_header->size == 0 |
43 | ) { |
44 | /* Ugly special case: |
45 | * tar cf t.tar hardlink1 hardlink2 hardlink1 |
46 | * results in this tarball structure: |
47 | * hardlink1 |
48 | * hardlink2 -> hardlink1 |
49 | * hardlink1 -> hardlink1 <== !!! |
50 | */ |
51 | if (strcmp(file_header->link_target, file_header->name) == 0) |
52 | goto ret; |
53 | } |
54 | /* Proceed with deleting */ |
55 | if (unlink(file_header->name) == -1 |
56 | && errno != ENOENT |
57 | ) { |
58 | bb_perror_msg_and_die("can't remove old file %s", |
59 | file_header->name); |
60 | } |
61 | } |
62 | } |
63 | else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) { |
64 | /* Remove the existing entry if its older than the extracted entry */ |
65 | struct stat existing_sb; |
66 | if (lstat(file_header->name, &existing_sb) == -1) { |
67 | if (errno != ENOENT) { |
68 | bb_perror_msg_and_die("can't stat old file"); |
69 | } |
70 | } |
71 | else if (existing_sb.st_mtime >= file_header->mtime) { |
72 | if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) { |
73 | bb_error_msg("%s not created: newer or " |
74 | "same age file exists", file_header->name); |
75 | } |
76 | data_skip(archive_handle); |
77 | goto ret; |
78 | } |
79 | else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) { |
80 | bb_perror_msg_and_die("can't remove old file %s", |
81 | file_header->name); |
82 | } |
83 | } |
84 | |
85 | /* Handle hard links separately |
86 | * We encode hard links as regular files of size 0 with a symlink */ |
87 | if (S_ISREG(file_header->mode) |
88 | && file_header->link_target |
89 | && file_header->size == 0 |
90 | ) { |
91 | /* hard link */ |
92 | res = link(file_header->link_target, file_header->name); |
93 | if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) { |
94 | bb_perror_msg("can't create %slink " |
95 | "from %s to %s", "hard", |
96 | file_header->name, |
97 | file_header->link_target); |
98 | } |
99 | /* Hardlinks have no separate mode/ownership, skip chown/chmod */ |
100 | goto ret; |
101 | } |
102 | |
103 | /* Create the filesystem entry */ |
104 | switch (file_header->mode & S_IFMT) { |
105 | case S_IFREG: { |
106 | /* Regular file */ |
107 | int flags = O_WRONLY | O_CREAT | O_EXCL; |
108 | if (archive_handle->ah_flags & ARCHIVE_O_TRUNC) |
109 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
110 | dst_fd = xopen3(file_header->name, |
111 | flags, |
112 | file_header->mode |
113 | ); |
114 | bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size); |
115 | close(dst_fd); |
116 | break; |
117 | } |
118 | case S_IFDIR: |
119 | res = mkdir(file_header->name, file_header->mode); |
120 | if ((res == -1) |
121 | && (errno != EISDIR) /* btw, Linux doesn't return this */ |
122 | && (errno != EEXIST) |
123 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) |
124 | ) { |
125 | bb_perror_msg("can't make dir %s", file_header->name); |
126 | } |
127 | break; |
128 | case S_IFLNK: |
129 | /* Symlink */ |
130 | //TODO: what if file_header->link_target == NULL (say, corrupted tarball?) |
131 | res = symlink(file_header->link_target, file_header->name); |
132 | if ((res == -1) |
133 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) |
134 | ) { |
135 | bb_perror_msg("can't create %slink " |
136 | "from %s to %s", "sym", |
137 | file_header->name, |
138 | file_header->link_target); |
139 | } |
140 | break; |
141 | case S_IFSOCK: |
142 | case S_IFBLK: |
143 | case S_IFCHR: |
144 | case S_IFIFO: |
145 | res = mknod(file_header->name, file_header->mode, file_header->device); |
146 | if ((res == -1) |
147 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET) |
148 | ) { |
149 | bb_perror_msg("can't create node %s", file_header->name); |
150 | } |
151 | break; |
152 | default: |
153 | bb_error_msg_and_die("unrecognized file type"); |
154 | } |
155 | |
156 | if (!S_ISLNK(file_header->mode)) { |
157 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) { |
158 | uid_t uid = file_header->uid; |
159 | gid_t gid = file_header->gid; |
160 | #if ENABLE_FEATURE_TAR_UNAME_GNAME |
161 | if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) { |
162 | if (file_header->tar__uname) { |
163 | //TODO: cache last name/id pair? |
164 | struct passwd *pwd = getpwnam(file_header->tar__uname); |
165 | if (pwd) uid = pwd->pw_uid; |
166 | } |
167 | if (file_header->tar__gname) { |
168 | struct group *grp = getgrnam(file_header->tar__gname); |
169 | if (grp) gid = grp->gr_gid; |
170 | } |
171 | } |
172 | #endif |
173 | /* GNU tar 1.15.1 uses chown, not lchown */ |
174 | chown(file_header->name, uid, gid); |
175 | } |
176 | /* uclibc has no lchmod, glibc is even stranger - |
177 | * it has lchmod which seems to do nothing! |
178 | * so we use chmod... */ |
179 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) { |
180 | chmod(file_header->name, file_header->mode); |
181 | } |
182 | if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) { |
183 | struct timeval t[2]; |
184 | |
185 | t[1].tv_sec = t[0].tv_sec = file_header->mtime; |
186 | t[1].tv_usec = t[0].tv_usec = 0; |
187 | utimes(file_header->name, t); |
188 | } |
189 | } |
190 | |
191 | ret: ; |
192 | #if ENABLE_FEATURE_TAR_SELINUX |
193 | if (sctx) { |
194 | /* reset the context after creating an entry */ |
195 | setfscreatecon(NULL); |
196 | } |
197 | #endif |
198 | } |