2 031ddeb2 2005-07-22 devnull * tar - `tape archiver', actually usable on any medium.
3 031ddeb2 2005-07-22 devnull * POSIX "ustar" compliant when extracting, and by default when creating.
4 031ddeb2 2005-07-22 devnull * this tar attempts to read and write multiple Tblock-byte blocks
5 031ddeb2 2005-07-22 devnull * at once to and from the filesystem, and does not copy blocks
6 031ddeb2 2005-07-22 devnull * around internally.
9 031ddeb2 2005-07-22 devnull #include <u.h>
10 031ddeb2 2005-07-22 devnull #include <libc.h>
11 031ddeb2 2005-07-22 devnull #include <fcall.h> /* for %M */
12 67e944db 2005-07-22 devnull #include <libString.h>
15 031ddeb2 2005-07-22 devnull * modified versions of those in libc.h; scans only the first arg for
16 031ddeb2 2005-07-22 devnull * keyletters and options.
18 031ddeb2 2005-07-22 devnull #define TARGBEGIN {\
19 14f06f67 2005-07-22 devnull if (argv0 == nil)\
20 14f06f67 2005-07-22 devnull argv0 = *argv;\
21 14f06f67 2005-07-22 devnull argv++, argc--;\
22 031ddeb2 2005-07-22 devnull if (argv[0]) {\
23 031ddeb2 2005-07-22 devnull char *_args, *_argt;\
24 031ddeb2 2005-07-22 devnull Rune _argc;\
25 031ddeb2 2005-07-22 devnull _args = &argv[0][0];\
26 031ddeb2 2005-07-22 devnull _argc = 0;\
27 031ddeb2 2005-07-22 devnull while(*_args && (_args += chartorune(&_argc, _args)))\
28 031ddeb2 2005-07-22 devnull switch(_argc)
29 031ddeb2 2005-07-22 devnull #define TARGEND SET(_argt); USED(_argt);USED(_argc);USED(_args); \
30 031ddeb2 2005-07-22 devnull argc--, argv++; } \
31 031ddeb2 2005-07-22 devnull USED(argv); USED(argc); }
32 031ddeb2 2005-07-22 devnull #define TARGC() (_argc)
34 031ddeb2 2005-07-22 devnull #define ROUNDUP(a, b) (((a) + (b) - 1)/(b))
35 031ddeb2 2005-07-22 devnull #define BYTES2TBLKS(bytes) ROUNDUP(bytes, Tblock)
37 031ddeb2 2005-07-22 devnull typedef vlong Off;
38 031ddeb2 2005-07-22 devnull typedef char *(*Refill)(int ar, char *bufs, int justhdr);
40 031ddeb2 2005-07-22 devnull enum { Stdin, Stdout, Stderr };
41 031ddeb2 2005-07-22 devnull enum { Rd, Wr }; /* pipe fd-array indices */
42 031ddeb2 2005-07-22 devnull enum { Output, Input };
43 031ddeb2 2005-07-22 devnull enum { None, Toc, Xtract, Replace };
44 031ddeb2 2005-07-22 devnull enum { Alldata, Justnxthdr };
46 031ddeb2 2005-07-22 devnull Tblock = 512,
47 031ddeb2 2005-07-22 devnull Nblock = 40, /* maximum blocksize */
48 031ddeb2 2005-07-22 devnull Dblock = 20, /* default blocksize */
49 031ddeb2 2005-07-22 devnull Namsiz = 100,
50 031ddeb2 2005-07-22 devnull Maxpfx = 155, /* from POSIX */
51 031ddeb2 2005-07-22 devnull Maxname = Namsiz + 1 + Maxpfx,
52 031ddeb2 2005-07-22 devnull DEBUG = 0,
55 031ddeb2 2005-07-22 devnull /* POSIX link flags */
57 031ddeb2 2005-07-22 devnull LF_PLAIN1 = '\0',
58 031ddeb2 2005-07-22 devnull LF_PLAIN2 = '0',
59 031ddeb2 2005-07-22 devnull LF_LINK = '1',
60 031ddeb2 2005-07-22 devnull LF_SYMLINK1 = '2',
61 031ddeb2 2005-07-22 devnull LF_SYMLINK2 = 's',
62 031ddeb2 2005-07-22 devnull LF_CHR = '3',
63 031ddeb2 2005-07-22 devnull LF_BLK = '4',
64 031ddeb2 2005-07-22 devnull LF_DIR = '5',
65 031ddeb2 2005-07-22 devnull LF_FIFO = '6',
66 031ddeb2 2005-07-22 devnull LF_CONTIG = '7',
67 031ddeb2 2005-07-22 devnull /* 'A' - 'Z' are reserved for custom implementations */
70 031ddeb2 2005-07-22 devnull #define islink(lf) (isreallink(lf) || issymlink(lf))
71 031ddeb2 2005-07-22 devnull #define isreallink(lf) ((lf) == LF_LINK)
72 031ddeb2 2005-07-22 devnull #define issymlink(lf) ((lf) == LF_SYMLINK1 || (lf) == LF_SYMLINK2)
74 14f06f67 2005-07-22 devnull typedef struct {
75 14f06f67 2005-07-22 devnull char name[Namsiz];
76 14f06f67 2005-07-22 devnull char mode[8];
77 14f06f67 2005-07-22 devnull char uid[8];
78 14f06f67 2005-07-22 devnull char gid[8];
79 14f06f67 2005-07-22 devnull char size[12];
80 14f06f67 2005-07-22 devnull char mtime[12];
81 14f06f67 2005-07-22 devnull char chksum[8];
82 14f06f67 2005-07-22 devnull char linkflag;
83 14f06f67 2005-07-22 devnull char linkname[Namsiz];
85 14f06f67 2005-07-22 devnull /* rest are defined by POSIX's ustar format; see p1003.2b */
86 14f06f67 2005-07-22 devnull char magic[6]; /* "ustar" */
87 14f06f67 2005-07-22 devnull char version[2];
88 14f06f67 2005-07-22 devnull char uname[32];
89 14f06f67 2005-07-22 devnull char gname[32];
90 14f06f67 2005-07-22 devnull char devmajor[8];
91 14f06f67 2005-07-22 devnull char devminor[8];
92 14f06f67 2005-07-22 devnull char prefix[Maxpfx]; /* if non-null, path= prefix "/" name */
95 031ddeb2 2005-07-22 devnull typedef struct {
96 031ddeb2 2005-07-22 devnull char *comp;
97 031ddeb2 2005-07-22 devnull char *decomp;
98 031ddeb2 2005-07-22 devnull char *sfx[4];
99 031ddeb2 2005-07-22 devnull } Compress;
101 031ddeb2 2005-07-22 devnull static Compress comps[] = {
102 031ddeb2 2005-07-22 devnull "gzip", "gunzip", { ".tar.gz", ".tgz" }, /* default */
103 031ddeb2 2005-07-22 devnull "compress", "uncompress", { ".tar.Z", ".tz" },
104 031ddeb2 2005-07-22 devnull "bzip2", "bunzip2", { ".tar.bz", ".tbz",
105 031ddeb2 2005-07-22 devnull ".tar.bz2",".tbz2" },
108 031ddeb2 2005-07-22 devnull typedef struct {
109 031ddeb2 2005-07-22 devnull int kid;
110 031ddeb2 2005-07-22 devnull int fd; /* original fd */
111 031ddeb2 2005-07-22 devnull int rfd; /* replacement fd */
112 031ddeb2 2005-07-22 devnull int input;
113 031ddeb2 2005-07-22 devnull int open;
114 031ddeb2 2005-07-22 devnull } Pushstate;
116 031ddeb2 2005-07-22 devnull #define OTHER(rdwr) (rdwr == Rd? Wr: Rd)
118 67e944db 2005-07-22 devnull /* static int debug; */
119 031ddeb2 2005-07-22 devnull static int verb;
120 031ddeb2 2005-07-22 devnull static int posix = 1;
121 031ddeb2 2005-07-22 devnull static int docreate;
122 031ddeb2 2005-07-22 devnull static int aruid;
123 031ddeb2 2005-07-22 devnull static int argid;
124 031ddeb2 2005-07-22 devnull static int relative = 1;
125 031ddeb2 2005-07-22 devnull static int settime;
126 031ddeb2 2005-07-22 devnull static int verbose;
127 031ddeb2 2005-07-22 devnull static int docompress;
128 031ddeb2 2005-07-22 devnull static int keepexisting;
129 031ddeb2 2005-07-22 devnull static Off blkoff; /* offset of the current archive block (not Tblock) */
130 031ddeb2 2005-07-22 devnull static Off nexthdr;
132 031ddeb2 2005-07-22 devnull static int nblock = Dblock;
133 031ddeb2 2005-07-22 devnull static char *usefile;
134 031ddeb2 2005-07-22 devnull static char origdir[Maxname*2];
135 031ddeb2 2005-07-22 devnull static Hdr *tpblk, *endblk;
136 031ddeb2 2005-07-22 devnull static Hdr *curblk;
138 031ddeb2 2005-07-22 devnull static void
139 031ddeb2 2005-07-22 devnull usage(void)
141 031ddeb2 2005-07-22 devnull fprint(2, "usage: %s {crtx}[PRTfgkmpuvz] [archive] file1 file2...\n",
143 031ddeb2 2005-07-22 devnull exits("usage");
146 031ddeb2 2005-07-22 devnull /* compression */
148 031ddeb2 2005-07-22 devnull static Compress *
149 031ddeb2 2005-07-22 devnull compmethod(char *name)
151 031ddeb2 2005-07-22 devnull int i, nmlen = strlen(name), sfxlen;
152 031ddeb2 2005-07-22 devnull Compress *cp;
154 031ddeb2 2005-07-22 devnull for (cp = comps; cp < comps + nelem(comps); cp++)
155 031ddeb2 2005-07-22 devnull for (i = 0; i < nelem(cp->sfx) && cp->sfx[i]; i++) {
156 031ddeb2 2005-07-22 devnull sfxlen = strlen(cp->sfx[i]);
157 031ddeb2 2005-07-22 devnull if (nmlen > sfxlen &&
158 031ddeb2 2005-07-22 devnull strcmp(cp->sfx[i], name + nmlen - sfxlen) == 0)
159 031ddeb2 2005-07-22 devnull return cp;
161 031ddeb2 2005-07-22 devnull return docompress? comps: nil;
165 031ddeb2 2005-07-22 devnull * push a filter, cmd, onto fd. if input, it's an input descriptor.
166 031ddeb2 2005-07-22 devnull * returns a descriptor to replace fd, or -1 on error.
168 031ddeb2 2005-07-22 devnull static int
169 031ddeb2 2005-07-22 devnull push(int fd, char *cmd, int input, Pushstate *ps)
171 031ddeb2 2005-07-22 devnull int nfd, pifds[2];
172 031ddeb2 2005-07-22 devnull String *s;
174 031ddeb2 2005-07-22 devnull ps->open = 0;
175 031ddeb2 2005-07-22 devnull ps->fd = fd;
176 031ddeb2 2005-07-22 devnull ps->input = input;
177 031ddeb2 2005-07-22 devnull if (fd < 0 || pipe(pifds) < 0)
178 031ddeb2 2005-07-22 devnull return -1;
179 031ddeb2 2005-07-22 devnull ps->kid = fork();
180 031ddeb2 2005-07-22 devnull switch (ps->kid) {
181 031ddeb2 2005-07-22 devnull case -1:
182 031ddeb2 2005-07-22 devnull return -1;
184 031ddeb2 2005-07-22 devnull if (input)
185 031ddeb2 2005-07-22 devnull dup(pifds[Wr], Stdout);
187 031ddeb2 2005-07-22 devnull dup(pifds[Rd], Stdin);
188 031ddeb2 2005-07-22 devnull close(pifds[input? Rd: Wr]);
189 031ddeb2 2005-07-22 devnull dup(fd, (input? Stdin: Stdout));
190 031ddeb2 2005-07-22 devnull s = s_new();
191 031ddeb2 2005-07-22 devnull if (cmd[0] != '/')
192 031ddeb2 2005-07-22 devnull s_append(s, "/bin/");
193 031ddeb2 2005-07-22 devnull s_append(s, cmd);
194 031ddeb2 2005-07-22 devnull execl(s_to_c(s), cmd, nil);
195 031ddeb2 2005-07-22 devnull sysfatal("can't exec %s: %r", cmd);
196 031ddeb2 2005-07-22 devnull default:
197 031ddeb2 2005-07-22 devnull nfd = pifds[input? Rd: Wr];
198 031ddeb2 2005-07-22 devnull close(pifds[input? Wr: Rd]);
201 031ddeb2 2005-07-22 devnull ps->rfd = nfd;
202 031ddeb2 2005-07-22 devnull ps->open = 1;
203 031ddeb2 2005-07-22 devnull return nfd;
206 031ddeb2 2005-07-22 devnull static char *
207 031ddeb2 2005-07-22 devnull pushclose(Pushstate *ps)
209 031ddeb2 2005-07-22 devnull Waitmsg *wm;
211 031ddeb2 2005-07-22 devnull if (ps->fd < 0 || ps->rfd < 0 || !ps->open)
212 031ddeb2 2005-07-22 devnull return "not open";
213 031ddeb2 2005-07-22 devnull close(ps->rfd);
214 031ddeb2 2005-07-22 devnull ps->rfd = -1;
215 031ddeb2 2005-07-22 devnull ps->open = 0;
216 031ddeb2 2005-07-22 devnull while ((wm = wait()) != nil && wm->pid != ps->kid)
217 031ddeb2 2005-07-22 devnull continue;
218 031ddeb2 2005-07-22 devnull return wm? wm->msg: nil;
222 031ddeb2 2005-07-22 devnull * block-buffer management
225 031ddeb2 2005-07-22 devnull static void
226 031ddeb2 2005-07-22 devnull initblks(void)
228 031ddeb2 2005-07-22 devnull free(tpblk);
229 031ddeb2 2005-07-22 devnull tpblk = malloc(Tblock * nblock);
230 031ddeb2 2005-07-22 devnull assert(tpblk != nil);
231 031ddeb2 2005-07-22 devnull endblk = tpblk + nblock;
235 031ddeb2 2005-07-22 devnull * (re)fill block buffers from archive. `justhdr' means we don't care
236 031ddeb2 2005-07-22 devnull * about the data before the next header block.
238 031ddeb2 2005-07-22 devnull static char *
239 031ddeb2 2005-07-22 devnull refill(int ar, char *bufs, int justhdr)
241 031ddeb2 2005-07-22 devnull int i, n;
242 031ddeb2 2005-07-22 devnull unsigned bytes = Tblock * nblock;
243 031ddeb2 2005-07-22 devnull static int done, first = 1, seekable;
245 031ddeb2 2005-07-22 devnull if (done)
246 031ddeb2 2005-07-22 devnull return nil;
248 031ddeb2 2005-07-22 devnull if (first)
249 031ddeb2 2005-07-22 devnull seekable = seek(ar, 0, 1) >= 0;
250 031ddeb2 2005-07-22 devnull /* try to size non-pipe input at first read */
251 031ddeb2 2005-07-22 devnull if (first && usefile) {
252 031ddeb2 2005-07-22 devnull blkoff = seek(ar, 0, 1); /* note position */
253 031ddeb2 2005-07-22 devnull n = read(ar, bufs, bytes);
254 031ddeb2 2005-07-22 devnull if (n <= 0)
255 031ddeb2 2005-07-22 devnull sysfatal("error reading archive: %r");
257 031ddeb2 2005-07-22 devnull if (i % Tblock != 0) {
258 031ddeb2 2005-07-22 devnull fprint(2, "%s: archive block size (%d) error\n",
259 031ddeb2 2005-07-22 devnull argv0, i);
260 031ddeb2 2005-07-22 devnull exits("blocksize");
262 031ddeb2 2005-07-22 devnull i /= Tblock;
263 031ddeb2 2005-07-22 devnull if (i != nblock) {
264 031ddeb2 2005-07-22 devnull nblock = i;
265 031ddeb2 2005-07-22 devnull fprint(2, "%s: blocking = %d\n", argv0, nblock);
266 031ddeb2 2005-07-22 devnull endblk = (Hdr *)bufs + nblock;
267 031ddeb2 2005-07-22 devnull bytes = n;
269 031ddeb2 2005-07-22 devnull } else if (justhdr && seekable && nexthdr - seek(ar, 0, 1) >= bytes) {
270 031ddeb2 2005-07-22 devnull /* optimisation for huge archive members on seekable media */
271 031ddeb2 2005-07-22 devnull if (seek(ar, bytes, 1) < 0)
272 031ddeb2 2005-07-22 devnull sysfatal("can't seek on archive: %r");
273 031ddeb2 2005-07-22 devnull n = bytes;
275 031ddeb2 2005-07-22 devnull n = readn(ar, bufs, bytes);
276 031ddeb2 2005-07-22 devnull first = 0;
278 031ddeb2 2005-07-22 devnull if (n == 0)
279 031ddeb2 2005-07-22 devnull sysfatal("unexpected EOF reading archive");
280 031ddeb2 2005-07-22 devnull else if (n < 0)
281 031ddeb2 2005-07-22 devnull sysfatal("error reading archive: %r");
282 031ddeb2 2005-07-22 devnull else if (n%Tblock != 0)
283 031ddeb2 2005-07-22 devnull sysfatal("partial block read from archive");
284 031ddeb2 2005-07-22 devnull if (n != bytes) {
285 031ddeb2 2005-07-22 devnull done = 1;
286 031ddeb2 2005-07-22 devnull memset(bufs + n, 0, bytes - n);
288 031ddeb2 2005-07-22 devnull return bufs;
291 031ddeb2 2005-07-22 devnull static Hdr *
292 031ddeb2 2005-07-22 devnull getblk(int ar, Refill rfp, int justhdr)
294 031ddeb2 2005-07-22 devnull if (curblk == nil || curblk >= endblk) { /* input block exhausted? */
295 031ddeb2 2005-07-22 devnull if (rfp != nil && (*rfp)(ar, (char *)tpblk, justhdr) == nil)
296 031ddeb2 2005-07-22 devnull return nil;
297 031ddeb2 2005-07-22 devnull curblk = tpblk;
299 031ddeb2 2005-07-22 devnull return curblk++;
302 031ddeb2 2005-07-22 devnull static Hdr *
303 031ddeb2 2005-07-22 devnull getblkrd(int ar, int justhdr)
305 031ddeb2 2005-07-22 devnull return getblk(ar, refill, justhdr);
308 031ddeb2 2005-07-22 devnull static Hdr *
309 031ddeb2 2005-07-22 devnull getblke(int ar)
311 031ddeb2 2005-07-22 devnull return getblk(ar, nil, Alldata);
314 031ddeb2 2005-07-22 devnull static Hdr *
315 031ddeb2 2005-07-22 devnull getblkz(int ar)
317 031ddeb2 2005-07-22 devnull Hdr *hp = getblke(ar);
319 031ddeb2 2005-07-22 devnull if (hp != nil)
320 14f06f67 2005-07-22 devnull memset(hp, 0, Tblock);
321 031ddeb2 2005-07-22 devnull return hp;
325 031ddeb2 2005-07-22 devnull * how many block buffers are available, starting at the address
326 031ddeb2 2005-07-22 devnull * just returned by getblk*?
328 031ddeb2 2005-07-22 devnull static int
329 031ddeb2 2005-07-22 devnull gothowmany(int max)
331 031ddeb2 2005-07-22 devnull int n = endblk - (curblk - 1);
333 031ddeb2 2005-07-22 devnull return n > max? max: n;
337 031ddeb2 2005-07-22 devnull * indicate that one is done with the last block obtained from getblke
338 031ddeb2 2005-07-22 devnull * and it is now available to be written into the archive.
340 031ddeb2 2005-07-22 devnull static void
341 031ddeb2 2005-07-22 devnull putlastblk(int ar)
343 031ddeb2 2005-07-22 devnull unsigned bytes = Tblock * nblock;
345 031ddeb2 2005-07-22 devnull /* if writing end-of-archive, aid compression (good hygiene too) */
346 031ddeb2 2005-07-22 devnull if (curblk < endblk)
347 031ddeb2 2005-07-22 devnull memset(curblk, 0, (char *)endblk - (char *)curblk);
348 031ddeb2 2005-07-22 devnull if (write(ar, tpblk, bytes) != bytes)
349 031ddeb2 2005-07-22 devnull sysfatal("error writing archive: %r");
352 031ddeb2 2005-07-22 devnull static void
353 031ddeb2 2005-07-22 devnull putblk(int ar)
355 031ddeb2 2005-07-22 devnull if (curblk >= endblk)
356 031ddeb2 2005-07-22 devnull putlastblk(ar);
359 031ddeb2 2005-07-22 devnull static void
360 031ddeb2 2005-07-22 devnull putbackblk(int ar)
362 031ddeb2 2005-07-22 devnull curblk--;
363 031ddeb2 2005-07-22 devnull USED(ar);
366 031ddeb2 2005-07-22 devnull static void
367 031ddeb2 2005-07-22 devnull putreadblks(int ar, int blks)
369 031ddeb2 2005-07-22 devnull curblk += blks - 1;
370 031ddeb2 2005-07-22 devnull USED(ar);
373 031ddeb2 2005-07-22 devnull static void
374 031ddeb2 2005-07-22 devnull putblkmany(int ar, int blks)
376 031ddeb2 2005-07-22 devnull curblk += blks - 1;
377 031ddeb2 2005-07-22 devnull putblk(ar);
381 031ddeb2 2005-07-22 devnull * common routines
385 031ddeb2 2005-07-22 devnull * modifies hp->chksum but restores it; important for the last block of the
386 031ddeb2 2005-07-22 devnull * old archive when updating with `tar rf archive'
389 031ddeb2 2005-07-22 devnull chksum(Hdr *hp)
391 031ddeb2 2005-07-22 devnull int n = Tblock;
392 031ddeb2 2005-07-22 devnull long i = 0;
393 14f06f67 2005-07-22 devnull uchar *cp = (uchar*)hp;
394 031ddeb2 2005-07-22 devnull char oldsum[sizeof hp->chksum];
396 031ddeb2 2005-07-22 devnull memmove(oldsum, hp->chksum, sizeof oldsum);
397 031ddeb2 2005-07-22 devnull memset(hp->chksum, ' ', sizeof hp->chksum);
398 031ddeb2 2005-07-22 devnull while (n-- > 0)
399 031ddeb2 2005-07-22 devnull i += *cp++;
400 031ddeb2 2005-07-22 devnull memmove(hp->chksum, oldsum, sizeof oldsum);
401 031ddeb2 2005-07-22 devnull return i;
404 031ddeb2 2005-07-22 devnull static int
405 031ddeb2 2005-07-22 devnull isustar(Hdr *hp)
407 031ddeb2 2005-07-22 devnull return strcmp(hp->magic, "ustar") == 0;
411 031ddeb2 2005-07-22 devnull * s is at most n bytes long, but need not be NUL-terminated.
412 031ddeb2 2005-07-22 devnull * if shorter than n bytes, all bytes after the first NUL must also
413 031ddeb2 2005-07-22 devnull * be NUL.
415 031ddeb2 2005-07-22 devnull static int
416 031ddeb2 2005-07-22 devnull strnlen(char *s, int n)
418 031ddeb2 2005-07-22 devnull return s[n - 1] != '\0'? n: strlen(s);
421 031ddeb2 2005-07-22 devnull /* set fullname from header */
422 031ddeb2 2005-07-22 devnull static char *
423 031ddeb2 2005-07-22 devnull name(Hdr *hp)
425 031ddeb2 2005-07-22 devnull int pfxlen, namlen;
426 031ddeb2 2005-07-22 devnull static char fullnamebuf[2 + Maxname + 1]; /* 2 at beginning for ./ on relative names */
427 031ddeb2 2005-07-22 devnull char *fullname;
429 031ddeb2 2005-07-22 devnull fullname = fullnamebuf+2;
430 031ddeb2 2005-07-22 devnull namlen = strnlen(hp->name, sizeof hp->name);
431 031ddeb2 2005-07-22 devnull if (hp->prefix[0] == '\0' || !isustar(hp)) { /* old-style name? */
432 031ddeb2 2005-07-22 devnull memmove(fullname, hp->name, namlen);
433 031ddeb2 2005-07-22 devnull fullname[namlen] = '\0';
434 031ddeb2 2005-07-22 devnull return fullname;
437 031ddeb2 2005-07-22 devnull /* name is in two pieces */
438 031ddeb2 2005-07-22 devnull pfxlen = strnlen(hp->prefix, sizeof hp->prefix);
439 031ddeb2 2005-07-22 devnull memmove(fullname, hp->prefix, pfxlen);
440 031ddeb2 2005-07-22 devnull fullname[pfxlen] = '/';
441 031ddeb2 2005-07-22 devnull memmove(fullname + pfxlen + 1, hp->name, namlen);
442 031ddeb2 2005-07-22 devnull fullname[pfxlen + 1 + namlen] = '\0';
443 031ddeb2 2005-07-22 devnull return fullname;
446 031ddeb2 2005-07-22 devnull static int
447 031ddeb2 2005-07-22 devnull isdir(Hdr *hp)
449 031ddeb2 2005-07-22 devnull /* the mode test is ugly but sometimes necessary */
450 031ddeb2 2005-07-22 devnull return hp->linkflag == LF_DIR ||
451 031ddeb2 2005-07-22 devnull strrchr(name(hp), '\0')[-1] == '/' ||
452 031ddeb2 2005-07-22 devnull (strtoul(hp->mode, nil, 8)&0170000) == 040000;
455 031ddeb2 2005-07-22 devnull static int
456 031ddeb2 2005-07-22 devnull eotar(Hdr *hp)
458 031ddeb2 2005-07-22 devnull return name(hp)[0] == '\0';
462 031ddeb2 2005-07-22 devnull hdrsize(Hdr *hp)
464 031ddeb2 2005-07-22 devnull Off bytes = strtoull(hp->size, nil, 8);
466 031ddeb2 2005-07-22 devnull if(isdir(hp))
467 031ddeb2 2005-07-22 devnull bytes = 0;
468 031ddeb2 2005-07-22 devnull return bytes;
471 031ddeb2 2005-07-22 devnull static Hdr *
472 031ddeb2 2005-07-22 devnull readhdr(int ar)
474 031ddeb2 2005-07-22 devnull long hdrcksum;
475 031ddeb2 2005-07-22 devnull Hdr *hp;
477 031ddeb2 2005-07-22 devnull hp = getblkrd(ar, Alldata);
478 031ddeb2 2005-07-22 devnull if (hp == nil)
479 031ddeb2 2005-07-22 devnull sysfatal("unexpected EOF instead of archive header");
480 031ddeb2 2005-07-22 devnull if (eotar(hp)) /* end-of-archive block? */
481 031ddeb2 2005-07-22 devnull return nil;
482 031ddeb2 2005-07-22 devnull hdrcksum = strtoul(hp->chksum, nil, 8);
483 031ddeb2 2005-07-22 devnull if (chksum(hp) != hdrcksum)
484 031ddeb2 2005-07-22 devnull sysfatal("bad archive header checksum: name %.64s...",
485 031ddeb2 2005-07-22 devnull hp->name);
486 031ddeb2 2005-07-22 devnull nexthdr += Tblock*(1 + BYTES2TBLKS(hdrsize(hp)));
487 031ddeb2 2005-07-22 devnull return hp;
491 031ddeb2 2005-07-22 devnull * tar r[c]
495 031ddeb2 2005-07-22 devnull * if name is longer than Namsiz bytes, try to split it at a slash and fit the
496 031ddeb2 2005-07-22 devnull * pieces into hp->prefix and hp->name.
498 031ddeb2 2005-07-22 devnull static int
499 031ddeb2 2005-07-22 devnull putfullname(Hdr *hp, char *name)
501 031ddeb2 2005-07-22 devnull int namlen, pfxlen;
502 031ddeb2 2005-07-22 devnull char *sl, *osl;
503 031ddeb2 2005-07-22 devnull String *slname = nil;
505 031ddeb2 2005-07-22 devnull if (isdir(hp)) {
506 031ddeb2 2005-07-22 devnull slname = s_new();
507 031ddeb2 2005-07-22 devnull s_append(slname, name);
508 031ddeb2 2005-07-22 devnull s_append(slname, "/"); /* posix requires this */
509 031ddeb2 2005-07-22 devnull name = s_to_c(slname);
512 031ddeb2 2005-07-22 devnull namlen = strlen(name);
513 031ddeb2 2005-07-22 devnull if (namlen <= Namsiz) {
514 031ddeb2 2005-07-22 devnull strncpy(hp->name, name, Namsiz);
515 031ddeb2 2005-07-22 devnull hp->prefix[0] = '\0'; /* ustar paranoia */
516 031ddeb2 2005-07-22 devnull return 0;
519 031ddeb2 2005-07-22 devnull if (!posix || namlen > Maxname) {
520 031ddeb2 2005-07-22 devnull fprint(2, "%s: name too long for tar header: %s\n",
521 031ddeb2 2005-07-22 devnull argv0, name);
522 031ddeb2 2005-07-22 devnull return -1;
525 031ddeb2 2005-07-22 devnull * try various splits until one results in pieces that fit into the
526 031ddeb2 2005-07-22 devnull * appropriate fields of the header. look for slashes from right
527 031ddeb2 2005-07-22 devnull * to left, in the hopes of putting the largest part of the name into
528 031ddeb2 2005-07-22 devnull * hp->prefix, which is larger than hp->name.
530 031ddeb2 2005-07-22 devnull sl = strrchr(name, '/');
531 031ddeb2 2005-07-22 devnull while (sl != nil) {
532 031ddeb2 2005-07-22 devnull pfxlen = sl - name;
533 031ddeb2 2005-07-22 devnull if (pfxlen <= sizeof hp->prefix && namlen-1 - pfxlen <= Namsiz)
535 031ddeb2 2005-07-22 devnull osl = sl;
536 031ddeb2 2005-07-22 devnull *osl = '\0';
537 031ddeb2 2005-07-22 devnull sl = strrchr(name, '/');
538 031ddeb2 2005-07-22 devnull *osl = '/';
540 031ddeb2 2005-07-22 devnull if (sl == nil) {
541 031ddeb2 2005-07-22 devnull fprint(2, "%s: name can't be split to fit tar header: %s\n",
542 031ddeb2 2005-07-22 devnull argv0, name);
543 031ddeb2 2005-07-22 devnull return -1;
545 031ddeb2 2005-07-22 devnull *sl = '\0';
546 031ddeb2 2005-07-22 devnull strncpy(hp->prefix, name, sizeof hp->prefix);
547 031ddeb2 2005-07-22 devnull *sl++ = '/';
548 031ddeb2 2005-07-22 devnull strncpy(hp->name, sl, sizeof hp->name);
549 031ddeb2 2005-07-22 devnull if (slname)
550 031ddeb2 2005-07-22 devnull s_free(slname);
551 031ddeb2 2005-07-22 devnull return 0;
554 031ddeb2 2005-07-22 devnull static int
555 031ddeb2 2005-07-22 devnull mkhdr(Hdr *hp, Dir *dir, char *file)
558 031ddeb2 2005-07-22 devnull * these fields run together, so we format them in order and don't use
559 031ddeb2 2005-07-22 devnull * snprint.
561 031ddeb2 2005-07-22 devnull sprint(hp->mode, "%6lo ", dir->mode & 0777);
562 031ddeb2 2005-07-22 devnull sprint(hp->uid, "%6o ", aruid);
563 031ddeb2 2005-07-22 devnull sprint(hp->gid, "%6o ", argid);
565 031ddeb2 2005-07-22 devnull * files > 2 bytes can't be described
566 031ddeb2 2005-07-22 devnull * (unless we resort to xustar or exustar formats).
568 031ddeb2 2005-07-22 devnull if (dir->length >= (Off)1<<33) {
569 031ddeb2 2005-07-22 devnull fprint(2, "%s: %s: too large for tar header format\n",
570 031ddeb2 2005-07-22 devnull argv0, file);
571 031ddeb2 2005-07-22 devnull return -1;
573 031ddeb2 2005-07-22 devnull sprint(hp->size, "%11lluo ", dir->length);
574 031ddeb2 2005-07-22 devnull sprint(hp->mtime, "%11luo ", dir->mtime);
575 031ddeb2 2005-07-22 devnull hp->linkflag = (dir->mode&DMDIR? LF_DIR: LF_PLAIN1);
576 031ddeb2 2005-07-22 devnull putfullname(hp, file);
577 031ddeb2 2005-07-22 devnull if (posix) {
578 031ddeb2 2005-07-22 devnull strncpy(hp->magic, "ustar", sizeof hp->magic);
579 031ddeb2 2005-07-22 devnull strncpy(hp->version, "00", sizeof hp->version);
580 031ddeb2 2005-07-22 devnull strncpy(hp->uname, dir->uid, sizeof hp->uname);
581 031ddeb2 2005-07-22 devnull strncpy(hp->gname, dir->gid, sizeof hp->gname);
583 031ddeb2 2005-07-22 devnull sprint(hp->chksum, "%6luo", chksum(hp));
584 031ddeb2 2005-07-22 devnull return 0;
587 031ddeb2 2005-07-22 devnull static void addtoar(int ar, char *file, char *shortf);
589 031ddeb2 2005-07-22 devnull static void
590 031ddeb2 2005-07-22 devnull addtreetoar(int ar, char *file, char *shortf, int fd)
593 031ddeb2 2005-07-22 devnull Dir *dent, *dirents;
594 031ddeb2 2005-07-22 devnull String *name = s_new();
596 031ddeb2 2005-07-22 devnull n = dirreadall(fd, &dirents);
597 031ddeb2 2005-07-22 devnull close(fd);
598 031ddeb2 2005-07-22 devnull if (n == 0)
601 031ddeb2 2005-07-22 devnull if (chdir(shortf) < 0)
602 031ddeb2 2005-07-22 devnull sysfatal("chdir %s: %r", file);
603 031ddeb2 2005-07-22 devnull if (DEBUG)
604 031ddeb2 2005-07-22 devnull fprint(2, "chdir %s\t# %s\n", shortf, file);
606 031ddeb2 2005-07-22 devnull for (dent = dirents; dent < dirents + n; dent++) {
607 031ddeb2 2005-07-22 devnull s_reset(name);
608 031ddeb2 2005-07-22 devnull s_append(name, file);
609 031ddeb2 2005-07-22 devnull s_append(name, "/");
610 031ddeb2 2005-07-22 devnull s_append(name, dent->name);
611 031ddeb2 2005-07-22 devnull addtoar(ar, s_to_c(name), dent->name);
613 031ddeb2 2005-07-22 devnull s_free(name);
614 031ddeb2 2005-07-22 devnull free(dirents);
617 031ddeb2 2005-07-22 devnull * this assumes that shortf is just one component, which is true
618 031ddeb2 2005-07-22 devnull * during directory descent, but not necessarily true of command-line
619 031ddeb2 2005-07-22 devnull * arguments. Our caller (or addtoar's) must reset the working
620 031ddeb2 2005-07-22 devnull * directory if necessary.
622 031ddeb2 2005-07-22 devnull if (chdir("..") < 0)
623 031ddeb2 2005-07-22 devnull sysfatal("chdir %s/..: %r", file);
624 031ddeb2 2005-07-22 devnull if (DEBUG)
625 031ddeb2 2005-07-22 devnull fprint(2, "chdir ..\n");
628 031ddeb2 2005-07-22 devnull static void
629 031ddeb2 2005-07-22 devnull addtoar(int ar, char *file, char *shortf)
631 031ddeb2 2005-07-22 devnull int n, fd, isdir;
632 031ddeb2 2005-07-22 devnull long bytes;
633 031ddeb2 2005-07-22 devnull ulong blksleft, blksread;
634 031ddeb2 2005-07-22 devnull Hdr *hbp;
635 031ddeb2 2005-07-22 devnull Dir *dir;
637 031ddeb2 2005-07-22 devnull fd = open(shortf, OREAD);
638 031ddeb2 2005-07-22 devnull if (fd < 0) {
639 031ddeb2 2005-07-22 devnull fprint(2, "%s: can't open %s: %r\n", argv0, file);
642 031ddeb2 2005-07-22 devnull dir = dirfstat(fd);
643 031ddeb2 2005-07-22 devnull if (dir == nil)
644 031ddeb2 2005-07-22 devnull sysfatal("can't fstat %s: %r", file);
646 031ddeb2 2005-07-22 devnull hbp = getblkz(ar);
647 031ddeb2 2005-07-22 devnull isdir = !!(dir->qid.type&QTDIR);
648 031ddeb2 2005-07-22 devnull if (mkhdr(hbp, dir, file) < 0) {
649 031ddeb2 2005-07-22 devnull putbackblk(ar);
650 031ddeb2 2005-07-22 devnull free(dir);
651 031ddeb2 2005-07-22 devnull close(fd);
654 031ddeb2 2005-07-22 devnull putblk(ar);
656 031ddeb2 2005-07-22 devnull blksleft = BYTES2TBLKS(dir->length);
657 031ddeb2 2005-07-22 devnull free(dir);
659 031ddeb2 2005-07-22 devnull if (isdir)
660 031ddeb2 2005-07-22 devnull addtreetoar(ar, file, shortf, fd);
662 031ddeb2 2005-07-22 devnull for (; blksleft > 0; blksleft -= blksread) {
663 031ddeb2 2005-07-22 devnull hbp = getblke(ar);
664 031ddeb2 2005-07-22 devnull blksread = gothowmany(blksleft);
665 031ddeb2 2005-07-22 devnull bytes = blksread * Tblock;
666 14f06f67 2005-07-22 devnull n = readn(fd, hbp, bytes);
667 031ddeb2 2005-07-22 devnull if (n < 0)
668 031ddeb2 2005-07-22 devnull sysfatal("error reading %s: %r", file);
670 031ddeb2 2005-07-22 devnull * ignore EOF. zero any partial block to aid
671 031ddeb2 2005-07-22 devnull * compression and emergency recovery of data.
673 031ddeb2 2005-07-22 devnull if (n < Tblock)
674 14f06f67 2005-07-22 devnull memset((uchar*)hbp + n, 0, bytes - n);
675 031ddeb2 2005-07-22 devnull putblkmany(ar, blksread);
677 031ddeb2 2005-07-22 devnull close(fd);
678 031ddeb2 2005-07-22 devnull if (verbose)
679 031ddeb2 2005-07-22 devnull fprint(2, "%s\n", file);
683 031ddeb2 2005-07-22 devnull static char *
684 031ddeb2 2005-07-22 devnull replace(char **argv)
686 031ddeb2 2005-07-22 devnull int i, ar;
687 031ddeb2 2005-07-22 devnull ulong blksleft, blksread;
688 031ddeb2 2005-07-22 devnull Off bytes;
689 031ddeb2 2005-07-22 devnull Hdr *hp;
690 031ddeb2 2005-07-22 devnull Compress *comp = nil;
691 031ddeb2 2005-07-22 devnull Pushstate ps;
693 031ddeb2 2005-07-22 devnull if (usefile && docreate) {
694 031ddeb2 2005-07-22 devnull ar = create(usefile, OWRITE, 0666);
695 031ddeb2 2005-07-22 devnull if (docompress)
696 031ddeb2 2005-07-22 devnull comp = compmethod(usefile);
697 031ddeb2 2005-07-22 devnull } else if (usefile)
698 031ddeb2 2005-07-22 devnull ar = open(usefile, ORDWR);
700 031ddeb2 2005-07-22 devnull ar = Stdout;
701 031ddeb2 2005-07-22 devnull if (comp)
702 031ddeb2 2005-07-22 devnull ar = push(ar, comp->comp, Output, &ps);
703 031ddeb2 2005-07-22 devnull if (ar < 0)
704 031ddeb2 2005-07-22 devnull sysfatal("can't open archive %s: %r", usefile);
706 031ddeb2 2005-07-22 devnull if (usefile && !docreate) {
707 031ddeb2 2005-07-22 devnull /* skip quickly to the end */
708 031ddeb2 2005-07-22 devnull while ((hp = readhdr(ar)) != nil) {
709 031ddeb2 2005-07-22 devnull bytes = hdrsize(hp);
710 031ddeb2 2005-07-22 devnull for (blksleft = BYTES2TBLKS(bytes);
711 031ddeb2 2005-07-22 devnull blksleft > 0 && getblkrd(ar, Justnxthdr) != nil;
712 031ddeb2 2005-07-22 devnull blksleft -= blksread) {
713 031ddeb2 2005-07-22 devnull blksread = gothowmany(blksleft);
714 031ddeb2 2005-07-22 devnull putreadblks(ar, blksread);
718 031ddeb2 2005-07-22 devnull * we have just read the end-of-archive Tblock.
719 031ddeb2 2005-07-22 devnull * now seek back over the (big) archive block containing it,
720 031ddeb2 2005-07-22 devnull * and back up curblk ptr over end-of-archive Tblock in memory.
722 031ddeb2 2005-07-22 devnull if (seek(ar, blkoff, 0) < 0)
723 031ddeb2 2005-07-22 devnull sysfatal("can't seek back over end-of-archive: %r");
724 031ddeb2 2005-07-22 devnull curblk--;
727 031ddeb2 2005-07-22 devnull for (i = 0; argv[i] != nil; i++) {
728 031ddeb2 2005-07-22 devnull addtoar(ar, argv[i], argv[i]);
729 031ddeb2 2005-07-22 devnull chdir(origdir); /* for correctness & profiling */
732 031ddeb2 2005-07-22 devnull /* write end-of-archive marker */
733 031ddeb2 2005-07-22 devnull getblkz(ar);
734 031ddeb2 2005-07-22 devnull putblk(ar);
735 031ddeb2 2005-07-22 devnull getblkz(ar);
736 031ddeb2 2005-07-22 devnull putlastblk(ar);
738 031ddeb2 2005-07-22 devnull if (comp)
739 031ddeb2 2005-07-22 devnull return pushclose(&ps);
740 031ddeb2 2005-07-22 devnull if (ar > Stderr)
741 031ddeb2 2005-07-22 devnull close(ar);
742 031ddeb2 2005-07-22 devnull return nil;
746 031ddeb2 2005-07-22 devnull * tar [xt]
749 031ddeb2 2005-07-22 devnull /* is pfx a file-name prefix of name? */
750 031ddeb2 2005-07-22 devnull static int
751 031ddeb2 2005-07-22 devnull prefix(char *name, char *pfx)
753 031ddeb2 2005-07-22 devnull int pfxlen = strlen(pfx);
754 031ddeb2 2005-07-22 devnull char clpfx[Maxname+1];
756 031ddeb2 2005-07-22 devnull if (pfxlen > Maxname)
757 031ddeb2 2005-07-22 devnull return 0;
758 031ddeb2 2005-07-22 devnull strcpy(clpfx, pfx);
759 031ddeb2 2005-07-22 devnull cleanname(clpfx);
760 031ddeb2 2005-07-22 devnull return strncmp(pfx, name, pfxlen) == 0 &&
761 031ddeb2 2005-07-22 devnull (name[pfxlen] == '\0' || name[pfxlen] == '/');
764 031ddeb2 2005-07-22 devnull static int
765 031ddeb2 2005-07-22 devnull match(char *name, char **argv)
768 031ddeb2 2005-07-22 devnull char clname[Maxname+1];
770 031ddeb2 2005-07-22 devnull if (argv[0] == nil)
771 031ddeb2 2005-07-22 devnull return 1;
772 031ddeb2 2005-07-22 devnull strcpy(clname, name);
773 031ddeb2 2005-07-22 devnull cleanname(clname);
774 031ddeb2 2005-07-22 devnull for (i = 0; argv[i] != nil; i++)
775 031ddeb2 2005-07-22 devnull if (prefix(clname, argv[i]))
776 031ddeb2 2005-07-22 devnull return 1;
777 031ddeb2 2005-07-22 devnull return 0;
780 031ddeb2 2005-07-22 devnull static int
781 031ddeb2 2005-07-22 devnull makedir(char *s)
785 031ddeb2 2005-07-22 devnull if (access(s, AEXIST) == 0)
786 031ddeb2 2005-07-22 devnull return -1;
787 031ddeb2 2005-07-22 devnull f = create(s, OREAD, DMDIR | 0777);
788 031ddeb2 2005-07-22 devnull if (f >= 0)
789 031ddeb2 2005-07-22 devnull close(f);
790 031ddeb2 2005-07-22 devnull return f;
793 031ddeb2 2005-07-22 devnull static void
794 031ddeb2 2005-07-22 devnull mkpdirs(char *s)
796 031ddeb2 2005-07-22 devnull int done = 0;
797 031ddeb2 2005-07-22 devnull char *p = s;
799 031ddeb2 2005-07-22 devnull while (!done && (p = strchr(p + 1, '/')) != nil) {
800 031ddeb2 2005-07-22 devnull *p = '\0';
801 031ddeb2 2005-07-22 devnull done = (access(s, AEXIST) < 0 && makedir(s) < 0);
802 031ddeb2 2005-07-22 devnull *p = '/';
806 031ddeb2 2005-07-22 devnull /* copy a file from the archive into the filesystem */
807 031ddeb2 2005-07-22 devnull /* fname is result of name(), so has two extra bytes at beginning */
808 031ddeb2 2005-07-22 devnull static void
809 031ddeb2 2005-07-22 devnull extract1(int ar, Hdr *hp, char *fname)
811 031ddeb2 2005-07-22 devnull int wrbytes, fd = -1, dir = 0;
812 031ddeb2 2005-07-22 devnull long mtime = strtol(hp->mtime, nil, 8);
813 031ddeb2 2005-07-22 devnull ulong mode = strtoul(hp->mode, nil, 8) & 0777;
814 031ddeb2 2005-07-22 devnull Off bytes = strtoll(hp->size, nil, 8); /* for printing */
815 031ddeb2 2005-07-22 devnull ulong blksread, blksleft = BYTES2TBLKS(hdrsize(hp));
816 031ddeb2 2005-07-22 devnull Hdr *hbp;
818 031ddeb2 2005-07-22 devnull if (isdir(hp)) {
819 031ddeb2 2005-07-22 devnull mode |= DMDIR|0700;
820 031ddeb2 2005-07-22 devnull dir = 1;
822 031ddeb2 2005-07-22 devnull switch (hp->linkflag) {
823 031ddeb2 2005-07-22 devnull case LF_LINK:
824 031ddeb2 2005-07-22 devnull case LF_SYMLINK1:
825 031ddeb2 2005-07-22 devnull case LF_SYMLINK2:
826 031ddeb2 2005-07-22 devnull case LF_FIFO:
827 031ddeb2 2005-07-22 devnull blksleft = 0;
830 031ddeb2 2005-07-22 devnull if (relative) {
831 031ddeb2 2005-07-22 devnull if(fname[0] == '/')
832 031ddeb2 2005-07-22 devnull *--fname = '.';
833 031ddeb2 2005-07-22 devnull else if(fname[0] == '#'){
834 031ddeb2 2005-07-22 devnull *--fname = '/';
835 031ddeb2 2005-07-22 devnull *--fname = '.';
838 031ddeb2 2005-07-22 devnull if (verb == Xtract) {
839 031ddeb2 2005-07-22 devnull cleanname(fname);
840 031ddeb2 2005-07-22 devnull switch (hp->linkflag) {
841 031ddeb2 2005-07-22 devnull case LF_LINK:
842 031ddeb2 2005-07-22 devnull case LF_SYMLINK1:
843 031ddeb2 2005-07-22 devnull case LF_SYMLINK2:
844 031ddeb2 2005-07-22 devnull fprint(2, "%s: can't make (sym)link %s\n",
845 031ddeb2 2005-07-22 devnull argv0, fname);
847 031ddeb2 2005-07-22 devnull case LF_FIFO:
848 031ddeb2 2005-07-22 devnull fprint(2, "%s: can't make fifo %s\n", argv0, fname);
850 031ddeb2 2005-07-22 devnull default:
851 031ddeb2 2005-07-22 devnull if (!keepexisting || access(fname, AEXIST) < 0) {
852 031ddeb2 2005-07-22 devnull int rw = (dir? OREAD: OWRITE);
854 031ddeb2 2005-07-22 devnull fd = create(fname, rw, mode);
855 031ddeb2 2005-07-22 devnull if (fd < 0) {
856 031ddeb2 2005-07-22 devnull mkpdirs(fname);
857 031ddeb2 2005-07-22 devnull fd = create(fname, rw, mode);
859 031ddeb2 2005-07-22 devnull if (fd < 0 &&
860 031ddeb2 2005-07-22 devnull (!dir || access(fname, AEXIST) < 0))
861 031ddeb2 2005-07-22 devnull fprint(2, "%s: can't create %s: %r\n",
862 031ddeb2 2005-07-22 devnull argv0, fname);
864 031ddeb2 2005-07-22 devnull if (fd >= 0 && verbose)
865 031ddeb2 2005-07-22 devnull fprint(2, "%s\n", fname);
868 031ddeb2 2005-07-22 devnull } else if (verbose) {
869 031ddeb2 2005-07-22 devnull char *cp = ctime(mtime);
871 031ddeb2 2005-07-22 devnull print("%M %8lld %-12.12s %-4.4s %s\n",
872 031ddeb2 2005-07-22 devnull mode, bytes, cp+4, cp+24, fname);
874 031ddeb2 2005-07-22 devnull print("%s\n", fname);
876 031ddeb2 2005-07-22 devnull for (; blksleft > 0; blksleft -= blksread) {
877 031ddeb2 2005-07-22 devnull hbp = getblkrd(ar, (fd >= 0? Alldata: Justnxthdr));
878 031ddeb2 2005-07-22 devnull if (hbp == nil)
879 031ddeb2 2005-07-22 devnull sysfatal("unexpected EOF on archive extracting %s",
881 031ddeb2 2005-07-22 devnull blksread = gothowmany(blksleft);
882 031ddeb2 2005-07-22 devnull wrbytes = Tblock*blksread;
883 031ddeb2 2005-07-22 devnull if(wrbytes > bytes)
884 031ddeb2 2005-07-22 devnull wrbytes = bytes;
885 14f06f67 2005-07-22 devnull if (fd >= 0 && write(fd, hbp, wrbytes) != wrbytes)
886 031ddeb2 2005-07-22 devnull sysfatal("write error on %s: %r", fname);
887 031ddeb2 2005-07-22 devnull putreadblks(ar, blksread);
888 031ddeb2 2005-07-22 devnull bytes -= wrbytes;
890 031ddeb2 2005-07-22 devnull if (fd >= 0) {
892 031ddeb2 2005-07-22 devnull * directories should be wstated after we're done
893 031ddeb2 2005-07-22 devnull * creating files in them.
895 031ddeb2 2005-07-22 devnull if (settime) {
898 031ddeb2 2005-07-22 devnull nulldir(&nd);
899 031ddeb2 2005-07-22 devnull nd.mtime = mtime;
900 031ddeb2 2005-07-22 devnull if (isustar(hp))
901 031ddeb2 2005-07-22 devnull nd.gid = hp->gname;
902 031ddeb2 2005-07-22 devnull dirfwstat(fd, &nd);
904 031ddeb2 2005-07-22 devnull close(fd);
908 031ddeb2 2005-07-22 devnull static void
909 031ddeb2 2005-07-22 devnull skip(int ar, Hdr *hp, char *fname)
911 031ddeb2 2005-07-22 devnull ulong blksleft, blksread;
912 031ddeb2 2005-07-22 devnull Hdr *hbp;
914 031ddeb2 2005-07-22 devnull for (blksleft = BYTES2TBLKS(hdrsize(hp)); blksleft > 0;
915 031ddeb2 2005-07-22 devnull blksleft -= blksread) {
916 031ddeb2 2005-07-22 devnull hbp = getblkrd(ar, Justnxthdr);
917 031ddeb2 2005-07-22 devnull if (hbp == nil)
918 031ddeb2 2005-07-22 devnull sysfatal("unexpected EOF on archive extracting %s",
920 031ddeb2 2005-07-22 devnull blksread = gothowmany(blksleft);
921 031ddeb2 2005-07-22 devnull putreadblks(ar, blksread);
925 031ddeb2 2005-07-22 devnull static char *
926 031ddeb2 2005-07-22 devnull extract(char **argv)
929 031ddeb2 2005-07-22 devnull char *longname;
930 031ddeb2 2005-07-22 devnull Hdr *hp;
931 031ddeb2 2005-07-22 devnull Compress *comp = nil;
932 031ddeb2 2005-07-22 devnull Pushstate ps;
934 031ddeb2 2005-07-22 devnull if (usefile) {
935 031ddeb2 2005-07-22 devnull ar = open(usefile, OREAD);
936 031ddeb2 2005-07-22 devnull comp = compmethod(usefile);
938 031ddeb2 2005-07-22 devnull ar = Stdin;
939 031ddeb2 2005-07-22 devnull if (comp)
940 031ddeb2 2005-07-22 devnull ar = push(ar, comp->decomp, Input, &ps);
941 031ddeb2 2005-07-22 devnull if (ar < 0)
942 031ddeb2 2005-07-22 devnull sysfatal("can't open archive %s: %r", usefile);
944 031ddeb2 2005-07-22 devnull while ((hp = readhdr(ar)) != nil) {
945 031ddeb2 2005-07-22 devnull longname = name(hp);
946 031ddeb2 2005-07-22 devnull if (match(longname, argv))
947 031ddeb2 2005-07-22 devnull extract1(ar, hp, longname);
949 031ddeb2 2005-07-22 devnull skip(ar, hp, longname);
952 031ddeb2 2005-07-22 devnull if (comp)
953 031ddeb2 2005-07-22 devnull return pushclose(&ps);
954 031ddeb2 2005-07-22 devnull if (ar > Stderr)
955 031ddeb2 2005-07-22 devnull close(ar);
956 031ddeb2 2005-07-22 devnull return nil;
960 031ddeb2 2005-07-22 devnull main(int argc, char *argv[])
962 031ddeb2 2005-07-22 devnull int errflg = 0;
963 031ddeb2 2005-07-22 devnull char *ret = nil;
965 031ddeb2 2005-07-22 devnull quotefmtinstall();
966 031ddeb2 2005-07-22 devnull fmtinstall('M', dirmodefmt);
968 031ddeb2 2005-07-22 devnull TARGBEGIN {
969 031ddeb2 2005-07-22 devnull case 'c':
970 031ddeb2 2005-07-22 devnull docreate++;
971 031ddeb2 2005-07-22 devnull verb = Replace;
973 031ddeb2 2005-07-22 devnull case 'f':
974 031ddeb2 2005-07-22 devnull usefile = EARGF(usage());
976 031ddeb2 2005-07-22 devnull case 'g':
977 031ddeb2 2005-07-22 devnull argid = strtoul(EARGF(usage()), 0, 0);
979 031ddeb2 2005-07-22 devnull case 'k':
980 031ddeb2 2005-07-22 devnull keepexisting++;
982 031ddeb2 2005-07-22 devnull case 'm': /* compatibility */
983 031ddeb2 2005-07-22 devnull settime = 0;
985 031ddeb2 2005-07-22 devnull case 'p':
986 031ddeb2 2005-07-22 devnull posix++;
988 031ddeb2 2005-07-22 devnull case 'P':
989 031ddeb2 2005-07-22 devnull posix = 0;
991 031ddeb2 2005-07-22 devnull case 'r':
992 031ddeb2 2005-07-22 devnull verb = Replace;
994 031ddeb2 2005-07-22 devnull case 'R':
995 031ddeb2 2005-07-22 devnull relative = 0;
997 031ddeb2 2005-07-22 devnull case 't':
998 031ddeb2 2005-07-22 devnull verb = Toc;
1000 031ddeb2 2005-07-22 devnull case 'T':
1001 031ddeb2 2005-07-22 devnull settime++;
1003 031ddeb2 2005-07-22 devnull case 'u':
1004 031ddeb2 2005-07-22 devnull aruid = strtoul(EARGF(usage()), 0, 0);
1006 031ddeb2 2005-07-22 devnull case 'v':
1007 031ddeb2 2005-07-22 devnull verbose++;
1009 031ddeb2 2005-07-22 devnull case 'x':
1010 031ddeb2 2005-07-22 devnull verb = Xtract;
1012 031ddeb2 2005-07-22 devnull case 'z':
1013 031ddeb2 2005-07-22 devnull docompress++;
1015 031ddeb2 2005-07-22 devnull case '-':
1017 031ddeb2 2005-07-22 devnull default:
1018 031ddeb2 2005-07-22 devnull fprint(2, "tar: unknown letter %C\n", TARGC());
1019 031ddeb2 2005-07-22 devnull errflg++;
1021 031ddeb2 2005-07-22 devnull } TARGEND
1023 031ddeb2 2005-07-22 devnull if (argc < 0 || errflg)
1024 031ddeb2 2005-07-22 devnull usage();
1026 031ddeb2 2005-07-22 devnull initblks();
1027 031ddeb2 2005-07-22 devnull switch (verb) {
1028 031ddeb2 2005-07-22 devnull case Toc:
1029 031ddeb2 2005-07-22 devnull case Xtract:
1030 031ddeb2 2005-07-22 devnull ret = extract(argv);
1032 031ddeb2 2005-07-22 devnull case Replace:
1033 031ddeb2 2005-07-22 devnull if (getwd(origdir, sizeof origdir) == nil)
1034 031ddeb2 2005-07-22 devnull strcpy(origdir, "/tmp");
1035 031ddeb2 2005-07-22 devnull ret = replace(argv);
1037 031ddeb2 2005-07-22 devnull default:
1038 031ddeb2 2005-07-22 devnull usage();
1041 031ddeb2 2005-07-22 devnull exits(ret);