remove old tar
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rsc
parent
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1d620367bd
1 changed files with 0 additions and 859 deletions
859
src/cmd/tar.C
859
src/cmd/tar.C
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@ -1,859 +0,0 @@
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/*
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* tar - `tape archiver', actually usable on any medium.
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* POSIX "ustar" compliant when extracting, and by default when creating.
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* this tar attempts to read and write multiple Tblock-byte blocks
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* at once to and from the filesystem, and does not copy blocks
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* around internally.
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*/
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#include <u.h>
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#include <libc.h>
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#include <fcall.h> /* for %M */
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#include <libString.h>
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#define creat tar_creat
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/*
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* modified versions of those in libc.h; scans only the first arg for
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* keyletters and options.
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*/
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#define TARGBEGIN {\
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__fixargv0(); if(!argv0) argv0=*argv; \
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argv++, argc--; \
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if (argv[0]) {\
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char *_args, *_argt;\
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Rune _argc;\
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_args = &argv[0][0];\
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_argc = 0;\
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while(*_args && (_args += chartorune(&_argc, _args)))\
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switch(_argc)
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#define TARGEND SET(_argt); USED(_argt); USED(_argc); USED(_args); argc--, argv++; } \
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USED(argv);USED(argc); }
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#define ROUNDUP(a, b) (((a) + (b) - 1)/(b))
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#define BYTES2TBLKS(bytes) ROUNDUP(bytes, Tblock)
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typedef vlong Off;
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typedef char *(*Refill)(int ar, char *bufs);
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enum { Stdin, Stdout, Stderr };
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enum { None, Toc, Xtract, Replace };
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enum {
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Tblock = 512,
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Nblock = 40, /* maximum blocksize */
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Dblock = 20, /* default blocksize */
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Namsiz = 100,
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Maxpfx = 155, /* from POSIX */
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Maxname = Namsiz + 1 + Maxpfx,
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DEBUG = 0,
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};
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/* POSIX link flags */
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enum {
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LF_PLAIN1 = '\0',
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LF_PLAIN2 = '0',
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LF_LINK = '1',
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LF_SYMLINK1 = '2',
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LF_SYMLINK2 = 's',
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LF_CHR = '3',
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LF_BLK = '4',
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LF_DIR = '5',
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LF_FIFO = '6',
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LF_CONTIG = '7',
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/* 'A' - 'Z' are reserved for custom implementations */
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};
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#define islink(lf) (isreallink(lf) || issymlink(lf))
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#define isreallink(lf) ((lf) == LF_LINK)
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#define issymlink(lf) ((lf) == LF_SYMLINK1 || (lf) == LF_SYMLINK2)
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typedef union {
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char name[Namsiz];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char linkflag;
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char linkname[Namsiz];
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/* rest are defined by POSIX's ustar format; see p1003.2b */
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char magic[6]; /* "ustar" */
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char version[2];
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char uname[32];
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char gname[32];
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char devmajor[8];
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char devminor[8];
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char prefix[Maxpfx]; /* if non-null, path= prefix "/" name */
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} Hdr;
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int debug;
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static int verb;
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static int posix = 1;
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static int creat;
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static int aruid;
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static int argid;
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static int relative;
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static int settime;
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static int verbose;
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static int nblock = Dblock;
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static char *usefile;
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static char origdir[Maxname*2];
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static Hdr *tpblk, *endblk;
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static Hdr *curblk;
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static void
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usage(void)
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{
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fprint(2, "usage: %s {txrc}[pPvRTugf] [archive] file1 file2...\n",
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argv0);
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exits("usage");
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}
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/*
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* block-buffer management
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*/
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static void
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initblks(void)
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{
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free(tpblk);
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tpblk = malloc(Tblock * nblock);
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assert(tpblk != nil);
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endblk = tpblk + nblock;
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}
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static char *
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refill(int ar, char *bufs)
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{
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int i, n;
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unsigned bytes = Tblock * nblock;
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static int done, first = 1;
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if (done)
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return nil;
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/* try to size non-pipe input at first read */
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if (first && usefile) {
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first = 0;
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n = read(ar, bufs, bytes);
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if (n <= 0)
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sysfatal("error reading archive: %r");
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i = n;
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if (i % Tblock != 0) {
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fprint(2, "%s: archive block size (%d) error\n",
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argv0, i);
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exits("blocksize");
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}
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i /= Tblock;
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if (i != nblock) {
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nblock = i;
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fprint(2, "%s: blocking = %d\n", argv0, nblock);
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endblk = (Hdr *)bufs + nblock;
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bytes = n;
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}
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} else
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n = readn(ar, bufs, bytes);
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if (n == 0)
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sysfatal("unexpected EOF reading archive");
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else if (n < 0)
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sysfatal("error reading archive: %r");
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else if (n%Tblock != 0)
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sysfatal("partial block read from archive");
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if (n != bytes) {
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done = 1;
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memset(bufs + n, 0, bytes - n);
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}
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return bufs;
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}
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static Hdr *
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getblk(int ar, Refill rfp)
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{
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if (curblk == nil || curblk >= endblk) { /* input block exhausted? */
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if (rfp != nil && (*rfp)(ar, (char *)tpblk) == nil)
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return nil;
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curblk = tpblk;
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}
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return curblk++;
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}
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static Hdr *
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getblkrd(int ar)
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{
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return getblk(ar, refill);
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}
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static Hdr *
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getblke(int ar)
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{
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return getblk(ar, nil);
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}
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static Hdr *
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getblkz(int ar)
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{
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Hdr *hp = getblke(ar);
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if (hp != nil)
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memset(hp, 0, Tblock);
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return hp;
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}
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/*
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* how many block buffers are available, starting at the address
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* just returned by getblk*?
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*/
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static int
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gothowmany(int max)
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{
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int n = endblk - (curblk - 1);
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return n > max? max: n;
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}
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/*
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* indicate that one is done with the last block obtained from getblke
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* and it is now available to be written into the archive.
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*/
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static void
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putlastblk(int ar)
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{
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unsigned bytes = Tblock * nblock;
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/* if writing end-of-archive, aid compression (good hygiene too) */
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if (curblk < endblk)
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memset(curblk, 0, (char *)endblk - (char *)curblk);
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if (write(ar, tpblk, bytes) != bytes)
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sysfatal("error writing archive: %r");
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}
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static void
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putblk(int ar)
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{
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if (curblk >= endblk)
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putlastblk(ar);
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}
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static void
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putbackblk(int ar)
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{
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curblk--;
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USED(ar);
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}
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static void
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putreadblks(int ar, int blks)
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{
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curblk += blks - 1;
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USED(ar);
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}
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static void
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putblkmany(int ar, int blks)
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{
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curblk += blks - 1;
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putblk(ar);
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}
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/*
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* common routines
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*/
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/* modifies hp->chksum */
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long
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chksum(Hdr *hp)
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{
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int n = Tblock;
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long i = 0;
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uchar *cp = (uchar*)hp;
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memset(hp->chksum, ' ', sizeof hp->chksum);
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while (n-- > 0)
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i += *cp++;
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return i;
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}
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static int
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isustar(Hdr *hp)
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{
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return strcmp(hp->magic, "ustar") == 0;
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}
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/*
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* s is at most n bytes long, but need not be NUL-terminated.
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* if shorter than n bytes, all bytes after the first NUL must also
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* be NUL.
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*/
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static int
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strnlen(char *s, int n)
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{
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return s[n - 1] != '\0'? n: strlen(s);
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}
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/* set fullname from header */
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static char *
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name(Hdr *hp)
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{
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int pfxlen, namlen;
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static char fullname[Maxname + 1];
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namlen = strnlen(hp->name, sizeof hp->name);
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if (hp->prefix[0] == '\0' || !isustar(hp)) { /* old-style name? */
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memmove(fullname, hp->name, namlen);
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fullname[namlen] = '\0';
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return fullname;
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}
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/* name is in two pieces */
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pfxlen = strnlen(hp->prefix, sizeof hp->prefix);
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memmove(fullname, hp->prefix, pfxlen);
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fullname[pfxlen] = '/';
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memmove(fullname + pfxlen + 1, hp->name, namlen);
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fullname[pfxlen + 1 + namlen] = '\0';
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return fullname;
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}
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static int
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isdir(Hdr *hp)
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{
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/* the mode test is ugly but sometimes necessary */
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return hp->linkflag == LF_DIR ||
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strrchr(name(hp), '\0')[-1] == '/' ||
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(strtoul(hp->mode, nil, 8)&0170000) == 040000;
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}
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static int
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eotar(Hdr *hp)
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{
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return name(hp)[0] == '\0';
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}
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static Hdr *
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readhdr(int ar)
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{
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long hdrcksum;
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Hdr *hp;
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hp = getblkrd(ar);
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if (hp == nil)
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sysfatal("unexpected EOF instead of archive header");
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if (eotar(hp)) /* end-of-archive block? */
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return nil;
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hdrcksum = strtoul(hp->chksum, nil, 8);
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if (chksum(hp) != hdrcksum)
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sysfatal("bad archive header checksum: name %.64s...",
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hp->name);
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return hp;
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}
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/*
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* tar r[c]
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*/
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/*
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* if name is longer than Namsiz bytes, try to split it at a slash and fit the
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* pieces into hp->prefix and hp->name.
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*/
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static int
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putfullname(Hdr *hp, char *name)
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{
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int namlen, pfxlen;
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char *sl, *osl;
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String *slname = nil;
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if (isdir(hp)) {
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slname = s_new();
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s_append(slname, name);
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s_append(slname, "/"); /* posix requires this */
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name = s_to_c(slname);
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}
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namlen = strlen(name);
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if (namlen <= Namsiz) {
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strncpy(hp->name, name, Namsiz);
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hp->prefix[0] = '\0'; /* ustar paranoia */
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return 0;
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}
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if (!posix || namlen > Maxname) {
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fprint(2, "%s: name too long for tar header: %s\n",
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argv0, name);
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return -1;
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}
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/*
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* try various splits until one results in pieces that fit into the
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* appropriate fields of the header. look for slashes from right
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* to left, in the hopes of putting the largest part of the name into
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* hp->prefix, which is larger than hp->name.
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*/
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sl = strrchr(name, '/');
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while (sl != nil) {
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pfxlen = sl - name;
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if (pfxlen <= sizeof hp->prefix && namlen-1 - pfxlen <= Namsiz)
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break;
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osl = sl;
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*osl = '\0';
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sl = strrchr(name, '/');
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*osl = '/';
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}
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if (sl == nil) {
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fprint(2, "%s: name can't be split to fit tar header: %s\n",
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argv0, name);
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return -1;
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}
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*sl = '\0';
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strncpy(hp->prefix, name, sizeof hp->prefix);
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*sl++ = '/';
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strncpy(hp->name, sl, sizeof hp->name);
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if (slname)
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s_free(slname);
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return 0;
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}
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static int
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mkhdr(Hdr *hp, Dir *dir, char *file)
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{
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/*
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* these fields run together, so we format them in order and don't use
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* snprint.
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*/
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sprint(hp->mode, "%6lo ", dir->mode & 0777);
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sprint(hp->uid, "%6o ", aruid);
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sprint(hp->gid, "%6o ", argid);
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/*
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* files > 2 bytes can't be described
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* (unless we resort to xustar or exustar formats).
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*/
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if (dir->length >= (Off)1<<33) {
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fprint(2, "%s: %s: too large for tar header format\n",
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argv0, file);
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return -1;
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}
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sprint(hp->size, "%11lluo ", dir->length);
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sprint(hp->mtime, "%11luo ", dir->mtime);
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hp->linkflag = (dir->mode&DMDIR? LF_DIR: LF_PLAIN1);
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putfullname(hp, file);
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if (posix) {
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strncpy(hp->magic, "ustar", sizeof hp->magic);
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strncpy(hp->version, "00", sizeof hp->version);
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strncpy(hp->uname, dir->uid, sizeof hp->uname);
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strncpy(hp->gname, dir->gid, sizeof hp->gname);
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}
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sprint(hp->chksum, "%6luo", chksum(hp));
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return 0;
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}
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static void addtoar(int ar, char *file, char *shortf);
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static void
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addtreetoar(int ar, char *file, char *shortf, int fd)
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{
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int n;
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Dir *dent, *dirents;
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String *name = s_new();
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n = dirreadall(fd, &dirents);
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close(fd);
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if (n == 0)
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return;
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if (chdir(shortf) < 0)
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sysfatal("chdir %s: %r", file);
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if (DEBUG)
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fprint(2, "chdir %s\t# %s\n", shortf, file);
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for (dent = dirents; dent < dirents + n; dent++) {
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s_reset(name);
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s_append(name, file);
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s_append(name, "/");
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s_append(name, dent->name);
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addtoar(ar, s_to_c(name), dent->name);
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}
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s_free(name);
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free(dirents);
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if (chdir("..") < 0)
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sysfatal("chdir %s: %r", file);
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if (DEBUG)
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fprint(2, "chdir ..\n");
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}
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static void
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addtoar(int ar, char *file, char *shortf)
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{
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int n, fd, isdir, r;
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long bytes;
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ulong blksleft, blksread;
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Hdr *hbp;
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Dir *dir;
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fd = open(shortf, OREAD);
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if (fd < 0) {
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fprint(2, "%s: can't open %s: %r\n", argv0, file);
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return;
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}
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dir = dirfstat(fd);
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if (dir == nil)
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sysfatal("can't fstat %s: %r", file);
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hbp = getblkz(ar);
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isdir = !!(dir->qid.type&QTDIR);
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r = mkhdr(hbp, dir, file);
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if (r < 0) {
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putbackblk(ar);
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free(dir);
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close(fd);
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return;
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}
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putblk(ar);
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blksleft = BYTES2TBLKS(dir->length);
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free(dir);
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if (isdir)
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addtreetoar(ar, file, shortf, fd);
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else {
|
||||
for (; blksleft > 0; blksleft -= blksread) {
|
||||
hbp = getblke(ar);
|
||||
blksread = gothowmany(blksleft);
|
||||
bytes = blksread * Tblock;
|
||||
n = read(fd, hbp, bytes);
|
||||
if (n < 0)
|
||||
sysfatal("error reading %s: %r", file);
|
||||
/*
|
||||
* ignore EOF. zero any partial block to aid
|
||||
* compression and emergency recovery of data.
|
||||
*/
|
||||
if (n < Tblock)
|
||||
memset((char*)hbp + n, 0, bytes - n);
|
||||
putblkmany(ar, blksread);
|
||||
}
|
||||
close(fd);
|
||||
if (verbose)
|
||||
fprint(2, "%s: a %s\n", argv0, file);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
replace(char **argv)
|
||||
{
|
||||
int i, ar;
|
||||
ulong blksleft, blksread;
|
||||
Off bytes;
|
||||
Hdr *hp;
|
||||
|
||||
if (usefile && creat)
|
||||
ar = create(usefile, ORDWR, 0666);
|
||||
else if (usefile)
|
||||
ar = open(usefile, ORDWR);
|
||||
else
|
||||
ar = Stdout;
|
||||
if (ar < 0)
|
||||
sysfatal("can't open archive %s: %r", usefile);
|
||||
|
||||
if (usefile && !creat) {
|
||||
/* skip quickly to the end */
|
||||
while ((hp = readhdr(ar)) != nil) {
|
||||
bytes = (isdir(hp)? 0: strtoull(hp->size, nil, 8));
|
||||
for (blksleft = BYTES2TBLKS(bytes);
|
||||
blksleft > 0 && getblkrd(ar) != nil;
|
||||
blksleft -= blksread) {
|
||||
blksread = gothowmany(blksleft);
|
||||
putreadblks(ar, blksread);
|
||||
}
|
||||
}
|
||||
/*
|
||||
* we have just read the end-of-archive Tblock.
|
||||
* now seek back over the (big) archive block containing it,
|
||||
* and back up curblk ptr over end-of-archive Tblock in memory.
|
||||
*/
|
||||
if (seek(ar, -Tblock*nblock, 1) < 0)
|
||||
sysfatal("can't seek back over end-of-archive: %r");
|
||||
curblk--;
|
||||
}
|
||||
|
||||
for (i = 0; argv[i] != nil; i++)
|
||||
addtoar(ar, argv[i], argv[i]);
|
||||
|
||||
/* write end-of-archive marker */
|
||||
getblkz(ar);
|
||||
putblk(ar);
|
||||
getblkz(ar);
|
||||
putlastblk(ar);
|
||||
|
||||
if (ar > Stderr)
|
||||
close(ar);
|
||||
}
|
||||
|
||||
/*
|
||||
* tar [xt]
|
||||
*/
|
||||
|
||||
/* is pfx a file-name prefix of name? */
|
||||
static int
|
||||
prefix(char *name, char *pfx)
|
||||
{
|
||||
int pfxlen = strlen(pfx);
|
||||
char clpfx[Maxname+1];
|
||||
|
||||
if (pfxlen > Maxname)
|
||||
return 0;
|
||||
strcpy(clpfx, pfx);
|
||||
cleanname(clpfx);
|
||||
return strncmp(pfx, name, pfxlen) == 0 &&
|
||||
(name[pfxlen] == '\0' || name[pfxlen] == '/');
|
||||
}
|
||||
|
||||
static int
|
||||
match(char *name, char **argv)
|
||||
{
|
||||
int i;
|
||||
char clname[Maxname+1];
|
||||
|
||||
if (argv[0] == nil)
|
||||
return 1;
|
||||
strcpy(clname, name);
|
||||
cleanname(clname);
|
||||
for (i = 0; argv[i] != nil; i++)
|
||||
if (prefix(clname, argv[i]))
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
makedir(char *s)
|
||||
{
|
||||
int f;
|
||||
|
||||
if (access(s, AEXIST) == 0)
|
||||
return -1;
|
||||
f = create(s, OREAD, DMDIR | 0777);
|
||||
if (f >= 0)
|
||||
close(f);
|
||||
return f;
|
||||
}
|
||||
|
||||
static void
|
||||
mkpdirs(char *s)
|
||||
{
|
||||
int done = 0;
|
||||
char *p = s;
|
||||
|
||||
while (!done && (p = strchr(p + 1, '/')) != nil) {
|
||||
*p = '\0';
|
||||
done = (access(s, AEXIST) < 0 && makedir(s) < 0);
|
||||
*p = '/';
|
||||
}
|
||||
}
|
||||
|
||||
/* copy a file from the archive into the filesystem */
|
||||
static void
|
||||
extract1(int ar, Hdr *hp, char *fname)
|
||||
{
|
||||
int wrbytes, fd = -1, dir = 0, okcreate = 1;
|
||||
long mtime = strtol(hp->mtime, nil, 8);
|
||||
ulong mode = strtoul(hp->mode, nil, 8) & 0777;
|
||||
Off bytes = strtoll(hp->size, nil, 8);
|
||||
ulong blksread, blksleft = BYTES2TBLKS(bytes);
|
||||
Hdr *hbp;
|
||||
|
||||
if (isdir(hp)) {
|
||||
mode |= DMDIR|0700;
|
||||
blksleft = 0;
|
||||
dir = 1;
|
||||
}
|
||||
switch (hp->linkflag) {
|
||||
case LF_LINK:
|
||||
case LF_SYMLINK1:
|
||||
case LF_SYMLINK2:
|
||||
case LF_FIFO:
|
||||
blksleft = okcreate = 0;
|
||||
break;
|
||||
}
|
||||
if (relative && fname[0] == '/')
|
||||
fname++;
|
||||
if (verb == Xtract) {
|
||||
cleanname(fname);
|
||||
switch (hp->linkflag) {
|
||||
case LF_LINK:
|
||||
case LF_SYMLINK1:
|
||||
case LF_SYMLINK2:
|
||||
fprint(2, "%s: can't make (sym)link %s\n",
|
||||
argv0, fname);
|
||||
break;
|
||||
case LF_FIFO:
|
||||
fprint(2, "%s: can't make fifo %s\n", argv0, fname);
|
||||
break;
|
||||
}
|
||||
if (okcreate)
|
||||
fd = create(fname, (dir? OREAD: OWRITE), mode);
|
||||
if (fd < 0) {
|
||||
mkpdirs(fname);
|
||||
fd = create(fname, (dir? OREAD: OWRITE), mode);
|
||||
if (fd < 0 && (!dir || access(fname, AEXIST) < 0))
|
||||
fprint(2, "%s: can't create %s: %r\n",
|
||||
argv0, fname);
|
||||
}
|
||||
if (fd >= 0 && verbose)
|
||||
fprint(2, "%s: x %s\n", argv0, fname);
|
||||
} else if (verbose) {
|
||||
char *cp = ctime(mtime);
|
||||
|
||||
print("%M %8lld %-12.12s %-4.4s %s\n",
|
||||
mode, bytes, cp+4, cp+24, fname);
|
||||
} else
|
||||
print("%s\n", fname);
|
||||
|
||||
for (; blksleft > 0; blksleft -= blksread) {
|
||||
hbp = getblkrd(ar);
|
||||
if (hbp == nil)
|
||||
sysfatal("unexpected EOF on archive extracting %s",
|
||||
fname);
|
||||
blksread = gothowmany(blksleft);
|
||||
wrbytes = (bytes >= Tblock*blksread? Tblock*blksread: bytes);
|
||||
if (fd >= 0 && write(fd, (char*)hbp, wrbytes) != wrbytes)
|
||||
sysfatal("write error on %s: %r", fname);
|
||||
putreadblks(ar, blksread);
|
||||
bytes -= wrbytes;
|
||||
}
|
||||
if (fd >= 0) {
|
||||
/*
|
||||
* directories should be wstated after we're done
|
||||
* creating files in them.
|
||||
*/
|
||||
if (settime) {
|
||||
Dir nd;
|
||||
|
||||
nulldir(&nd);
|
||||
nd.mtime = mtime;
|
||||
if (isustar(hp))
|
||||
nd.gid = hp->gname;
|
||||
dirfwstat(fd, &nd);
|
||||
}
|
||||
close(fd);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
skip(int ar, Hdr *hp, char *fname)
|
||||
{
|
||||
Off bytes;
|
||||
ulong blksleft, blksread;
|
||||
Hdr *hbp;
|
||||
|
||||
if (isdir(hp))
|
||||
return;
|
||||
bytes = strtoull(hp->size, nil, 8);
|
||||
blksleft = BYTES2TBLKS(bytes);
|
||||
for (; blksleft > 0; blksleft -= blksread) {
|
||||
hbp = getblkrd(ar);
|
||||
if (hbp == nil)
|
||||
sysfatal("unexpected EOF on archive extracting %s",
|
||||
fname);
|
||||
blksread = gothowmany(blksleft);
|
||||
putreadblks(ar, blksread);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
extract(char **argv)
|
||||
{
|
||||
int ar;
|
||||
char *longname;
|
||||
Hdr *hp;
|
||||
|
||||
if (usefile)
|
||||
ar = open(usefile, OREAD);
|
||||
else
|
||||
ar = Stdin;
|
||||
if (ar < 0)
|
||||
sysfatal("can't open archive %s: %r", usefile);
|
||||
while ((hp = readhdr(ar)) != nil) {
|
||||
longname = name(hp);
|
||||
if (match(longname, argv))
|
||||
extract1(ar, hp, longname);
|
||||
else
|
||||
skip(ar, hp, longname);
|
||||
}
|
||||
if (ar > Stderr)
|
||||
close(ar);
|
||||
}
|
||||
|
||||
void
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
int errflg = 0;
|
||||
char *ret = nil;
|
||||
|
||||
quotefmtinstall();
|
||||
fmtinstall('M', dirmodefmt);
|
||||
|
||||
TARGBEGIN {
|
||||
case 'c':
|
||||
creat++;
|
||||
verb = Replace;
|
||||
break;
|
||||
case 'f':
|
||||
usefile = EARGF(usage());
|
||||
break;
|
||||
case 'g':
|
||||
argid = strtoul(EARGF(usage()), 0, 0);
|
||||
break;
|
||||
case 'p':
|
||||
posix++;
|
||||
break;
|
||||
case 'P':
|
||||
posix = 0;
|
||||
break;
|
||||
case 'r':
|
||||
verb = Replace;
|
||||
break;
|
||||
case 'R':
|
||||
relative++;
|
||||
break;
|
||||
case 't':
|
||||
verb = Toc;
|
||||
break;
|
||||
case 'T':
|
||||
settime++;
|
||||
break;
|
||||
case 'u':
|
||||
aruid = strtoul(EARGF(usage()), 0, 0);
|
||||
break;
|
||||
case 'v':
|
||||
verbose++;
|
||||
break;
|
||||
case 'x':
|
||||
verb = Xtract;
|
||||
break;
|
||||
case '-':
|
||||
break;
|
||||
default:
|
||||
errflg++;
|
||||
break;
|
||||
} TARGEND
|
||||
|
||||
if (argc < 0 || errflg)
|
||||
usage();
|
||||
|
||||
initblks();
|
||||
switch (verb) {
|
||||
case Toc:
|
||||
case Xtract:
|
||||
extract(argv);
|
||||
break;
|
||||
case Replace:
|
||||
if (getwd(origdir, sizeof origdir) == nil)
|
||||
strcpy(origdir, "/tmp");
|
||||
replace(argv);
|
||||
chdir(origdir); /* for profiling */
|
||||
break;
|
||||
default:
|
||||
usage();
|
||||
break;
|
||||
}
|
||||
exits(ret);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue