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create.c
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1991-01-24
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/*
* Create a tar archive.
*
* Written 25 Aug 1985 by John Gilmore, ihnp4!hoptoad!gnu.
*
* @(#)create.c 1.36 11/6/87 Public Domain - gnu
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifndef V7
#include <fcntl.h>
#endif
#if !defined(MSDOS) && !defined(AMIGA)
#include <pwd.h>
#include <grp.h>
#endif
#ifdef BSD42
#include <sys/dir.h>
#else
#ifdef MSDOS
#include <sys/dir.h>
#else
#ifdef AMIGA
#include <dirent.h>
#else
/*
* FIXME: On other systems there is no standard place for the header file
* for the portable directory access routines. Change the #include line
* below to bring it in from wherever it is.
*/
#include "ndir.h"
#endif
#endif
#endif
#ifdef USG
#include <sys/sysmacros.h> /* major() and minor() defined here */
#endif
/*
* V7 doesn't have a #define for this.
*/
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
/*
* Most people don't have a #define for this.
*/
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include "tar.h"
#include "port.h"
extern union record *head; /* Points to current tape header */
extern struct stat hstat; /* Stat struct corresponding */
extern int head_standard; /* Tape header is in ANSI format */
/*
* If there are no symbolic links, there is no lstat(). Use stat().
*/
#ifndef S_IFLNK
#define lstat stat
#endif
extern char *malloc();
extern char *strcpy();
extern char *strncpy();
extern void bzero();
extern void bcopy();
extern int errno;
extern void print_header();
union record *start_header();
void finish_header();
void finduname();
void findgname();
char *name_next();
void to_oct(), to_hex();
void dump_file();
static nolinks; /* Gets set if we run out of RAM */
void
create_archive()
{
register char *p;
open_archive(0); /* Open for writing */
while (p = name_next()) {
#ifdef AMIGA
if (!strcmp(p, ".")) /* convert . and ./ to "" */
p++;
else if (!strcmp(p, "./"))
p += 2;
#endif
dump_file(p, -1);
}
write_eot();
close_archive();
name_close();
}
/*
* Dump a single file. If it's a directory, recurse.
* Result is 1 for success, 0 for failure.
* Sets global "hstat" to stat() output for this file.
*/
void
dump_file(p, curdev)
char *p; /* File name to dump */
int curdev; /* Device our parent dir was on */
{
union record *header;
char type;
/*
* Use stat if following (rather than dumping) 4.2BSD's
* symbolic links. Otherwise, use lstat (which, on non-4.2
* systems, is #define'd to stat anyway.
*/
if (0 != f_follow_links? stat(p, &hstat): lstat(p, &hstat))
{
badperror:
perror(p);
badfile:
errors++;
return;
}
/*
* See if we are crossing from one file system to another,
* and avoid doing so if the user only wants to dump one file system.
*/
if (f_local_filesys && curdev >= 0 && curdev != hstat.st_dev) {
annorec(stderr, tar);
fprintf(stderr,
"%s: is on a different filesystem; not dumped\n",
p);
return;
}
#ifdef AMIGA
/*
* If f_archive_check is set, check the archived bit of the
* file and don't archive it if the bit is set and it's a normal
* file.
*/
if (f_archive_check && (hstat.st_prot & FIBF_ARCHIVE) &&
!(hstat.st_mode & S_IFDIR))
{
if (f_verbose > 1)
{
annorec(stderr, tar);
fprintf(stderr, "%s: archive bit set, not dumping\n", p);
}
return;
}
#endif
/*
* Check for multiple links.
*
* We maintain a list of all such files that we've written so
* far. Any time we see another, we check the list and
* avoid dumping the data again if we've done it once already.
*/
if (hstat.st_nlink > 1) switch (hstat.st_mode & S_IFMT) {
register struct link *lp;
case S_IFREG: /* Regular file */
#ifdef S_IFCTG
case S_IFCTG: /* Contigous file */
#endif
#ifdef S_IFCHR
case S_IFCHR: /* Character special file */
#endif
#ifdef S_IFBLK
case S_IFBLK: /* Block special file */
#endif
#ifdef S_IFIFO
case S_IFIFO: /* Fifo special file */
#endif
/* First quick and dirty. Hashing, etc later FIXME */
for (lp = linklist; lp; lp = lp->next) {
if (lp->ino == hstat.st_ino &&
lp->dev == hstat.st_dev) {
/* We found a link. */
hstat.st_size = 0;
header = start_header(p, &hstat);
if (header == NULL) goto badfile;
strcpy(header->header.linkname,
lp->name);
header->header.linkflag = LF_LINK;
finish_header(header);
/* FIXME: Maybe remove from list after all links found? */
return; /* We dumped it */
}
}
/* Not found. Add it to the list of possible links. */
lp = (struct link *) malloc( (unsigned)
(strlen(p) + sizeof(struct link) - NAMSIZ));
if (!lp) {
if (!nolinks) {
fprintf(stderr,
"tar: no memory for links, they will be dumped as separate files\n");
nolinks++;
}
}
lp->ino = hstat.st_ino;
lp->dev = hstat.st_dev;
strcpy(lp->name, p);
lp->next = linklist;
linklist = lp;
}
/*
* This is not a link to a previously dumped file, so dump it.
*/
switch (hstat.st_mode & S_IFMT) {
case S_IFREG: /* Regular file */
#ifdef S_IFCTG
case S_IFCTG: /* Contigous file */
#endif
{
int f; /* File descriptor */
int bufsize, count;
register long sizeleft;
register union record *start;
sizeleft = hstat.st_size;
/* Don't bother opening empty, world readable files. */
if (sizeleft > 0 || 0444 != (0444 & hstat.st_mode)) {
f = open(p, O_RDONLY|O_BINARY);
if (f < 0) goto badperror;
} else {
f = -1;
}
header = start_header(p, &hstat);
if (header == NULL) goto badfile;
#ifdef S_IFCTG
/* Mark contiguous files, if we support them */
if (f_standard && (hstat.st_mode & S_IFMT) == S_IFCTG) {
header->header.linkflag = LF_CONTIG;
}
#endif
finish_header(header);
while (sizeleft > 0) {
start = findrec();
bufsize = endofrecs()->charptr - start->charptr;
if (sizeleft < bufsize) {
/* Last read -- zero out area beyond */
bufsize = (int)sizeleft;
count = bufsize % RECORDSIZE;
if (count)
bzero(start->charptr + sizeleft,
RECORDSIZE - count);
}
count = read(f, start->charptr, bufsize);
if (count < 0) {
annorec(stderr, tar);
fprintf(stderr,
"read error at byte %ld, reading %d bytes, in file ",
hstat.st_size - sizeleft,
bufsize);
perror(p); /* FIXME */
goto padit;
}
sizeleft -= count;
/* This is nonportable (the type of userec's arg). */
userec(start+(count-1)/RECORDSIZE);
if (count == bufsize) continue;
annorec(stderr, tar);
fprintf(stderr,
"%s: file shrunk by %d bytes, padding with zeros.\n",
p, sizeleft);
goto padit; /* Short read */
}
if (f >= 0)
(void)close(f);
#ifdef AMIGA
if (f_archive_set)
{
if (SmartSetProtection(p, hstat.st_prot |
FIBF_ARCHIVE) < 0)
{
fputs("tar: Error setting archive bit on ", stderr);
perror(p);
}
}
#endif
break;
/*
* File shrunk or gave error, pad out tape to match
* the size we specified in the header.
*/
padit:
abort();
}
#ifdef S_IFLNK
case S_IFLNK: /* Symbolic link */
{
int size;
hstat.st_size = 0; /* Force 0 size on symlink */
header = start_header(p, &hstat);
if (header == NULL) goto badfile;
size = readlink(p, header->header.linkname, NAMSIZ);
if (size < 0) goto badperror;
if (size == NAMSIZ) {
annorec(stderr, tar);
fprintf(stderr,
"%s: symbolic link too long\n", p);
break;
}
header->header.linkname[size] = '\0';
header->header.linkflag = LF_SYMLINK;
finish_header(header); /* Nothing more to do to it */
}
break;
#endif
case S_IFDIR: /* Directory */
{
register DIR *dirp;
register struct dirent *d;
char namebuf[NAMSIZ+2];
register int len;
int our_device = hstat.st_dev;
/* Build new prototype name */
strncpy(namebuf, p, sizeof (namebuf));
#ifdef AMIGA
/*
* If user types "" (current dir), make namebuf be ./ - this
* will later be stripped.
*/
if (!*namebuf) {
strcpy(namebuf, "./");
}
#endif
len = strlen(namebuf);
while (len >= 1 && '/' == namebuf[len-1])
len--; /* Delete trailing slashes */
#ifdef AMIGA
if (namebuf[len - 1] != ':') /* no / after : */
namebuf[len++] = '/'; /* Now add exactly one back */
#else
namebuf[len++] = '/'; /* Now add exactly one back */
#endif
namebuf[len] = '\0'; /* Make sure null-terminated */
/*
* Output directory header record with permissions
* FIXME, do this AFTER files, to avoid R/O dir problems?
* If old archive format, don't write record at all.
*/
if (!f_oldarch) {
hstat.st_size = 0; /* Force 0 size on dir */
/*
* If people could really read standard archives,
* this should be: (FIXME)
header = start_header(f_standard? p: namebuf, &hstat);
* but since they'd interpret LF_DIR records as
* regular files, we'd better put the / on the name.
*/
header = start_header(namebuf, &hstat);
if (header == NULL)
goto badfile; /* eg name too long */
if (f_standard) {
header->header.linkflag = LF_DIR;
}
finish_header(header); /* Done with directory header */
}
/* Hack to remove "./" from the front of all the file names */
if (len == 2 && namebuf[0] == '.') {
len = 0;
}
/* Now output all the files in the directory */
if (f_dironly)
break; /* Unless the user says no */
errno = 0;
dirp = opendir(p);
if (!dirp) {
if (errno) {
perror (p);
} else {
annorec(stderr, tar);
fprintf(stderr, "%s: error opening directory",
p);
}
break;
}
/* Should speed this up by cd-ing into the dir, FIXME */
while (NULL != (d=readdir(dirp))) {
/* Skip . and .. */
if (d->d_name[0] == '.') {
if (d->d_name[1] == '\0') continue;
if (d->d_name[1] == '.') {
if (d->d_name[2] == '\0') continue;
}
}
if (strlen(d->d_name) + len >= NAMSIZ) {
annorec(stderr, tar);
fprintf(stderr, "%s%s: name too long\n",
namebuf, d->d_name);
continue;
}
strcpy(namebuf+len, d->d_name);
dump_file(namebuf, our_device);
}
closedir(dirp);
#ifdef AMIGA
if (f_archive_set)
{
if (SmartSetProtection(p, hstat.st_prot |
FIBF_ARCHIVE) < 0)
{
fputs("tar: Error setting archive bit on ", stderr);
perror(p);
}
}
#endif
}
break;
#ifdef S_IFCHR
case S_IFCHR: /* Character special file */
type = LF_CHR;
goto easy;
#endif
#ifdef S_IFBLK
case S_IFBLK: /* Block special file */
type = LF_BLK;
goto easy;
#endif
#ifdef S_IFIFO
case S_IFIFO: /* Fifo special file */
type = LF_FIFO;
#endif
easy:
if (!f_standard) goto unknown;
hstat.st_size = 0; /* Force 0 size */
header = start_header(p, &hstat);
if (header == NULL) goto badfile; /* eg name too long */
header->header.linkflag = type;
if (type != LF_FIFO) {
to_oct((long) major(hstat.st_rdev), 8,
header->header.devmajor);
to_oct((long) minor(hstat.st_rdev), 8,
header->header.devminor);
}
finish_header(header);
break;
default:
unknown:
annorec(stderr, tar);
fprintf(stderr,
"%s: Unknown file type; file ignored.\n", p);
break;
}
}
/*
* Make a header block for the file name whose stat info is st .
* Return header pointer for success, NULL if the name is too long.
*/
union record *
start_header(name, st)
char *name;
register struct stat *st;
{
register union record *header;
char newname[NAMSIZ+2];
header = (union record *) findrec();
bzero(header->charptr, sizeof(*header)); /* XXX speed up */
/*
* Check the file name and put it in the record.
*/
#ifdef AMIGA
cvtAmi2UNIX(name, newname);
name = newname; /* point name at newname, but leave orig string alone */
#else
while ('/' == *name) {
static int warned_once = 0;
name++; /* Force relative path */
if (!warned_once++) {
annorec(stderr, tar);
fprintf(stderr,
"Removing leading / from absolute path names in the archive.\n");
}
}
#endif
strcpy(header->header.name, name);
if (header->header.name[NAMSIZ-1]) {
annorec(stderr, tar);
fprintf(stderr, "%s: name too long\n", name);
return NULL;
}
to_oct((long) (st->st_mode & ~S_IFMT),
8, header->header.mode);
to_oct((long) st->st_uid, 8, header->header.uid);
to_oct((long) st->st_gid, 8, header->header.gid);
to_oct((long) st->st_size, 1+12, header->header.size);
to_oct((long) st->st_mtime, 1+12, header->header.mtime);
/* header->header.linkflag is left as null */
#ifdef AMIGA
strcpy(header->header.magic_cookie, "AmigaTar");
to_hex(st->st_prot, header->header.amiga_modes);
memset(header->header.comment, '\0', sizeof(header->header.comment));
strcpy(header->header.comment, st->st_comment);
to_hex(st->st_date.ds_Days, header->header.ds_Days);
to_hex(st->st_date.ds_Minute, header->header.ds_Minute);
to_hex(st->st_date.ds_Tick, header->header.ds_Tick);
#endif
#ifndef NONAMES
/* Fill in new Unix Standard fields if desired. */
if (f_standard) {
header->header.linkflag = LF_NORMAL; /* New default */
strcpy(header->header.magic, TMAGIC); /* Mark as Unix Std */
finduname(header->header.uname, st->st_uid);
findgname(header->header.gname, st->st_gid);
}
#endif
return header;
}
/*
* Finish off a filled-in header block and write it out.
* We also print the file name and/or full info if verbose is on.
*/
void
finish_header(header)
register union record *header;
{
register int i, sum;
register char *p;
bcopy(CHKBLANKS, header->header.chksum, sizeof(header->header.chksum));
sum = 0;
p = header->charptr;
for (i = sizeof(*header); --i >= 0; ) {
/*
* We can't use unsigned char here because of old compilers,
* e.g. V7.
*/
sum += 0xFF & *p++;
}
/*
* Fill in the checksum field. It's formatted differently
* from the other fields: it has [6] digits, a null, then a
* space -- rather than digits, a space, then a null.
* We use to_oct then write the null in over to_oct's space.
* The final space is already there, from checksumming, and
* to_oct doesn't modify it.
*
* This is a fast way to do:
* (void) sprintf(header->header.chksum, "%6o", sum);
*/
to_oct((long) sum, 8, header->header.chksum);
header->header.chksum[6] = '\0'; /* Zap the space */
userec(header);
if (f_verbose) {
/* These globals are parameters to print_header, sigh */
head = header;
/* hstat is already set up */
head_standard = f_standard;
print_header(stderr);
}
return;
}
/*
* Quick and dirty octal conversion.
* Converts long "value" into a "digs"-digit field at "where",
* including a trailing space and room for a null. "digs"==3 means
* 1 digit, a space, and room for a null.
*
* We assume the trailing null is already there and don't fill it in.
* This fact is used by start_header and finish_header, so don't change it!
*
* This should be equivalent to:
* (void) sprintf(where, "%*lo ", digs-2, value);
* except that sprintf fills in the trailing null and we don't.
*/
void
to_oct(value, digs, where)
register long value;
register int digs;
register char *where;
{
--digs; /* Trailing null slot is left alone */
where[--digs] = ' '; /* Put in the space, though */
/* Produce the digits -- at least one */
do {
where[--digs] = '0' + (char)(value & 7); /* one octal digit */
value >>= 3;
} while (digs > 0 && value != 0);
/* Leading spaces, if necessary */
while (digs > 0)
where[--digs] = ' ';
}
/*
* Write the EOT record(s).
* We actually zero at least one record, through the end of the block.
* Old tar writes garbage after two zeroed records -- and PDtar used to.
*/
write_eot()
{
union record *p;
int bufsize;
p = findrec();
bufsize = endofrecs()->charptr - p->charptr;
bzero(p->charptr, bufsize);
userec(p);
}
#ifdef AMIGA
/*
* 32-bit to 8 ascii chars as hex plus null term
*/
void
to_hex(u_long val, char *p)
{
int i, nibble;
p += 8; /* point to last char */
*p = '\0'; /* null term */
for (i = 0; i < 8; i++)
{
nibble = val & 0xf;
*--p = (nibble > 9) ? (nibble - 10) + 'a' : nibble + '0';
val >>= 4;
}
}
#endif