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|
/* tar.c - create/extract archives
*
* Copyright 2014 Ashwini Kumar <ak.ashwini81@gmail.com>
*
* For the command, see
* http://pubs.opengroup.org/onlinepubs/007908799/xcu/tar.html
* For the modern file format, see
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
* https://en.wikipedia.org/wiki/Tar_(computing)#File_format
* https://www.gnu.org/software/tar/manual/html_node/Tar-Internals.html
*
* For writing to external program
* http://www.gnu.org/software/tar/manual/html_node/Writing-to-an-External-Program.html
*
* Toybox will never implement the "pax" command as a matter of policy.
*
* Why --exclude pattern but no --include? tar cvzf a.tgz dir --include '*.txt'
* Extract into dir same as filename, --restrict? "Tarball is splodey"
*
USE_TAR(NEWTOY(tar, "&(full-time)(no-recursion)(numeric-owner)(no-same-permissions)(overwrite)(exclude)*(mtime):(group):(owner):(to-command):o(no-same-owner)p(same-permissions)k(keep-old)c(create)|h(dereference)x(extract)|t(list)|v(verbose)j(bzip2)z(gzip)O(to-stdout)m(touch)X(exclude-from)*T(files-from)*C(directory):f(file):[!txc][!jz]", TOYFLAG_USR|TOYFLAG_BIN))
config TAR
bool "tar"
default n
help
usage: tar [-cxtjzhmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR]
Create, extract, or list files in a .tar (or compressed t?z) file.
Options:
c Create x Extract t Test
f Name of TARFILE C Change to DIR first v Verbose: show filenames
o Ignore owner h Follow symlinks m Ignore mtime
j bzip2 compression z gzip compression
O Extract to stdout X exclude names in FILE T include names in FILE
--exclude=FILE File pattern(s) to exclude
*/
#define FOR_tar
#include "toys.h"
GLOBALS(
char *f, *C;
struct arg_list *T, *X;
char *to_command, *owner, *group, *mtime;
struct arg_list *exclude;
struct double_list *incl, *excl, *seen;
struct string_list *dirs;
char *cwd;
int fd, ouid, ggid, hlc, warn, adev, aino;
time_t mtt;
// hardlinks seen so far (hlc many)
struct {
char *arg;
ino_t ino;
dev_t dev;
} *hlx;
// Parsed information about a tar header.
struct tar_header {
char *name, *link_target, *uname, *gname;
long long size;
uid_t uid;
gid_t gid;
mode_t mode;
time_t mtime;
dev_t device;
} hdr;
)
struct tar_hdr {
char name[100], mode[8], uid[8], gid[8],size[12], mtime[12], chksum[8],
type, link[100], magic[8], uname[32], gname[32], major[8], minor[8],
prefix[155], padd[12];
};
// convert to int to octal (or base-256)
static void itoo(char *str, int len, unsigned long long val)
{
// Do we need binary encoding?
if (!(val>>(3*(len-1)))) sprintf(str, "%0*llo", len-1, val);
else {
*str = 128;
while (--len) *++str = val>>(3*len);
}
}
#define ITOO(x, y) itoo(x, sizeof(x), y)
// convert octal (or base-256) to int
static unsigned long long otoi(char *str, unsigned len)
{
unsigned long long val = 0;
// When tar value too big or octal, use binary encoding with high bit set
if (128&*str) while (--len) val = (val<<8)+*++str;
else {
while (len && *str>='0' && *str<='7') val = val*8+*str++-'0', len--;
if (len && *str && *str != ' ') error_exit("bad header");
}
return val;
}
// Calculate packet checksum, with cksum field treated as 8 spaces
static unsigned cksum(void *data)
{
unsigned i, cksum = 8*' ';
for (i = 0; i<500; i += (i==147) ? 9 : 1) cksum += ((char *)data)[i];
return cksum;
}
static void write_longname(char *name, char type)
{
struct tar_hdr tmp;
int sz = strlen(name) +1;
memset(&tmp, 0, sizeof(tmp));
strcpy(tmp.name, "././@LongLink");
ITOO(tmp.uid, 0);
ITOO(tmp.gid, 0);
ITOO(tmp.size, sz);
ITOO(tmp.mtime, 0);
tmp.type = type;
strcpy(tmp.magic, "ustar ");
// Historical nonsense to match other implementations. Never used.
ITOO(tmp.mode, 0644);
strcpy(tmp.uname, "root");
strcpy(tmp.gname, "root");
// Calculate checksum. Since 512*255 = 0377000 in octal, this can never
// use more than 6 digits. The last byte is ' ' or historical reasons.
itoo(tmp.chksum, sizeof(tmp.chksum)-1, cksum(&tmp));
tmp.chksum[7] = ' ';
// write header and name, padded with NUL to block size
xwrite(TT.fd, &tmp, 512);
xwrite(TT.fd, name, sz);
if (sz%512) xwrite(TT.fd, toybuf, 512-(sz%512));
}
static struct double_list *filter(struct double_list *lst, char *name)
{
struct double_list *end = lst;
if (lst)
do if (!fnmatch(lst->data, name, 1<<3)) return lst;
while (end != (lst = lst->next));
return 0;
}
static void skippy(long long len)
{
if (lskip(TT.fd, len)) perror_exit("EOF");
}
// allocate and read data from TT.fd
static void alloread(void *buf, int len)
{
// actually void **, but automatic typecasting doesn't work with void ** :(
void **b = buf;
free(*b);
*b = xmalloc(len+1);
xreadall(TT.fd, *b, len);
b[len] = 0;
}
static int add_to_tar(struct dirtree *node)
{
struct stat *st = &(node->st);
struct tar_hdr hdr;
struct passwd *pw = pw;
struct group *gr = gr;
int i, fd =-1;
char *c, *p, *name, *lnk = lnk, *hname;
if (!dirtree_notdotdot(node)) return 0;
if (TT.adev == st->st_dev && TT.aino == st->st_ino) {
error_msg("'%s' file is the archive; not dumped", node->name);
return 0;
}
i = 1;
name = dirtree_path(node, &i);
// exclusion defaults to --no-anchored and --wildcards-match-slash
for (p = name; *p; p++)
if ((p == name || p[-1] == '/') && *p != '/' && filter(TT.excl, p))
goto done;
// The 1 extra byte from dirtree_path()
if (S_ISDIR(st->st_mode) && name[i-1] != '/') strcat(name, "/");
// remove leading / and any .. entries from saved name
for (hname = name; *hname == '/'; hname++);
for (c = hname;;) {
if (!(c = strstr(c, ".."))) break;
if (c == hname || c[-1] == '/') {
if (!c[2]) goto done;
if (c[2]=='/') c = hname = c+3;
} else c+= 2;
}
if (!*hname) goto done;
if (TT.warn && hname != name) {
fprintf(stderr, "removing leading '%.*s' from member names\n",
(int)(hname-name), name);
TT.warn = 0;
}
if (TT.owner) st->st_uid = TT.ouid;
if (TT.group) st->st_gid = TT.ggid;
if (TT.mtime) st->st_mtime = TT.mtt;
memset(&hdr, 0, sizeof(hdr));
strncpy(hdr.name, hname, sizeof(hdr.name));
ITOO(hdr.mode, st->st_mode &07777);
ITOO(hdr.uid, st->st_uid);
ITOO(hdr.gid, st->st_gid);
ITOO(hdr.size, 0); //set size later
ITOO(hdr.mtime, st->st_mtime);
strcpy(hdr.magic, "ustar ");
// Hard link or symlink? i=0 neither, i=1 hardlink, i=2 symlink
// Are there hardlinks to a non-directory entry?
if (st->st_nlink>1 && !S_ISDIR(st->st_mode)) {
// Have we seen this dev&ino before?
for (i = 0; i<TT.hlc; i++) {
if (st->st_ino == TT.hlx[i].ino && st->st_dev == TT.hlx[i].dev)
break;
}
if (i != TT.hlc) {
lnk = TT.hlx[i].arg;
i = 1;
} else {
// first time we've seen it. Store as normal file, but remember it.
if (!(TT.hlc&255)) TT.hlx = xrealloc(TT.hlx, TT.hlc+256);
TT.hlx[TT.hlc].arg = xstrdup(hname);
TT.hlx[TT.hlc].ino = st->st_ino;
TT.hlx[TT.hlc].dev = st->st_dev;
TT.hlc++;
i = 0;
}
} else i = 0;
// !i because hardlink to a symlink is a thing.
if (!i && S_ISLNK(st->st_mode)) {
i = 2;
lnk = xreadlink(name);
}
// Handle file types
if (i) {
hdr.type = '0'+i;
if (i==2 && !(lnk = xreadlink(name))) {
perror_msg("readlink");
goto done;
}
if (strlen(lnk) > sizeof(hdr.link)) write_longname(lnk, 'K');
strncpy(hdr.link, lnk, sizeof(hdr.link));
if (i) free(lnk);
} else if (S_ISREG(st->st_mode)) {
hdr.type = '0';
ITOO(hdr.size, st->st_size);
} else if (S_ISDIR(st->st_mode)) hdr.type = '5';
else if (S_ISFIFO(st->st_mode)) hdr.type = '6';
else if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
hdr.type = (S_ISCHR(st->st_mode))?'3':'4';
ITOO(hdr.major, dev_major(st->st_rdev));
ITOO(hdr.minor, dev_minor(st->st_rdev));
} else {
error_msg("unknown file type '%o'", st->st_mode & S_IFMT);
goto done;
}
if (strlen(hname) > sizeof(hdr.name)) write_longname(hname, 'L');
if (!FLAG(numeric_owner)) {
if (TT.owner || (pw = bufgetpwuid(st->st_uid)))
strncpy(hdr.uname, TT.owner ? TT.owner : pw->pw_name, sizeof(hdr.uname));
if (TT.group || (gr = bufgetgrgid(st->st_gid)))
strncpy(hdr.gname, TT.group ? TT.group : gr->gr_name, sizeof(hdr.gname));
}
itoo(hdr.chksum, sizeof(hdr.chksum)-1, cksum(&hdr));
hdr.chksum[7] = ' ';
if (FLAG(v)) printf("%s\n", hname);
// Write header and data to archive
xwrite(TT.fd, &hdr, 512);
if (hdr.type == '0') {
if ((fd = open(name, O_RDONLY)) < 0) perror_msg("can't open '%s'", name);
else {
xsendfile_pad(fd, TT.fd, st->st_size);
if (st->st_size%512) writeall(TT.fd, toybuf, (512-(st->st_size%512)));
close(fd);
}
}
done:
free(name);
return (DIRTREE_RECURSE|(FLAG(h)?DIRTREE_SYMFOLLOW:0))*!FLAG(no_recursion);
}
// Does anybody actually use this?
static void extract_to_command(void)
{
int pipefd[2], status = 0;
pid_t cpid;
if (!S_ISREG(TT.hdr.mode)) return; //only regular files are supported.
xpipe(pipefd);
if (!(cpid = xfork())) { // Child reads from pipe
char buf[64], *argv[4] = {"sh", "-c", TT.to_command, NULL};
setenv("TAR_FILETYPE", "f", 1);
sprintf(buf, "%0o", TT.hdr.mode);
setenv("TAR_MODE", buf, 1);
sprintf(buf, "%ld", (long)TT.hdr.size);
setenv("TAR_SIZE", buf, 1);
setenv("TAR_FILENAME", TT.hdr.name, 1);
setenv("TAR_UNAME", TT.hdr.uname, 1);
setenv("TAR_GNAME", TT.hdr.gname, 1);
sprintf(buf, "%0llo", (long long)TT.hdr.mtime);
setenv("TAR_MTIME", buf, 1);
sprintf(buf, "%0o", TT.hdr.uid);
setenv("TAR_UID", buf, 1);
sprintf(buf, "%0o", TT.hdr.gid);
setenv("TAR_GID", buf, 1);
xclose(pipefd[1]); // Close unused write
dup2(pipefd[0], 0);
signal(SIGPIPE, SIG_DFL);
xexec(argv);
} else {
xclose(pipefd[0]); // Close unused read end
xsendfile_len(TT.fd, pipefd[1], TT.hdr.size);
xclose(pipefd[1]);
waitpid(cpid, &status, 0);
if (WIFSIGNALED(status))
xprintf("tar : %d: child returned %d\n", cpid, WTERMSIG(status));
}
}
// Do pending directory utimes(), NULL to flush all.
static int dirflush(char *name)
{
char *s = s, *ss;
// Barf if name not in TT.cwd
if (name) {
ss = s = xabspath(name, -1);
if (TT.cwd[1] && (!strstart(&ss, TT.cwd) || *ss!='/')) {
error_msg("'%s' not under '%s'", name, TT.cwd);
free(s);
return 1;
}
}
// Set deferred utimes() for directories this file isn't under.
// (Files must be depth-first ordered in tarball for this to matter.)
while (TT.dirs) {
long long ll = *(long long *)TT.dirs->str;
struct timeval times[2] = {{ll, 0},{ll, 0}};
// If next file is under (or equal to) this dir, keep waiting
if (name && strstart(&ss, ss = s) && (!*ss || *ss=='/')) break;
if (utimes(TT.dirs->str+sizeof(long long), times))
perror_msg("utimes %lld %s", ll,
TT.dirs->str+sizeof(long long));
free(llist_pop(&TT.dirs));
}
free(s);
// name was under TT.cwd
return 0;
}
static void extract_to_disk(void)
{
char *name = TT.hdr.name;
int ala = TT.hdr.mode;
if (dirflush(name)) {
if (S_ISREG(ala) && !TT.hdr.link_target) skippy(TT.hdr.size);
return;
}
// create path before file if necessary
if (strrchr(name, '/') && mkpath(name) && errno !=EEXIST)
return perror_msg(":%s: can't mkdir", name);
// remove old file, if exists
if (!FLAG(k) && !S_ISDIR(ala) && unlink(name) && errno!=ENOENT)
return perror_msg("can't remove: %s", name);
if (S_ISREG(ala)) {
// hardlink?
if (TT.hdr.link_target) {
if (link(TT.hdr.link_target, name))
return perror_msg("can't link '%s' -> '%s'", name, TT.hdr.link_target);
// write contents
} else {
int fd = xcreate(name, O_WRONLY|O_CREAT|(FLAG(overwrite)?O_TRUNC:O_EXCL),
WARN_ONLY|(ala & 07777));
if (fd != -1) {
xsendfile_len(TT.fd, fd, TT.hdr.size);
close(fd);
}
}
} else if (S_ISDIR(ala)) {
if ((mkdir(name, 0700) == -1) && errno != EEXIST)
return perror_msg("%s: can't create", TT.hdr.name);
} else if (S_ISLNK(ala)) {
if (symlink(TT.hdr.link_target, TT.hdr.name))
return perror_msg("can't link '%s' -> '%s'", name, TT.hdr.link_target);
} else if (mknod(name, ala, TT.hdr.device))
return perror_msg("can't create '%s'", name);
// Set ownership
if (!FLAG(o) && !geteuid()) {
int u = TT.hdr.uid, g = TT.hdr.gid;
if (TT.owner) TT.hdr.uid = TT.ouid;
else if (!FLAG(numeric_owner) && *TT.hdr.uname) {
struct passwd *pw = getpwnam(TT.hdr.uname);
if (pw && (TT.owner || !FLAG(numeric_owner))) TT.hdr.uid = pw->pw_uid;
}
if (TT.group) TT.hdr.gid = TT.ggid;
else if (!FLAG(numeric_owner) && *TT.hdr.uname) {
struct group *gr = getgrnam(TT.hdr.gname);
if (gr) TT.hdr.gid = gr->gr_gid;
}
if (lchown(name, u, g)) perror_msg("chown %d:%d '%s'", u, g, name);;
}
// || !FLAG(no_same_permissions))
if (FLAG(p) && !S_ISLNK(ala)) chmod(TT.hdr.name, ala);
// Apply mtime.
if (!FLAG(m)) {
if (S_ISDIR(ala)) {
struct string_list *sl;
// Writing files into a directory changes directory timestamps, so
// defer mtime updates until contents written.
sl = xmalloc(sizeof(struct string_list)+sizeof(long long)+strlen(name)+1);
*(long long *)sl->str = TT.hdr.mtime;
strcpy(sl->str+sizeof(long long), name);
sl->next = TT.dirs;
TT.dirs = sl;
} else {
struct timeval times[2] = {{TT.hdr.mtime, 0},{TT.hdr.mtime, 0}};
utimes(TT.hdr.name, times);
}
}
}
static void unpack_tar(void)
{
struct double_list *walk, *delete;
struct tar_hdr tar;
int i, and = 0;
unsigned maj, min;
char *s;
for (;;) {
// align to next block and read it
if (TT.hdr.size%512) skippy(512-TT.hdr.size%512);
i = readall(TT.fd, &tar, 512);
if (i && i != 512) error_exit("read error");
// Two consecutive empty headers ends tar even if there's more data
if (!i || !*tar.name) {
if (!i || and++) {
dirflush(0);
return;
}
TT.hdr.size = 0;
continue;
}
// ensure null temination even of pathological packets
tar.padd[0] = and = 0;
// Is this a valid Unix Standard TAR header?
if (memcmp(tar.magic, "ustar", 5)) error_exit("bad header");
if (cksum(&tar) != otoi(tar.chksum, sizeof(tar.chksum)))
error_exit("bad cksum");
TT.hdr.size = otoi(tar.size, sizeof(tar.size));
// If this header isn't writing something to the filesystem
if (tar.type<'0' || tar.type>'7') {
// Long name extension header?
if (tar.type == 'K') alloread(&TT.hdr.link_target, TT.hdr.size);
else if (tar.type == 'L') alloread(&TT.hdr.name, TT.hdr.size);
else if (tar.type == 'x') {
char *p, *buf = 0;
int i, len, n;
// Posix extended record "LEN NAME=VALUE\n" format
alloread(&buf, TT.hdr.size);
for (p = buf; (p-buf)<TT.hdr.size; p += len) {
i = sscanf(p, "%u path=%n", &len, &n);
if (i<1 || len<4 || len>TT.hdr.size) {
error_msg("bad header");
break;
}
p[len-1] = 0;
if (i == 2) {
TT.hdr.name = xstrdup(p+n);
break;
}
}
free(buf);
// Ignore everything else.
} else skippy(TT.hdr.size);
continue;
}
// At this point, we have something to output. Convert metadata.
TT.hdr.mode = otoi(tar.mode, sizeof(tar.mode));
TT.hdr.mode |= (char []){8,8,10,2,6,4,1,8}[tar.type-'0']<<12;
TT.hdr.uid = otoi(tar.uid, sizeof(tar.uid));
TT.hdr.gid = otoi(tar.gid, sizeof(tar.gid));
TT.hdr.mtime = otoi(tar.mtime, sizeof(tar.mtime));
maj = otoi(tar.major, sizeof(tar.major));
min = otoi(tar.minor, sizeof(tar.minor));
TT.hdr.device = dev_makedev(maj, min);
TT.hdr.uname = xstrndup(TT.owner ? TT.owner : tar.uname, sizeof(tar.uname));
TT.hdr.gname = xstrndup(TT.group ? TT.group : tar.gname, sizeof(tar.gname));
if (TT.owner) TT.hdr.uid = TT.ouid;
else if (!FLAG(numeric_owner)) {
struct passwd *pw = getpwnam(TT.hdr.uname);
if (pw && (TT.owner || !FLAG(numeric_owner))) TT.hdr.uid = pw->pw_uid;
}
if (TT.group) TT.hdr.gid = TT.ggid;
else if (!FLAG(numeric_owner)) {
struct group *gr = getgrnam(TT.hdr.gname);
if (gr) TT.hdr.gid = gr->gr_gid;
}
if (!TT.hdr.link_target && *tar.link)
TT.hdr.link_target = xstrndup(tar.link, sizeof(tar.link));
if (!TT.hdr.name) {
// Glue prefix and name fields together with / if necessary
i = strnlen(tar.prefix, sizeof(tar.prefix));
TT.hdr.name = xmprintf("%.*s%s%.*s", i, tar.prefix,
(i && tar.prefix[i-1] != '/') ? "/" : "",
(int)sizeof(tar.name), tar.name);
}
// Old broken tar recorded dir as "file with trailing slash"
if (S_ISREG(TT.hdr.mode) && (s = strend(TT.hdr.name, "/"))) {
*s = 0;
TT.hdr.mode = (TT.hdr.mode & ~S_IFMT) | S_IFDIR;
}
// Non-regular files don't have contents stored in archive.
if ((TT.hdr.link_target && *TT.hdr.link_target) || !S_ISREG(TT.hdr.mode))
TT.hdr.size = 0;
// Files are seen even if excluded, so check them here.
// TT.seen points to first seen entry in TT.incl, or NULL if none yet.
if ((delete = filter(TT.incl, TT.hdr.name)) && TT.incl != TT.seen) {
if (!TT.seen) TT.seen = delete;
// Move seen entry to end of list.
if (TT.incl == delete) TT.incl = TT.incl->next;
else for (walk = TT.incl; walk != TT.seen; walk = walk->next) {
if (walk == delete) {
dlist_pop(&walk);
dlist_add_nomalloc(&TT.incl, delete);
}
}
}
// Skip excluded files
if (filter(TT.excl, TT.hdr.name) || (TT.incl && !delete))
skippy(TT.hdr.size);
else if (FLAG(t)) {
if (FLAG(v)) {
struct tm *lc = localtime(TT.mtime ? &TT.mtt : &TT.hdr.mtime);
char perm[12], gname[12];
mode_to_string(TT.hdr.mode, perm);
printf("%s", perm);
sprintf(perm, "%u", TT.hdr.uid);
sprintf(gname, "%u", TT.hdr.gid);
printf(" %s/%s ", *TT.hdr.uname ? TT.hdr.uname : perm,
*TT.hdr.gname ? TT.hdr.gname : gname);
if (tar.type=='3' || tar.type=='4') printf("%u,%u", maj, min);
else printf("%9lld", (long long)TT.hdr.size);
sprintf(perm, ":%02d", lc->tm_sec);
printf(" %d-%02d-%02d %02d:%02d%s ", 1900+lc->tm_year, 1+lc->tm_mon,
lc->tm_mday, lc->tm_hour, lc->tm_min, FLAG(full_time) ? perm : "");
}
printf(" %s", TT.hdr.name);
if (TT.hdr.link_target) printf(" -> %s", TT.hdr.link_target);
xputc('\n');
skippy(TT.hdr.size);
} else {
if (FLAG(v)) printf("%s\n", TT.hdr.name);
if (FLAG(O)) xsendfile_len(TT.fd, 0, TT.hdr.size);
else if (FLAG(to_command)) extract_to_command();
else extract_to_disk();
}
free(TT.hdr.name);
free(TT.hdr.link_target);
free(TT.hdr.uname);
free(TT.hdr.gname);
TT.hdr.name = TT.hdr.link_target = 0;
}
}
// Add copy of filename to TT.incl or TT.excl, minus trailing \n and /
static void trim_list(char **pline, long len)
{
char *n = strdup(*pline);
int i = strlen(n);
dlist_add(TT.X ? &TT.excl : &TT.incl, n);
if (i && n[i-1]=='\n') i--;
while (i && n[i-1] == '/') i--;
n[i] = 0;
}
void tar_main(void)
{
char *s, **args = toys.optargs;
// When extracting to command
signal(SIGPIPE, SIG_IGN);
if (!geteuid()) toys.optflags |= FLAG_p;
if (TT.owner) TT.ouid = xgetuid(TT.owner);
if (TT.group) TT.ggid = xgetgid(TT.group);
if (TT.mtime) xparsedate(TT.mtime, &TT.mtt, (void *)&s, 1);
// Collect file list. Note: trim_list appends to TT.incl when !TT.X
for (;TT.X; TT.X = TT.X->next) do_lines(xopenro(TT.X->arg), '\n', trim_list);
for (args = toys.optargs; *args; args++) trim_list(args, strlen(*args));
for (;TT.T; TT.T = TT.T->next) do_lines(xopenro(TT.T->arg), '\n', trim_list);
// Open archive file
if (FLAG(c)) {
if (!TT.incl) error_exit("empty archive");
TT.fd = 1;
}
if (TT.f && strcmp(TT.f, "-"))
TT.fd = xcreate(TT.f, TT.fd*(O_WRONLY|O_CREAT|O_TRUNC), 0666);
// grab archive inode
{
struct stat st;
if (!fstat(TT.fd, &st)) {
TT.aino = st.st_ino;
TT.adev = st.st_dev;
}
}
// Get destination directory
if (TT.C) xchdir(TT.C);
TT.cwd = xabspath(s = xgetcwd(), 1);
free(s);
// Are we reading?
if (FLAG(x)||FLAG(t)) {
if (FLAG(j)||FLAG(z)) {
int pipefd[2] = {TT.fd, -1};
xpopen_both((char *[]){FLAG(z)?"gunzip":"bunzip2", "-cf", "-", NULL},
pipefd);
close(TT.fd);
TT.fd = pipefd[1];
}
unpack_tar();
if (TT.seen != TT.incl) {
if (!TT.seen) TT.seen = TT.incl;
while (TT.incl != TT.seen) {
error_msg("'%s' not in archive", TT.incl->data);
TT.incl = TT.incl->next;
}
}
// are we writing? (Don't have to test flag here, one of 3 must be set)
} else {
struct double_list *dl = TT.incl;
if (FLAG(j)||FLAG(z)) {
int pipefd[2] = {-1, TT.fd};
xpopen_both((char *[]){FLAG(z)?"gzip":"bzip2", "-f", NULL}, pipefd);
close(TT.fd);
TT.fd = pipefd[0];
}
do {
TT.warn = 1;
dirtree_flagread(dl->data, FLAG(h)?DIRTREE_SYMFOLLOW:0, add_to_tar);
} while (TT.incl != (dl = dl->next));
writeall(TT.fd, toybuf, 1024);
}
if (CFG_TOYBOX_FREE) {
while(TT.hlc) free(TT.hlx[--TT.hlc].arg);
free(TT.hlx);
close(TT.fd);
}
}
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