blob: b6d27cb6a4cfd28fb9417f5fd08ef24cda633d9d [file] [log] [blame]
/* tar.c - create/extract archives
*
* Copyright 2014 Ashwini Kumar <ak.ashwini81@gmail.com>
*
* USTAR interchange format is of interest in
* See http://http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html
* For writing to external program
* http://www.gnu.org/software/tar/manual/html_node/Writing-to-an-External-Program.html
USE_TAR(NEWTOY(tar, "&(no-recursion)(numeric-owner)(no-same-permissions)(overwrite)(exclude)*(to-command):o(no-same-owner)p(same-permissions)k(keep-old)c(create)|h(dereference)x(extract)|t(list)|v(verbose)z(gzip)O(to-stdout)m(touch)X(exclude-from)*T(files-from)*C(directory):f(file):[!txc]", TOYFLAG_USR|TOYFLAG_BIN))
config TAR
bool "tar"
default n
help
usage: tar -[cxtzhmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR]
Create, extract, or list files from a tar file
Operation:
c Create
f Name of TARFILE ('-' for stdin/out)
h Follow symlinks
m Don't restore mtime
t List
v Verbose
x Extract
z (De)compress using gzip
C Change to DIR before operation
O Extract to stdout
exclude=FILE File to exclude
X File with names to exclude
T File with names to include
*/
#define FOR_tar
#include "toys.h"
GLOBALS(
char *fname;
char *dir;
struct arg_list *inc_file;
struct arg_list *exc_file;
char *tocmd;
struct arg_list *exc;
struct arg_list *inc, *pass;
void *inodes, *handle;
)
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];
};
struct file_header {
char *name, *link_target, *uname, *gname;
off_t size;
uid_t uid;
gid_t gid;
mode_t mode;
time_t mtime;
dev_t device;
};
struct archive_handler {
int src_fd;
struct file_header file_hdr;
off_t offset;
void (*extract_handler)(struct archive_handler*);
};
struct inode_list {
struct inode_list *next;
char *arg;
ino_t ino;
dev_t dev;
};
static void copy_in_out(int src, int dst, off_t size)
{
int i, rd, rem = size%512, cnt;
cnt = size/512 + (rem?1:0);
for (i = 0; i < cnt; i++) {
rd = (i == cnt-1 && rem) ? rem : 512;
xreadall(src, toybuf, rd);
writeall(dst, toybuf, rd);
}
}
//convert to octal
static void itoo(char *str, int len, off_t val)
{
char *t, tmp[sizeof(off_t)*3+1];
int cnt = sprintf(tmp, "%0*llo", len, (unsigned long long)val);
t = tmp + cnt - len;
if (*t == '0') t++;
memcpy(str, t, len);
}
static struct inode_list *seen_inode(void **list, struct stat *st, char *name)
{
if (!st) llist_traverse(*list, llist_free_arg);
else if (!S_ISDIR(st->st_mode) && st->st_nlink > 1) {
struct inode_list *new;
for (new = *list; new; new = new->next)
if(new->ino == st->st_ino && new->dev == st->st_dev)
return new;
new = xzalloc(sizeof(*new));
new->ino = st->st_ino;
new->dev = st->st_dev;
new->arg = xstrdup(name);
new->next = *list;
*list = new;
}
return 0;
}
static void write_longname(struct archive_handler *tar, char *name, char type)
{
struct tar_hdr tmp;
unsigned int sum = 0;
int i, sz = strlen(name) +1;
char buf[512] = {0,};
memset(&tmp, 0, sizeof(tmp));
strcpy(tmp.name, "././@LongLink");
sprintf(tmp.mode, "%0*d", (int)sizeof(tmp.mode)-1, 0);
sprintf(tmp.uid, "%0*d", (int)sizeof(tmp.uid)-1, 0);
sprintf(tmp.gid, "%0*d", (int)sizeof(tmp.gid)-1, 0);
sprintf(tmp.size, "%0*d", (int)sizeof(tmp.size)-1, 0);
sprintf(tmp.mtime, "%0*d", (int)sizeof(tmp.mtime)-1, 0);
itoo(tmp.size, sizeof(tmp.size), sz);
tmp.type = type;
memset(tmp.chksum, ' ', 8);
strcpy(tmp.magic, "ustar ");
for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&tmp)[i];
itoo(tmp.chksum, sizeof(tmp.chksum)-1, sum);
writeall(tar->src_fd, (void*) &tmp, sizeof(tmp));
//write name to archive
writeall(tar->src_fd, name, sz);
if (sz%512) writeall(tar->src_fd, buf, (512-(sz%512)));
}
static int filter(struct arg_list *lst, char *name)
{
struct arg_list *cur;
for (cur = lst; cur; cur = cur->next)
if (!fnmatch(cur->arg, name, 1<<3)) return 1;
return 0;
}
static void add_file(struct archive_handler *tar, char **nam, struct stat *st)
{
struct tar_hdr hdr;
struct passwd *pw;
struct group *gr;
struct inode_list *node;
int i, fd =-1;
char *c, *p, *name = *nam, *lnk, *hname, buf[512] = {0,};
unsigned int sum = 0;
static int warn = 1;
for (p = name; *p; p++)
if ((p == name || p[-1] == '/') && *p != '/'
&& filter(TT.exc, p)) return;
if (S_ISDIR(st->st_mode) && name[strlen(name)-1] != '/') {
lnk = xmprintf("%s/",name);
free(name);
*nam = name = lnk;
}
hname = name;
//remove leading '/' or relative path '../' component
if (*hname == '/') hname++;
if (!*hname) return;
while ((c = strstr(hname, "../"))) hname = c + 3;
if (warn && hname != name) {
fprintf(stderr, "removing leading '%.*s' "
"from member names\n", (int)(hname-name), name);
warn = 0;
}
memset(&hdr, 0, sizeof(hdr));
strncpy(hdr.name, hname, sizeof(hdr.name));
itoo(hdr.mode, sizeof(hdr.mode), st->st_mode &07777);
itoo(hdr.uid, sizeof(hdr.uid), st->st_uid);
itoo(hdr.gid, sizeof(hdr.gid), st->st_gid);
itoo(hdr.size, sizeof(hdr.size), 0); //set size later
itoo(hdr.mtime, sizeof(hdr.mtime), st->st_mtime);
for (i=0; i<sizeof(hdr.chksum); i++) hdr.chksum[i] = ' ';
if ((node = seen_inode(&TT.inodes, st, hname))) {
//this is a hard link
hdr.type = '1';
if (strlen(node->arg) > sizeof(hdr.link))
write_longname(tar, hname, 'K'); //write longname LINK
xstrncpy(hdr.link, node->arg, sizeof(hdr.link));
} else if (S_ISREG(st->st_mode)) {
hdr.type = '0';
if (st->st_size <= (off_t)0777777777777LL)
itoo(hdr.size, sizeof(hdr.size), st->st_size);
else {
error_msg("can't store file '%s' of size '%lld'\n",
hname, (unsigned long long)st->st_size);
return;
}
} else if (S_ISLNK(st->st_mode)) {
hdr.type = '2'; //'K' long link
if (!(lnk = xreadlink(name))) {
perror_msg("readlink");
return;
}
if (strlen(lnk) > sizeof(hdr.link))
write_longname(tar, hname, 'K'); //write longname LINK
xstrncpy(hdr.link, lnk, sizeof(hdr.link));
free(lnk);
}
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, sizeof(hdr.major), dev_major(st->st_rdev));
itoo(hdr.minor, sizeof(hdr.minor), dev_minor(st->st_rdev));
} else {
error_msg("unknown file type '%o'", st->st_mode & S_IFMT);
return;
}
if (strlen(hname) > sizeof(hdr.name))
write_longname(tar, hname, 'L'); //write longname NAME
strcpy(hdr.magic, "ustar ");
if ((pw = getpwuid(st->st_uid)))
snprintf(hdr.uname, sizeof(hdr.uname), "%s", pw->pw_name);
else snprintf(hdr.uname, sizeof(hdr.uname), "%d", st->st_uid);
if ((gr = getgrgid(st->st_gid)))
snprintf(hdr.gname, sizeof(hdr.gname), "%s", gr->gr_name);
else snprintf(hdr.gname, sizeof(hdr.gname), "%d", st->st_gid);
//calculate chksum.
for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&hdr)[i];
itoo(hdr.chksum, sizeof(hdr.chksum)-1, sum);
if (toys.optflags & FLAG_v) printf("%s\n",hname);
writeall(tar->src_fd, (void*)&hdr, 512);
//write actual data to archive
if (hdr.type != '0') return; //nothing to write
if ((fd = open(name, O_RDONLY)) < 0) {
perror_msg("can't open '%s'", name);
return;
}
copy_in_out(fd, tar->src_fd, st->st_size);
if (st->st_size%512) writeall(tar->src_fd, buf, (512-(st->st_size%512)));
close(fd);
}
static int add_to_tar(struct dirtree *node)
{
struct stat st;
char *path;
struct archive_handler *hdl = (struct archive_handler*)TT.handle;
if (!fstat(hdl->src_fd, &st) && st.st_dev == node->st.st_dev
&& st.st_ino == node->st.st_ino) {
error_msg("'%s' file is the archive; not dumped", TT.fname);
return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
}
if (!dirtree_notdotdot(node)) return 0;
path = dirtree_path(node, 0);
add_file(hdl, &path, &(node->st)); //path may be modified
free(path);
if (toys.optflags & FLAG_no_recursion) return 0;
return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
}
static void compress_stream(struct archive_handler *tar_hdl)
{
int pipefd[2];
pid_t cpid;
xpipe(pipefd);
signal(SIGPIPE, SIG_IGN);
cpid = fork();
if (cpid == -1) perror_exit("fork");
if (!cpid) { /* Child reads from pipe */
char *argv[] = {"gzip", "-f", NULL};
xclose(pipefd[1]); /* Close unused write*/
dup2(pipefd[0], 0);
dup2(tar_hdl->src_fd, 1); //write to tar fd
xexec(argv);
} else {
xclose(pipefd[0]); /* Close unused read end */
dup2(pipefd[1], tar_hdl->src_fd); //write to pipe
}
}
static void extract_to_stdout(struct archive_handler *tar)
{
struct file_header *file_hdr = &tar->file_hdr;
copy_in_out(tar->src_fd, 0, file_hdr->size);
tar->offset += file_hdr->size;
}
static void extract_to_command(struct archive_handler *tar)
{
int pipefd[2], status = 0;
pid_t cpid;
struct file_header *file_hdr = &tar->file_hdr;
if (pipe(pipefd) == -1) error_exit("pipe");
if (!S_ISREG(file_hdr->mode)) return; //only regular files are supported.
cpid = fork();
if (cpid == -1) perror_exit("fork");
if (!cpid) { // Child reads from pipe
char buf[64], *argv[4] = {"sh", "-c", TT.tocmd, NULL};
setenv("TAR_FILETYPE", "f", 1);
sprintf(buf, "%0o", file_hdr->mode);
setenv("TAR_MODE", buf, 1);
sprintf(buf, "%ld", (long)file_hdr->size);
setenv("TAR_SIZE", buf, 1);
setenv("TAR_FILENAME", file_hdr->name, 1);
setenv("TAR_UNAME", file_hdr->uname, 1);
setenv("TAR_GNAME", file_hdr->gname, 1);
sprintf(buf, "%0o", (int)file_hdr->mtime);
setenv("TAR_MTIME", buf, 1);
sprintf(buf, "%0o", file_hdr->uid);
setenv("TAR_UID", buf, 1);
sprintf(buf, "%0o", file_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
copy_in_out(tar->src_fd, pipefd[1], file_hdr->size);
tar->offset += file_hdr->size;
xclose(pipefd[1]);
waitpid(cpid, &status, 0);
if (WIFSIGNALED(status))
xprintf("tar : %d: child returned %d\n", cpid, WTERMSIG(status));
}
}
static void extract_to_disk(struct archive_handler *tar)
{
int flags, dst_fd = -1;
char *s;
struct stat ex;
struct file_header *file_hdr = &tar->file_hdr;
flags = strlen(file_hdr->name);
if (flags>2) {
if (strstr(file_hdr->name, "/../") || !strcmp(file_hdr->name, "../") ||
!strcmp(file_hdr->name+flags-3, "/.."))
{
error_msg("drop %s", file_hdr->name);
}
}
if (file_hdr->name[flags-1] == '/') file_hdr->name[flags-1] = 0;
//Regular file with preceding path
if ((s = strrchr(file_hdr->name, '/'))) {
if (mkpathat(AT_FDCWD, file_hdr->name, 00, 2) && errno !=EEXIST) {
error_msg(":%s: not created", file_hdr->name);
return;
}
}
//remove old file, if exists
if (!(toys.optflags & FLAG_k) && !S_ISDIR(file_hdr->mode)
&& !lstat( file_hdr->name, &ex)) {
if (unlink(file_hdr->name)) {
perror_msg("can't remove: %s",file_hdr->name);
}
}
//hard link
if (S_ISREG(file_hdr->mode) && file_hdr->link_target) {
if (link(file_hdr->link_target, file_hdr->name))
perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
goto COPY;
}
switch (file_hdr->mode & S_IFMT) {
case S_IFREG:
flags = O_WRONLY|O_CREAT|O_EXCL;
if (toys.optflags & FLAG_overwrite) flags = O_WRONLY|O_CREAT|O_TRUNC;
dst_fd = open(file_hdr->name, flags, file_hdr->mode & 07777);
if (dst_fd == -1) perror_msg("%s: can't open", file_hdr->name);
break;
case S_IFDIR:
if ((mkdir(file_hdr->name, file_hdr->mode) == -1) && errno != EEXIST)
perror_msg("%s: can't create", file_hdr->name);
break;
case S_IFLNK:
if (symlink(file_hdr->link_target, file_hdr->name))
perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
break;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
if (mknod(file_hdr->name, file_hdr->mode, file_hdr->device))
perror_msg("can't create '%s'", file_hdr->name);
break;
default:
printf("type not yet supported\n");
break;
}
//copy file....
COPY:
copy_in_out(tar->src_fd, dst_fd, file_hdr->size);
tar->offset += file_hdr->size;
close(dst_fd);
if (S_ISLNK(file_hdr->mode)) return;
if (!(toys.optflags & FLAG_o)) {
//set ownership..., --no-same-owner, --numeric-owner
uid_t u = file_hdr->uid;
gid_t g = file_hdr->gid;
if (!(toys.optflags & FLAG_numeric_owner)) {
struct group *gr = getgrnam(file_hdr->gname);
struct passwd *pw = getpwnam(file_hdr->uname);
if (pw) u = pw->pw_uid;
if (gr) g = gr->gr_gid;
}
if (chown(file_hdr->name, u, g))
perror_msg("chown %d:%d '%s'", u, g, file_hdr->name);;
}
if (toys.optflags & FLAG_p) // || !(toys.optflags & FLAG_no_same_permissions))
chmod(file_hdr->name, file_hdr->mode);
//apply mtime
if (!(toys.optflags & FLAG_m)) {
struct timeval times[2] = {{file_hdr->mtime, 0},{file_hdr->mtime, 0}};
utimes(file_hdr->name, times);
}
}
static void add_to_list(struct arg_list **llist, char *name)
{
struct arg_list **list = llist;
while (*list) list=&((*list)->next);
*list = xzalloc(sizeof(struct arg_list));
(*list)->arg = name;
if ((name[strlen(name)-1] == '/') && strlen(name) != 1)
name[strlen(name)-1] = '\0';
}
static void add_from_file(struct arg_list **llist, struct arg_list *flist)
{
char *line = NULL;
while (flist) {
int fd = 0;
if (strcmp((char *)flist->arg, "-"))
fd = xopen((char *)flist->arg, O_RDONLY);
while ((line = get_line(fd))) {
add_to_list(llist, line);
}
if (fd) close(fd);
flist = flist->next;
}
}
static struct archive_handler *init_handler()
{
struct archive_handler *tar_hdl = xzalloc(sizeof(struct archive_handler));
tar_hdl->extract_handler = extract_to_disk;
return tar_hdl;
}
//convert octal to int
static int otoi(char *str, int len)
{
long val;
char *endp, inp[len+1]; //1 for NUL termination
memcpy(inp, str, len);
inp[len] = '\0'; //nul-termination made sure
val = strtol(inp, &endp, 8);
if (*endp && *endp != ' ') error_exit("invalid param");
return (int)val;
}
static void extract_stream(struct archive_handler *tar_hdl)
{
int pipefd[2];
pid_t cpid;
if (pipe(pipefd) == -1) error_exit("pipe");
cpid = fork();
if (cpid == -1) perror_exit("fork");
if (!cpid) { /* Child reads from pipe */
char *argv[] = {"gunzip", "-cf", "-", NULL};
xclose(pipefd[0]); /* Close unused read*/
dup2(tar_hdl->src_fd, 0);
dup2(pipefd[1], 1); //write to pipe
xexec(argv);
} else {
xclose(pipefd[1]); /* Close unused read end */
dup2(pipefd[0], tar_hdl->src_fd); //read from pipe
}
}
static char *process_extended_hdr(struct archive_handler *tar, int size)
{
char *value = NULL, *p, *buf = xzalloc(size+1);
if (readall(tar->src_fd, buf, size) != size) error_exit("short read");
buf[size] = 0;
tar->offset += size;
p = buf;
while (size) {
char *key;
int len, n;
// extended records are of the format: "LEN NAME=VALUE\n"
sscanf(p, "%d %n", &len, &n);
key = p + n;
p += len;
size -= len;
p[-1] = 0;
if (size < 0) {
error_msg("corrupted extended header");
break;
}
len = strlen("path=");
if (!strncmp(key, "path=", len)) {
value = key + strlen("path=");
break;
}
}
if (value) value = xstrdup(value);
free(buf);
return value;
}
static void tar_skip(struct archive_handler *tar, int sz)
{
int x;
while ((x = lskip(tar->src_fd, sz))) {
tar->offset += sz - x;
sz = x;
}
tar->offset += sz;
}
static void unpack_tar(struct archive_handler *tar_hdl)
{
struct tar_hdr tar;
struct file_header *file_hdr;
int i, j, maj, min, sz, e = 0;
unsigned int cksum;
unsigned char *gzMagic;
char *longname = NULL, *longlink = NULL;
while (1) {
cksum = 0;
if (tar_hdl->offset % 512) {
sz = 512 - tar_hdl->offset % 512;
tar_skip(tar_hdl, sz);
}
i = readall(tar_hdl->src_fd, &tar, 512);
tar_hdl->offset += i;
if (i != 512) {
if (i >= 2) goto CHECK_MAGIC; //may be a small (<512 byte)zipped file
error_exit("read error");
}
if (!tar.name[0]) {
if (e) return; //end of tar 2 empty blocks
e = 1;//empty jump to next block
continue;
}
if (strncmp(tar.magic, "ustar", 5)) {
//try detecting by reading magic
CHECK_MAGIC:
gzMagic = (unsigned char*)&tar;
if ((gzMagic[0] == 0x1f) && (gzMagic[1] == 0x8b)
&& !lseek(tar_hdl->src_fd, -i, SEEK_CUR)) {
tar_hdl->offset -= i;
extract_stream(tar_hdl);
continue;
}
error_exit("invalid tar format");
}
for (j = 0; j<148; j++) cksum += (unsigned int)((char*)&tar)[j];
for (j = 156; j<500; j++) cksum += (unsigned int)((char*)&tar)[j];
//cksum field itself treated as ' '
for ( j= 0; j<8; j++) cksum += (unsigned int)' ';
if (cksum != otoi(tar.chksum, sizeof(tar.chksum))) error_exit("wrong cksum");
file_hdr = &tar_hdl->file_hdr;
memset(file_hdr, 0, sizeof(struct file_header));
file_hdr->mode = otoi(tar.mode, sizeof(tar.mode));
file_hdr->uid = otoi(tar.uid, sizeof(tar.uid));
file_hdr->gid = otoi(tar.gid, sizeof(tar.gid));
file_hdr->size = otoi(tar.size, sizeof(tar.size));
file_hdr->mtime = otoi(tar.mtime, sizeof(tar.mtime));
file_hdr->uname = xstrdup(tar.uname);
file_hdr->gname = xstrdup(tar.gname);
maj = otoi(tar.major, sizeof(tar.major));
min = otoi(tar.minor, sizeof(tar.minor));
file_hdr->device = dev_makedev(maj, min);
if (tar.type <= '7') {
if (tar.link[0]) {
sz = sizeof(tar.link);
file_hdr->link_target = xmalloc(sz + 1);
memcpy(file_hdr->link_target, tar.link, sz);
file_hdr->link_target[sz] = '\0';
}
file_hdr->name = xzalloc(256);// pathname supported size
if (tar.prefix[0]) {
memcpy(file_hdr->name, tar.prefix, sizeof(tar.prefix));
sz = strlen(file_hdr->name);
if (file_hdr->name[sz-1] != '/') file_hdr->name[sz] = '/';
}
sz = strlen(file_hdr->name);
memcpy(file_hdr->name + sz, tar.name, sizeof(tar.name));
if (file_hdr->name[255]) error_exit("filename too long");
}
switch (tar.type) {
// case '\0':
case '0':
case '7':
case '1': //Hard Link
file_hdr->mode |= S_IFREG;
break;
case '2':
file_hdr->mode |= S_IFLNK;
break;
case '3':
file_hdr->mode |= S_IFCHR;
break;
case '4':
file_hdr->mode |= S_IFBLK;
break;
case '5':
file_hdr->mode |= S_IFDIR;
break;
case '6':
file_hdr->mode |= S_IFIFO;
break;
case 'K':
longlink = xzalloc(file_hdr->size +1);
xread(tar_hdl->src_fd, longlink, file_hdr->size);
tar_hdl->offset += file_hdr->size;
continue;
case 'L':
free(longname);
longname = xzalloc(file_hdr->size +1);
xread(tar_hdl->src_fd, longname, file_hdr->size);
tar_hdl->offset += file_hdr->size;
continue;
case 'D':
case 'M':
case 'N':
case 'S':
case 'V':
case 'g': // pax global header
tar_skip(tar_hdl, file_hdr->size);
continue;
case 'x': // pax extended header
free(longname);
longname = process_extended_hdr(tar_hdl, file_hdr->size);
continue;
default: break;
}
if (longname) {
free(file_hdr->name);
file_hdr->name = longname;
longname = NULL;
}
if (longlink) {
free(file_hdr->link_target);
file_hdr->link_target = longlink;
longlink = NULL;
}
if ((file_hdr->mode & S_IFREG) &&
file_hdr->name[strlen(file_hdr->name)-1] == '/') {
file_hdr->name[strlen(file_hdr->name)-1] = '\0';
file_hdr->mode &= ~S_IFREG;
file_hdr->mode |= S_IFDIR;
}
if ((file_hdr->link_target && *(file_hdr->link_target))
|| S_ISLNK(file_hdr->mode) || S_ISDIR(file_hdr->mode))
file_hdr->size = 0;
if (filter(TT.exc, file_hdr->name) ||
(TT.inc && !filter(TT.inc, file_hdr->name))) goto SKIP;
add_to_list(&TT.pass, xstrdup(file_hdr->name));
if (toys.optflags & FLAG_t) {
if (toys.optflags & FLAG_v) {
char perm[11];
struct tm *lc = localtime((const time_t*)&(file_hdr->mtime));
mode_to_string(file_hdr->mode, perm);
printf("%s %s/%s %9ld %d-%02d-%02d %02d:%02d:%02d ",perm,file_hdr->uname,
file_hdr->gname, (long)file_hdr->size, 1900+lc->tm_year,
1+lc->tm_mon, lc->tm_mday, lc->tm_hour, lc->tm_min, lc->tm_sec);
}
printf("%s",file_hdr->name);
if (file_hdr->link_target) printf(" -> %s",file_hdr->link_target);
xputc('\n');
SKIP:
tar_skip(tar_hdl, file_hdr->size);
} else {
if (toys.optflags & FLAG_v) printf("%s\n",file_hdr->name);
tar_hdl->extract_handler(tar_hdl);
}
free(file_hdr->name);
free(file_hdr->link_target);
free(file_hdr->uname);
free(file_hdr->gname);
}
}
void tar_main(void)
{
struct archive_handler *tar_hdl;
int fd = 0;
struct arg_list *tmp;
char **args = toys.optargs;
if (!geteuid()) toys.optflags |= FLAG_p;
for (tmp = TT.exc; tmp; tmp = tmp->next)
tmp->arg = xstrdup(tmp->arg); //freeing at the end fails otherwise
while(*args) add_to_list(&TT.inc, xstrdup(*args++));
if (toys.optflags & FLAG_X) add_from_file(&TT.exc, TT.exc_file);
if (toys.optflags & FLAG_T) add_from_file(&TT.inc, TT.inc_file);
if (toys.optflags & FLAG_c) {
if (!TT.inc) error_exit("empty archive");
fd = 1;
}
if ((toys.optflags & FLAG_f) && strcmp(TT.fname, "-"))
fd = xcreate(TT.fname, fd*(O_WRONLY|O_CREAT|O_TRUNC), 0666);
if (toys.optflags & FLAG_C) xchdir(TT.dir);
tar_hdl = init_handler();
tar_hdl->src_fd = fd;
if ((toys.optflags & FLAG_x) || (toys.optflags & FLAG_t)) {
if (toys.optflags & FLAG_O) tar_hdl->extract_handler = extract_to_stdout;
if (toys.optflags & FLAG_to_command) {
signal(SIGPIPE, SIG_IGN); //will be using pipe between child & parent
tar_hdl->extract_handler = extract_to_command;
}
if (toys.optflags & FLAG_z) extract_stream(tar_hdl);
unpack_tar(tar_hdl);
for (tmp = TT.inc; tmp; tmp = tmp->next)
if (!filter(TT.exc, tmp->arg) && !filter(TT.pass, tmp->arg))
error_msg("'%s' not in archive", tmp->arg);
} else if (toys.optflags & FLAG_c) {
//create the tar here.
if (toys.optflags & FLAG_z) compress_stream(tar_hdl);
for (tmp = TT.inc; tmp; tmp = tmp->next) {
TT.handle = tar_hdl;
//recurse thru dir and add files to archive
dirtree_flagread(tmp->arg, DIRTREE_SYMFOLLOW*!!(toys.optflags&FLAG_h),
add_to_tar);
}
memset(toybuf, 0, 1024);
writeall(tar_hdl->src_fd, toybuf, 1024);
seen_inode(&TT.inodes, 0, 0);
}
if (CFG_TOYBOX_FREE) {
close(tar_hdl->src_fd);
free(tar_hdl);
llist_traverse(TT.exc, llist_free_arg);
llist_traverse(TT.inc, llist_free_arg);
llist_traverse(TT.pass, llist_free_arg);
}
}