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-rw-r--r--toys/pending/tar.c814
1 files changed, 0 insertions, 814 deletions
diff --git a/toys/pending/tar.c b/toys/pending/tar.c
deleted file mode 100644
index f31b5f2b..00000000
--- a/toys/pending/tar.c
+++ /dev/null
@@ -1,814 +0,0 @@
-/* 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, "&(restrict)(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(xz)j(bzip2)z(gzip)O(to-stdout)m(touch)X(exclude-from)*T(files-from)*C(directory):f(file):a[!txc][!jzJa]", TOYFLAG_USR|TOYFLAG_BIN))
-
-config TAR
- bool "tar"
- default n
- help
- usage: tar [-cxtfvohmjkO] [-XT 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
- --restrict All archive contents must extract under a single subdirctory.
-*/
-
-#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 from 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;
-}
-#define OTOI(x) otoi(x, sizeof(x))
-
-// 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)
- // constant is FNM_LEADING_DIR
- 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;
-}
-
-// callback from dirtree to create archive
-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;) {
- if (filter(TT.excl, p)) goto done;
- while (*p && *p!='/') p++;
- while (*p=='/') p++;
- }
-
- // Consume the 1 extra byte alocated in 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);
-}
-
-static void wsettime(char *s, long long sec)
-{
- struct timespec times[2] = {{sec, 0},{sec, 0}};
-
- if (utimensat(AT_FDCWD, s, times, AT_SYMLINK_NOFOLLOW))
- perror_msg("settime %lld %s", sec, s);
-}
-
-// Do pending directory utimes(), NULL to flush all.
-static int dirflush(char *name)
-{
- char *s = 0, *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;
- }
-
- if (FLAG(restrict)) {
- free(TT.cwd);
- TT.cwd = strdup(s);
- toys.optflags ^= FLAG_restrict;
- }
- }
-
- // 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) {
-
- // If next file is under (or equal to) this dir, keep waiting
- if (name && strstart(&ss, ss = s) && (!*ss || *ss=='/')) break;
-
- wsettime(TT.dirs->str+sizeof(long long), *(long long *)TT.dirs->str);
- 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);;
- }
-
- if (!S_ISLNK(ala)) chmod(TT.hdr.name, FLAG(p) ? ala : ala&0777);
-
- // 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 wsettime(TT.hdr.name, TT.hdr.mtime);
- }
-}
-
-static void unpack_tar(struct tar_hdr *first)
-{
- struct double_list *walk, *delete;
- struct tar_hdr tar;
- int i, and = 0;
- unsigned maj, min;
- char *s;
-
- for (;;) {
- if (first) {
- memcpy(&tar, first, i = 512);
- first = 0;
- } else {
- // 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("short header");
-
- // Two consecutive empty headers ends tar even if there's more data
- if (!i || !*tar.name) {
- if (!i || and++) 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)) error_exit("bad cksum");
- TT.hdr.size = OTOI(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);
- TT.hdr.mode |= (char []){8,8,10,2,6,4,1,8}[tar.type-'0']<<12;
- TT.hdr.uid = OTOI(tar.uid);
- TT.hdr.gid = OTOI(tar.gid);
- TT.hdr.mtime = OTOI(tar.mtime);
- maj = OTOI(tar.major);
- min = OTOI(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, 1, TT.hdr.size);
- else if (FLAG(to_command)) {
- if (S_ISREG(TT.hdr.mode)) {
- int fd, pid;
-
- xsetenv("TAR_FILETYPE", "f");
- xsetenv(xmprintf("TAR_MODE=%o", TT.hdr.mode), 0);
- xsetenv(xmprintf("TAR_SIZE=%lld", TT.hdr.size), 0);
- xsetenv("TAR_FILENAME", TT.hdr.name);
- xsetenv("TAR_UNAME", TT.hdr.uname);
- xsetenv("TAR_GNAME", TT.hdr.gname);
- xsetenv(xmprintf("TAR_MTIME=%llo", (long long)TT.hdr.mtime), 0);
- xsetenv(xmprintf("TAR_UID=%o", TT.hdr.uid), 0);
- xsetenv(xmprintf("TAR_GID=%o", TT.hdr.gid), 0);
-
- pid = xpopen((char *[]){"sh", "-c", TT.to_command, NULL}, &fd, 0);
- // todo: short write exits tar here, other skips data.
- xsendfile_len(TT.fd, fd, TT.hdr.size);
- fd = xpclose(pid, fd);
- if (fd) error_msg("%d: Child returned %d", pid, fd);
- }
- } 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 (minus trailing \n and /) to dlist **
-static void trim2list(void *list, char *pline)
-{
- char *n = xstrdup(pline);
- int i = strlen(n);
-
- dlist_add(list, n);
- if (i && n[i-1]=='\n') i--;
- while (i && n[i-1] == '/') i--;
- n[i] = 0;
-}
-
-// do_lines callback, selects TT.incl or TT.excl based on call order
-static void do_XT(char **pline, long len)
-{
- if (pline) trim2list(TT.X ? &TT.excl : &TT.incl, *pline);
-}
-
-void tar_main(void)
-{
- char *s, **args = toys.optargs;
- int len = 0;
-
- // Needed when extracting to command
- signal(SIGPIPE, SIG_IGN);
-
- // Get possible early errors out of the way
- 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.
- for (; TT.exclude; TT.exclude = TT.exclude->next)
- trim2list(&TT.excl, TT.exclude->arg);
- for (;TT.X; TT.X = TT.X->next) do_lines(xopenro(TT.X->arg), '\n', do_XT);
- for (args = toys.optargs; *args; args++) trim2list(&TT.incl, *args);
- for (;TT.T; TT.T = TT.T->next) do_lines(xopenro(TT.T->arg), '\n', do_XT);
-
- // If include file list empty, don't create empty archive
- if (FLAG(c)) {
- if (!TT.incl) error_exit("empty archive");
- TT.fd = 1;
- }
-
- // nommu reentry for nonseekable input skips this, parent did it for us
- if (toys.stacktop) {
- if (TT.f && strcmp(TT.f, "-"))
- TT.fd = xcreate(TT.f, TT.fd*(O_WRONLY|O_CREAT|O_TRUNC), 0666);
- // Get destination directory
- if (TT.C) xchdir(TT.C);
- }
-
- // Get destination directory
- TT.cwd = xabspath(s = xgetcwd(), 1);
- free(s);
-
- // Remember archive inode
- {
- struct stat st;
-
- if (!fstat(TT.fd, &st)) {
- TT.aino = st.st_ino;
- TT.adev = st.st_dev;
- }
- }
-
- // Are we reading?
- if (FLAG(x)||FLAG(t)) {
- struct tar_hdr *hdr = 0;
-
- // autodetect compression type when not specified
- if (!(FLAG(j)||FLAG(z)||FLAG(J))) {
- len = xread(TT.fd, hdr = (void *)(toybuf+sizeof(toybuf)-512), 512);
- if (len!=512 || strncmp("ustar", hdr->magic, 5)) {
- // detect gzip and bzip signatures
- if (SWAP_BE16(*(short *)hdr)==0x1f8b) toys.optflags |= FLAG_z;
- else if (!memcmp(hdr->name, "BZh", 3)) toys.optflags |= FLAG_j;
- else if (peek_be(hdr->name, 7) == 0xfd377a585a0000)
- toys.optflags |= FLAG_J;
- else error_exit("Not tar");
-
- // if we can seek back we don't need to loop and copy data
- if (!lseek(TT.fd, -len, SEEK_CUR)) hdr = 0;
- }
- }
-
- if (FLAG(j)||FLAG(z)||FLAG(J)) {
- int pipefd[2] = {hdr ? -1 : TT.fd, -1}, i, pid;
- char *cmd[] = {"bzcat", 0};
-
- if (FLAG(J)) cmd[0] = "xzcat";
- else if FLAG(z) cmd[0]++;
- xpopen_both(cmd, pipefd);
-
- if (!hdr) {
- // If we could seek, child gzip inherited fd and we read its output
- close(TT.fd);
- TT.fd = pipefd[1];
-
- } else {
-
- // If we autodetected type but then couldn't lseek to put the data back
- // we have to loop reading data from TT.fd and pass it to gzip ourselves
- // (starting with the block of data we read to autodetect).
-
- // dirty trick: move gzip input pipe to stdin so child closes spare copy
- dup2(pipefd[0], 0);
- if (pipefd[0]) close(pipefd[0]);
-
- // Fork a copy of ourselves to handle extraction (reads from zip output
- // pipe, writes to stdout).
- pipefd[0] = pipefd[1];
- pipefd[1] = 1;
- pid = xpopen_both(0, pipefd);
- close(pipefd[1]);
-
- // loop writing collated data to zip proc
- xwrite(0, hdr, len);
- for (;;) {
- if ((i = read(TT.fd, toybuf, sizeof(toybuf)))<1) {
- close(0);
- xwaitpid(pid);
- return;
- }
- xwrite(0, toybuf, i);
- }
- }
- }
-
- unpack_tar(hdr);
- dirflush(0);
-
- // Each time a TT.incl entry is seen it's moved to the end of the list,
- // with TT.seen pointing to first seen list entry. Anything between
- // TT.incl and TT.seen wasn't encountered in archive..
- 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;
-
- // autodetect compression type based on -f name. (Use > to avoid.)
- if (TT.f && !FLAG(j) && !FLAG(z)) {
- char *tbz[] = {".tbz", ".tbz2", ".tar.bz", ".tar.bz2"};
- if (strend(TT.f, ".tgz") || strend(TT.f, ".tar.gz"))
- toys.optflags |= FLAG_z;
- if (strend(TT.f, ".txz") || strend(TT.f, ".tar.xz"))
- toys.optflags |= FLAG_J;
- else for (len = 0; len<ARRAY_LEN(tbz); len++)
- if (strend(TT.f, tbz[len])) toys.optflags |= FLAG_j;
- }
-
- if (FLAG(j)||FLAG(z)||FLAG(J)) {
- int pipefd[2] = {-1, TT.fd};
-
- xpopen_both((char *[]){FLAG(z)?"gzip":FLAG(J)?"xz":"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) {
- llist_traverse(TT.excl, llist_free_double);
- llist_traverse(TT.incl, llist_free_double);
- while(TT.hlc) free(TT.hlx[--TT.hlc].arg);
- free(TT.hlx);
- free(TT.cwd);
- close(TT.fd);
- }
-}