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-rw-r--r--lib/lib.h2
-rw-r--r--lib/xwrap.c21
-rw-r--r--toys/posix/tar.c95
3 files changed, 96 insertions, 22 deletions
diff --git a/lib/lib.h b/lib/lib.h
index 7572a8a3..707e388c 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -234,7 +234,7 @@ void loopfiles_rw(char **argv, int flags, int permissions,
void (*function)(int fd, char *name));
void loopfiles(char **argv, void (*function)(int fd, char *name));
void loopfiles_lines(char **argv, void (*function)(char **pline, long len));
-long long sendfile_len(int in, int out, long long len);
+long long sendfile_len(int in, int out, long long len, long long *consumed);
long long xsendfile_len(int in, int out, long long len);
void xsendfile_pad(int in, int out, long long len);
long long xsendfile(int in, int out);
diff --git a/lib/xwrap.c b/lib/xwrap.c
index a242cd53..e4f8f013 100644
--- a/lib/xwrap.c
+++ b/lib/xwrap.c
@@ -805,20 +805,22 @@ void xpidfile(char *name)
}
// Return bytes copied from in to out. If bytes <0 copy all of in to out.
-long long sendfile_len(int in, int out, long long bytes)
+// If consuemd isn't null, amount read saved there (return is written or error)
+long long sendfile_len(int in, int out, long long bytes, long long *consumed)
{
- long long total = 0;
- long len;
+ long long total = 0, len;
+ if (consumed) *consumed = 0;
if (in<0) return 0;
- for (;;) {
- if (bytes == total) break;
+ while (bytes != total) {
len = bytes-total;
if (bytes<0 || len>sizeof(libbuf)) len = sizeof(libbuf);
- len = xread(in, libbuf, len);
+ len = read(in, libbuf, len);
+ if (!len && errno==EAGAIN) continue;
if (len<1) break;
- xwrite(out, libbuf, len);
+ if (consumed) *consumed += len;
+ if (writeall(out, libbuf, len) != len) return -1;
total += len;
}
@@ -828,9 +830,10 @@ long long sendfile_len(int in, int out, long long bytes)
// error_exit if we couldn't copy all bytes
long long xsendfile_len(int in, int out, long long bytes)
{
- long long len = sendfile_len(in, out, bytes);
+ long long len = sendfile_len(in, out, bytes, 0);
- if (bytes != -1 && bytes != len) error_exit("short file");
+ if (bytes != -1 && bytes != len)
+ error_exit("short %s", (len<0) ? "write" : "read");
return len;
}
diff --git a/toys/posix/tar.c b/toys/posix/tar.c
index c073bbe6..656bbc58 100644
--- a/toys/posix/tar.c
+++ b/toys/posix/tar.c
@@ -18,7 +18,7 @@
* 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))
+USE_TAR(NEWTOY(tar, "&(sparse)(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"
@@ -50,7 +50,8 @@ GLOBALS(
struct double_list *incl, *excl, *seen;
struct string_list *dirs;
char *cwd;
- int fd, ouid, ggid, hlc, warn, adev, aino;
+ int fd, ouid, ggid, hlc, warn, adev, aino, sparselen;
+ long long *sparse;
time_t mtt;
// hardlinks seen so far (hlc many)
@@ -363,6 +364,45 @@ static int dirflush(char *name)
return 0;
}
+// write data to file
+static void sendfile_sparse(int fd)
+{
+ long long len, used = 0, sent;
+ int i = 0, j;
+
+ for (;;) {
+ if (TT.sparselen) {
+ if (!TT.sparse[i*2+1]) continue;
+ // Seek past holes or fill output with zeroes.
+ if (-1 == lseek(fd, len = TT.sparse[i*2], SEEK_SET)) {
+ sent = 0;
+ while (len) {
+ // first/last 512 bytes used, rest left zeroes
+ j = (len>3072) ? 3072 : len;
+ if (len != writeall(fd, toybuf+512, len)) goto error;
+ len -= j;
+ }
+ }
+ len = TT.sparse[i*2+1];
+ if (len+used>TT.hdr.size) error_exit("sparse overflow");
+ } else len = TT.hdr.size;
+
+ len -= sendfile_len(TT.fd, fd, len, &sent);
+ used += sent;
+ if (len) {
+error:
+ perror_msg(0);
+ skippy(TT.hdr.size-used);
+
+ break;
+ }
+
+ if (++i >= TT.sparselen) break;
+ }
+
+ close(fd);
+}
+
static void extract_to_disk(void)
{
char *name = TT.hdr.name;
@@ -391,10 +431,8 @@ static void extract_to_disk(void)
} 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);
- }
+ if (fd != -1) sendfile_sparse(fd);
+ else skippy(TT.hdr.size);
}
} else if (S_ISDIR(ala)) {
if ((mkdir(name, 0700) == -1) && errno != EEXIST)
@@ -478,7 +516,7 @@ static void unpack_tar(struct tar_hdr *first)
TT.hdr.size = OTOI(tar.size);
// If this header isn't writing something to the filesystem
- if (tar.type<'0' || tar.type>'7') {
+ if ((tar.type<'0' || tar.type>'7') && tar.type!='S') {
// Long name extension header?
if (tar.type == 'K') alloread(&TT.hdr.link_target, TT.hdr.size);
@@ -509,9 +547,42 @@ static void unpack_tar(struct tar_hdr *first)
continue;
}
+ // Handle sparse file type
+ if (tar.type == 'S') {
+ char sparse[512];
+ int max = 8;
+
+ // Load 4 pairs of offset/len from S block, plus 21 pairs from each
+ // continuation block, list says where to seek/write sparse file contents
+ TT.sparselen = 0;
+ s = 386+(char *)&tar;
+ *sparse = i = 0;
+
+ for (;;) {
+ if (!(TT.sparselen&511))
+ TT.sparse = xrealloc(TT.sparse, (TT.sparselen*512)*sizeof(long));
+
+ // If out of data in block check continue flag, stop or load next block
+ if (++i>max || !*s) {
+ if (!(*sparse ? sparse[504] : ((char *)&tar)[482])) break;
+ xreadall(TT.fd, s = sparse, 512);
+ max = 42;
+ i = 0;
+ }
+
+ // Load next entry
+ TT.sparse[TT.sparselen++] = otoi(s, 12);
+ s += 12;
+ }
+
+ // Odd number of entries (from corrupted tar) would be dropped here
+ TT.sparselen /= 2;
+ } else TT.sparselen = 0;
+
// 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;
+ if (tar.type == 'S') TT.hdr.mode |= 0x8000;
+ else 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);
@@ -538,7 +609,7 @@ static void unpack_tar(struct tar_hdr *first)
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));
+ i = (tar.type=='S') ? 0 : 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);
@@ -596,7 +667,7 @@ static void unpack_tar(struct tar_hdr *first)
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);
+ if (FLAG(O)) sendfile_sparse(1);
else if (FLAG(to_command)) {
if (S_ISREG(TT.hdr.mode)) {
int fd, pid;
@@ -613,8 +684,8 @@ static void unpack_tar(struct tar_hdr *first)
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);
+ sendfile_sparse(fd);
+ fd = xpclose_both(pid, 0);
if (fd) error_msg("%d: Child returned %d", pid, fd);
}
} else extract_to_disk();
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 04:02:23 +0000