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#! /usr/bin/env pike
//
// Filters a tar file applying root/root ownership.
//
void copydata(Stdio.File in, Stdio.File out, int size)
{
while(size>0) {
string s = in->read((size>8192? 8192 : size));
if(s == "") {
werror("READ ERROR on input\n");
exit(1);
}
out->write(s);
size -= sizeof(s);
}
}
void doit(Stdio.File in, Stdio.File out)
{
int written;
for(;;) {
string s = in->read(512);
if(s == "")
break;
if(sizeof(s) != 512) {
werror("READ ERROR on input\n");
exit(1);
}
if(s == "\0"*512) {
written += out->write(s);
break;
}
array a =
array_sscanf(s, "%100s%8s%8s%8s%12s%12s%8s%c%100s%8s%32s%32s%8s%8s");
int csum, size, perm;
sscanf(a[1], "%o", perm);
sscanf(a[4], "%o", size);
sscanf(a[6], "%o", csum);
//werror("%O (%d bytes, 0%03o) csum:%d\n", a[0], size, perm, csum);
s=s[..147]+" "+s[156..];
if(`+(@values(s[..511])) != csum) {
werror("CHECKSUM ERROR on input (got %d, expected %d(%s))!\n",
`+(@values(s[..511])), csum, a[6]);
werror("%{ %{%02x %}\n%}", ({(((array)s)/16)[*]}));
exit(1);
}
/* Normalize the permission flags. */
perm &= 0x3f1ff;
if (perm & 0444) perm |= 0444; /* Propagate r. */
if (perm & 0111) perm |= 0111; /* Propagate x. */
a[1] = sprintf("%6o \0", perm);
a[2] = " 0 \0";
a[3] = " 0 \0";
if((a[9]/"\0")[0]-" " == "ustar") {
a[10] = "root\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
a[11] = "root\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
}
a[6] = " ";
s = sprintf("%100s%8s%8s%8s%12s%12s%8s%c%100s%8s%32s%32s%8s%8s", @a)+
s[345..];
written +=
out->write(s[..147]+sprintf("%07o\0", `+(@values(s[..511])))+s[156..]);
size = (size + 511) & -512;
copydata(in, out, size);
written += size;
}
// tar on AIX 5L 5.1.0.0/ia64 pads with junk
for(;;) {
string s = in->read(512);
if(s == "")
break;
if(sizeof(s) != 512) {
werror("READ ERROR on input\n");
exit(1);
}
written += out->write("\0"*512);
}
// GNU tar 1.14 complains if we don't pad to an even 20 of blocks.
if (written % 10240) {
out->write("\0" * (10240 - (written % 10240)));
}
}
int main(int argc, array(string) argv)
{
Stdio.File s = Stdio.File("stdin");
Stdio.File d = Stdio.File("stdout");
if(argc == 3)
{
s = Stdio.File(argv[1], "r");
d = Stdio.File(argv[2]+".tmp", "cwt");
}
doit(s, d);
if(argc == 3)
{
d->close();
s->close();
if(!mv(argv[2]+".tmp", argv[2]))
{
werror("FATAL! mv(%O, %O) failed.", argv[2], argv[2]);
exit(1);
}
}
return 0;
}
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