git/get-tar-commit-id.c
Rene Scharfe 87fec8fc9e [PATCH] GIT: Create tar archives of tree on the fly
Write commit ID to global extended pax header at the beginning of the tar
file, if possible.  get-tar-commit-id.c is an example program to get the
ID back out of such a tar archive.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-29 19:51:04 -07:00

28 lines
472 B
C

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define HEADERSIZE 1024
int main(int argc, char **argv)
{
char buffer[HEADERSIZE];
ssize_t n;
n = read(0, buffer, HEADERSIZE);
if (n < HEADERSIZE) {
fprintf(stderr, "read error\n");
return 3;
}
if (buffer[156] != 'g')
return 1;
if (memcmp(&buffer[512], "52 comment=", 11))
return 1;
n = write(1, &buffer[523], 41);
if (n < 41) {
fprintf(stderr, "write error\n");
return 2;
}
return 0;
}