bootstrap-initrd

ln-stub.c (865B)

#define _POSIX_C_SOURCE 200809L
#include <stdio.h> // fprintf
#include <unistd.h> // getopt, symlink, link
#include <string.h> // strerror
#include <errno.h>
#include <stdbool.h>
int
main(int argc, char *argv[])
{
	bool opt_s = false;
	int c = -1;
	while((c = getopt(argc, argv, ":s")) != -1)
	{
		switch(c)
		{
		case 's':
			opt_s = true;
			break;
		case '?':
			fprintf(stderr, "ln: Unknown option '-%c'\n", optopt);
			break;
		}
	}
	argc -= optind;
	argv += optind;
	if(argc != 2)
	{
		fprintf(stderr, "Usage: ln [-s] src dest\n");
		return 1;
	}
	if(opt_s)
	{
		if(symlink(argv[0], argv[1]) < 0)
		{
			fprintf(stderr, "ln: Failed creating symlink: %s\n", strerror(errno));
			return 1;
		}
	}
	else
	{
		if(link(argv[0], argv[1]) < 0)
		{
			fprintf(stderr, "ln: Failed creating (hard) link: %s\n", strerror(errno));
			return 1;
		}
	}
	return 0;
}