sortix--sortix/utils/unmount.c

/*
 * Copyright (c) 2014 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * unmount.c
 * Unmount a filesystem.
 */

#include <sys/mount.h>

#include <err.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void compact_arguments(int* argc, char*** argv)
{
	for ( int i = 0; i < *argc; i++ )
	{
		while ( i < *argc && !(*argv)[i] )
		{
			for ( int n = i; n < *argc; n++ )
				(*argv)[n] = (*argv)[n+1];
			(*argc)--;
		}
	}
}

int main(int argc, char* argv[])
{
	setlocale(LC_ALL, "");

	bool force = false;
	bool lazy = false;

	for ( int i = 1; i < argc; i++ )
	{
		const char* arg = argv[i];
		if ( arg[0] != '-' || !arg[1] )
			continue;
		argv[i] = NULL;
		if ( !strcmp(arg, "--") )
			break;
		if ( arg[1] != '-' )
		{
			char c;
			while ( (c = *++arg) ) switch ( c )
			{
			case 'f': force = true; break;
			case 'l': lazy = true; break;
			default:
				errx(1, "unknown option -- '%c'", c);
			}
		}
		else if ( !strcmp(arg, "--force") )
			force = true;
		else if ( !strcmp(arg, "--lazy") )
			lazy = true;
		else
			errx(1, "unknown option: %s", arg);
	}

	compact_arguments(&argc, &argv);

	int flags = 0;
	if ( flags & force )
		flags |= UNMOUNT_FORCE;
	if ( flags & lazy )
		flags |= UNMOUNT_DETACH;

	for ( int i = 1; i < argc; i++ )
	{
		const char* path = argv[i];
		if ( unmount(path, flags) < 0 )
			err(1, "%s", path);
	}

	return 0;
}