sortix--sortix/sysinstall/fileops.c

/*
 * Copyright (c) 2015, 2016 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.
 *
 * fileops.c
 * File operation utility functions.
 */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "fileops.h"

int mkdir_p(const char* path, mode_t mode)
{
	int saved_errno = errno;
	if ( !mkdir(path, mode) )
		return 0;
	if ( errno == ENOENT )
	{
		char* prev = strdup(path);
		if ( !prev )
			return -1;
		int status =  mkdir_p(dirname(prev), mode | 0500);
		free(prev);
		if ( status < 0 )
			return -1;
		errno = saved_errno;
		if ( !mkdir(path, mode) )
			return 0;
	}
	if ( errno == EEXIST )
		return errno = saved_errno, 0;
	return -1;
}

int access_or_die(const char* path, int mode)
{
	if ( access(path, mode) < 0 )
	{
		if ( errno == EACCES ||
		     errno == ENOENT ||
             errno == ELOOP ||
             errno == ENAMETOOLONG ||
             errno == ENOTDIR )
			return -1;
		warn("%s", path);
		_exit(2);
	}
	return 0;
}

void mkdir_or_chmod_or_die(const char* path, mode_t mode)
{
	if ( mkdir(path, mode) == 0 )
		return;
	if ( errno == EEXIST )
	{
		if ( chmod(path, mode) == 0 )
			return;
		err(2, "chmod: %s", path);
	}
	err(2, "mkdir: %s", path);
}