busybox/coreutils/chown.c

/* vi: set sw=4 ts=4: */
/*
 * Mini chown implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* BB_AUDIT SUSv3 defects - unsupported options -H, -L, and -P. */
/* BB_AUDIT GNU defects - unsupported long options. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chown.html */

#include "busybox.h"

static uid_t uid = -1;
static gid_t gid = -1;

static int (*chown_func)(const char *, uid_t, gid_t) = chown;

#define OPT_RECURSE (option_mask32 & 1)
#define OPT_NODEREF (option_mask32 & 2)
#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
#define OPT_QUIET   (USE_DESKTOP(option_mask32 & 0x10) SKIP_DESKTOP(0))
#define OPT_STR     ("Rh" USE_DESKTOP("vcf"))

/* TODO:
 * -H if a command line argument is a symbolic link to a directory, traverse it
 * -L traverse every symbolic link to a directory encountered
 * -P do not traverse any symbolic links (default)
 */

static int fileAction(const char *fileName, struct stat *statbuf,
		void ATTRIBUTE_UNUSED *junk, int depth)
{
	// TODO: -H/-L/-P
	// if (depth ... && S_ISLNK(statbuf->st_mode)) ....

	if (!chown_func(fileName,
				(uid == (uid_t)-1) ? statbuf->st_uid : uid,
				(gid == (gid_t)-1) ? statbuf->st_gid : gid)) {
		if (OPT_VERBOSE
		 || (OPT_CHANGED && (statbuf->st_uid != uid || statbuf->st_gid != gid))
		) {
			printf("changed ownership of '%s' to %u:%u\n", fileName, uid, gid);
		}
		return TRUE;
	}
	if (!OPT_QUIET)
		bb_perror_msg("%s", fileName);	/* A filename can have % in it... */
	return FALSE;
}

int chown_main(int argc, char **argv)
{
	int retval = EXIT_SUCCESS;
	char *groupName;

	opt_complementary = "-2";
	getopt32(argc, argv, OPT_STR);

	if (OPT_NODEREF) chown_func = lchown;

	argv += optind;

	/* First, check if there is a group name here */
	groupName = strchr(*argv, '.');
	if (!groupName) {
		groupName = strchr(*argv, ':');
	}

	/* Check for the username and groupname */
	if (groupName) {
		*groupName++ = '\0';
		gid = get_ug_id(groupName, bb_xgetgrnam);
	}
	if (--groupName != *argv)
		uid = get_ug_id(*argv, bb_xgetpwnam);
	++argv;

	/* Ok, ready to do the deed now */
	do {
		if (!recursive_action(*argv,
				OPT_RECURSE,	// recurse
				FALSE,          // follow links: TODO: -H/-L/-P
				FALSE,          // depth first
				fileAction,     // file action
				fileAction,     // dir action
				NULL,           // user data
				0)              // depth 
		) {
			retval = EXIT_FAILURE;
		}
	} while (*++argv);

	return retval;
}