Teach build system to install relative symlinks if requested

Add a configure option, --enable-relative-symlinks, which will use
relative symlinks for the ELF shared library files.

Addresses-Sourceforge-Bug: #3520767

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

7 files changed, 551 insertions, 17 deletions

diff --git a/MCONFIG.in b/MCONFIG.in
index bdb3580b..0c745220 100644
--- a/MCONFIG.in
+++ b/MCONFIG.in
@@ -136,6 +136,23 @@ $(top_builddir)/util/subst:
 	cd $(top_builddir)/util ; $(MAKE) subst
 
 #
+# Script for installing symlinks (for shared libraries)
+#
+$(top_builddir)/util/install-symlink: $(top_srcdir)/util/install-symlink.in \
+			      $(top_builddir)/config.status
+	cd $(top_builddir); CONFIG_FILES=util/install-symlink ./config.status
+	chmod +x $(top_builddir)/util/install-symlink
+
+$(top_builddir)/util/symlinks:
+	cd $(top_builddir)/util ; $(MAKE) symlinks
+
+INSTALL_SYMLINK = /bin/sh $(top_builddir)/util/install-symlink \
+			@SYMLINK_RELATIVE@ \
+			--symlinks=$(top_builddir)/util/symlinks
+DEP_INSTALL_SYMLINK = $(top_builddir)/util/install-symlink \
+			$(top_builddir)/util/symlinks
+
+#
 # Warning flags
 #
 # Run make gcc-wall to do a build with warning messages.
diff --git a/configure b/configure
index ac0426e8..ae599cd6 100755
--- a/configure
+++ b/configure
@@ -715,6 +715,7 @@ HTREE_CMT
 Q
 E
 LINK_BUILD_FLAGS
+SYMLINK_RELATIVE
 LINK_INSTALL_FLAGS
 MAINTAINER_CMT
 CPP
@@ -795,6 +796,7 @@ with_ldopts
 with_root_prefix
 enable_maintainer_mode
 enable_symlink_install
+enable_symlink_relative_symlinks
 enable_symlink_build
 enable_verbose_makecmds
 enable_compression
@@ -1449,6 +1451,7 @@ Optional Features:
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --enable-maintainer-mode enable makefile rules useful for maintainers
   --enable-symlink-install use symlinks when installing instead of hard links
+  --enable-relative-symlinks use relative symlinks when installing
   --enable-symlink-build  use symlinks while building instead of hard links
   --enable-verbose-makecmds enable verbose make command output
   --enable-compression	  enable EXPERIMENTAL compression support
@@ -4376,8 +4379,29 @@ fi
 
 else
   LINK_INSTALL_FLAGS=-f
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling symlinks for install" >&5
-$as_echo "Disabling symlinks for install" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling symlinks for install by default" >&5
+$as_echo "Disabling symlinks for install by default" >&6; }
+
+fi
+
+
+# Check whether --enable-symlink-relative-symlinks was given.
+if test "${enable_symlink_relative_symlinks+set}" = set; then :
+  enableval=$enable_symlink_relative_symlinks; if test "$enableval" = "no"
+then
+	SYMLINK_RELATIVE=
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling relative symlinks for install" >&5
+$as_echo "Disabling relative symlinks for install" >&6; }
+else
+	SYMLINK_RELATIVE=--relative
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Enabling symlinks for install" >&5
+$as_echo "Enabling symlinks for install" >&6; }
+fi
+
+else
+  SYMLINK_RELATIVE=
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling relative symlinks for install by default" >&5
+$as_echo "Disabling relative symlinks for install by default" >&6; }
 
 fi
 
@@ -4397,8 +4421,8 @@ fi
 
 else
   LINK_BUILD_FLAGS=
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling symlinks for build" >&5
-$as_echo "Disabling symlinks for build" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling symlinks for build by default" >&5
+$as_echo "Disabling symlinks for build by default" >&6; }
 
 fi
 
@@ -11293,7 +11317,7 @@ test -d include || mkdir include
 test -d include/linux || mkdir include/linux
 test -d include/asm || mkdir include/asm
 for i in MCONFIG Makefile e2fsprogs.spec \
-	util/Makefile util/subst.conf util/gen-tarball \
+	util/Makefile util/subst.conf util/gen-tarball util/install-symlink \
 	lib/et/Makefile lib/ss/Makefile lib/e2p/Makefile \
 	lib/ext2fs/Makefile lib/ext2fs/ext2_types.h \
 	lib/uuid/Makefile lib/uuid/uuid_types.h \
diff --git a/configure.in b/configure.in
index e15a77a6..83a6a1d0 100644
--- a/configure.in
+++ b/configure.in
@@ -164,10 +164,28 @@ else
 fi
 ,
 LINK_INSTALL_FLAGS=-f
-AC_MSG_RESULT([Disabling symlinks for install])
+AC_MSG_RESULT([Disabling symlinks for install by default])
 )
 AC_SUBST(LINK_INSTALL_FLAGS)
 dnl
+dnl handle --enable-relative-symlinks
+dnl
+AC_ARG_ENABLE([symlink-relative-symlinks],
+[  --enable-relative-symlinks use relative symlinks when installing],
+if test "$enableval" = "no"
+then
+	SYMLINK_RELATIVE=
+	AC_MSG_RESULT([Disabling relative symlinks for install])
+else
+	SYMLINK_RELATIVE=--relative
+	AC_MSG_RESULT([Enabling symlinks for install])
+fi
+,
+	SYMLINK_RELATIVE=
+AC_MSG_RESULT([Disabling relative symlinks for install by default])
+)
+AC_SUBST(SYMLINK_RELATIVE)
+dnl
 dnl handle --enable-symlink-build
 dnl
 AC_ARG_ENABLE([symlink-build],
@@ -182,7 +200,7 @@ else
 fi
 ,
 LINK_BUILD_FLAGS=
-AC_MSG_RESULT([Disabling symlinks for build])
+AC_MSG_RESULT([Disabling symlinks for build by default])
 )
 AC_SUBST(LINK_BUILD_FLAGS)
 dnl
@@ -1230,7 +1248,7 @@ test -d include || mkdir include
 test -d include/linux || mkdir include/linux
 test -d include/asm || mkdir include/asm
 for i in MCONFIG Makefile e2fsprogs.spec \
-	util/Makefile util/subst.conf util/gen-tarball \
+	util/Makefile util/subst.conf util/gen-tarball util/install-symlink \
 	lib/et/Makefile lib/ss/Makefile lib/e2p/Makefile \
 	lib/ext2fs/Makefile lib/ext2fs/ext2_types.h \
 	lib/uuid/Makefile lib/uuid/uuid_types.h \
diff --git a/lib/Makefile.elf-lib b/lib/Makefile.elf-lib
index ea600c7a..c24636cc 100644
--- a/lib/Makefile.elf-lib
+++ b/lib/Makefile.elf-lib
@@ -40,18 +40,15 @@ installdirs-elf-lib::
 
 installdirs:: installdirs-elf-lib
 
-install-shlibs install:: $(ELF_LIB) installdirs-elf-lib
+install-shlibs install:: $(ELF_LIB) installdirs-elf-lib $(DEP_INSTALL_SYMLINK)
 	$(E) "	INSTALL-ELF-LIB $(ELF_INSTALL_DIR)/$(ELF_LIB)"
 	$(Q) $(INSTALL_PROGRAM) $(ELF_LIB) $(DESTDIR)$(ELF_INSTALL_DIR)/$(ELF_LIB)
 	$(E) "	SYMLINK $(ELF_INSTALL_DIR)/$(ELF_SONAME)"
-	$(Q) $(LN_S) -f $(ELF_LIB) $(DESTDIR)$(ELF_INSTALL_DIR)/$(ELF_SONAME)
+	$(Q) $(INSTALL_SYMLINK) $(ELF_INSTALL_DIR)/$(ELF_LIB) \
+		$(ELF_INSTALL_DIR)/$(ELF_SONAME) $(DESTDIR)
 	$(E) "	SYMLINK $(libdir)/$(ELF_IMAGE).so"
-	$(Q) if test "$(ELF_INSTALL_DIR)" = "$(libdir)"; then \
-		$(LN_S) -f $(ELF_SONAME) $(DESTDIR)$(libdir)/$(ELF_IMAGE).so ; \
-	else \
-		$(LN_S) -f $(ELF_INSTALL_DIR)/$(ELF_SONAME) \
-			$(DESTDIR)$(libdir)/$(ELF_IMAGE).so; \
-	fi			
+	$(Q) $(INSTALL_SYMLINK) $(ELF_INSTALL_DIR)/$(ELF_SONAME) \
+		$(libdir)/$(ELF_IMAGE).so $(DESTDIR)
 	$(E) "	LDCONFIG"
 	$(Q) -$(LDCONFIG)
 
diff --git a/util/Makefile.in b/util/Makefile.in
index 4ad769f6..adf0b461 100644
--- a/util/Makefile.in
+++ b/util/Makefile.in
@@ -17,7 +17,7 @@ SRCS = $(srcdir)/subst.c
 	$(E) "	CC $<"
 	$(Q) $(BUILD_CC) -c $(BUILD_CFLAGS) $< -o $@
 
-PROGS=		subst
+PROGS=		subst symlinks
 
 all:: $(PROGS) gen-tarball
 
@@ -29,6 +29,10 @@ copy_sparse: copy_sparse.o
 	$(E) "	LD $@"
 	$(Q) $(BUILD_CC) $(BUILD_LDFLAGS) -o copy_sparse copy_sparse.o
 
+symlinks: symlinks.o
+	$(E) "	LD $@"
+	$(Q) $(BUILD_CC) $(BUILD_LDFLAGS) -o symlinks symlinks.o
+
 gen-tarball: $(srcdir)/gen-tarball.in $(top_builddir)/config.status
 	$(E) "	CONFIG.STATUS $@"
 	$(Q) cd $(top_builddir); CONFIG_FILES=util/gen-tarball ./config.status
diff --git a/util/install-symlink.in b/util/install-symlink.in
new file mode 100644
index 00000000..24341b8b
--- /dev/null
+++ b/util/install-symlink.in
@@ -0,0 +1,89 @@
+#!/bin/sh
+#
+# install-symlink source destination destdir
+#
+
+SYMLINKS=symlinks
+LN_S="@LN_S@"
+RM="@RM@"
+FORCE_RELATIVE=NO
+FORCE_ABSOLUTE=NO
+
+while echo $1 | grep -q -- ^- ;
+do
+	case $1 in
+		--relative)
+			FORCE_RELATIVE=YES
+			;;
+		--absolute)
+			FORCE_ABSOLUTE=YES
+			;;
+		--debian)
+			FORCE_ABSOLUTE=NO
+			FORCE_RELATIVE=NO
+			;;
+		--symlinks=*)
+			SYMLINKS=$(echo $1 | sed -e 's/--symlinks=//')
+			;;
+		*)
+			echo "Unknown option $1"
+			exit 1
+			;;
+	esac					     
+	shift;
+done
+
+
+FIX_SYMLINK="$SYMLINKS -c"
+
+SRC="$1"
+DEST="$2"
+DESTDIR="$3"
+
+if ! echo $SRC | grep -q ^/ ; then
+	echo $SRC: Source pathname must be absolute
+	exit 1
+fi
+
+if ! echo $DEST | grep -q ^/ ; then
+	echo $DEST: Destination pathname must be absolute
+	exit 1
+fi
+
+if ! test -e "$DESTDIR$SRC" ; then
+	echo $DESTDIR$SRC: file or directory does not exist
+	exit 1
+fi
+
+$RM -f "$DESTDIR$DEST"
+
+if test "$LN_S" != "ln -s" ; then
+	$LN_S "$DESTDIR$SRC" "$DESTDIR$DEST"
+	exit 0
+fi
+
+if test $(dirname "$SRC") = $(dirname "$DEST") ; then
+	$LN_S "$(basename "$SRC")" "$DESTDIR$DEST"
+	exit 0
+fi
+
+TOP_SRC=$(echo $SRC | awk -F/ '{print $2}')
+TOP_DEST=$(echo $DEST | awk -F/ '{print $2}')
+
+if test $FORCE_RELATIVE = YES ; then
+	TOP_SRC=FORCE
+	TOP_DEST=FORCE
+fi
+
+if test $FORCE_ABSOLUTE = YES ; then
+	TOP_SRC=FORCE
+	TOP_DEST=FORCE_ABSOLUTE
+fi
+
+if test $TOP_SRC != $TOP_DEST ; then
+	$LN_S "$SRC" "$DESTDIR$DEST"
+else
+	$LN_S "$DESTDIR$SRC" "$DESTDIR$DEST"
+	$FIX_SYMLINK "$DESTDIR$DEST"
+fi
+
diff --git a/util/symlinks.c b/util/symlinks.c
new file mode 100644
index 00000000..f3a632af
--- /dev/null
+++ b/util/symlinks.c
@@ -0,0 +1,385 @@
+#define _FILE_OFFSET_BITS 64
+#define _LARGEFILE_SOURCE
+#define _LARGEFILE64_SOURCE
+
+#include <unistd.h>
+#ifndef _POSIX_SOURCE
+#define _POSIX_SOURCE
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <time.h>
+#include <stddef.h>
+#include <errno.h>
+
+#ifndef S_ISLNK
+#define S_ISLNK(mode) (((mode) & (_S_IFMT)) == (_S_IFLNK))
+#endif
+
+#ifndef PATH_MAX
+#define PATH_MAX 1024
+#endif
+
+#define progver "%s: scan/change symbolic links - v1.3 - by Mark Lord\n\n"
+static char *progname;
+static int verbose = 0, fix_links = 0, recurse = 0, delete = 0, shorten = 0,
+		testing = 0, single_fs = 1;
+
+/*
+ * tidypath removes excess slashes and "." references from a path string
+ */
+
+static int substr (char *s, char *old, char *new)
+{
+	char *tmp = NULL;
+	int oldlen = strlen(old), newlen = 0;
+
+	if (NULL == strstr(s, old))
+		return 0;
+
+	if (new)
+		newlen = strlen(new);
+
+	if (newlen > oldlen) {
+		if ((tmp = malloc(strlen(s))) == NULL) {
+			fprintf(stderr, "no memory\n");
+			exit (1);
+		}
+	}
+
+	while (NULL != (s = strstr(s, old))) {
+		char *p, *old_s = s;
+
+		if (new) {
+			if (newlen > oldlen)
+				old_s = strcpy(tmp, s);
+			p = new;
+			while (*p)
+				*s++ = *p++;
+		}
+		p = old_s + oldlen;
+		while ((*s++ = *p++));
+	}
+	if (tmp)
+		free(tmp);
+	return 1;
+}
+
+
+static int tidy_path (char *path)
+{
+	int tidied = 0;
+	char *s, *p;
+
+	s = path + strlen(path) - 1;
+	if (s[0] != '/') {	/* tmp trailing slash simplifies things */
+		s[1] = '/';
+		s[2] = '\0';
+	}
+	while (substr(path, "/./", "/"))
+		tidied = 1;
+	while (substr(path, "//", "/"))
+		tidied = 1;
+
+	while ((p = strstr(path,"/../")) != NULL) {
+		s = p+3;
+		for (p--; p != path; p--) if (*p == '/') break;
+		if (*p != '/')
+			break;
+		while ((*p++ = *s++));
+		tidied = 1;
+	}
+	if (*path == '\0')
+		strcpy(path,"/");
+	p = path + strlen(path) - 1;
+	if (p != path && *p == '/')
+		*p-- = '\0';	/* remove tmp trailing slash */
+	while (p != path && *p == '/') {	/* remove any others */
+		*p-- = '\0';
+		tidied = 1;
+	}
+	while (!strncmp(path,"./",2)) {
+		for (p = path, s = path+2; (*p++ = *s++););
+		tidied = 1;
+	}
+	return tidied;
+}
+
+static int shorten_path (char *path, char *abspath)
+{
+	static char dir[PATH_MAX];
+	int shortened = 0;
+	char *p;
+
+	/* get rid of unnecessary "../dir" sequences */
+	while (abspath && strlen(abspath) > 1 && (p = strstr(path,"../"))) {
+		/* find innermost occurance of "../dir", and save "dir" */
+		int slashes = 2;
+		char *a, *s, *d = dir;
+		while ((s = strstr(p+3, "../"))) {
+			++slashes;
+			p = s;
+		}
+		s = p+3;
+		*d++ = '/';
+		while (*s && *s != '/')
+			*d++ = *s++;
+		*d++ = '/';
+		*d = '\0';
+		if (!strcmp(dir,"//"))
+			break;
+		/* note: p still points at ../dir */
+		if (*s != '/' || !*++s)
+			break;
+		a = abspath + strlen(abspath) - 1;
+		while (slashes-- > 0) {
+			if (a <= abspath)
+				goto ughh;
+			while (*--a != '/') {
+				if (a <= abspath)
+					goto ughh;
+			}
+		}
+		if (strncmp(dir, a, strlen(dir)))
+			break;
+		while ((*p++ = *s++)); /* delete the ../dir */
+		shortened = 1;
+	}
+ughh:
+	return shortened;
+}
+
+
+static void fix_symlink (char *path, dev_t my_dev)
+{
+	static char lpath[PATH_MAX], new[PATH_MAX], abspath[PATH_MAX];
+	char *p, *np, *lp, *tail, *msg;
+	struct stat stbuf, lstbuf;
+	int c, fix_abs = 0, fix_messy = 0, fix_long = 0;
+
+	if ((c = readlink(path, lpath, sizeof(lpath))) == -1) {
+		perror(path);
+		return;
+	}
+	lpath[c] = '\0';	/* readlink does not null terminate it */
+
+	/* construct the absolute address of the link */
+	abspath[0] = '\0';
+	if (lpath[0] != '/') {
+		strcat(abspath,path);
+		c = strlen(abspath);
+		if ((c > 0) && (abspath[c-1] == '/'))
+			abspath[c-1] = '\0'; /* cut trailing / */
+		if ((p = strrchr(abspath,'/')) != NULL)
+			*p = '\0'; /* cut last component */
+		strcat(abspath,"/");
+	}
+	strcat(abspath,lpath);
+	(void) tidy_path(abspath);
+
+	/* check for various things */
+	if (stat(abspath, &stbuf) == -1) {
+		printf("dangling: %s -> %s\n", path, lpath);
+		if (delete) {
+			if (unlink (path)) {
+				perror(path); 
+			} else
+				printf("deleted:  %s -> %s\n", path, lpath);
+		}
+		return;
+	}
+
+	if (single_fs)
+		lstat(abspath, &lstbuf); /* if the above didn't fail, then this shouldn't */
+	
+	if (single_fs && lstbuf.st_dev != my_dev) {
+		msg = "other_fs:";
+	} else if (lpath[0] == '/') {
+		msg = "absolute:";
+		fix_abs = 1;
+	} else if (verbose) {
+		msg = "relative:";
+	} else
+		msg = NULL;
+	fix_messy = tidy_path(strcpy(new,lpath));
+	if (shorten)
+		fix_long = shorten_path(new, path);
+	if (!fix_abs) {
+		if (fix_messy)
+			msg = "messy:   ";
+		else if (fix_long)
+			msg = "lengthy: ";
+	}
+	if (msg != NULL)
+		printf("%s %s -> %s\n", msg, path, lpath);
+	if (!(fix_links || testing) || !(fix_messy || fix_abs || fix_long))
+		return;
+
+	if (fix_abs) {
+		/* convert an absolute link to relative: */
+		/* point tail at first part of lpath that differs from path */
+		/* point p    at first part of path  that differs from lpath */
+		(void) tidy_path(lpath);
+		tail = lp = lpath;
+		p = path;
+		while (*p && (*p == *lp)) {
+			if (*lp++ == '/') {
+				tail = lp;
+				while (*++p == '/');
+			}
+		}
+
+		/* now create new, with "../"s followed by tail */
+		np = new;
+		while (*p) {
+			if (*p++ == '/') {
+				*np++ = '.';
+				*np++ = '.';
+				*np++ = '/';
+				while (*p == '/') ++p;
+			}
+		}
+		strcpy (np, tail);
+		(void) tidy_path(new);
+		if (shorten) (void) shorten_path(new, path);
+	}
+	shorten_path(new,path);
+	if (!testing) {
+		if (unlink (path)) {
+			perror(path);
+			return;
+		}
+		if (symlink(new, path)) {
+			perror(path);
+			return;
+		}
+	}
+	printf("changed:  %s -> %s\n", path, new);
+}
+
+static void dirwalk (char *path, int pathlen, dev_t dev)
+{
+ 	char *name;
+	DIR *dfd;
+	static struct stat st;
+	static struct dirent *dp;
+
+	if ((dfd = opendir(path)) == NULL) {
+		perror(path);
+		return;
+	}
+
+	name = path + pathlen;
+	if (*(name-1) != '/')
+		*name++ = '/'; 
+
+	while ((dp = readdir(dfd)) != NULL ) {
+		strcpy(name, dp->d_name);
+                if (strcmp(name, ".") && strcmp(name,"..")) {
+			if (lstat(path, &st) == -1) {
+				perror(path);
+			} else if (st.st_dev == dev) {
+				if (S_ISLNK(st.st_mode)) {
+					fix_symlink (path, dev);
+				} else if (recurse && S_ISDIR(st.st_mode)) {
+					dirwalk(path, strlen(path), dev);
+				}
+			}
+		}
+	} 
+	closedir(dfd);
+	path[pathlen] = '\0';
+}
+
+static void usage_error (void)
+{
+	fprintf(stderr, progver, progname);
+	fprintf(stderr, "Usage:\t%s [-cdorstv] LINK|DIR ...\n\n", progname);
+	fprintf(stderr, "Flags:"
+		"\t-c == change absolute/messy links to relative\n"
+		"\t-d == delete dangling links\n"
+		"\t-o == warn about links across file systems\n"
+		"\t-r == recurse into subdirs\n"
+		"\t-s == shorten lengthy links (displayed in output only when -c not specified)\n"
+		"\t-t == show what would be done by -c\n"
+		"\t-v == verbose (show all symlinks)\n\n");
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+#if defined (_GNU_SOURCE) && defined (__GLIBC__)
+	static char path[PATH_MAX+2];
+	char* cwd = get_current_dir_name();
+#else
+	static char path[PATH_MAX+2], cwd[PATH_MAX+2];
+#endif
+	int dircount = 0;
+	char c, *p;
+
+	if  ((progname = (char *) strrchr(*argv, '/')) == NULL)
+                progname = *argv;
+        else
+                progname++;
+
+#if defined (_GNU_SOURCE) && defined (__GLIBC__)
+	if (NULL == cwd) {
+		fprintf(stderr,"get_current_dir_name() failed\n");
+#else
+	if (NULL == getcwd(cwd,PATH_MAX)) {
+		fprintf(stderr,"getcwd() failed\n");
+#endif
+		exit (1);
+	}
+#if defined (_GNU_SOURCE) && defined (__GLIBC__)
+	cwd = realloc(cwd, strlen(cwd)+2);
+	if (cwd == NULL) {
+		fprintf(stderr, "realloc() failed\n");
+		exit (1);
+	}
+#endif
+	if (!*cwd || cwd[strlen(cwd)-1] != '/')
+		strcat(cwd,"/");
+
+	while (--argc) {
+		p = *++argv;
+		if (*p == '-') {
+			if (*++p == '\0')
+				usage_error();
+			while ((c = *p++)) {
+				     if (c == 'c')	fix_links = 1;
+				else if (c == 'd')	delete    = 1;
+				else if (c == 'o')	single_fs = 0;
+				else if (c == 'r')	recurse   = 1;
+				else if (c == 's')	shorten   = 1;
+				else if (c == 't')	testing   = 1;
+				else if (c == 'v')	verbose   = 1;
+				else			usage_error();
+			}
+		} else {
+			struct stat st;
+			if (*p == '/')
+				*path = '\0';
+			else
+				strcpy(path,cwd);
+			tidy_path(strcat(path, p));
+			if (lstat(path, &st) == -1)
+				perror(path);
+			else if (S_ISLNK(st.st_mode))
+				fix_symlink(path, st.st_dev);
+			else
+				dirwalk(path, strlen(path), st.st_dev);
+			++dircount;
+		}
+	}
+	if (dircount == 0)
+		usage_error();
+	exit (0);
+}