resolve absolute file paths on startup

Makefile

@@ -92,9 +92,9 @@ $(testdir)/basic-listing/run:
 	test "$$(/bin/echo -e 'dir1\ndir2\nfile2\nfile3\nfile4'; \
 	    /bin/echo -e 'multi w\\rd\nsubdir1\ntag2\ntag3')" = \
 	    "$$(ls $(dir $@)mount/tag1)"
-	# repeat same tests with default min-files and single thread
+	# run same tests with default min-files, single thread and relative dir
 	fusermount -z -u $(dir $@)mount
-	$(target) -d $(abspath $(dir $@)data) -- -s $(dir $@)mount
+	$(target) -d $(dir $@)data -- -s $(dir $@)mount
 	test "$$(/bin/echo -e 'file1.xml\nfile2\nfile3\nfile4')" = \
 	    "$$(ls $(dir $@)mount)"
 	test "$$(/bin/echo -e 'file1.xml\nfile2\nfile4')" = \
@@ -118,33 +118,32 @@ $(testdir)/errors/run:
 	setfattr -n user.xynta.tags -v tag2 $(dir $@)data/file2
 	# create file/tag name collision
 	/bin/echo "file3 content" > $(dir $@)data/tag1
-	echo '! $(target) -d $(abspath $(dir $@)data) -m0 -- $(dir $@)mount' \
-	    | sh
+	echo '! $(target) -d $(dir $@)data -m0 -- $(dir $@)mount' | sh
 	rm $(dir $@)data/tag1
 	# create file/tag self collision
 	/bin/echo "file4 content" > $(dir $@)data/file4
 	setfattr -n user.xynta.tags -v file4 $(dir $@)data/file4
-	echo '! $(target) -d $(abspath $(dir $@)data) -m0 -- $(dir $@)mount' \
-	    | sh
+	echo '! $(target) -d $(dir $@)data -m0 -- $(dir $@)mount' | sh
 	rm $(dir $@)data/file4
 	# create file names collision
 	mkdir $(dir $@)data/dir
 	/bin/echo "file5 content" > $(dir $@)data/dir/file1
-	echo '! $(target) -d $(abspath $(dir $@)data) -m0 -- $(dir $@)mount' \
-	    | sh
+	echo '! $(target) -d $(dir $@)data -m0 -- $(dir $@)mount' | sh
 	rm -r $(dir $@)data/dir
+	# create broken symlink
+	ln -s nowhere-is-here $(dir $@)data/file6
+	echo '! $(target) -d $(dir $@)data -m0 -- $(dir $@)mount' | sh
+	rm $(dir $@)data/file6
 	# try load data from non-existing dir
-	echo '! $(target) -d $(abspath $(dir $@)ndata) -m0 -- $(dir $@)mount' \
-	    | sh
+	echo '! $(target) -d $(dir $@)ndata -m0 -- $(dir $@)mount' | sh
 	# pass invalid option
-	echo '! $(target) -d $(abspath $(dir $@)ndata) -X -- $(dir $@)mount' \
-	    | sh
+	echo '! $(target) -d $(dir $@)data -X -- $(dir $@)mount' | sh
 	# request help
 	$(target) -h
 	# `forget' to pass data dir
 	echo '! $(target) -- $(dir $@)mount' | sh
 	# ok, test runtime errors on invalid paths
-	$(target) -d $(abspath $(dir $@)data) -m0 -- $(dir $@)mount
+	$(target) -d $(dir $@)data -m0 -- $(dir $@)mount
 	test ! -d $(dir $@)mount/tag1/tag2
 	test ! -f $(dir $@)mount/tag1/file2
 	test ! -e $(dir $@)mount/something

src/fs.cpp

@@ -1,5 +1,6 @@
 #include <dirent.h>
 #include <fuse_lowlevel.h>
+#include <stdlib.h>         // realpath, free
 #include <sys/stat.h>
 #include <sys/types.h>      // DIR
 #include <sys/xattr.h>      // getxattr
@@ -62,7 +63,12 @@ void xynta::fs::process_dir(
         if (*dirent->d_name != '.') {
             auto current_tags = tags;
             std::string name{dirent->d_name};
-            auto path = root + name;
+            char* fullpath = realpath((root + name).c_str(), nullptr);
+            if (!fullpath) {
+                throw std::system_error(errno, std::system_category());
+            }
+            std::string path{fullpath};
+            free(fullpath);
             struct stat stat;
             if (::stat(path.c_str(), &stat)) {
                 throw std::system_error(errno, std::system_category());