Remove some duplicate code

src/libexpr/primops.cc

@@ -815,23 +815,16 @@ static void prim_readDir(EvalState & state, const Pos & pos, Value * * args, Val
     DirEntries entries = readDirectory(path);
     state.mkAttrs(v, entries.size());
 
-    for (const auto & ent : entries) {
+    for (auto & ent : entries) {
         Value * ent_val = state.allocAttr(v, state.symbols.create(ent.name));
-        if (ent.type == DT_UNKNOWN) {
-            struct stat st = lstat(path + "/" + ent.name);
-            mkString(*ent_val,
-                S_ISREG(st.st_mode) ? "regular" :
-                S_ISDIR(st.st_mode) ? "directory" :
-                S_ISLNK(st.st_mode) ? "symlink" :
-                "unknown");
-        } else {
+        if (ent.type == DT_UNKNOWN)
+            ent.type = getFileType(path);
         mkString(*ent_val,
             ent.type == DT_REG ? "regular" :
             ent.type == DT_DIR ? "directory" :
             ent.type == DT_LNK ? "symlink" :
             "unknown");
     }
-    }
 
     v.attrs->sort();
 }

src/libstore/gc.cc

@@ -301,12 +301,8 @@ static void findRoots(StoreAPI & store, const Path & path, unsigned char type, R
 {
     try {
 
-        if (type == DT_UNKNOWN) {
-            struct stat st = lstat(path);
-            if (S_ISDIR(st.st_mode)) type = DT_DIR;
-            else if (S_ISLNK(st.st_mode)) type = DT_LNK;
-            else if (S_ISREG(st.st_mode)) type = DT_REG;
-        }
+        if (type == DT_UNKNOWN)
+            type = getFileType(path);
 
         if (type == DT_DIR) {
             for (auto & i : readDirectory(path))

src/libutil/util.cc

@@ -227,6 +227,16 @@ DirEntries readDirectory(const Path & path)
 }
 
 
+unsigned char getFileType(const Path & path)
+{
+    struct stat st = lstat(path);
+    if (S_ISDIR(st.st_mode)) return DT_DIR;
+    if (S_ISLNK(st.st_mode)) return DT_LNK;
+    if (S_ISREG(st.st_mode)) return DT_REG;
+    return DT_UNKNOWN;
+}
+
+
 string readFile(int fd)
 {
     struct stat st;

src/libutil/util.hh

@@ -77,6 +77,8 @@ typedef vector<DirEntry> DirEntries;
 
 DirEntries readDirectory(const Path & path);
 
+unsigned char getFileType(const Path & path);
+
 /* Read the contents of a file into a string. */
 string readFile(int fd);
 string readFile(const Path & path, bool drain = false);