Fix compatibility with OTP 18 and 17 (#84)

Author: ericmj

.github/workflows/main.yml

@@ -22,16 +22,24 @@ jobs:
             elixir: 1.5.3
           - erlang: 17.5
             elixir: 1.1.1
+    env:
+      REBAR3_VERSION: 3.6.1
     steps:
       - uses: actions/checkout@v1
 
       - name: Install OTP
-        uses: actions/setup-elixir@v1
+        uses: ericmj/setup-elixir@3f15364
         with:
           otp-version: ${{matrix.pair.erlang}}
           elixir-version: ${{matrix.pair.elixir}}
 
+      - name: Install rebar3
+        run: |
+          wget https://github.com/erlang/rebar3/releases/download/${REBAR3_VERSION}/rebar3 -O rebar3
+          chmod +x rebar3
+          ./rebar3 -v
+
       - name: Run tests
         run: |
-          rebar3 ct
-          rebar3 as test proper
+          ./rebar3 ct
+          ./rebar3 as test proper

src/hex_erl_tar.erl

@@ -1649,7 +1649,7 @@ write_extracted_element(#tar_header{name=Name0}=Header, Bin, Opts) ->
 make_safe_path([$/|Path], Opts) ->
     make_safe_path(Path, Opts);
 make_safe_path(Path, #read_opts{cwd=Cwd}) ->
-    case filename:safe_relative_path(Path) of
+    case hex_filename:safe_relative_path(Path) of
         unsafe ->
             throw({error,{Path,unsafe_path}});
         SafePath ->
@@ -1687,7 +1687,7 @@ safe_relative_path_links([Segment|Segments], Cwd, PrevSegments, Acc) ->
                     end;
 
                 {error, _} ->
-                    case filename:safe_relative_path(join(Acc, Segment)) of
+                    case hex_filename:safe_relative_path(join(Acc, Segment)) of
                         unsafe ->
                             unsafe;
                         NewAcc ->