Merge pull request #3 from oxalica/fast-install

Speed up installPhase for nightly rust-docs

rust-installer.py

@@ -0,0 +1,27 @@
+# The install script for rust components.
+# Some toolchains have tons of install directives which makes bash script too slow.
+import os
+from pathlib import Path
+from shutil import copy, copytree
+
+out = Path(os.environ['out'])
+verbose = os.environ.get('VERBOSE_INSTALL') == '1'
+
+installer_version = int(Path('./rust-installer-version').read_text().strip())
+if installer_version == 3:
+    for component in Path('./components').read_text().splitlines():
+        print(f'Installing component {component}')
+        for directive in (Path(component) / 'manifest.in').read_text().splitlines():
+            cmd, file = directive.split(':')
+            in_file, out_file = Path(component) / file, out / file
+            out_file.parent.mkdir(parents=True, exist_ok=True)
+            if verbose:
+                print(f'Installing {cmd}: {file}')
+            if cmd == 'file':
+                copy(in_file, out_file)
+            elif cmd == 'dir':
+                copytree(in_file, out_file)
+            else:
+                assert False, f'Unknown command: {cmd}'
+else:
+    assert False, f'Unknown installer version: {installer_version}'

rust-overlay.nix

@@ -149,11 +149,19 @@ let
           # entire unpacked contents after just a little twiddling.
           preferLocalBuild = true;
 
+          nativeBuildInputs = [ self.python3 ];
+
+          # VERBOSE_INSTALL = 1; # No spam by default.
+
+          installPhase = ''
+            runHook preInstall
+            python3 ${./rust-installer.py}
+            runHook postInstall
+          '';
+
           # (@nbp) TODO: Check on Windows and Mac.
           # This code is inspired by patchelf/setup-hook.sh to iterate over all binaries.
-          installPhase = ''
-            patchShebangs install.sh
-            CFG_DISABLE_LDCONFIG=1 ./install.sh --prefix=$out --verbose
+          preFixup = ''
             setInterpreter() {
               local dir="$1"
               [ -e "$dir" ] || return 0