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-rw-r--r--corepkgs/Makefile.am2
-rw-r--r--corepkgs/config.nix.in1
-rw-r--r--corepkgs/fetchurl.nix36
3 files changed, 38 insertions, 1 deletions
diff --git a/corepkgs/Makefile.am b/corepkgs/Makefile.am
index a8de601657b1..729d15e7b191 100644
--- a/corepkgs/Makefile.am
+++ b/corepkgs/Makefile.am
@@ -1,6 +1,6 @@
 all-local: config.nix
 
-files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh derivation.nix
+files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh derivation.nix fetchurl.nix
 
 install-exec-local:
 	$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs
diff --git a/corepkgs/config.nix.in b/corepkgs/config.nix.in
index 1be4bd0904ba..26e821d0e2d7 100644
--- a/corepkgs/config.nix.in
+++ b/corepkgs/config.nix.in
@@ -10,5 +10,6 @@ in {
   xz = "@xz@";
   tar = "@tar@";
   tr = "@tr@";
+  curl = "@curl@";
   nixBinDir = fromEnv "NIX_BIN_DIR" "@bindir@";
 }
diff --git a/corepkgs/fetchurl.nix b/corepkgs/fetchurl.nix
new file mode 100644
index 000000000000..4a0ae827995d
--- /dev/null
+++ b/corepkgs/fetchurl.nix
@@ -0,0 +1,36 @@
+with import <nix/config.nix>;
+
+{system ? builtins.currentSystem, url, outputHash ? "", outputHashAlgo ? "", md5 ? "", sha1 ? "", sha256 ? ""}:
+
+assert (outputHash != "" && outputHashAlgo != "")
+    || md5 != "" || sha1 != "" || sha256 != "";
+
+let
+
+  builder = builtins.toFile "fetchurl.sh"
+    ''
+      echo "downloading $url into $out"
+      ${curl} --fail --location --max-redirs 20 --insecure "$url" > "$out"
+    '';
+
+in
+    
+derivation {
+  name = baseNameOf (toString url);
+  builder = shell;
+  args = [ "-e" builder ];
+
+  # New-style output content requirements.
+  outputHashAlgo = if outputHashAlgo != "" then outputHashAlgo else
+      if sha256 != "" then "sha256" else if sha1 != "" then "sha1" else "md5";
+  outputHash = if outputHash != "" then outputHash else
+      if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
+  
+  inherit system url;
+
+  # No need to double the amount of network traffic
+  preferLocalBuild = true;
+
+  # Don't build in a chroot because Nix's dependencies may not be there.
+  __noChroot = true;
+}