1 files changed, 47 insertions, 0 deletions
diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
new file mode 100644
index 000000000000..e1ce36e922e1
--- /dev/null
+++ b/src/libstore/builtins.cc
@@ -0,0 +1,47 @@
+#include "builtins.hh"
+#include "download.hh"
+#include "store-api.hh"
+#include "archive.hh"
+#include "compression.hh"
+
+namespace nix {
+
+void builtinFetchurl(const BasicDerivation & drv)
+{
+    auto url = drv.env.find("url");
+    if (url == drv.env.end()) throw Error("attribute ‘url’ missing");
+
+    /* No need to do TLS verification, because we check the hash of
+       the result anyway. */
+    DownloadOptions options;
+    options.verifyTLS = false;
+
+    /* Show a progress indicator, even though stderr is not a tty. */
+    options.showProgress = DownloadOptions::yes;
+
+    auto data = makeDownloader()->download(url->second, options);
+    assert(data.data);
+
+    auto out = drv.env.find("out");
+    if (out == drv.env.end()) throw Error("attribute ‘url’ missing");
+
+    Path storePath = out->second;
+    assertStorePath(storePath);
+
+    auto unpack = drv.env.find("unpack");
+    if (unpack != drv.env.end() && unpack->second == "1") {
+        if (string(*data.data, 0, 6) == string("\xfd" "7zXZ\0", 6))
+            data.data = decompress("xz", *data.data);
+        StringSource source(*data.data);
+        restorePath(storePath, source);
+    } else
+        writeFile(storePath, *data.data);
+
+    auto executable = drv.env.find("executable");
+    if (executable != drv.env.end() && executable->second == "1") {
+        if (chmod(storePath.c_str(), 0755) == -1)
+            throw SysError(format("making ‘%1%’ executable") % storePath);
+    }
+}
+
+}