1 files changed, 24 insertions, 0 deletions
diff --git a/pkgs/build-support/cc-wrapper/utils.sh b/pkgs/build-support/cc-wrapper/utils.sh
new file mode 100644
index 00000000000..3ab512d85c4
--- /dev/null
+++ b/pkgs/build-support/cc-wrapper/utils.sh
@@ -0,0 +1,24 @@
+skip () {
+    if [ -n "$NIX_DEBUG" ]; then
+        echo "skipping impure path $1" >&2
+    fi
+}
+
+
+# Checks whether a path is impure.  E.g., `/lib/foo.so' is impure, but
+# `/nix/store/.../lib/foo.so' isn't.
+badPath() {
+    local p=$1
+
+    # Relative paths are okay (since they're presumably relative to
+    # the temporary build directory).
+    if [ "${p:0:1}" != / ]; then return 1; fi
+
+    # Otherwise, the path should refer to the store or some temporary
+    # directory (including the build directory).
+    test \
+        "$p" != "/dev/null" -a \
+        "${p:0:${#NIX_STORE}}" != "$NIX_STORE" -a \
+        "${p:0:4}" != "/tmp" -a \
+        "${p:0:${#NIX_BUILD_TOP}}" != "$NIX_BUILD_TOP"
+}