passAsFile: leave out the hash prefix

Having a colon in the path may cause issues, and having the hash
function indicated isn't actually necessary. We now verify the path 
format in the tests to prevent regressions.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 9ee3b04e3..78f39fed1 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2460,7 +2460,7 @@ void DerivationGoal::initTmpDir() {
                 env[i.first] = i.second;
             } else {
                 auto hash = hashString(htSHA256, i.first);
-                string fn = ".attr-" + hash.to_string();
+                string fn = ".attr-" + hash.to_string(Base32, false);
                 Path p = tmpDir + "/" + fn;
                 writeFile(p, i.second);
                 chownToBuilder(p);