2 files changed, 9 insertions, 3 deletions
diff --git a/third_party/nix/src/libexpr/primops/fetchGit.cc b/third_party/nix/src/libexpr/primops/fetchGit.cc
index 67641258d518..c45090707749 100644
--- a/third_party/nix/src/libexpr/primops/fetchGit.cc
+++ b/third_party/nix/src/libexpr/primops/fetchGit.cc
@@ -1,6 +1,7 @@
 #include <nlohmann/json.hpp>
 #include <regex>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 #include <sys/time.h>
 
@@ -76,7 +77,8 @@ GitInfo exportGit(ref<Store> store, const std::string& uri,
     }
 
     // clean working tree, but no ref or rev specified.  Use 'HEAD'.
-    rev = chomp(runProgram("git", true, {"-C", uri, "rev-parse", "HEAD"}));
+    rev = absl::StripTrailingAsciiWhitespace(
+        runProgram("git", true, {"-C", uri, "rev-parse", "HEAD"}));
     ref = "HEAD"s;
   }
 
@@ -145,7 +147,9 @@ GitInfo exportGit(ref<Store> store, const std::string& uri,
 
   // FIXME: check whether rev is an ancestor of ref.
   GitInfo gitInfo;
-  gitInfo.rev = rev != "" ? rev : chomp(readFile(localRefFile));
+  gitInfo.rev =
+      rev != "" ? rev
+                : absl::StripTrailingAsciiWhitespace(readFile(localRefFile));
   gitInfo.shortRev = std::string(gitInfo.rev, 0, 7);
 
   DLOG(INFO) << "using revision " << gitInfo.rev << " of repo '" << uri << "'";
diff --git a/third_party/nix/src/libexpr/primops/fetchMercurial.cc b/third_party/nix/src/libexpr/primops/fetchMercurial.cc
index 9223f1c3ca99..69ece06eacb9 100644
--- a/third_party/nix/src/libexpr/primops/fetchMercurial.cc
+++ b/third_party/nix/src/libexpr/primops/fetchMercurial.cc
@@ -1,6 +1,7 @@
 #include <nlohmann/json.hpp>
 #include <regex>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 #include <sys/time.h>
 
@@ -43,7 +44,8 @@ HgInfo exportMercurial(ref<Store> store, const std::string& uri,
 
       HgInfo hgInfo;
       hgInfo.rev = "0000000000000000000000000000000000000000";
-      hgInfo.branch = chomp(runProgram("hg", true, {"branch", "-R", uri}));
+      hgInfo.branch = absl::StripTrailingAsciiWhitespace(
+          runProgram("hg", true, {"branch", "-R", uri}));
 
       auto files = tokenizeString<std::set<std::string>>(
           runProgram("hg", true,