From 5990b86391a7b51879c865eed39ee46f39cbdd11 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 21 May 2019 15:03:54 +0200
Subject: [PATCH] Use warn(), tweak messages

---
 src/libexpr/primops/flake.cc | 35 ++++++++++++-----------------------
 1 file changed, 12 insertions(+), 23 deletions(-)

diff --git a/src/libexpr/primops/flake.cc b/src/libexpr/primops/flake.cc
index 788977c72..6998536ec 100644
--- a/src/libexpr/primops/flake.cc
+++ b/src/libexpr/primops/flake.cc
@@ -387,29 +387,17 @@ LockFile::FlakeEntry dependenciesToFlakeEntry(const ResolvedFlake & resolvedFlak
     return entry;
 }
 
-bool allowedToWrite (HandleLockFile handle)
+bool allowedToWrite(HandleLockFile handle)
 {
-    if (handle == AllPure) return false;
-    else if (handle == TopRefUsesRegistries) return false;
-    else if (handle == UpdateLockFile) return true;
-    else if (handle == UseUpdatedLockFile) return false;
-    else if (handle == RecreateLockFile) return true;
-    else if (handle == UseNewLockFile) return false;
-    else assert(false);
+    return handle == UpdateLockFile || handle == RecreateLockFile;
 }
 
-bool recreateLockFile (HandleLockFile handle)
+bool recreateLockFile(HandleLockFile handle)
 {
-    if (handle == AllPure) return false;
-    else if (handle == TopRefUsesRegistries) return false;
-    else if (handle == UpdateLockFile) return false;
-    else if (handle == UseUpdatedLockFile) return false;
-    else if (handle == RecreateLockFile) return true;
-    else if (handle == UseNewLockFile) return true;
-    else assert(false);
+    return handle == RecreateLockFile || handle == UseNewLockFile;
 }
 
-bool allowedToUseRegistries (HandleLockFile handle, bool isTopRef)
+bool allowedToUseRegistries(HandleLockFile handle, bool isTopRef)
 {
     if (handle == AllPure) return false;
     else if (handle == TopRefUsesRegistries) return isTopRef;
@@ -433,11 +421,11 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
         if (i != lockFile.nonFlakeEntries.end()) {
             NonFlake nonFlake = getNonFlake(state, i->second.ref, nonFlakeInfo.first);
             if (nonFlake.hash != i->second.contentHash)
-                throw Error("the content hash of flakeref %s doesn't match", i->second.ref.to_string());
+                throw Error("the content hash of flakeref '%s' doesn't match", i->second.ref.to_string());
             deps.nonFlakeDeps.push_back(nonFlake);
         } else {
             if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
-                throw Error("the lockfile requires updating nonflake dependency %s in AllPure mode", nonFlakeInfo.first);
+                throw Error("cannot update non-flake dependency '%s' in pure mode", nonFlakeInfo.first);
             deps.nonFlakeDeps.push_back(getNonFlake(state, nonFlakeInfo.second, nonFlakeInfo.first));
         }
     }
@@ -447,11 +435,11 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
         if (i != lockFile.flakeEntries.end()) { // Propagate lockFile downwards if possible
             ResolvedFlake newResFlake = resolveFlakeFromLockFile(state, i->second.ref, handleLockFile, entryToLockFile(i->second));
             if (newResFlake.flake.hash != i->second.contentHash)
-                throw Error("the content hash of flakeref %s doesn't match", i->second.ref.to_string());
+                throw Error("the content hash of flakeref '%s' doesn't match", i->second.ref.to_string());
             deps.flakeDeps.insert_or_assign(newFlakeRef, newResFlake);
         } else {
             if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
-                throw Error("the lockfile requires updating flake dependency %s in AllPure mode", newFlakeRef.to_string());
+                throw Error("cannot update flake dependency '%s' in pure mode", newFlakeRef.to_string());
             deps.flakeDeps.insert_or_assign(newFlakeRef, resolveFlakeFromLockFile(state, newFlakeRef, handleLockFile));
         }
     }
@@ -485,9 +473,10 @@ ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLoc
                 // Hack: Make sure that flake.lock is visible to Git, so it ends up in the Nix store.
                 runProgram("git", true, { "-C", refData->path, "add",
                                           (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock" });
-            } else std::cout << "Cannot write lockfile because the FlakeRef isn't of the form IsPath." << std::endl;
+            } else
+                warn("cannot write lockfile of remote flake '%s'", topRef);
         } else if (handleLockFile != AllPure && handleLockFile != TopRefUsesRegistries)
-            std::cout << "Using updating lockfile without writing it to file" << std::endl;
+            warn("using updated lockfile without writing it to file");
     }
 
     return resFlake;