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Only rewrite the lockfile if it changed

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This removes spurious warnings about failure to write the lockfile.
This commit is contained in:
Eelco Dolstra 2019-05-21 14:55:43 +02:00
parent 818c8da5b8
commit 20a1a65d37
2 changed files with 37 additions and 12 deletions
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28
src/libexpr/primops/flake.cc
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@ -465,31 +465,35 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLockFile handleLockFile)
{
Flake flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
LockFile lockFile;
LockFile oldLockFile;
if (!recreateLockFile (handleLockFile)) {
// If recreateLockFile, start with an empty lockfile
lockFile = readLockFile(flake.storePath + "/flake.lock"); // FIXME: symlink attack
oldLockFile = readLockFile(flake.storePath + "/flake.lock"); // FIXME: symlink attack
}
LockFile lockFile(oldLockFile);
ResolvedFlake resFlake = resolveFlakeFromLockFile(state, topRef, handleLockFile, lockFile, true);
lockFile = entryToLockFile(dependenciesToFlakeEntry(resFlake));
if (allowedToWrite(handleLockFile)) {
if (auto refData = std::get_if<FlakeRef::IsPath>(&topRef.data)) {
writeLockFile(lockFile, refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
if (!(lockFile == oldLockFile)) {
if (allowedToWrite(handleLockFile)) {
if (auto refData = std::get_if<FlakeRef::IsPath>(&topRef.data)) {
writeLockFile(lockFile, refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
// 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 if (handleLockFile != AllPure && handleLockFile != TopRefUsesRegistries)
std::cout << "Using updating lockfile without writing it to file" << std::endl;
// 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 if (handleLockFile != AllPure && handleLockFile != TopRefUsesRegistries)
std::cout << "Using updating lockfile without writing it to file" << std::endl;
}
return resFlake;
}
void updateLockFile (EvalState & state, const FlakeUri & flakeUri, bool recreateLockFile)
void updateLockFile(EvalState & state, const FlakeUri & flakeUri, bool recreateLockFile)
{
FlakeRef flakeRef(flakeUri);
resolveFlake(state, flakeRef, recreateLockFile ? RecreateLockFile : UpdateLockFile);