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Allow specifying alternative paths for reading/writing flake locks

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This allows having multiple separate lockfiles for a single
project, which can be useful for testing against different versions of
nixpkgs; it also allows tracking custom input overrides for remote
flakes without requiring local clones of these flakes.

For example, if I want to build Nix against my locally pinned nixpkgs,
and have a lock file tracking this override independently of future
updates to said nixpkgs:

nix flake lock --output-lock-file /tmp/nix-flake.lock --override-input nixpkgs flake:nixpkgs
nix build --reference-lock-file /tmp/nix-flake.lock

Co-Authored-By: Will Fancher <elvishjerricco@gmail.com>
This commit is contained in:
Linus Heckemann 2023-03-13 21:08:52 +01:00
parent 4a96125c3c
commit e91596eb69
3 changed files with 47 additions and 12 deletions
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31
src/libexpr/flake/flake.cc
View file

@ -337,7 +337,8 @@ LockedFlake lockFlake(
// FIXME: symlink attack
auto oldLockFile = LockFile::read(
flake.sourceInfo->actualPath + "/" + flake.lockedRef.subdir + "/flake.lock");
lockFlags.referenceLockFilePath.value_or(
flake.sourceInfo->actualPath + "/" + flake.lockedRef.subdir + "/flake.lock"));
debug("old lock file: %s", oldLockFile);
@ -619,13 +620,20 @@ LockedFlake lockFlake(
debug("new lock file: %s", newLockFile);
auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
auto sourcePath = topRef.input.getSourcePath();
auto outputLockFilePath = sourcePath ? std::optional{*sourcePath + "/" + relPath} : std::nullopt;
if (lockFlags.outputLockFilePath) {
outputLockFilePath = lockFlags.outputLockFilePath;
}
/* Check whether we need to / can write the new lock file. */
if (!(newLockFile == oldLockFile)) {
if (newLockFile != oldLockFile || lockFlags.outputLockFilePath) {
auto diff = LockFile::diff(oldLockFile, newLockFile);
if (lockFlags.writeLockFile) {
if (auto sourcePath = topRef.input.getSourcePath()) {
if (outputLockFilePath) {
if (auto unlockedInput = newLockFile.isUnlocked()) {
if (fetchSettings.warnDirty)
warn("will not write lock file of flake '%s' because it has an unlocked input ('%s')", topRef, *unlockedInput);
@ -633,25 +641,24 @@ LockedFlake lockFlake(
if (!lockFlags.updateLockFile)
throw Error("flake '%s' requires lock file changes but they're not allowed due to '--no-update-lock-file'", topRef);
auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
auto path = *sourcePath + "/" + relPath;
bool lockFileExists = pathExists(path);
bool lockFileExists = pathExists(*outputLockFilePath);
if (lockFileExists) {
auto s = chomp(diff);
if (s.empty())
warn("updating lock file '%s'", path);
warn("updating lock file '%s'", *outputLockFilePath);
else
warn("updating lock file '%s':\n%s", path, s);
warn("updating lock file '%s':\n%s", *outputLockFilePath, s);
} else
warn("creating lock file '%s'", path);
warn("creating lock file '%s'", *outputLockFilePath);
newLockFile.write(path);
newLockFile.write(*outputLockFilePath);
std::optional<std::string> commitMessage = std::nullopt;
if (lockFlags.commitLockFile) {
if (lockFlags.outputLockFilePath) {
throw Error("--commit-lock-file and --output-lock-file are currently incompatible");
}
std::string cm;
cm = fetchSettings.commitLockFileSummary.get();