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nix flake metadata: Show flake fingerprint

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This is useful for testing/debugging and maybe for sharing eval caches
(since it tells you what file in ~/.cache/nix/eval-cache-v5 to copy).

(cherry picked from commit 1ff186fc6e)
This commit is contained in:
Eelco Dolstra 2024-07-03 16:37:26 +02:00 • committed by github-actions[bot]
parent 241c539f6f
commit e38f45b19f
3 changed files with 10 additions and 0 deletions
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6
src/nix/flake.cc
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@ -232,6 +232,8 @@ struct CmdFlakeMetadata : FlakeCommand, MixJSON
j["lastModified"] = *lastModified;
j["path"] = storePath;
j["locks"] = lockedFlake.lockFile.toJSON().first;
if (auto fingerprint = lockedFlake.getFingerprint(store))
j["fingerprint"] = fingerprint->to_string(HashFormat::Base16, false);
logger->cout("%s", j.dump());
} else {
logger->cout(
@ -264,6 +266,10 @@ struct CmdFlakeMetadata : FlakeCommand, MixJSON
logger->cout(
ANSI_BOLD "Last modified:" ANSI_NORMAL " %s",
std::put_time(std::localtime(&*lastModified), "%F %T"));
if (auto fingerprint = lockedFlake.getFingerprint(store))
logger->cout(
ANSI_BOLD "Fingerprint:" ANSI_NORMAL " %s",
fingerprint->to_string(HashFormat::Base16, false));
if (!lockedFlake.lockFile.root->inputs.empty())
logger->cout(ANSI_BOLD "Inputs:" ANSI_NORMAL);