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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).
This commit is contained in:
Eelco Dolstra 2024-07-03 16:37:26 +02:00
parent 9d95c228ee
commit 1ff186fc6e
3 changed files with 10 additions and 0 deletions
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6
src/nix/flake.cc
View file

@ -233,6 +233,8 @@ 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(
@ -265,6 +267,10 @@ 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);

1
tests/functional/flakes/flakes.sh
View file

@ -195,6 +195,7 @@ json=$(nix flake metadata flake1 --json | jq .)
[[ -d $(echo "$json" | jq -r .path) ]]
[[ $(echo "$json" | jq -r .lastModified) = $(git -C "$flake1Dir" log -n1 --format=%ct) ]]
hash1=$(echo "$json" | jq -r .revision)
[[ -n $(echo "$json" | jq -r .fingerprint) ]]
echo foo > "$flake1Dir/foo"
git -C "$flake1Dir" add $flake1Dir/foo

3
tests/nixos/tarball-flakes.nix
View file

@ -70,6 +70,9 @@ in
# Check that we got redirected to the immutable URL.
assert info["locked"]["url"] == "http://localhost/stable/${nixpkgs.rev}.tar.gz"
# Check that we got a fingerprint for caching.
assert info["fingerprint"]
# Check that we got the rev and revCount attributes.
assert info["revision"] == "${nixpkgs.rev}"
assert info["revCount"] == 1234