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Introduce --json-format for nix path-info

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As discussed today at great length in the Nix meeting, we don't want to
break the format, but we also don't want to impede the improvement of
JSON formats. The solution is to add a new flag for control the output
format.

Note that prior to the release, we may want to replace `--json
--json-format N` with `--json=N`, but this is being left for a separate
PR, as we don't yet have `=` support for CLI flags.
This commit is contained in:
John Ericson 2025-12-03 17:07:00 -05:00
parent 69920f9557
commit 1ad13a1423
36 changed files with 464 additions and 132 deletions
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6
tests/nixos/fetchers-substitute.nix
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@ -117,12 +117,12 @@
tarball_store_path = json.loads(tarball_store_path_json)
# Get the NAR hash of the unpacked tarball in SRI format
path_info_json = substituter.succeed(f"nix path-info --json {tarball_store_path}").strip()
path_info_json = substituter.succeed(f"nix path-info --json-format 2 --json {tarball_store_path}").strip()
path_info_dict = json.loads(path_info_json)
# nix path-info returns a dict with store paths as keys
narHash_obj = path_info_dict[tarball_store_path]["narHash"]
# Convert from structured format {"algorithm": "sha256", "format": "base64", "hash": "..."} to SRI string
tarball_hash_sri = f"{narHash_obj['algorithm']}-{narHash_obj['hash']}"
# Convert from structured format {"algorithm": "sha256", "format": "base16", "hash": "..."} to SRI string
tarball_hash_sri = substituter.succeed(f"nix hash convert --to sri {narHash_obj['algorithm']}:{narHash_obj['hash']}").strip()
print(f"Tarball NAR hash (SRI): {tarball_hash_sri}")
# Also get the old format hash for fetchTarball (which uses sha256 parameter)