Write specification for text spec input files #79
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That's a nice surprise! |
Co-authored-by: Marco Esters <mesters@anaconda.com>
cep-??.md
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| If the line `@EXPLICIT` is found, the file is considered explicit. The word `@EXPLICIT` can contain whitespace before and after, but it's not recommended. | ||
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| In explicit files, each package requirement line MUST specify a single, direct URL (as in RFC 3986) to a conda artifact. File paths are also supported, but they SHOULD be preferrably expressed as `file://` URLs. Relative paths are allowed, and will be processed as relative to the working directory, not the input file parent directory. Each URL can be immediately followed by an anchor tag (`#<hash>`) that encodes the expected MD5 checksum of the downloaded artifact. More specifically, whitespace-stripped lines SHOULD be parsable by this regex: |
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Not sure if this is used in the wild but can it also be followed by a sha256 hash? E.g. sha256:hash
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We would need to check if that doesn't break conda's regex. It seems to be limited to 32 hex (lowercase!) characters, so it should be ok as long as we have a different-length string.
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That said, I'm inclined to cover that in separate CEP because it's not really an existing format? Is there an implementation out there that understands sha256's?
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Ah, yes, I see it here: https://github.com/mamba-org/rattler/blob/31e16aa77f7d315de4ffe078b18a95a0e077ad6f/crates/rattler_conda_types/src/explicit_environment_spec.rs#L66-L96
conda does not support it so it's not part of the "classic" implementation / aka de facto standard. Would you like to have sha256's added here?
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Ended up adding conda/conda#14048 as a result of this conversation, let's see how it feels. Note it only adds support for the unprefixed sha256.
| ## Reference | ||
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| - [Explicit URL regex](https://github.com/conda/conda/blob/841d9d57fd96ad27cda4b7c43549104a96f961ce/conda/misc.py#L50-L54) | ||
| - [`explicit()` implementation in `conda`](https://github.com/conda/conda/blob/841d9d57fd96ad27cda4b7c43549104a96f961ce/conda/misc.py#L57-L145) |
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For what it's worth this is the implementation in rattler: https://github.com/mamba-org/rattler/blob/main/crates/rattler_conda_types/src/explicit_environment_spec.rs
Although I don't think it follows the specs from this CEP to the letter.
Standardizing our simplest input file. Should not be too controversial :P
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