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43 lines
2.0 KiB
Nix
43 lines
2.0 KiB
Nix
{ indexStateHashesPath, nix-tools, coreutils, nix, writeShellScriptBin, stdenv }:
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with builtins;
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with stdenv.lib;
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writeShellScriptBin "update-index-state-hashes" ''
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# get all the tools we need. I wonder if there is a better way? But I couldn't find
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# any buildInputs for writeShellScriptBin :-/
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export PATH="${getBin coreutils}/bin:${getBin nix-tools}/bin:${getBin nix}/bin:$PATH"
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# We'll take the last element from the indexStatesHashes file via nix and get the name.
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# This is the last timestamp recorded in the file (implicit assumption: the file is
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# ordered, and nix preserved that order when parsing it into a attributeset).
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start=${let ls = attrNames (import indexStateHashesPath); in elemAt ls (length ls - 1)}
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# The indexStatesHashesPath looks like
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# {
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# ...
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# }
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# Idea: take everything but drop the last line, and can then just append each new
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# entry and finally close the file with "}". We'll do this by echoing to STDOUT!
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# Old file without the closing curly brace.
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cat ${indexStateHashesPath} | head -n -1
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# Parse the $start date, and now into seconds with the date command. Then walk
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# them by 86400 (24*60*60) days. We need to format the output with '%.f' as we
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# don't want fractional values.
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for d in $(seq -f '%.f' $(date -u +%s -d $start) 86400 $(date -u +%s)) ; do
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# turn the step date $d into a YYYY-MM-DD string, and generate the truncated
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# index, compute it's hash and echo "$dT00:00:00Z" = "$sha256"; to STDOUT.
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dt=$(date -u +%Y-%m-%d -d @$d)
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# ensure we don't generate the $start date twice (skip the first invocation).
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if [[ "''${dt}T00:00:00Z" != "$start" ]]; then
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truncate-index -o ''${dt}-01-index.tar.gz -i ${fetchurl "https://hackage.haskell.org/01-index.tar.gz"} -s "''${dt}T00:00:00Z"
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sha256=$(nix-hash --flat --type sha256 ''${dt}-01-index.tar.gz)
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echo " \"''${dt}T00:00:00Z\" = \"''${sha256}\";"
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fi
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done
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# emit the final closing brace.
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echo '}'
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''
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