nixos-mailserver/mail-server/dovecot-version.nix

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{ dovecot, gawk, gnused, jq, runCommand }:
runCommand "dovecot-version" {
buildInputs = [dovecot gnused jq];
} ''
jq -n \
--arg dovecot_version "$(dovecot --version |
sed 's/\([0-9.]*\).*/\1/' |
awk -F '.' '{ print $1"."$2"."$3 }')" \
'[$dovecot_version | split("."), ["major", "minor", "patch"]]
| transpose | map( { (.[1]): .[0] | tonumber }) | add' > $out
''