nixpkgs/nixos/modules/installer/tools/nixos-version.sh

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#! @runtimeShell@
# shellcheck shell=bash
case "$1" in
-h|--help)
exec man nixos-version
exit 1
;;
--hash|--revision)
if ! [[ @revision@ =~ ^[0-9a-f]+$ ]]; then
echo "$0: Nixpkgs commit hash is unknown" >&2
exit 1
fi
echo "@revision@"
;;
--configuration-revision)
if [[ "@configurationRevision@" =~ "@" ]]; then
echo "$0: configuration revision is unknown" >&2
exit 1
fi
echo "@configurationRevision@"
;;
--json)
cat <<EOF
@json@
EOF
;;
*)
echo "@version@ (@codeName@)"
;;
esac