161 lines
4.4 KiB
Bash
Executable file
161 lines
4.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -eu
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NEW_REV=
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PREVIOUS_REV="$(git rev-parse @~)"
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OUTPUT_FILE=/dev/stdout
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FLAKE_OUTPUTS=()
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NIX_BUILD_ARGS=()
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print_err() {
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printf "%s\n" "$1" >&2
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}
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sanitize_output() {
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if [ "$OUTPUT_FILE" != "/dev/stdout" ]; then
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sed 's/\x1b\[[0-9;]*m//g'
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else
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cat
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fi
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}
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add_shell() {
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local SYSTEM
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if [ $# -gt 0 ] && [ -n "$1" ]; then
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SYSTEM="$1"
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else
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SYSTEM="$(nix eval --raw --impure --expr 'builtins.currentSystem')"
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fi
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# Use 'inputDerivation' attribute to make sure that it is build-able
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FLAKE_OUTPUTS+=("devShell.$SYSTEM.inputDerivation")
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}
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add_host() {
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FLAKE_OUTPUTS+=("nixosConfigurations.$1.config.system.build.toplevel")
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}
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usage() {
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print_err "Usage: $0 [option]... [-- [nix build option]...]"
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print_err ""
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print_err " -h, --help"
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print_err " print this usage screen and exit"
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print_err " -f, --flake-output"
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print_err " specify which flake output's closures should be diffed,"
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print_err " can be used multiple times to specify multiple outputs"
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print_err " -o, --output"
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print_err " specify where to output the closure diffs,"
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print_err " defaults to printing to standard output"
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print_err " -n, --new-rev"
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print_err " which git revision should be considered the 'new' state,"
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print_err " defaults to current state"
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print_err " -p, --previous-rev"
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print_err " which git revision should be considered the 'previous' state,"
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print_err " defaults to HEAD~"
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print_err " --host [name]"
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print_err " specify the name of a NixOS output configuration whose"
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print_err " closure should be diffed, can be used multiple times"
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print_err " if no host name is given, defaults to current hostname"
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print_err " --shell [system]"
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print_err " specify a specific system's devShell output whose closure"
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print_err " should be diffed, can be used multiple times"
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print_err " if no system is given, defaults to current system"
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print_err ""
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print_err "when no flake outputs are specified, automatically queries for"
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print_err "all NixOS configurations, and devShell for current system"
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}
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is_option() {
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[ $# -gt 0 ] && [[ $1 =~ ^(-.|--.*)$ ]]
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}
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parse_args() {
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while [ $# -gt 0 ]; do
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opt="$1"
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shift
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case "$opt" in
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-h|--help)
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usage
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exit
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;;
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-f|--flake-output)
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FLAKE_OUTPUTS+=("$1")
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shift
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;;
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-o|--output)
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OUTPUT_FILE="$1"
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shift
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;;
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-n|--new-rev)
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NEW_REV="$(git rev-parse "$1")"
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shift
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;;
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-p|--previous-rev)
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PREVIOUS_REV="$(git rev-parse "$1")"
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shift
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;;
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--host)
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if [ $# -gt 0 ] && ! is_option "$1"; then
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add_host "$1"
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shift
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else
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add_host "$(hostname)"
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fi
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;;
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--shell)
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if [ $# -gt 0 ] && ! is_option "$1"; then
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add_shell "$1"
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shift
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else
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add_shell
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fi
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;;
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--)
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NIX_BUILD_ARGS=("$@")
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break
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;;
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*)
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print_err "Unknown argument '$opt'"
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usage
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exit 1
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;;
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esac
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done
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}
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list_nixos_configurations() {
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nix eval '.#nixosConfigurations' \
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--apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
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--raw
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}
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diff_output() {
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local PREV NEW;
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PREV="$(mktemp --dry-run)"
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NEW="$(mktemp --dry-run)"
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nix build "${NIX_BUILD_ARGS[@]}" ".?rev=${PREVIOUS_REV}#$1" -o "$PREV"
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nix build "${NIX_BUILD_ARGS[@]}" ".${NEW_REV:+?rev=$NEW_REV}#$1" -o "$NEW"
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{
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# shellcheck disable=SC2016
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printf 'Closure diff for `%s`:\n```\n' "$1"
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nix store diff-closures "$PREV" "$NEW" | sanitize_output
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printf '```\n\n'
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} >> "$OUTPUT_FILE"
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}
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parse_args "$@"
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if [ "${#FLAKE_OUTPUTS[@]}" -eq 0 ]; then
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for host in $(list_nixos_configurations); do
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add_host "$host"
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done
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add_shell
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fi
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for out in "${FLAKE_OUTPUTS[@]}"; do
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diff_output "$out"
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done
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