124 lines
3.3 KiB
Bash
Executable file
124 lines
3.3 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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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 ""
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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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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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INPUTS+="$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 "$1")"
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shift
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;;
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--)
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NIX_BUILD_ARGS=("$@")
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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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fill_default_outputs() {
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for host in $(list_nixos_configurations); do
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FLAKE_OUTPUTS+=("nixosConfigurations.$host.config.system.build.toplevel")
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done
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# Use 'inputDerivation' attribute to make sure that it is build-able
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FLAKE_OUTPUTS+=("devShell.$(nix eval --raw --impure --expr 'builtins.currentSystem').inputDerivation")
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}
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diff_output() {
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local PREV NEW;
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PREV="$(@mktemp@ --dry-run)"
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NEW="$(@mktemp@ --dry-run)"
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nix build "${NIX_BUILD_ARGS[@]}" -v ".?rev=${PREVIOUS_REV}#$1" -o "$PREV"
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nix build "${NIX_BUILD_ARGS[@]}" -v ".${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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fill_default_outputs
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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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