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133 lines
3.9 KiB
133 lines
3.9 KiB
#!/usr/bin/env bash
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set -e
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# --print: avoid dependency on environment
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optPrint=
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if [ "$1" == "--print" ]; then
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optPrint=true
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shift
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fi
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if [ "$#" != 1 ] && [ "$#" != 2 ]; then
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cat <<EOF
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Usage: $0 [--print] from-commit-spec [to-commit-spec]
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You need to be in a git-controlled nixpkgs tree.
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The current state of the tree will be used if the second commit is missing.
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Examples:
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effect of latest commit:
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$ $0 HEAD^
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$ $0 --print HEAD^
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effect of the whole patch series for 'staging' branch:
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$ $0 origin/staging staging
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EOF
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exit 1
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fi
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# A slightly hacky way to get the config.
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parallel="$(echo 'config.rebuild-amount.parallel or false' | nix-repl . 2>/dev/null \
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| grep -v '^\(nix-repl.*\)\?$' | tail -n 1 || true)"
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echo "Estimating rebuild amount by counting changed Hydra jobs (parallel=${parallel:-unset})."
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toRemove=()
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cleanup() {
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rm -rf "${toRemove[@]}"
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}
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trap cleanup EXIT
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MKTEMP='mktemp --tmpdir nix-rebuild-amount-XXXXXXXX'
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nixexpr() {
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cat <<EONIX
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let
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lib = import $1/lib;
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hydraJobs = import $1/pkgs/top-level/release.nix
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# Compromise: accuracy vs. resources needed for evaluation.
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{ supportedSystems = cfg.systems or [ "x86_64-linux" "x86_64-darwin" ]; };
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cfg = (import $1 {}).config.rebuild-amount or {};
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recurseIntoAttrs = attrs: attrs // { recurseForDerivations = true; };
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# hydraJobs leaves recurseForDerivations as empty attrmaps;
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# that would break nix-env and we also need to recurse everywhere.
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tweak = lib.mapAttrs
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(name: val:
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if name == "recurseForDerivations" then true
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else if lib.isAttrs val && val.type or null != "derivation"
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then recurseIntoAttrs (tweak val)
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else val
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);
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# Some of these contain explicit references to platform(s) we want to avoid;
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# some even (transitively) depend on ~/.nixpkgs/config.nix (!)
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blacklist = [
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"tarball" "metrics" "manual"
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"darwin-tested" "unstable" "stdenvBootstrapTools"
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"moduleSystem" "lib-tests" # these just confuse the output
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];
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in
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tweak (builtins.removeAttrs hydraJobs blacklist)
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EONIX
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}
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# Output packages in tree $2 that weren't in $1.
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# Changing the output hash or name is taken as a change.
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# Extra nix-env parameters can be in $3
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newPkgs() {
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# We use files instead of pipes, as running multiple nix-env processes
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# could eat too much memory for a standard 4GiB machine.
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local -a list
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for i in 1 2; do
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local l="$($MKTEMP)"
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list[$i]="$l"
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toRemove+=("$l")
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local expr="$($MKTEMP)"
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toRemove+=("$expr")
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nixexpr "${!i}" > "$expr"
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nix-env -f "$expr" -qaP --no-name --out-path --show-trace $3 \
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| sort > "${list[$i]}" &
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if [ "$parallel" != "true" ]; then
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wait
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fi
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done
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wait
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comm -13 "${list[@]}"
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}
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# Prepare nixpkgs trees.
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declare -a tree
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for i in 1 2; do
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if [ -n "${!i}" ]; then # use the given commit
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dir="$($MKTEMP -d)"
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tree[$i]="$dir"
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toRemove+=("$dir")
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git clone --shared --no-checkout --quiet . "${tree[$i]}"
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(cd "${tree[$i]}" && git checkout --quiet "${!i}")
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else #use the current tree
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tree[$i]="$(pwd)"
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fi
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done
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newlist="$($MKTEMP)"
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toRemove+=("$newlist")
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# Notes:
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# - the evaluation is done on x86_64-linux, like on Hydra.
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# - using $newlist file so that newPkgs() isn't in a sub-shell (because of toRemove)
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newPkgs "${tree[1]}" "${tree[2]}" '--argstr system "x86_64-linux"' > "$newlist"
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# Hacky: keep only the last word of each attribute path and sort.
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sed -n 's/\([^. ]*\.\)*\([^. ]*\) .*$/\2/p' < "$newlist" \
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| sort | uniq -c
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if [ -n "$optPrint" ]; then
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echo
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cat "$newlist"
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fi
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