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-rwxr-xr-xmaintainers/scripts/rebuild-amount.sh133
1 files changed, 133 insertions, 0 deletions
diff --git a/maintainers/scripts/rebuild-amount.sh b/maintainers/scripts/rebuild-amount.sh
new file mode 100755
index 00000000000..bedd352db5f
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+++ b/maintainers/scripts/rebuild-amount.sh
@@ -0,0 +1,133 @@
+#!/usr/bin/env bash
+set -e
+
+# --print: avoid dependency on environment
+optPrint=
+if [ "$1" == "--print" ]; then
+    optPrint=true
+    shift
+fi
+
+if [ "$#" != 1 ] && [ "$#" != 2 ]; then
+    cat <<EOF
+    Usage: $0 [--print] from-commit-spec [to-commit-spec]
+        You need to be in a git-controlled nixpkgs tree.
+        The current state of the tree will be used if the second commit is missing.
+
+        Examples:
+          effect of latest commit:
+              $ $0 HEAD^
+              $ $0 --print HEAD^
+          effect of the whole patch series for 'staging' branch:
+              $ $0 origin/staging staging
+EOF
+    exit 1
+fi
+
+# A slightly hacky way to get the config.
+parallel="$(echo 'config.rebuild-amount.parallel or false' | nix-repl . 2>/dev/null \
+            | grep -v '^\(nix-repl.*\)\?$' | tail -n 1 || true)"
+
+echo "Estimating rebuild amount by counting changed Hydra jobs (parallel=${parallel:-unset})."
+
+toRemove=()
+
+cleanup() {
+    rm -rf "${toRemove[@]}"
+}
+trap cleanup EXIT SIGINT SIGQUIT ERR
+
+MKTEMP='mktemp --tmpdir nix-rebuild-amount-XXXXXXXX'
+
+nixexpr() {
+    cat <<EONIX
+        let
+          lib = import $1/lib;
+          hydraJobs = import $1/pkgs/top-level/release.nix
+            # Compromise: accuracy vs. resources needed for evaluation.
+            { supportedSystems = cfg.systems or [ "x86_64-linux" "x86_64-darwin" ]; };
+          cfg = (import $1 {}).config.rebuild-amount or {};
+
+          recurseIntoAttrs = attrs: attrs // { recurseForDerivations = true; };
+
+          # hydraJobs leaves recurseForDerivations as empty attrmaps;
+          # that would break nix-env and we also need to recurse everywhere.
+          tweak = lib.mapAttrs
+            (name: val:
+              if name == "recurseForDerivations" then true
+              else if lib.isAttrs val && val.type or null != "derivation"
+                      then recurseIntoAttrs (tweak val)
+              else val
+            );
+
+          # Some of these contain explicit references to platform(s) we want to avoid;
+          # some even (transitively) depend on ~/.nixpkgs/config.nix (!)
+          blacklist = [
+            "tarball" "metrics" "manual"
+            "darwin-tested" "unstable" "stdenvBootstrapTools"
+            "moduleSystem" "lib-tests" # these just confuse the output
+          ];
+
+        in
+          tweak (builtins.removeAttrs hydraJobs blacklist)
+EONIX
+}
+
+# Output packages in tree $2 that weren't in $1.
+# Changing the output hash or name is taken as a change.
+# Extra nix-env parameters can be in $3
+newPkgs() {
+    # We use files instead of pipes, as running multiple nix-env processes
+    # could eat too much memory for a standard 4GiB machine.
+    local -a list
+    for i in 1 2; do
+        local l="$($MKTEMP)"
+        list[$i]="$l"
+        toRemove+=("$l")
+
+        local expr="$($MKTEMP)"
+        toRemove+=("$expr")
+        nixexpr "${!i}" > "$expr"
+
+        nix-env -f "$expr" -qaP --no-name --out-path --show-trace $3 \
+            | sort > "${list[$i]}" &
+
+        if [ "$parallel" != "true" ]; then
+            wait
+        fi
+    done
+
+    wait
+    comm -13 "${list[@]}"
+}
+
+# Prepare nixpkgs trees.
+declare -a tree
+for i in 1 2; do
+    if [ -n "${!i}" ]; then # use the given commit
+        dir="$($MKTEMP -d)"
+        tree[$i]="$dir"
+        toRemove+=("$dir")
+
+        git clone --shared --no-checkout --quiet . "${tree[$i]}"
+        (cd "${tree[$i]}" && git checkout --quiet "${!i}")
+    else #use the current tree
+        tree[$i]="$(pwd)"
+    fi
+done
+
+newlist="$($MKTEMP)"
+toRemove+=("$newlist")
+# Notes:
+#    - the evaluation is done on x86_64-linux, like on Hydra.
+#    - using $newlist file so that newPkgs() isn't in a sub-shell (because of toRemove)
+newPkgs "${tree[1]}" "${tree[2]}" '--argstr system "x86_64-linux"' > "$newlist"
+
+# Hacky: keep only the last word of each attribute path and sort.
+sed -n 's/\([^. ]*\.\)*\([^. ]*\) .*$/\2/p' < "$newlist" \
+    | sort | uniq -c
+
+if [ -n "$optPrint" ]; then
+    echo
+    cat "$newlist"
+fi