3 files changed, 73 insertions, 0 deletions
diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index 42df3f053..48cf7971b 100644
--- a/krebs/3modules/default.nix
+++ b/krebs/3modules/default.nix
@@ -24,6 +24,7 @@ let
       ./go.nix
       ./hidden-ssh.nix
       ./htgen.nix
+      ./iana-etc.nix
       ./iptables.nix
       ./kapacitor.nix
       ./monit.nix
diff --git a/krebs/3modules/iana-etc.nix b/krebs/3modules/iana-etc.nix
new file mode 100644
index 000000000..f6d47f27e
--- /dev/null
+++ b/krebs/3modules/iana-etc.nix
@@ -0,0 +1,55 @@
+with import <stockholm/lib>;
+{ config, pkgs, ... }: {
+
+  options.krebs.iana-etc.services = mkOption {
+    default = {};
+    type = types.attrsOf (types.submodule ({ config, ... }: {
+      options = {
+        port = mkOption {
+          default = config._module.args.name;
+          type = types.addCheck types.str (test "[1-9][0-9]*");
+        };
+      } // genAttrs ["tcp" "udp"] (protocol: mkOption {
+        default = null;
+        type = types.nullOr (types.submodule {
+          options = {
+            name = mkOption {
+              type = types.str;
+            };
+          };
+        });
+      });
+    }));
+  };
+
+  config.environment.etc = mkIf (config.krebs.iana-etc.services != {})  {
+    services.source = mkForce (pkgs.runCommand "krebs-iana-etc" {} ''
+      exec < ${pkgs.iana_etc}/etc/services
+      exec > $out
+      awk -F '[ /]+' '
+        BEGIN {
+          port=0
+        }
+        ${concatMapStringsSep "\n" (entry: ''
+          $2 == ${entry.port} {
+            port=$2
+            next
+          }
+          port == ${entry.port} {
+            ${concatMapStringsSep "\n"
+              (proto: let
+                s = "${entry.${proto}.name} ${entry.port}/${proto}";
+              in
+                "print ${toJSON s}")
+              (filter (proto: entry.${proto} != null) ["tcp" "udp"])}
+            port=0
+          }
+        '') (attrValues config.krebs.iana-etc.services)}
+        {
+          print $0
+        }
+      '
+    '');
+  };
+
+}
diff --git a/krebs/5pkgs/simple/git-preview.nix b/krebs/5pkgs/simple/git-preview.nix
new file mode 100644
index 000000000..d6c9579a7
--- /dev/null
+++ b/krebs/5pkgs/simple/git-preview.nix
@@ -0,0 +1,17 @@
+{ coreutils, git, writeDashBin }:
+
+writeDashBin "git-preview" ''
+  set -efu
+  head_commit=$(${git}/bin/git log -1 --format=%H)
+  merge_commit=$1; shift
+  merge_message='Merge for git-preview'
+  preview_dir=$(${coreutils}/bin/mktemp --tmpdir -d git-preview.XXXXXXXX)
+  preview_branch=$(${coreutils}/bin/basename "$preview_dir")
+  ${git}/bin/git worktree add -b "$preview_branch" "$preview_dir" >/dev/null
+  ${git}/bin/git -C "$preview_dir" checkout "$head_commit"
+  ${git}/bin/git -C "$preview_dir" merge -m "$merge_message" "$merge_commit"
+  ${git}/bin/git -C "$preview_dir" diff "$head_commit.." "$@" &
+  ${git}/bin/git branch -fd "$preview_branch"
+  ${coreutils}/bin/rm -fR "$preview_dir"
+  wait
+''