From 42707d29c994c30956608b9c9f10cbaf1d00add4 Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <git#v1@kaction.cc>
Date: Mon, 25 Jan 2021 00:00:00 +0000
Subject: [PATCH] nix-sys: generate build system inside of build system

This makes debugging easier that when installation exists only inside
Nix "installPhase".
---
 system-v2/nix-sys/all.do        | 2 +-
 system-v2/nix-sys/default.nix   | 6 +-----
 system-v2/nix-sys/install.in    | 6 ++++++
 system-v2/nix-sys/install.sh.do | 7 +++++++
 4 files changed, 15 insertions(+), 6 deletions(-)
 create mode 100644 system-v2/nix-sys/install.in
 create mode 100644 system-v2/nix-sys/install.sh.do

diff --git a/system-v2/nix-sys/all.do b/system-v2/nix-sys/all.do
index 165b939..2ebf378 100755
--- a/system-v2/nix-sys/all.do
+++ b/system-v2/nix-sys/all.do
@@ -1,2 +1,2 @@
 #!/bin/sh
-exec redo-ifchange nix-sys .gitignore
+exec redo-ifchange .gitignore nix-sys install.sh
diff --git a/system-v2/nix-sys/default.nix b/system-v2/nix-sys/default.nix
index 7e520f4..eeed40e 100644
--- a/system-v2/nix-sys/default.nix
+++ b/system-v2/nix-sys/default.nix
@@ -19,11 +19,7 @@ in stdenv.mkDerivation {
       > conf/feature-chattr
   '';
   buildPhase = "redo";
-  installPhase = ''
-    mkdir -p $out/bin
-    install -m555 ./nix-sys $out/bin/nix-sys
-    mv index.cdb $cdb
-  '';
+  installPhase = "./install.sh";
   postFixup = "rm -fr $out/nix-support";
   manifest = builtins.toJSON manifest;
 }
diff --git a/system-v2/nix-sys/install.in b/system-v2/nix-sys/install.in
new file mode 100644
index 0000000..05229b7
--- /dev/null
+++ b/system-v2/nix-sys/install.in
@@ -0,0 +1,6 @@
+#!/bin/sh -eu
+redo
+
+install -d "@out@/bin"
+install -m 755 ./nix-sys "@out@/bin"
+install -m 444 ./index.cdb "@cdb@"
diff --git a/system-v2/nix-sys/install.sh.do b/system-v2/nix-sys/install.sh.do
new file mode 100644
index 0000000..e84b859
--- /dev/null
+++ b/system-v2/nix-sys/install.sh.do
@@ -0,0 +1,7 @@
+#!/bin/sh
+redo-ifchange conf/out conf/cdb install.in
+out=$(cat conf/out)
+cdb=$(cat conf/cdb)
+
+sed -e "s#@out@#${out}#g" -e "s#@cdb@#${cdb}#g" < install.in > "$3"
+chmod +x "$3"
-- 
2.38.5