From e7f6744be5460cb4b34086ec8e8991bb311f7144 Mon Sep 17 00:00:00 2001
From: Stefan Junker <mail@stefanjunker.de>
Date: Sun, 4 Nov 2018 22:04:22 +0100
Subject: [PATCH] dotfiles/vcsh: populate nix store with dotfiles mirror

---
 Justfile                                      |  3 +-
 nix/home-manager/profiles/dotfiles.nix        | 24 ++----------
 nix/home-manager/profiles/dotfiles/.gitignore |  1 +
 .../profiles/dotfiles/vcsh.tmpl.nix           | 38 +++++++++++++++++++
 nix/scripts/pre-eval-fixed.sh                 |  5 +++
 5 files changed, 49 insertions(+), 22 deletions(-)
 create mode 100644 nix/home-manager/profiles/dotfiles/.gitignore
 create mode 100644 nix/home-manager/profiles/dotfiles/vcsh.tmpl.nix
 create mode 100755 nix/scripts/pre-eval-fixed.sh

diff --git a/Justfile b/Justfile
index 34fa1e5..eba55da 100755
--- a/Justfile
+++ b/Justfile
@@ -7,9 +7,10 @@ _device action dir +moreargs="":
 	sudo $(set -x; nix-build --no-link --show-trace $(dirname {{dir}})/default.nix -A {{action}} --argstr dir {{dir}} {{moreargs}})
 
 _rebuild-device dir rebuildarg="dry-activate" +moreargs="":
+	#!/usr/bin/env bash
+	nix/scripts/pre-eval-fixed.sh nix/home-manager/profiles/dotfiles/vcsh{.tmpl,}.nix
 	just -v _device rebuild {{dir}} --argstr rebuildarg {{rebuildarg}} {{moreargs}}
 
-
 # Rebulid this device's NixOS
 rebuild-this-device rebuildarg="dry-activate":
 	#!/usr/bin/env bash
diff --git a/nix/home-manager/profiles/dotfiles.nix b/nix/home-manager/profiles/dotfiles.nix
index e0c18f6..2609ee2 100644
--- a/nix/home-manager/profiles/dotfiles.nix
+++ b/nix/home-manager/profiles/dotfiles.nix
@@ -4,28 +4,10 @@
 }:
 
 let
-  repoHttps = "https://gitlab.com/steveeJ/dotfiles.git";
-  repoSsh = "git@gitlab.com:/steveeJ/dotfiles.git";
+  vcshActivationScript = pkgs.callPackage ./dotfiles/vcsh.nix {};
+
 in {
   home.activation.vcsh = config.lib.dag.entryAfter["linkGeneration"] ''
-    $DRY_RUN_CMD ${pkgs.writeScript "activation-script" ''
-    set -e
-    export HOST=$(hostname -s)
-
-    function set_remotes {
-      ${pkgs.vcsh}/bin/vcsh dotfiles remote set-url origin ${repoHttps}
-      ${pkgs.vcsh}/bin/vcsh dotfiles remote set-url --push origin ${repoSsh}
-    }
-
-    if ! test -d $HOME/.config/vcsh/repo.d/dotfiles.git; then
-      echo Cloning dotfiles for $HOST...
-      ${pkgs.vcsh}/bin/vcsh clone -b $HOST ${repoHttps} 
-      set_remotes
-    else
-      echo Updating dotfiles for $HOST...
-      set_remotes
-      ${pkgs.vcsh}/bin/vcsh pull $HOST
-    fi
-    ''};
+    $DRY_RUN_CMD ${vcshActivationScript}
   '';
 }
diff --git a/nix/home-manager/profiles/dotfiles/.gitignore b/nix/home-manager/profiles/dotfiles/.gitignore
new file mode 100644
index 0000000..f3f979e
--- /dev/null
+++ b/nix/home-manager/profiles/dotfiles/.gitignore
@@ -0,0 +1 @@
+vcsh.nix
diff --git a/nix/home-manager/profiles/dotfiles/vcsh.tmpl.nix b/nix/home-manager/profiles/dotfiles/vcsh.tmpl.nix
new file mode 100644
index 0000000..fe99c8d
--- /dev/null
+++ b/nix/home-manager/profiles/dotfiles/vcsh.tmpl.nix
@@ -0,0 +1,38 @@
+{ pkgs
+, repoHttps ? "https://gitlab.com/steveeJ/dotfiles.git"
+, repoSsh ? "git@gitlab.com:/steveeJ/dotfiles.git"
+, ...
+}:
+
+let
+  repoHttps = "https://gitlab.com/steveeJ/dotfiles.git";
+  repoSsh = "git@gitlab.com:/steveeJ/dotfiles.git";
+  repoBareLocal = pkgs.runCommand "fetchbare" {
+      outputHashMode = "recursive";
+      outputHashAlgo = "sha256";
+      outputHash = "0000000000000000000000000000000000000000000000000000";
+    } ''
+      export GIT_SSL_CAINFO=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
+      export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
+      ${pkgs.git}/bin/git clone --mirror ${repoHttps} $out
+    '';
+
+in pkgs.writeScript "activation-script" ''
+    export HOST=$(hostname -s)
+
+    function set_remotes {
+      ${pkgs.vcsh}/bin/vcsh dotfiles remote set-url origin $1
+      ${pkgs.vcsh}/bin/vcsh dotfiles remote set-url --push origin $2
+    }
+
+    if ! test -d $HOME/.config/vcsh/repo.d/dotfiles.git; then
+      echo Cloning dotfiles for $HOST...
+      ${pkgs.vcsh}/bin/vcsh clone -b $HOST ${repoBareLocal} 
+      set_remotes ${repoHttps} ${repoSsh}
+    else
+      set_remotes ${repoBareLocal} ${repoSsh}
+      echo Updating dotfiles for $HOST...
+      ${pkgs.vcsh}/bin/vcsh pull $HOST || true
+      set_remotes ${repoHttps} ${repoSsh}
+    fi
+    ''
diff --git a/nix/scripts/pre-eval-fixed.sh b/nix/scripts/pre-eval-fixed.sh
new file mode 100755
index 0000000..0b22a4f
--- /dev/null
+++ b/nix/scripts/pre-eval-fixed.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+INFILE="${1:?Please set arg1 to INFILE}"
+OUTFILE="${2:?Please set arg2 to OUTFILE}"
+hash=$(nix-build ${INFILE} --arg pkgs 'import <nixpkgs> {}' --arg config 'null' 2>&1 | grep -oE '[0-9a-z]{52}' | head -n1)
+sed -E "s/0{52}/${hash}/" ${INFILE} > ${OUTFILE}