sops-gpg-adapter: port to nix-shell

hosts/common/programs/firefox.nix

@@ -263,7 +263,7 @@ in
           # TODO: find a way to not expose ~/.ssh to firefox
           # - unlock sops at login (or before firefox launch)?
           # - see if ssh has a more formal type of subkey system?
-          ".ssh/id_ed25519"
+          # ".ssh/id_ed25519"
           # ".config/sops"
           "knowledge/secrets/accounts"
         ];

hosts/common/programs/sane-scripts.nix

@@ -175,6 +175,16 @@ in
       ];
     };
     "sane-scripts.secrets-unlock".fs.".config/sops".dir = {};
+    # automatically unlock the secrets at login.
+    # the alternative is to do it on-demand, which means giving lots of stuff access to my ssh key.
+    "sane-scripts.secrets-unlock".fs.".profile".symlink.text = ''
+      maybeUnlockSecrets() {
+        if test -f ~/.ssh/id_ed25519; then
+          sane-secrets-unlock
+        fi
+      }
+      sessionCommands+=('maybeUnlockSecrets')
+    '';
 
     # sane-secrets-dump is a thin wrapper around sops + some utilities.
     # really i should sandbox just the utilities

pkgs/additional/sane-scripts/src/sane-secrets-unlock

@@ -1,7 +1,13 @@
 #!/usr/bin/env nix-shell
 #!nix-shell -i bash -p bash -p coreutils-full -p openssh -p ssh-to-age
 # unlocks the SOPS store (i.e. populate a SOPS key from the user's SSH key)
-set -ex
+set -e
+
+if test -f ~/.config/sops/age/keys.txt; then
+  exit
+fi
+
+set -x
 
 mkdir -p ~/.config/sops/age
 

pkgs/patched/browserpass/default.nix

@@ -1,29 +1,25 @@
-{ lib
-, browserpass
-, bash
-, fetchFromGitea
-, gnused
-, sane-scripts
-, sops
-, stdenv
-, substituteAll
+{
+  bash,
+  browserpass,
+  fetchFromGitea,
+  gnused,
+  lib,
+  sane-scripts,
+  sops,
+  static-nix-shell,
+  stdenv,
+  substituteAll,
 }:
 
 let
-  sane-browserpass-gpg = stdenv.mkDerivation {
-    pname = "sane-browserpass-gpg";
-    version = "0.1.0";
-    src = ./.;
-
-    inherit bash gnused sops;
-    sane_secrets_unlock = sane-scripts.secrets-unlock;  # XXX: must be snake_case
-    installPhase = ''
-      mkdir -p $out/bin
-      substituteAll ${./sops-gpg-adapter} $out/bin/gpg
-      chmod +x $out/bin/gpg
-      ln -s $out/bin/gpg $out/bin/gpg2
+  sops-gpg-adapter = static-nix-shell.mkBash {
+    pname = "sops-gpg-adapter";
+    srcRoot = ./.;
+    pkgs = [ "gnused" "sane-scripts.secrets-unlock" "sops" ];
+    postInstall = ''
+      ln -s sops-gpg-adapter $out/bin/gpg
+      ln -s sops-gpg-adapter $out/bin/gpg2
     '';
-
   };
 in
   browserpass.overrideAttrs (upstream: {
@@ -39,7 +35,7 @@ in
       make install
 
       wrapProgram $out/bin/browserpass \
-        --prefix PATH : ${lib.makeBinPath [ sane-browserpass-gpg ]}
+        --prefix PATH : ${lib.makeBinPath [ sops-gpg-adapter ]}
 
       # This path is used by our firefox wrapper for finding native messaging hosts
       mkdir -p $out/lib/mozilla/native-messaging-hosts
@@ -47,6 +43,6 @@ in
     '';
 
     passthru = (upstream.passthru or {}) // {
-      inherit sane-browserpass-gpg;
+      inherit sops-gpg-adapter;
     };
   })

pkgs/patched/browserpass/sops-gpg-adapter

@@ -1,14 +1,15 @@
-#! @bash@/bin/sh
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p bash -p gnused -p sane-scripts.secrets-unlock -p sops
 
 # browserpass "validates" the gpg binary by invoking it with --version
 if [ "$1" = "--version" ]
 then
-  echo "sane-browserpass-gpg @version@";
+  echo "sops-gpg-adapter 0.1";
   exit 0
 fi
 
 # ensure the secret store is unlocked
-@sane_secrets_unlock@/bin/sane-secrets-unlock
+sane-secrets-unlock
 
 # using exec here forwards our stdin
 # browserpass parses the response in
@@ -16,4 +17,4 @@ fi
 # it cares about `key:value`, and ignores whatever doesn't fit that (or has an unknown key)
 # browserpass understands the `totp` field to hold either secret tokens, or full URLs.
 # i use totp-b32 for the base-32-encoded secrets. renaming that field works OOTB.
-exec @sops@/bin/sops --input-type yaml -d --output-type yaml --config /dev/null /dev/stdin | @gnused@/bin/sed s/\^totp-b32:/totp:/
+exec sops --input-type yaml -d --output-type yaml --config /dev/null /dev/stdin | sed s/\^totp-b32:/totp:/