termux: drop tailscaled (cannot run in proot, SELinux netlink), export SVDIR=/etc/service in zshenv

home/termux.nix

@@ -80,6 +80,11 @@
         theme = "robbyrussell";
       };
       loginExtra = "clear && fastfetch && cd ~/.config/nix-on-droid";
+      # .zshenv — sourced by zsh in ALL sessions incl. non-login ssh commands.
+      # runit from nixpkgs defaults to /var/service as SVDIR, but our tree
+      # lives at ~/service (symlinked as /etc/service). Export it so that
+      # `sv status sshd` works without qualifying the path.
+      envExtra = "export SVDIR=/etc/service";
       initContent = ''
         beet-p() {
           local base="${config.home.homeDirectory}/.config/beets/My"
@@ -110,7 +115,7 @@
         z-proxy = "export ALL_PROXY=socks5://localhost:10808";
         zh-proxy = "export HTTPS_PROXY=http://localhost:10808 && export HTTP_PROXY=http://localhost:10808";
         nix-dir = "cd ~/.config/nix-on-droid";
-        q-ssh = "sv-start"; # start all supervised services (sshd, tailscaled, ...); manage with `sv status sshd` etc
+        q-ssh = "sv-start"; # start all supervised services (sshd, ...); manage with `sv status sshd` etc
 
         # beets
         beet-ima = "beet im ./ -A";

modules/termux/default.nix

@@ -9,20 +9,12 @@ let
   sshdTmpDir = "${config.user.home}/sshd-tmp";
   port = 8022;
   serviceDir = "${config.user.home}/service";
-  tailscaleState = "${config.user.home}/tailscale/tailscaled.state";
 
   # runit run-scripts (executable store paths, linked into ~/service).
   sshdRun = pkgs.writeScriptBin "sshd-run" ''
     #!${pkgs.runtimeShell}
     exec ${pkgs.openssh}/bin/sshd -f /etc/ssh/sshd_config -D
   '';
-  tailscaledRun = pkgs.writeScriptBin "tailscaled-run" ''
-    #!${pkgs.runtimeShell}
-    # real tun: requires /dev/net/tun access (root: su -c 'chmod 666 /dev/net/tun').
-    # If unavailable, fall back to userspace networking:
-    #   exec ${pkgs.tailscale}/bin/tailscaled --tun=userspace-networking --socks5-server=localhost:1055 --state=${tailscaleState}
-    exec ${pkgs.tailscale}/bin/tailscaled --state=${tailscaleState}
-  '';
   svLogRun = pkgs.writeScriptBin "sv-log-run" ''
     #!${pkgs.runtimeShell}
     mkdir -p ./main
@@ -60,20 +52,21 @@ in
   # runit service tree: ~/service/<name>/{run,log/run}. run/ and log/run are
   # symlinks into the nix store (read-only is fine; runsvdir writes only to
   # the <name>/supervise dirs). /etc/service is symlinked for `sv status`.
+  # NOTE: tailscaled was removed — nixpkgs' linux build cannot run inside
+  # proot (SELinux blocks netlink; needs GOOS=android or root). Re-add only
+  # if that gets solved.
   build.activation.services = ''
-    $DRY_RUN_CMD mkdir -p ${serviceDir}/sshd/log ${serviceDir}/tailscaled/log
+    $DRY_RUN_CMD rm -rf ${serviceDir}/tailscaled
+    $DRY_RUN_CMD mkdir -p ${serviceDir}/sshd/log
     $DRY_RUN_CMD ln -sfn ${sshdRun}/bin/sshd-run ${serviceDir}/sshd/run
     $DRY_RUN_CMD ln -sfn ${svLogRun}/bin/sv-log-run ${serviceDir}/sshd/log/run
-    $DRY_RUN_CMD ln -sfn ${tailscaledRun}/bin/tailscaled-run ${serviceDir}/tailscaled/run
-    $DRY_RUN_CMD ln -sfn ${svLogRun}/bin/sv-log-run ${serviceDir}/tailscaled/log/run
     $DRY_RUN_CMD ln -sfn ${serviceDir} /etc/service
   '';
 
   environment.packages = [
     pkgs.runit
-    pkgs.tailscale
 
-    # one command brings up all supervised services (sshd, tailscaled, ...)
+    # one command brings up all supervised services (sshd, ...)
     svStart
 
     # manual fallback for sshd only