zsh: Try splitting zprofile by OS

etc/profile.linux

@@ -0,0 +1,33 @@
+has() {
+    command -V "$1" > /dev/null 2>&1
+}
+
+source_if() {
+    if [ -e "$1" ]; then
+        source "$1"
+    fi
+}
+
+path_if() {
+    if [ -d "$1" ]; then
+        case ":$PATH:" in
+            *:"$1":*)
+                ;;
+            *)
+                PATH="${1}${PATH:+:$PATH}"
+        esac
+    fi
+}
+
+source_if "${HOME}/.nix-profile/etc/profile.d/nix.sh"
+
+path_if "$HOME/bin"
+path_if "$HOME/.local/bin"
+
+unset -f source_if
+unset -f path_if
+
+if has gnome-keyring-daemon; then
+    eval "$(gnome-keyring-daemon --start)"
+    export SSH_AUTH_SOCK
+fi