diff --git a/deps.edn b/deps.edn
index 9616393..1432947 100644
--- a/deps.edn
+++ b/deps.edn
@@ -1,6 +1,7 @@
 {:paths ["src" "resources"]
  :deps {org.clojure/clojure {:mvn/version "RELEASE"}
         com.cemerick/pomegranate {:mvn/version "RELEASE"}
+        s3-wagon-private/s3-wagon-private {:mvn/version "1.3.1"}
         org.clojure/data.xml {:mvn/version "0.2.0-alpha5"}
         org.slf4j/slf4j-nop {:mvn/version "RELEASE"}}
  :aliases
@@ -14,7 +15,17 @@
                "-d" "test"]}
   :depstar {:extra-deps
             {seancorfield/depstar {:mvn/version "1.1.117"}}}
-  :deploy {:main-opts ["-m" "deps-deploy.deps-deploy" "deploy"
-                       "deps-deploy.jar" true]}
-  :install {:main-opts ["-m" "deps-deploy.deps-deploy" "install"
-                        "deps-deploy.jar"]}}}
+
+  :deploy {:exec-fn deps-deploy.deps-deploy/deploy
+           :exec-args {:installer :remote
+                       :sign-releases? true
+                       :artifact "deps-deploy.jar"
+
+                       :repository {"clojars" {:url "https://clojars.org/repo"
+                                               :username "your-username"
+                                               :password "CLOJARS_your-deploy-token"}}}}
+
+  :install {:exec-fn deps-deploy.deps-deploy/deploy
+            :exec-args {:installer :local
+                        :artifact "deps-deploy.jar"}
+            }}}
diff --git a/src/deps_deploy/deps_deploy.clj b/src/deps_deploy/deps_deploy.clj
index 6180711..d30b314 100644
--- a/src/deps_deploy/deps_deploy.clj
+++ b/src/deps_deploy/deps_deploy.clj
@@ -6,6 +6,11 @@
             [clojure.java.io :as io]
             [clojure.data.xml :as xml]))
 
+
+(aether/register-wagon-factory! "s3p" #(org.springframework.build.aws.maven.PrivateS3Wagon.))
+(aether/register-wagon-factory! "s3" #(org.springframework.build.aws.maven.SimpleStorageServiceWagon.))
+
+
 (def default-repo-settings {"clojars" {:url (or (System/getenv "CLOJARS_URL") "https://clojars.org/repo")
                                        :username (System/getenv "CLOJARS_USERNAME")
                                        :password (System/getenv "CLOJARS_PASSWORD")}})
@@ -75,9 +80,9 @@
 (defn- artifact [{:keys [group-id artifact-id version]}]
   (str group-id "/" artifact-id "-" version))
 
-(defmulti deploy :installer)
+(defmulti deploy* :installer)
 
-(defmethod deploy :clojars [{:keys [artifact-map coordinates repository]
+(defmethod deploy* :remote [{:keys [artifact-map coordinates repository]
                              :or {repository default-repo-settings} :as opts}]
   (println "Deploying" (artifact coordinates) "to clojars as"
            (-> repository vals first :username))
@@ -88,22 +93,81 @@
                  :coordinates (mvn-coordinates coordinates))
   (println "done."))
 
-(defmethod deploy :local [{:keys [artifact-map coordinates]}]
+(defmethod deploy* :local [{:keys [artifact-map coordinates]}]
   (println "Installing" (artifact coordinates) "to your local `.m2`")
   (aether/install :artifact-map artifact-map
                   :transfer-listener :stdout
                   :coordinates (mvn-coordinates coordinates))
   (println "done."))
 
-(defn -main [deploy-or-install artifact & [sign-releases]]
-  (let [pom (slurp "pom.xml")
-        coordinates (coordinates-from-pom pom)
-        versioned-pom (spit (versioned-pom-filename coordinates) pom)]
-
+(defn- tag-val-replacer [tag->val]
+  (fn [{:keys [tag content attrs] :as el}]
+    (let [replacement-val (tag->val tag ::default)]
+      (if (= ::default replacement-val)
+        el
+        (assoc el :content replacement-val)))))
+
+(defn update-pom [{:keys [pom-file
+                          mvn/version
+                          mvn/group-id
+                          mvn/artifact-id] :as opts}]
+  (-> (or pom-file "pom.xml")
+      io/reader
+      xml/parse
+      (update :content
+                 #(map (tag-val-replacer {version-tag [version]
+                                          group-id-tag [group-id]
+                                          artifact-id-tag [artifact-id]}) %))
+      xml/emit-str))
+
+(defn deploy
+  "The main entry point into deps-deploy via tools.deps :exec-fn which
+  supports an opts map that can be supplied via :exec-args.
+
+  Required keys are:
+
+  :artifact   A string specifying the file path relative to the current
+              working directory to the artifact to be deployed.  This will
+              normally be your library packaged as a jar.
+
+  :installer  Set to either :local or :remote depending on whether you
+              want to install into your local .m2 cache or to a remote
+              :repository.
+
+  :pom-file   defaults to \"pom.xml\"
+
+  :sign-releases?  A boolean that specifies whether releases should be
+                   signed
+
+  "
+  [{:keys [sign-releases? artifact] :as opts}]
+  (let [updated-pom (update-pom opts)
+        coordinates (coordinates-from-pom updated-pom)
+        updated-pom-file-name (versioned-pom-filename coordinates)]
+    (spit updated-pom-file-name updated-pom)
     (try
-      (deploy {:installer (cond (= "deploy" deploy-or-install) :clojars
-                                (= "install" deploy-or-install) :local)
-               :artifact-map (all-artifacts sign-releases coordinates artifact)
-               :coordinates coordinates})
+      (deploy*
+       (assoc opts
+              :artifact-map (all-artifacts sign-releases? coordinates artifact)
+              :coordinates coordinates))
       (finally
-        (.delete (java.io.File. (versioned-pom-filename coordinates)))))))
+        (.delete (java.io.File. updated-pom-file-name))))))
+
+;; command line mode
+(defn -main [deploy-or-install artifact & [sign-releases]]
+  (deploy {:installer (cond (= "deploy" deploy-or-install) :remote
+                            (= "install" deploy-or-install) :local)
+           :sign-releases? (= "true" sign-releases)
+           :artifact artifact}))
+
+(comment
+
+  (deploy {:installer :remote
+           :artifact "deps-deploy.jar"
+           :pom-file "pom.xml"
+           :mvn/version "999"
+           :repository {"clojars" {:url "https://clojars.org/repo"
+                                   :username "clojars-username"
+                                   :password "CLOJARS-token"}}})
+
+  )