Run chmod +x explicitly in stage0

src/main/scala/com/typesafe/sbt/packager/docker/DockerPermissionStrategy.scala

@@ -45,6 +45,13 @@ sealed trait DockerChmodType {
 }
 object DockerChmodType {
 
+  /**
+    * Gives read permission to users and groups.
+    */
+  case object UserGroupRead extends DockerChmodType {
+    def argument: String = "u=r,g=r"
+  }
+
   /**
     * Gives read permission to users and groups.
     * Gives execute permission to users and groups, if +x flag is on for any.
@@ -61,6 +68,13 @@ object DockerChmodType {
     def argument: String = "u=rwX,g=rwX"
   }
 
+  /**
+    * Gives +x permission to users and groups.
+    */
+  case object UserGroupPlusExecute extends DockerChmodType {
+    def argument: String = "u+x,g+x"
+  }
+
   /**
     * Copies user file mode bits to group file mode bits.
     */

src/main/scala/com/typesafe/sbt/packager/docker/DockerPlugin.scala

@@ -108,6 +108,16 @@ object DockerPlugin extends AutoPlugin {
     },
     dockerRmiCommand := dockerExecCommand.value ++ Seq("rmi"),
     dockerBuildCommand := dockerExecCommand.value ++ Seq("build") ++ dockerBuildOptions.value ++ Seq("."),
+    dockerAdditionalPermissions := {
+      val scripts = makeBashScripts.value
+      val ms = (mappings in Docker).value
+      scripts flatMap {
+        case (script, _) =>
+          ms collect {
+            case (k, v) if k == script => DockerChmodType.UserGroupPlusExecute -> v
+          }
+      }
+    },
     dockerCommands := {
       val strategy = dockerPermissionStrategy.value
       val dockerBaseDirectory = (defaultLinuxInstallLocation in Docker).value
@@ -116,6 +126,7 @@ object DockerPlugin extends AutoPlugin {
       val group = (daemonGroup in Docker).value
       val gidOpt = (daemonGroupGid in Docker).value
       val base = dockerBaseImage.value
+      val addPerms = dockerAdditionalPermissions.value
 
       val generalCommands = makeFrom(base) +: makeMaintainer((maintainer in Docker).value).toSeq
       val stage0name = "stage0"
@@ -126,9 +137,10 @@ object DockerPlugin extends AutoPlugin {
             makeWorkdir(dockerBaseDirectory),
             makeCopy(dockerBaseDirectory),
             makeUser("root"),
-            makeChmod(dockerChmodType.value, Seq(dockerBaseDirectory)),
-            DockerStageBreak
-          )
+            makeChmodRecursive(dockerChmodType.value, Seq(dockerBaseDirectory))
+          ) ++
+            (addPerms map { case (tpe, v) => makeChmod(tpe, Seq(v)) }) ++
+            Seq(DockerStageBreak)
         case _ => Seq()
       }
 
@@ -142,7 +154,8 @@ object DockerPlugin extends AutoPlugin {
           case DockerPermissionStrategy.MultiStage =>
             Seq(makeCopyFrom(dockerBaseDirectory, stage0name, user, group))
           case DockerPermissionStrategy.Run =>
-            Seq(makeCopy(dockerBaseDirectory), makeChmod(dockerChmodType.value, Seq(dockerBaseDirectory)))
+            Seq(makeCopy(dockerBaseDirectory), makeChmodRecursive(dockerChmodType.value, Seq(dockerBaseDirectory))) ++
+              (addPerms map { case (tpe, v) => makeChmod(tpe, Seq(v)) })
           case DockerPermissionStrategy.CopyChown =>
             Seq(makeCopyChown(dockerBaseDirectory, user, group))
           case DockerPermissionStrategy.None =>
@@ -156,6 +169,8 @@ object DockerPlugin extends AutoPlugin {
           case Some(uid) => makeUser(uid)
           case _         => makeUser(user)
         }) ++
+        // Use this to debug permissions
+        // Seq(ExecCmd("RUN", Seq("ls", "-l", "/opt/docker/bin/"): _*)) ++
         Seq(makeEntrypoint(dockerEntrypoint.value), makeCmd(dockerCmd.value))
 
       stage0 ++ stage1
@@ -321,9 +336,15 @@ object DockerPlugin extends AutoPlugin {
     ExecCmd("RUN", Seq("chown", "-R", s"$daemonUser:$daemonGroup") ++ directories: _*)
 
   /**
-    * @return chown command, owning the installation directory with the daemonuser
+    * @return chmod command
+    */
+  private final def makeChmod(chmodType: DockerChmodType, files: Seq[String]): CmdLike =
+    ExecCmd("RUN", Seq("chmod", chmodType.argument) ++ files: _*)
+
+  /**
+    * @return chmod command recursively
     */
-  private final def makeChmod(chmodType: DockerChmodType, directories: Seq[String]): CmdLike =
+  private final def makeChmodRecursive(chmodType: DockerChmodType, directories: Seq[String]): CmdLike =
     ExecCmd("RUN", Seq("chmod", "-R", chmodType.argument) ++ directories: _*)
 
   /**

src/main/scala/com/typesafe/sbt/packager/docker/Keys.scala

@@ -49,4 +49,6 @@ trait DockerKeys {
 private[packager] trait DockerKeysEx extends DockerKeys {
   lazy val dockerPermissionStrategy = settingKey[DockerPermissionStrategy]("The strategy to change file permissions.")
   lazy val dockerChmodType = settingKey[DockerChmodType]("The file permissions for the files copied into Docker image.")
+  lazy val dockerAdditionalPermissions =
+    taskKey[Seq[(DockerChmodType, String)]]("Explicit chmod calls to some of the paths.")
 }

src/sbt-test/docker/file-permission/Main.scala

@@ -0,0 +1,5 @@
+package example
+
+object Main extends App {
+  println("hello")
+}

src/sbt-test/docker/file-permission/build.sbt

@@ -18,6 +18,7 @@ lazy val root = (project in file("."))
           |COPY opt /opt
           |USER root
           |RUN ["chmod", "-R", "u=rX,g=rX", "/opt/docker"]
+          |RUN ["chmod", "u+x,g+x", "/opt/docker/bin/file-permission-test"]
           |
           |FROM fabric8/java-centos-openjdk8-jdk
           |USER root
@@ -53,6 +54,7 @@ lazy val root = (project in file("."))
           |WORKDIR /opt/docker
           |COPY opt /opt
           |RUN ["chmod", "-R", "u=rX,g=rX", "/opt/docker"]
+          |RUN ["chmod", "u+x,g+x", "/opt/docker/bin/file-permission-test"]
           |USER 1001
           |ENTRYPOINT ["/opt/docker/bin/file-permission-test"]
           |CMD []""".stripMargin.linesIterator.toList)
@@ -79,6 +81,7 @@ lazy val root = (project in file("."))
           |COPY opt /opt
           |USER root
           |RUN ["chmod", "-R", "u=rwX,g=rwX", "/opt/docker"]
+          |RUN ["chmod", "u+x,g+x", "/opt/docker/bin/file-permission-test"]
           |
           |FROM fabric8/java-centos-openjdk8-jdk
           |USER root

src/sphinx/formats/docker.rst

@@ -128,11 +128,16 @@ Environment Settings
   ``dockerChmodType``
     The file permissions for the files copied into Docker image when ``MultiStage`` or ``Run`` strategy is used.
 
-    * ``DockerChmodType.UserGroupReadExecute`` (default): chmod -R u=rX,g=rX
-    * ``DockerChmodType.UserGroupWriteExecute``: chmod -R u=rwX,g=rwX
-    * ``DockerChmodType.SyncGroupToUser``: chmod -R g=u
+    * ``DockerChmodType.UserGroupReadExecute`` (default): chmod u=rX,g=rX
+    * ``DockerChmodType.UserGroupRead``: chmod u=r,g=r
+    * ``DockerChmodType.UserGroupWriteExecute``: chmod u=rwX,g=rwX
+    * ``DockerChmodType.SyncGroupToUser``: chmod g=u
+    * ``DockerChmodType.UserGroupPlusExecute``: chmod u+x,g+x (This is for ``dockerAdditionalPermissions``)
     * ``DockerChmodType.Custom``: Custom argument provided by the user.
 
+  ``dockerAdditionalPermissions``
+    Additional permissions typically used to give ``chmod +x`` rights for the executable files. By default generated Bash scripts are given ``DockerChmodType.UserGroupPlusExecute``.
+
   ``dockerVersion``
     The docker server version. Used to leverage new docker features while maintaining backwards compatibility.
 
@@ -271,6 +276,14 @@ If you want to make the working directory writable by the running process, here'
 
     dockerChmodType := DockerChmodType.UserGroupWriteExecute
 
+By default, the shell scripts generated by SBT Native Packager are given ``chmod +x`` rights. Here's the setting to do so for other files:
+
+.. code-block:: scala
+
+    import com.typesafe.sbt.packager.docker.DockerChmodType
+
+    dockerAdditionalPermissions += (DockerChmodType.UserGroupPlusExecute, "/opt/docker/bin/hello")
+
 If you don't want SBT Native Packager to change the file permissions at all here's a strategy you can choose:
 
 .. code-block:: scala
@@ -280,7 +293,7 @@ If you don't want SBT Native Packager to change the file permissions at all here
     dockerPermissionStrategy := DockerPermissionStrategy.None
 
 This will inherit the file mode bits set in your machine. Given that Kubernetes implementations like OpenShift will use an arbitrary user,
-remember to set both the user bits and group bits when running `chmod` yourself.
+remember to set both the user bits and group bits when running ``chmod`` yourself.
 
 Custom Dockerfile
 ~~~~~~~~~~~~~~~~~