Hey everyone I am having a problem using the native packager to create a docker image of a Scalatra web app. The relevant part of my build.sbt file is here:
enablePlugins(JettyPlugin)
enablePlugins(JavaAppPackaging)
enablePlugins(DockerPlugin)
// for Docker, the "." location where it is looking for files is in target/docker/stage. For the COPY command to work,
// the sbt Docker packager has to know this file resides in ../../scala-2.11 so include this mapping
//mappings in Docker += file("../../scala-2.11/direct2-batch-match_2.11-0.1.0-SNAPSHOT.war") -> "direct2-batch-match_2.11-0.1.0-SNAPSHOT.war"
dockerCommands := Seq(Cmd("FROM","tomcat:8.0.20-jre8"), Cmd("LABEL", """vendor="Dun & Bradstreet" """), Cmd("LABEL", """version="0.0" """), Cmd("EXPOSE", "8080"), Cmd("COPY","direct2-batch-match_2.11-0.1.0-SNAPSHOT.war","webapps/d2bm.war"))
As you can see I have commented out mappings in Docker. The reason for this is if I leave it in, it creates an empty directory in target/docker/stage with the same name as my war file (in this case direct2-batch-match_2.11-0.1.0-SNAPSHOT.war). This allows the Dockerfile to work fine for the docker build, but the contents of the war file are not included in the build.
I am running on Mac OS X, I wondered if this was a bug where the plugin was attempting to create a link to the desired file and perhaps the link command for Linux gives the wrong results on Mac OS X Sierra.
Do I need to do the mappings differently? Has anyone else run into this? The empty directory is created when I run docker:publishLocal in sbt, I am using plugin version 1.2.0-M9.
results of running docker:publishLocal in sbt:
docker:publishLocal
[info] Updating {file:/Users/cardm/projects/direct2-batch-match/}direct2-batch-match...
[info] Wrote /Users/cardm/projects/direct2-batch-match/target/scala-2.11/direct2-batch-match_2.11-0.1.0-SNAPSHOT.pom
[info] Resolving org.scalatra.scalate#scalate-precompiler_2.11;1.8.0.1 ...
[info] Done updating.
[info] Compiling Templates in Template Directory: /Users/cardm/projects/direct2-batch-match/src/main/webapp/WEB-INF/templates
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[warn] You have no main class in your project. No start script will be generated.
[warn] You have no main class in your project. No start script will be generated.
[info] Sending build context to Docker daemon 74.45 MB
[info] Step 1/5 : FROM tomcat:8.0.20-jre8
[info] ---> e88a065848be
[info] Step 2/5 : LABEL vendor "Dun & Bradstreet"
[info] ---> Using cache
[info] ---> de03acb09377
[info] Step 3/5 : LABEL version "0.0"
[info] ---> Using cache
[info] ---> f4f3e4accacb
[info] Step 4/5 : EXPOSE 8080
[info] ---> Using cache
[info] ---> f971b388dc2c
[info] Step 5/5 : COPY direct2-batch-match_2.11-0.1.0-SNAPSHOT.war webapps/d2bm.war
[info] ---> 60a95c386e23
[info] Removing intermediate container cf15079616cd
[info] Successfully built 60a95c386e23
[info] Built image DockerAlias(None,None,direct2-batch-match,Some(0.1.0-SNAPSHOT))
[success] Total time: 4 s, completed Apr 28, 2017 6:35:09 PM
contents of target/docker/stage:
Mike-Cards-MacBook-Pro:direct2-batch-match cardm$ ls -la target/docker/stage/
total 8
drwxr-xr-x 5 cardm staff 170 Apr 28 18:35 .
drwxr-xr-x 4 cardm staff 136 Apr 28 18:35 ..
-rw-r--r-- 1 cardm staff 156 Apr 28 18:35 Dockerfile
drwxr-xr-x 2 cardm staff 68 Dec 31 1969 direct2-batch-match_2.11-0.1.0-SNAPSHOT.war
drwxr-xr-x 3 cardm staff 102 Apr 28 18:35 opt
As you can see something is wrong it's useless to put an empty directory in there instead of the file, that's why I'm thinking this is supposed to be a link instead. In my set file if I use "mappings in Universal" instead it produces the same result, an empty directory with the war file's name.
