Resources defined through mappings not copied into Docker

I am trying to package a scala server app into a Docker

Expected behaviour

I am suppose to get my application and a directory with some resources in the docker image.

Actual behaviour

Only application in /opt/docker/bin and dependency jars in opt/docker/lib are copied. The resources defined through the mappings mechanism are not copied.

Information

I use:

• sbt-native-packager 1.7.3
• sbt 1.3.10
• OS: Ubuntu 20.04
• packaging java application into a docker
• My piece of code:

lazy val application = project.in(file("application")) settings (defaultSettings) dependsOn (server) enablePlugins (JavaServerAppPackaging) settings(
  mappings in Universal ++= {
    val prefix = "target/webapp"
    Seq(
      (dependencyFile in client in Compile).value -> s"$prefix/js/connect-deps.js",
      (fullOptJS in client in Compile).value.data -> s"$prefix/js/connect.js"
    ) ++ doMapping((resourceDirectory in client in Compile).value, "target") ++ doMapping((cssFile in client in Compile).value, s"$prefix/css/")
  },
  dockerEntrypoint in Universal := Seq("/opt/docker/bin/application"),
  packageName in Universal := "openmole-connect",
  organization in Universal := "openmole",
  dockerBuildOptions += "--no-cache"
)

Note: the doMapping function fetch recursively all the resources contained in directories.

Note that my target/webapp directory seems to be properly copied in target/docker/stage/opt/docker/target/webapp but not in the docker itself.

The generated Docker instructions look like this:

[info] Sending build context to Docker daemon   72.6MB
[info] Step 1/22 : FROM openjdk:8 as stage0
[info]  ---> b190ad78b520
[info] Step 2/22 : LABEL snp-multi-stage="intermediate"
[info]  ---> Running in 9c6969995766
[info] Removing intermediate container 9c6969995766
[info]  ---> 64d07a530801
[info] Step 3/22 : LABEL snp-multi-stage-id="2c8d683f-dad5-4bc2-ab11-a6f66f96bb8a"
[info]  ---> Running in 27c629362891
[info] Removing intermediate container 27c629362891
[info]  ---> c004389b95c2
[info] Step 4/22 : WORKDIR /opt/docker
[info]  ---> Running in 9c7cd81b0f42
[info] Removing intermediate container 9c7cd81b0f42
[info]  ---> 4efac068a359
[info] Step 5/22 : COPY opt /opt
[info]  ---> 32c400dc8ff5
[info] Step 6/22 : COPY 1/opt /1/opt
[info]  ---> 6b12f0c7b56d
[info] Step 7/22 : COPY 2/opt /2/opt
[info]  ---> e6ec4c732ee5
[info] Step 8/22 : USER root
[info]  ---> Running in 675f87e3b9de
[info] Removing intermediate container 675f87e3b9de
[info]  ---> fa474725d20e
[info] Step 9/22 : RUN ["chmod", "-R", "u=rX,g=rX", "/opt/docker"]
[info]  ---> Running in 7c8acb6e2212
[info] Removing intermediate container 7c8acb6e2212
[info]  ---> 7c401cea0e70
[info] Step 10/22 : RUN ["chmod", "-R", "u=rX,g=rX", "/1/opt/docker"]
[info]  ---> Running in 06214e76114c
[info] Removing intermediate container 06214e76114c
[info]  ---> 9f56b46dec14
[info] Step 11/22 : RUN ["chmod", "-R", "u=rX,g=rX", "/2/opt/docker"]
[info]  ---> Running in d7126964057a
[info] Removing intermediate container d7126964057a
[info]  ---> 3da3628e2d99
[info] Step 12/22 : RUN ["chmod", "u+x,g+x", "/1/opt/docker/bin/application"]
[info]  ---> Running in fe5c10827ff6
[info] Removing intermediate container fe5c10827ff6
[info]  ---> 180fff21da6a
[info] Step 13/22 : FROM openjdk:8 as mainstage
[info]  ---> b190ad78b520
[info] Step 14/22 : USER root
[info]  ---> Running in 3cd3a06042d6
[info] Removing intermediate container 3cd3a06042d6
[info]  ---> 96de0ebdbe78
[info] Step 15/22 : RUN id -u demiourgos728 1>/dev/null 2>&1 || (( getent group 0 1>/dev/null 2>&1 || ( type groupadd 1>/dev/null 2>&1 && groupadd -g 0 root || addgroup -g 0 -S root )) && ( type useradd 1>/dev/null 2>&1 && useradd --system --create-home --uid 1001 --gid 0 demiourgos728 || adduser -S -u 1001 -G root demiourgos728 ))
[info]  ---> Running in 15a57b0eb978
[info] Removing intermediate container 15a57b0eb978
[info]  ---> 59a0dd3dc380
[info] Step 16/22 : WORKDIR /opt/docker
[info]  ---> Running in ddc5b63af17d
[info] Removing intermediate container ddc5b63af17d
[info]  ---> cd44f5ba5400
[info] Step 17/22 : COPY --from=stage0 --chown=demiourgos728:root /opt/docker /opt/docker
[info]  ---> 5e256b40af0e
[info] Step 18/22 : COPY --from=stage0 --chown=demiourgos728:root /1/opt/docker /opt/docker
[info]  ---> abb06e4be250
[info] Step 19/22 : COPY --from=stage0 --chown=demiourgos728:root /2/opt/docker /opt/docker
[info]  ---> 915afa5d368b
[info] Step 20/22 : USER 1001:0
[info]  ---> Running in db401963a3af
[info] Removing intermediate container db401963a3af
[info]  ---> 7823f2903569
[info] Step 21/22 : ENTRYPOINT ["/opt/docker/bin/application"]
[info]  ---> Running in ef833e26ac04
[info] Removing intermediate container ef833e26ac04
[info]  ---> 0a1e5cb53cde
[info] Step 22/22 : CMD []
[info]  ---> Running in 9eabe2698166
[info] Removing intermediate container 9eabe2698166
[info]  ---> 8a445e1cc20a
[info] Successfully built 8a445e1cc20a
[info] Successfully tagged application:0.1.0-SNAPSHOT
[info] Removing intermediate image(s) (labeled "snp-multi-stage-id=2c8d683f-dad5-4bc2-ab11-a6f66f96bb8a") 
[info] Deleted Images:
[info] deleted: sha256:180fff21da6af8d2da62373582006795770fe7ecea60b8256b7d7aa8463116c4
[info] deleted: sha256:f04603065a55aa78ace281a1af9d05e67a01a5b065c9869519805c3d3f4a5a2f
[info] deleted: sha256:3da3628e2d99ad32198bc6c679e78874ebebe84a3c1457fb1ef756b01002aa5e
[info] deleted: sha256:0a886f2e99dc51acfd17748939c9c2252e9ffe87c89e58e7cf6b868487ace60f
[info] deleted: sha256:9f56b46dec141e1210c0600e82ba1d3de1d564c2db1f0d01efac1c16d1847629
[info] deleted: sha256:e706f8706b81debe373c4e3f916bd8e97c299c9dc8487c164ef4f0b6c55af273
[info] deleted: sha256:7c401cea0e70d1a9fc2ffe9bfdb7c7ae937c47a1c648fdf38cf36b0891901fec
[info] deleted: sha256:f62020e6a514c2252f62d72956d899d18079a7377123681c4b75140d037dd1a9
[info] deleted: sha256:fa474725d20e82fbbcc726e9c67959735458f0ce7f7f2ca1894221a3b92dd649
[info] deleted: sha256:e6ec4c732ee59d5ba533636e35796564f8b5c96c0afff4a901d1a1369d74e29d
[info] deleted: sha256:a6217b39b6cdd15da3748592eb3f18a7e09778aa30cec6414fa505777972e4ee
[info] deleted: sha256:6b12f0c7b56dab95c491248ee7eeaaea58ced77e95f82d9ff5e8da6f47ae6e1b
[info] deleted: sha256:ad538d8f4a615b3c23c739f6a85d7060b2e427140d527e7576babed438932b3f
[info] deleted: sha256:32c400dc8ff5610ce1f86701ac7ddd8dfa38cc2718b781c86546aa9046bac9d2
[info] deleted: sha256:c1997359f4a8986c682a6173874b5bc98fb34b1215d3ce8473c18c4661dd8980
[info] deleted: sha256:4efac068a3596186b42f1fadec54bc920153eec51a0b0979eeab988cd1e56f28
[info] deleted: sha256:d772f376cfba48e0abc58958af608d4d7ac98f622d7be0257f49e9da94528670
[info] deleted: sha256:c004389b95c29dfefd89724448b09f77dcaa49f6da46bf0a5532ffec06613d98
[info] deleted: sha256:64d07a53080185958202592ebfd2384e80420b1b4b19ed04de6370aedcbc8e32

[muuki88]

Thanks for sharing. This is strange. The mappings in Docker should inherit from mappings in Universal.

The docker plugin is quite complex due to the nature of docker being complex. I’ll leave this open as there’s something weird going on, but I don’t have the time to look deeper into it 😢

[mathieuleclaire]

Well, I fixed my problem. But I am not very sure how (and I do not like this !) I essentially changed in Universal in in Docker, but it was my very initial config, which did not work. Thanks anyway !

Here is the working snippet for memory:

val prefix = "/opt/docker/application/target"
lazy val application = project.in(file("application")) settings (defaultSettings) dependsOn(server) enablePlugins (JavaServerAppPackaging) settings(
  mappings in Docker ++= Seq(
    (dependencyFile in client in Compile).value -> s"$prefix/webapp/js/connect-deps.js",
    (fullOptJS in client in Compile).value.data -> s"$prefix/webapp/js/connect.js"
  ) ++ doMapping((resourceDirectory in client in Compile).value, prefix)
    ++ doMapping((cssFile in client in target).value, s"$prefix/webapp/css/"),
  packageName in Docker := "openmole-connect",
  organization in Docker := "openmole"
)