# How-to push/copy app folder contents in builder container **URL:** \ **Category:** Product support\ **Tags:** dockerfile\ **Created:** [April 15, 2018, 6:28pm UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930 "2018-04-15T18:28:54Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![bas\_thingshub](https://avatars.discourse-cdn.com/v4/letter/b/ac8455/32.png) [@bas\_thingshub](https://forums.balena.io/u/bas_thingshub)\ **Post date:** [April 15, 2018, 6:28pm UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930/1 "2018-04-15T18:28:54Z")
When building my golang app ([https://github.com/Bas-ProRail/resin-datacollector-edge](https://github.com/Bas-ProRail/resin-datacollector-edge)) with gradle there is an error, " ./gradlew: not found". [datacollector] Step 1/6 : FROM resin/iot2000-golang:latest [datacollector] —\> 07d5f0804451 [datacollector] Step 2/6 : ENV INITSYSTEM on [datacollector] Using cache [datacollector] —\> f9a3449b44ea [datacollector] Step 3/6 : COPY . $GOPATH/src/github.com/streamsets [datacollector] —\> a0d18d65f287 [datacollector] Removing intermediate container 9cb7c4995b47 [datacollector] Step 4/6 : RUN cd $GOPATH/src/github.com/streamsets [datacollector] —\> Running in 5bf4700a4860 [datacollector] —\> f4e869f2669c [datacollector] Removing intermediate container 5bf4700a4860 [datacollector] Step 5/6 : RUN ./gradlew build [datacollector] —\> Running in 8552d193a253 [datacollector] /bin/sh: 1: ./gradlew: not found [datacollector] [datacollector] Removing intermediate container 8552d193a253 [datacollector] The command ‘/bin/sh -c ./gradlew build’ returned a non-zero code: 127 Is there a way to check if the COPY command did copy something in $GOPATH/src/github.com/streamsets? It should copy all contents of /resin-datacollector-edge/datacollector-edge in $GOPATH/src/github.com/streamsets. Thank you for your help, Bas ---
**Author:** ![nazrhom](https://avatars.discourse-cdn.com/v4/letter/n/ee59a6/32.png) [@nazrhom](https://forums.balena.io/u/nazrhom)\ **Post date:** [April 24, 2018, 11:20am UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930/4 "2018-04-24T11:20:10Z")
Hello Bas, sorry for the late reply. I had a look at the repo you linked and it seems like the `Dockerfile` you refer to has changed. Did you manage to solve the issue? ---
**Author:** ![imrehg](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/imrehg/32/36_2.png) [@imrehg](https://forums.balena.io/u/imrehg)\ **Post date:** [April 24, 2018, 12:02pm UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930/5 "2018-04-24T12:02:21Z")
> [@bas\_thingshub](#): > > Is there a way to check if the COPY command did copy something in $GOPATH/src/github.com/streamsets For testing purposes, you could add a `RUN` line after the command in question to display the contents of the folder: ```auto COPY . $GOPATH/src/github.com/streamsets RUN ls -la $GOPATH/src/github.com/streamsets ``` On the other hand, the actual issue is not that, but that you are breaking up your `RUN` command into two lines. The things to keep in mind: - `WORKDIR` sets where you are in the container by default (can be changed as many times as you want to - Every `RUN` starts at `WORKDIR` every time Thus you `RUN cd ...`, but then the next `RUN` won’t be in that folder. In this case there are two ways to work around this: ```auto FROM resin/iot2000-golang:latest ENV INITSYSTEM on WORKDIR $GOPATH/src/github.com/streamsets COPY . . RUN ./gradlew build .... ``` and for example set `WORKDIR` later where it is more appropriate. Or, you can run multiple commands in a single `RUN`, like this: ```auto FROM resin/iot2000-golang:latest ENV INITSYSTEM on COPY . $GOPATH/src/github.com/streamsets RUN cd $GOPATH/src/github.com/streamsets && \ ./gradlew build ... ``` Here `&&` says that if the command before that succeeds, the next one will commence. `\` is just a line-break separator, that “the next line is still the same command, so continue”. Thus these two are eqivalent: ```auto RUN command1 && \ command2 && \ command3 && \ command4 ``` and ```auto RUN command1 && command2 && command3 && command4 ``` See more info in the Dockerfile reference for the [`RUN` command](https://docs.docker.com/engine/reference/builder/#run), [`COPY` command](https://docs.docker.com/engine/reference/builder/#copy), and [`WORKDIR` command](https://docs.docker.com/engine/reference/builder/#workdir). Let us know if this helps! ---
**Author:** ![bas\_thingshub](https://avatars.discourse-cdn.com/v4/letter/b/ac8455/32.png) [@bas\_thingshub](https://forums.balena.io/u/bas_thingshub)\ **Post date:** [April 26, 2018, 7:40am UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930/6 "2018-04-26T07:40:52Z")
> [@imrehg](#): > > Let us know if this helps! Thank you for assisting in this, with your commends I did a big cleanup on my dockerfile.template in [GitHub - Bas-ProRail/resin-datacollector-edge: Monitoring Siemens S7 PLCs](https://github.com/Bas-ProRail/resin-datacollector-edge) /datacollector-edge/ app my build with gradle is going great and with some altering in the [streamsets.com](http://streamsets.com) package I end up with a successfull build and a unicorn! Is there a way to reduce the size of the images the device has to download from the resin buildservers? Can I remove some unnecessary files before issuing the last CMD? ``` [Success] Release successfully created! [Info] ┌───────────────┬────────────┬───────────────────────┐ [Info] │ Service │ Image Size │ Build Time │ [Info] ├───────────────┼────────────┼───────────────────────┤ [Info] │ s7comm │ 161.84 MB │ < 1 second │ [Info] ├───────────────┼────────────┼───────────────────────┤ [Info] │ datacollector │ 920.80 MB │ 3 minutes, 12 seconds │ [Info] └───────────────┴────────────┴───────────────────────┘ [Info] Build finished in 4 minutes, 7 seconds ``` ---
**Author:** ![mccollam](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/mccollam/32/88_2.png) [@mccollam](https://forums.balena.io/u/mccollam)\ **Post date:** [April 27, 2018, 9:23pm UTC](https://forums.balena.io/t/how-to-push-copy-app-folder-contents-in-builder-container/2930/7 "2018-04-27T21:23:11Z")
Great, we’re glad to hear that things are working 🙂 You have a couple of options that you can use to reduce the download size. One is just like you said – you can remove any unnecessary files (just `RUN rm ` in your Dockerfile) at the end of your Dockerfile, before the `CMD` statement. That will shrink your image down some. Another thing you can do is turn on the [delta](https://docs.resin.io/learn/deploy/delta/) feature. This will cause your device to download only the changes between updates rather than the full image every time. The first download will still take the same amount of time/data, but future downloads will be far faster and smaller. The best news is that you can use both of these together to help shrink your download time and size!