% cat echo.msh
#!/usr/local/bin/msh exec docker build -t {{.Name}} -f {{.Path}} {{.ContextDir}}; docker run {{.Name}} hello world
FROM alpine:3
ENTRYPOINT ["echo"]
% ./echo.msh
2020/11/23 22:31:12 Running command and waiting for it to finish...
[+] Building 0.0s (5/5) FINISHED
=> [internal] load build definition from echo.msh
=> => transferring dockerfile: 191B
=> [internal] load .dockerignore
=> => transferring context: 2B
=> [internal] load metadata for docker.io/library/alpine:3
=> CACHED [1/1] FROM docker.io/library/alpine:3
=> exporting to image
=> => exporting layers
=> => writing image sha256:595b26ac4285e518a9794f0f8287d6a3fb2df9dfeb636d11a9ca5fd8070424b4
=> => naming to docker.io/library/echo.msh
2020/11/23 22:31:12 Running command and waiting for it to finish...
hello world
The dockerfile arg is mostly doing the same thing as the shebang line in the echo example. The idea is the syntax would be closer to this example but could be written out manually as well if you needed to.
% cat cat.msh
#!/usr/local/bin/msh dockerfile
FROM alpine:3
ENTRYPOINT ["cat"]
% echo 'hello world again'| ./cat.msh
2020/11/23 22:31:43 Running command and waiting for it to finish...
[+] Building 0.0s (5/5) FINISHED
=> [internal] load build definition from cat.msh
=> => transferring dockerfile: 104B
=> [internal] load .dockerignore
=> => transferring context: 2B
=> [internal] load metadata for docker.io/library/alpine:3
=> CACHED [1/1] FROM docker.io/library/alpine:3
=> exporting to image
=> => exporting layers
=> => writing image sha256:a71009c164801bcd6572e22ca1c86da33a90dcb78c1b75c1187f74d62e0eb8a6
=> => naming to docker.io/library/cat.msh
2020/11/23 22:31:43 Running command and waiting for it to finish...
hello world again