.dockerignore with absolute paths doesn't work

[glensc]

with given .dockerignore:

# https://docs.docker.com/engine/reference/builder/#dockerignore-file
/*
!/bootstrap.php
!/composer.*
!/src
!/vendor
!/web

you can see that docker cli procesess normally while docker-compose does not:

$ docker --version
Docker version 17.12.0-ce, build c97c6d6

$ docker build .
Sending build context to Docker daemon  18.01MB
Step 1/12 : FROM composer:1.6 AS build
 ---> 2f3f191337e9
Step 2/12 : COPY . /app
 ---> 51e70e31d7b7
Step 3/12 : WORKDIR /app
Removing intermediate container 195eb1157938
 ---> dbf19d487c8a
Step 4/12 : RUN composer install --no-dev -a
 ---> Running in 35df8ef9860a
Loading composer repositories with package information
...

$ docker-compose --version
docker-compose version 1.18.0, build 8dd22a9

$ docker-compose build
Building app
Step 1/12 : FROM composer:1.6 AS build
 ---> 2f3f191337e9
Step 2/12 : COPY . /app
 ---> Using cache
 ---> e4a4db6fbad5
Step 3/12 : WORKDIR /app
 ---> Using cache
 ---> 736fd5af09ae
Step 4/12 : RUN composer install --no-dev -a
 ---> Running in 197839d9f942
Composer could not find a composer.json file in /app
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
ERROR: Service 'app' failed to build: The command '/bin/sh -c composer install --no-dev -a' returned a non-zero code: 1

[shin-]

I'll look into it, thanks for the report.

[glensc]

thanks ahead!

[bscheshirwork]

@glensc all is ok now?

[glensc]

@bscheshirwork will wait for 1.20.0 release and report then (create new issue or reopen this) if still broken. thanks.