How to ADD all files/directories except a hidden directory like .git in Dockerfile
One of things we do often is to package all source code in Dockerfile when we build a Docker image.
ADD . /app
How can we avoid including the .git directory in simple way ?
I tried the Unix way of handling this using ADD [^.]* /app/
Complete sample:
docker@boot2docker:/mnt/sda1/tmp/abc$ find . . ./c ./.git ./Dockerfile ./good ./good/a1 docker@boot2docker:/mnt/sda1/tmp/abc$ cat Dockerfile FROM ubuntu ADD [^.]* /app/ docker@boot2docker:/mnt/sda1/tmp/abc$ docker build -t abc . Sending build context to Docker daemon 4.096 kB Sending build context to Docker daemon Step 0 : FROM ubuntu ---> 04c5d3b7b065 Step 1 : ADD [^.]* /app/ d ---> 5d67603f108b Removing intermediate container 60159dee6ac8 Successfully built 5d67603f108b docker@boot2docker:/mnt/sda1/tmp/abc$ docker run -it abc root@1b1705dd66a2:/# ls -l app total 4 -rw-r--r-- 1 1000 staff 30 Jan 22 01:18 Dockerfile -rw-r--r-- 1 root root 0 Jan 22 01:03 a1 -rw-r--r-- 1 root root 0 Jan 22 00:10 c
And secondly, it will lose the directory structure, since good\a1 gets changed to a1.
Related source code in Docker is https://github.com/docker/docker/blob/eaecf741f0e00a09782d5bcf16159cc8ea258b67/builder/internals.go#L115
Solution 1:
You may exclude unwanted files with the help of the .dockerignore file
Solution 2:
How can we avoid including the .git directory in simple way ?
Just create a file called .dockerignore in the root context folder with the following lines
**/.git
**/node_modules
With such lines Docker will exclude directories .git and node_modules from any subdirectory including root. Docker also supports a special wildcard string ** that matches any number of directories (including zero).
And secondly, it will lose the directory structure, since good\a1 gets changed to a1
With .dockerignore it won't
$ docker run -it --rm sample tree /opt/
/opt/
├── Dockerfile
├── c
│ └── no_sslv2.patch
└── good
└── a1
└── README
3 directories, 3 files
Reference to official docs: .dockerignore