How to copy executable file to Docker container using Testcontainers

Question

I'm trying to copy an executable initialization bash script init.sh to the Localstack Docker container created with Testcontainers (1.13.0) using the JUnit 5 module:

@Container
static LocalStackContainer localStack = new LocalStackContainer("0.10.0")
  .withServices(S3)
  .withCopyFileToContainer(MountableFile.forClasspathResource("init.sh"), "/docker-entrypoint-initaws.d/init.sh");

But inside the created Docker container the file lacks the execute permission (checked with looking at the file permission using docker exec -it ID /bin/sh).

On my machine the file has the following permission:

$ ls -al
total 16
drwxr-xr-x  4 xyz  staff  128 Apr 16 20:51 .
drwxr-xr-x  4 xyz  staff  128 Apr 16 08:43 ..
-rw-r--r--  1 xyz  staff  135 Apr 16 20:14 application.yml
-rwxr-xr-x  1 xyz  staff  121 Apr 16 20:51 init.sh

I also tried copying this file with .withClasspathResourceMapping() but this takes a binding mode which only offers READ_ONLY or READ_WRITE.

score 7 · Accepted Answer · answered Jun 23 '20 at 15:26

You can use another builder of MountableFile class, which takes the mode argument with a posix file mode value to change permission. For example, making the script executable only for the owner:

...
.withCopyFileToContainer(MountableFile.forClasspathResource("init.sh", 0744), "/docker-entrypoint-initaws.d/init.sh");

0744 is an octal file mode literal which corresponds to -rwxr--r-- permission.

However I tried the same configuration with Localstack 0.10.8 and initialisation works without even making the script executable.

How to copy executable file to Docker container using Testcontainers

1 Answers1