This repo investigates volume loading in docker compose
Different testfile* files are in the subdir and its subfolders. They are tried to loaded without a further path
to check if docker compose on some systems will find them based on the location of the compose.yaml or
even based on the build context.
Run docker compose up --build.
[+] Building 0.1s (6/6) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 68B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/alpine:latest 0.0s
=> [1/2] FROM docker.io/library/alpine 0.0s
=> CACHED [2/2] RUN apk add stress-ng 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:347e68203982afc464739d7c690b359b8498135211d40a0c379175497bd8b2c0 0.0s
=> => naming to docker.io/library/volume_bind_mount_rel_to_context 0.0s
[+] Running 1/1
✔ Container test-container Recreated 0.1s
Attaching to test-container
test-container | total 24K
test-container | drwxrwxrwt 1 root root 4.0K Jun 30 22:36 .
test-container | drwxr-xr-x 1 root root 4.0K Jun 30 22:36 ..
test-container | -rw-r--r-- 1 root root 641 Jun 30 22:36 compose.yml-correctly-mounted
test-container | -rw-r--r-- 1 root root 16 Jun 30 22:07 testfile-correctly-mounted
test-container | drwxr-xr-x 2 root root 64 Jun 30 22:36 testfile-wrongly-mounted-as-dir
test-container | -rw-r--r-- 1 root root 17 Jun 30 22:07 testfile2-correctly-mounted
test-container | drwxr-xr-x 2 root root 64 Jun 30 22:36 testfile2-wrongly-mounted-as-dir
test-container | -rw-r--r-- 1 root root 18 Jun 30 22:07 testfile3-correctly-mounted
test-container | drwxr-xr-x 2 root root 64 Jun 30 22:36 testfile3-wrongly-mounted-as-dir
test-container exited with code 0
You will then see a listing of the file system that shows that all the files that are loaded without setting the
path relative to the compose.yaml will be falsely mounted as empty directories.
Furthermore docker will create empty directories on your host system.
$ ls -alh
total 16
drwxr-xr-x@ 6 arne staff - 192B Jul 1 00:38 ./
drwxr-xr-x 31 arne staff - 992B Jul 1 00:06 ../
drwxr-xr-x@ 9 arne staff - 288B Jul 1 00:38 .git/
-rw-r--r--@ 1 arne staff - 311B Jul 1 00:36 README.md
-rw-r--r--@ 1 arne staff - 641B Jul 1 00:36 compose.yaml
drwxr-xr-x@ 4 arne staff - 128B Jul 1 00:07 subdir/
$ ls -alh
total 16
drwxr-xr-x@ 9 arne staff - 288B Jul 1 00:39 ./
drwxr-xr-x 31 arne staff - 992B Jul 1 00:06 ../
drwxr-xr-x@ 9 arne staff - 288B Jul 1 00:39 .git/
-rw-r--r--@ 1 arne staff - 311B Jul 1 00:36 README.md
-rw-r--r--@ 1 arne staff - 641B Jul 1 00:36 compose.yaml
drwxr-xr-x@ 4 arne staff - 128B Jul 1 00:07 subdir/
drwxr-xr-x@ 2 arne staff - 64B Jul 1 00:39 testfile/
drwxr-xr-x@ 2 arne staff - 64B Jul 1 00:39 testfile2/
drwxr-xr-x@ 2 arne staff - 64B Jul 1 00:39 testfile3/