Use life cycle hooks with OpenShift ConfigMap/Secret

[commonquail]

I hoped to use the base postgresql:10 image in OpenShift (3.11) and bootstrap it using the documented life cycle hooks with ConfigMaps and/or Secrets -- without making a custom image, that is. Unfortunately that doesn't work.

process_extending_files delegates to get_matched_files which calls find with both -maxdepth 1 and -type f. OpenShift mounts the paths as symlinks to a (symlink to a) sibling directory, a bit like this:

$ ls -al /opt/app-root/src/postgresql-init/
total 0
drwxrwsrwt. 3 root     1000390000 120 Apr 24 12:13 .
drwxrwxr-x. 1 postgres root        29 Apr 24 12:13 ..
drwxr-sr-x. 2 root     1000390000  80 Apr 24 12:13 ..2019_04_24_12_13_09.447944352
lrwxrwxrwx. 1 root     root        31 Apr 24 12:13 ..data -> ..2019_04_24_12_13_09.447944352
lrwxrwxrwx. 1 root     root        16 Apr 24 12:13 00-init.sh -> ..data/00-init.sh
lrwxrwxrwx. 1 root     root        20 Apr 24 12:13 bootstrap.sql -> ..data/bootstrap.sql

That is, postgresql-init/00-init.sh is a symlink, which -type f excludes, pointing to a file in a subdirectory, which -maxdepth 1 excludes. Could one of these restrictions be lifted?