Server tries to read a different config file than it is supposed to

I thought I understood how specifying a config file path for the server
works, but that's apparently not the case.
The cluster data is at */storage/postgresql/9.4/data*.
The config files are at */etc/postgresql/9.4/main* (this is the default
location on Ubuntu).
This is how the beginning of */etc/postgresql/9.4/main/postgresql.conf*
looks like:
data_directory = '/storage/postgresql/9.4/data'
hba_file = '/etc/postgresql/9.4/main/pg_hba.conf'
ident_file = '/etc/postgresql/9.4/main/pg_ident.conf'
So I wrote a few scripts to make my life easier, e.g. *pg94start.sh*:
su postgres -c "/usr/lib/postgresql/9.4/bin/pg_ctl -D
/storage/postgresql/9.4/data -o '-c
config_file=/etc/postgresql/9.4/main/postgresql.conf'"
But running this script did not work, the server would not start. So I
checked the log file and there was:
*FATAL: could not open file "/storage/postgresql/9.4/data/postgresql.conf":
Permission denied*
After fixing the ownership of this file, it worked.
What's the reason the server was trying to access that file? Why does not
the override given by the *config_file* parameter work?
Thank you.

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