Description:

On a newly (last week) installed Arch system (via Antergos), couchdb fails to start because of a bad symlink to erlang.

Steps to reproduce:

* Install erlang (erlang-19.1.6-1, note: not erlang-nox)
* Install couchdb (couchdb-2.0.0-1)
* sudo systemctl start couchdb
* sudo journalctl -r
* "/usr/lib/couchdb/bin/couchdb: line 29: /usr/lib/couchdb/bin/../erts-8.1/bin/erlexec: No such file or directory"

The problem is couchdb's symlink to erlang is wrong.

From /usr/lib/couchdb

"ls -la" returns...

# ls -la
total 292
drwxr-xr-x 8 root root 4096 Sep 26 09:51 .
drwxr-xr-x 262 root root 159744 Nov 21 06:56 ..
drwxr-xr-x 2 root root 4096 Sep 26 09:51 bin
lrwxrwxrwx 1 root root 24 Sep 26 09:51 erts-8.1 -> /usr/lib/erlang/erts-8.1
drwxr-xr-x 2 root root 4096 Sep 26 09:51 etc
drwxr-xr-x 45 root root 4096 Sep 26 09:51 lib
-rw-r--r-- 1 root root 102450 Sep 26 09:51 LICENSE
drwxr-xr-x 3 root root 4096 Sep 26 09:51 releases
drwxr-xr-x 5 root root 4096 Sep 26 09:51 share
drwxr-xr-x 3 root root 4096 Sep 26 09:51 var


The correct target location for the symlink is /usr/lib/erlang/erts-8.1.1

Recreating the link "ln -s /usr/lib/erlang/erts-8.1.1 erts-8.1" now allows the service to start.