Comment 9 for bug 2064926

I started writing my comment before you posted your log output. That's why I saw it only afterwards.

I tracked it down to: /usr/lib/dhcpcd/dhcpcd-run-hooks -> /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname -> need_hostname function:

```
 is_default_hostname "$hostname" && return 0
```

/usr/lib/dhcpcd/dhcpcd-hooks/10-mtu calls "set -e" which is still present when sourcing /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname.

Distilled down `test` shell code:

```
#!/bin/sh
set -e

need_hostname()
{
    false && return 0
    echo "remaining"
}

need_hostname
```

busybox behaves differently than dash in that case:

```
$ sh test; echo $?
remaining
0
$ busybox test; echo $?
1
```