[ale] Pi - how to change /usr/local/bin when / is RO?

[neal at mnopltd.com]

or, just let god sort it out:

sync
reboot

since I'm dinking with it to fix startup anyway.


On 2020-11-22 09:20, DJ-Pfulio via Ale wrote:
> And don't forget to put it back:
> # mount -o remount,ro /
> 
> On 11/22/20 9:55 AM, Neal Rhodes via Ale wrote:
>> Wow.  that's like, magic.   Yes, apparently.
>> 
>> I was thinking you'd have to unmount, and then the world goes away.
>> 
>> 
>> 
>> On 2020-11-22 07:35, Leam Hall via Ale wrote:
>>> Hey Neal, I'm not an RPi guy, but would a remount work?
>>> 
>>>     mount -o remount,rw /
>>> 
>>> Leam
>>> 
>>> On 11/22/20 8:27 AM, Neal Rhodes via Ale wrote:
>>>> I'm betting there is a way to do this.
>>>> 
>>>> JackTrip Virtual Studio runs on a Pi 3B.
>>>> 
>>>> Their init script needs to change to enable microphone bias voltage 
>>>> on startup.
>>>> 
>>>> amixer set 'ADC Mic Bias',0 'Mic Bias on'
>>>> 
>>>> In order for me to just hand this device to a musician and have them 
>>>> plug it in, I need to modify their init script in /usr/local/bin.
>>>> 
>>>> However, as you can see below, this is mounted read-only.
>>>> 
>>>> How does one get around this?
>>>> 
>>>> regards,
>>>> 
>>>> Neal
>>>> 
>>>> 
>>>> root at jacktrip:/usr/local/bin$ mount
>>>> /dev/mmcblk0p2 on / type ext4 (ro,noatime)
>>>> devtmpfs on /dev type devtmpfs 
>>>> (rw,relatime,size=440756k,nr_inodes=110189,mode=755)
>>>> sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
>>>> proc on /proc type proc (rw,relatime)
>>>> tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
>>>> devpts on /dev/pts type devpts 
>>>> (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
>>>> tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
>>>> tmpfs on /run/lock type tmpfs 
>>>> (rw,nosuid,nodev,noexec,relatime,size=5120k)
>>>> tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
>>>> cgroup2 on /sys/fs/cgroup/unified type cgroup2 
>>>> (rw,nosuid,nodev,noexec,relatime,nsdelegate)
>>>> cgroup on /sys/fs/cgroup/systemd type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
>>>> none on /sys/fs/bpf type bpf 
>>>> (rw,nosuid,nodev,noexec,relatime,mode=700)
>>>> cgroup on /sys/fs/cgroup/blkio type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,blkio)
>>>> cgroup on /sys/fs/cgroup/pids type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,pids)
>>>> cgroup on /sys/fs/cgroup/devices type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,devices)
>>>> cgroup on /sys/fs/cgroup/net_cls type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,net_cls)
>>>> cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
>>>> cgroup on /sys/fs/cgroup/freezer type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,freezer)
>>>> cgroup on /sys/fs/cgroup/cpuset type cgroup 
>>>> (rw,nosuid,nodev,noexec,relatime,cpuset)
>>>> systemd-1 on /proc/sys/fs/binfmt_misc type autofs 
>>>> (rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct)
>>>> mqueue on /dev/mqueue type mqueue (rw,relatime)
>>>> debugfs on /sys/kernel/debug type debugfs (rw,relatime)
>>>> configfs on /sys/kernel/config type configfs (rw,relatime)
>>>> tmpfs on /var/tmp type tmpfs (rw,nosuid,nodev,relatime)
>>>> tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime)
>>>> tmpfs on /var/log type tmpfs (rw,nosuid,nodev,relatime)
>>>> /dev/mmcblk0p1 on /boot type vfat 
>>>> (ro,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro) 
>>>> tmpfs on /run/user/1000 type tmpfs 
>>>> (rw,nosuid,nodev,relatime,size=94804k,mode=700,uid=1000,gid=1000)
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