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

[DJ-Pfulio]

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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