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

[Ed Cashin]

Have you already tried (as root) ...

mount -o remount,rw /usr/local/bin

?  I usually never would post something like that without double checking,
but I think that's what I'd usually do in that situation.


On Sun, Nov 22, 2020 at 8:27 AM Neal Rhodes via Ale <ale at ale.org> 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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-- 
  Ed Cashin <ecashin at noserose.net>
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