composer (and /usr/local/bin) need to be writeable in web image

[rfay]

Describe the bug

composer (and /usr/local/bin) need to be writeable in web image

To Reproduce

$ ddev exec composer self-update --1
Warning: You forced the install of 1.10.17 via --1, but 2.0.4 is the latest stable version. Updating to it via composer self-update --stable is recommended.
Upgrading to version 1.10.17 (1.x channel).



  [Composer\Downloader\FilesystemException]
  Filesystem exception:
  Composer update failed: "/usr/local/bin/composer" could not be written.
  rename(/usr/local/bin/composer): Failed to open stream: Permission denied

[digchris]

Hi, I got exactly the same error when attempting to upgrade composer on my Ubuntu 20.04 system running:

Docker version 19.03.13, build 4484c46d9d and
DDEV-Local version v1.15.3
commit v1.15.3
db drud/ddev-dbserver-mariadb-10.2:v1.15.1
dba phpmyadmin/phpmyadmin:5
ddev-ssh-agent drud/ddev-ssh-agent:v1.15.1
docker 19.03.13
docker-compose 1.25.0-rc4
os linux
router drud/ddev-router:v1.15.1
web drud/ddev-webserver:v1.15.3

Here is the cli response when I tried to self-update Composer:
$ ddev exec composer self-update --stable
Updating to version 2.0.6 (stable channel).
Downloading (100%)

[Composer\Downloader\FilesystemException]
Filesystem exception:
Composer update failed: "/usr/local/bin/composer" could not be written.
rename(/usr/local/bin/composer): failed to open stream: Permission denied

self-update [-r|--rollback] [--clean-backups] [--no-progress] [--update-keys] [--stable] [--preview] [--snapshot] [--1] [--2] [--set-channel-only] [--] []

Failed to execute command composer self-update --stable: exit status 1

[rfay]

You can easily use ddev exec sudo composer self-update --stable if you'd like. It has always worked. You can also update it with a custom Dockerfile, which is easier. See #2383 (comment)

[digchris]

Yes, your suggestion worked a treat.
Thanks for responding :)