Alpine Linux: busybox-extras install/uninstall

busybox-extras-install.txt

Related to this pull-request:
https://github.com/alpinelinux/aports/pull/1092

Steps:
1. upgrade busybox to the one, which has busybox-extras
2. telnet does not exist anymore
3. add busybox-extras
4. telnet exists
5. uninstall busybox-extras and re-install busybox
6. telnet does not exist anymore
7. repeat step 3 and 4

/ # apk add -u busybox
(1/1) Upgrading busybox (1.26.2-r2 -> 1.26.2-r3)
Executing busybox-1.26.2-r3.post-upgrade
-> ftpget is now in busybox-extras
-> ftpput is now in busybox-extras
-> telnet is now in busybox-extras
-> tftp is now in busybox-extras
-> ftpd is now in busybox-extras
-> httpd is now in busybox-extras
Executing busybox-1.26.2-r3.trigger
OK: 6 MiB in 16 packages
/ # which telnet
/ # apk add busybox-extras
(1/2) Purging busybox (1.26.2-r3)
(2/2) Installing busybox-extras (1.26.2-r3)
Executing busybox-extras-1.26.2-r3.post-install
-> NOTE: To uninstall busybox-extras properly, do this:
  # apk del busybox-extras
  # apk add /var/cache/apk/busybox-1.26.2-r3...apk # pick latest
  # apk add busybox
Executing busybox-extras-1.26.2-r3.trigger
OK: 6 MiB in 16 packages
/ # which telnet
/usr/bin/telnet
/ # apk del busybox-extras
World updated, but the following packages are not removed due to:
  busybox-extras: busybox-initscripts alpine-base alpine-conf busybox-suid
                  openrc alpine-baselayout

OK: 6 MiB in 16 packages
/ # apk add (...)/busybox-1.26.2-r3.apk
(1/2) Installing busybox (1.26.2-r3)
Executing busybox-1.26.2-r3.post-install
(2/2) Purging busybox-extras (1.26.2-r3)
Executing busybox-1.26.2-r3.trigger
OK: 6 MiB in 16 packages
/ # apk add busybox
OK: 6 MiB in 16 packages
/ # which telnet
/ # apk add busybox-extras
(1/2) Purging busybox (1.26.2-r3)
(2/2) Installing busybox-extras (1.26.2-r3)
Executing busybox-extras-1.26.2-r3.post-install
-> NOTE: To uninstall busybox-extras properly, do this:
  # apk del busybox-extras
  # apk add /var/cache/apk/busybox-1.26.2-r3...apk # pick latest
  # apk add busybox
Executing busybox-extras-1.26.2-r3.trigger
OK: 6 MiB in 16 packages
/ # which telnet
/usr/bin/telnet