release v7.6.0: use prefix /usr/local instead of /usr #479

--remove-oldprefix: new option -479

CHANGELOG.md

@@ -6,6 +6,19 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 Project website: https://github.com/mviereck/x11docker
 
+## [7.6.0](https://github.com/mviereck/x11docker/releases/tag/v7.6.0) - 2023-01-18
+### Changed
+ - Up to version 7.5.0 x11docker installed itself with prefix `/usr`,
+   now it uses `/usr/local`. This serves to follow the 
+   [Linux Foundation specifications of `/usr/local`.](https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s09.html).
+   To help with the transition, a new option `--remove-oldprefix`
+   was introduced. Recommended procedure:
+   - First run:      `x11docker --update`
+   - Afterwards run: `x11docker --remove-oldprefix`
+### Added
+ - `--remove-oldprefix`: Remove installation in old prefix `/usr`.
+   [(479)](https://github.com/mviereck/x11docker/issues/479)
+
 ## [7.5.0](https://github.com/mviereck/x11docker/releases/tag/v7.5.0) - 2023-01-16
 ### Added
  - `man` page for x11docker. (Run update from 7.4.2 twice to install it.)
@@ -21,7 +34,7 @@ Project website: https://github.com/mviereck/x11docker
    [(478)](https://github.com/mviereck/x11docker/issues/478)
  - Replace `getent` with custom `grep` command.
    [(477)](https://github.com/mviereck/x11docker/issues/477)
- - `--install|--update*`: Do not dpend on backend.
+ - `--install|--update*`: Do not depend on backend.
    [(470)](https://github.com/mviereck/x11docker/issues/470)
 ### Deprecated
  - `--backend=proot`: Deprecated because likely no one uses it,

README.md

@@ -78,7 +78,8 @@ Files to work on can be shared between host and container.
 Since a while Docker distributes a version called "Docker Desktop" that runs Docker in a QEMU VM. x11docker is not designed to support this VM based version.
 Instead, use x11docker with the native ["Docker Engine Server version"](https://docs.docker.com/engine/install/#server) that uses your host kernel to run containers.
  - If you install Docker from your distribution's repository, you'll likely get this native version.
- - If you prefer podman over Docker, you'll don't need to care about this difference.
+ - The supported native Docker Engine package name is mostly `docker.io` or `docker-ce`, in opposite to the non-supported VM based `docker-desktop` package.
+ - If you prefer podman over Docker, you don't need to care about this difference.
 
 ### TL;DR
 For a quick start:
@@ -452,16 +453,18 @@ As root you can install, update and remove x11docker in system directories to be
  - `x11docker --update-master` : download and install latest master version from github.
  - `x11docker --remove` : remove all files installed by x11docker.
    - Note: This does not remove `~/.local/share/x11docker` where it stores persistent files of option `--home`.
+ - `x11docker --remove-oldprefix` : Before version 7.6.0 x11docker installed itself into `/usr/bin`.
+   Now it installs into `/usr/local/bin`. Use `--remove-oldprefix` to remove `/usr/bin` installations.
 
 To see the difference between current and coming updated version, you can use optional argument `diff` for `--update` and `--update-master`.
 Example: `x11docker --update-master=diff` will show you the code changes from your current installation to latest master/beta version without installing it.
 
 #### Installed files
 What the installation does (just for information):
- - Copies script `x11docker` to `/usr/bin`. 
- - Installs icon `x11docker.png` in `/usr/share/icons` using `xdg-icon-resource`. 
- - Copies documentation `README.md`, `CHANGELOG.md` and `LICENSE.txt` to `/usr/share/doc/x11docker`.
- - Stores `man` page for x11docker in `/usr/share/man/man1/x11docker.1.gz`.
+ - Copies script `x11docker` to `/usr/local/bin`. 
+ - Installs icon `x11docker.png` below `/usr/share/icons` using `xdg-icon-resource`. 
+ - Copies documentation `README.md`, `CHANGELOG.md` and `LICENSE.txt` to `/usr/local/share/doc/x11docker`.
+ - Stores `man` page for x11docker in `/usr/local/share/man/man1/x11docker.1.gz`.
  
 #### Shortest way for first installation:
  - For systems using `sudo`: