Category Archives: Debian

Vim as Debian default

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The default text editor in installations of Debian and its derivatives is Nano, largely because it’s a simple and small editor. If you’re a Vim user, you might find it a little jarring to be presented with a modeless editor when you run commands like visudo or vipw.

Debian’s alternatives system makes this reasonably easy to adjust. If you have Vim installed, it should be available as one of the possible implementations of the editor alternative. You can check this with the update-alternatives command:

# update-alternatives --list editor
/bin/ed
/usr/bin/nano
/usr/bin/vim.basic

This shows that Vim is available as an alternative with /usr/bin/vim.basic, so you can update the symlink structure that defines the default editor like so:

# update-alternatives --set editor /usr/bin/vim.basic
... using /usr/bin/vim.basic to provide /usr/bin/editor (editor) in manual mode.

Now if you fire up visudo, vipw, or sudo -e you should find that Vim is fired up instead of the editor you didn’t want.

On my own workstation I have the latest Vim compiled from Mercurial and installed into /usr/local via checkinstall, so I had to add this to the alternatives system before I could use it:

# update-alternatives --install /usr/bin/editor editor /usr/local/bin/vim 200 \
    --slave /usr/share/man/man1/editor.1.gz editor.1.gz /usr/local/share/man/man1/vim.1.gz
# update-alternatives --set editor /usr/local/bin/vim
... using /usr/bin/vim.basic to provide /usr/bin/editor (editor) in manual mode.

Other relevant alternatives include the vi implementation for your system, which of course may not necessarily be Vim; some operating systems install the smaller and more vi-faithful nvi.

Packaging built software

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The Debian package repository is enormous, and the Sid distribution is in most cases reasonably up-to-date, but it’s still sometimes desirable to build an application and install it into /usr/local when a packaged implementation either isn’t available or is too out of date, or if you’re involved in the development of a project and want to try out a fresh build that hasn’t been packaged yet.

The usual cycle of configuring, compiling, and installing many open-source applications for Unix-like systems applies here:

$ ./configure
$ make
# make install

The above is normally the approach taken to install code compiled on the machine, rather than through packages. One problem with this approach is that it doesn’t allow many of the advantages that a system running purely on packages does; dpkg -l will no longer give you a complete overview of all the system’s software, and to remove the software and its configuration files you may have to manually delete it rather than using apt-get purge.

Fortunately, there exists a tool called checkinstall to allow having the best of both worlds. After installing this tool via apt-get install checkinstall, you’re able to build a package for your locally built software according to the rules defined in its Makefile, and install that the same way as any other package.

Instead of typing make install, type checkinstall, and you will be prompted for details about the package, including its description, which is then built and installed. In this example, I’m compiling Vim from source, which works very well. I’ve also successfully installed tools like pam_ssh_agent_auth and tmux this way.

With this done, the package’s files are installed in /usr/local, and it appears in the list of installed packages along with my explanation of its contents:

$ ./configure
$ make
$ sudo -s
# checkinstall
...
*****************************************
**** Debian package creation selected ***
*****************************************

This package will be built according to these values:

0 -  Maintainer: [ Tom Ryder <tom@sanctum.geek.nz> ]
1 -  Summary: [ Custom build of latest Vim 7.3 ]
2 -  Name:    [ vim ]
3 -  Version: [ 2:7.4 ]
4 -  Release: [ 1 ]
5 -  License: [ GPL ]
6 -  Group:   [ checkinstall ]
7 -  Architecture: [ amd64 ]
8 -  Source location: [ vim ]
9 -  Alternate source location: [  ]
10 - Requires: [  ]
11 - Provides: [ vim ]
12 - Conflicts: [  ]
13 - Replaces: [  ]

Note that I’m assigning it a version number greater than the Debian repository’s vim package, which is a simple way to prevent it being replaced. You can also do this via the /etc/apt/preferences file to prevent replacement of all packages from the checkinstall group.

With this done, my custom build of Vim now shows in the package list, and its files are correctly installed in /usr/local:

# dpkg -l | grep vim
ii  vim  2:7.4-1 Custom build of latest Vim 7.3
# dpkg -S vim
vim: /usr/local/share/vim/vim73/bugreport.vim
vim: /usr/local/share/vim/vim73/plugin
vim: /usr/local/share/vim/vim73/ftplugin/postscr.vim
vim: /usr/local/share/man/it.UTF-8/man1/vim.1.gz
...

The .deb package built by checkinstall is also present in my build directory for me to keep for later, or for installation on another compatible server:

$ ls *.deb
vim_7.4-1_amd64.deb

It’s worth noting that checkinstall is not a Debian-specific tool; it works for other packaging systems like RPM and Slackware, too.