Archive for October, 2013

apt versions/release special modifiers

October 23, 2013

Recently the ansible apt module got fnmatch (shell) style wildcard support for installing packages. Aparently this broke the workflow for some users who passed a “*” via a variable to apt to get the candidate version installed.

A more descriptive way of achiving this is to use the one of the special words “candidate”, “installed”, “newest” in the version tag or in the release tag.

For example you can write:

# apt-get install ansible/newest
(or)
# apt-get install 2vcard=candidate

As in the ansible case, this can be a useful default for script that calcuclate a version and need to fallback to a default.

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apt 0.9.12

October 12, 2013

The recently released apt 0.9.12 contains a bunch of good stuff, bugfixes and cleanups. But there are two new feature I particularly like.

The first is the new parameter “–with-new-pkgs” for the upgrade
command:

# apt-get upgrade --with-new-pkgs

that will install new dependencies on the upgrade but never remove
packages. A typical use-case is a stable system that gets a kernel
with a new kernel ABI package.

The second is “–show-progress” for
install/remove/upgrade/dist-upgrade which will show inline progress
when dpkg is running to indicate the global progress.

# apt-get install --show-progress tea
...
Selecting previously unselected package tea-data.
(Reading database ... 380116 files and directories currently installed.)
Unpacking tea-data (from .../tea-data_33.1.0-1_all.deb) ...
Progress: [ 10%]
Progress: [ 20%]
Progress: [ 30%]
Selecting previously unselected package tea.
Unpacking tea (from .../tea_33.1.0-1_amd64.deb) ...
Progress: [ 40%]
Progress: [ 50%]
Progress: [ 60%]
Processing triggers for doc-base ...
Processing 2 added doc-base files...
Registering documents with scrollkeeper...
...
Processing triggers for man-db ...
Setting up tea-data (33.1.0-1) ...
Progress: [ 70%]
Progress: [ 80%]
Setting up tea (33.1.0-1) ...
Progress: [ 90%]
Progress: [100%]

For the install progress, there is also a new experimental option
“Dpkg::Progress-Fancy”. It will display a persistent progress status bar in the last terminal line. This works like this:

# apt-get -o Dpkg::Progress-Fancy=true install tea

apt-install-fancy-progress

This kind of information is obviously most useful on complex operations like big installs or (release) upgrades.