Ubuntu: What causes the changes in output of ps for GNOME Terminal in 15.04?



Question:

Working on this answer, I found out that the output of ps commands has quite changed in 15.04.

A few examples

in 14.04, the output of ps -e shows on gnome-terminal:

$ ps -e  19006 ?        00:00:00 gnome-terminal  

while in 15.04:

$ ps -e  24959 ?        00:00:00 gnome-terminal-  

(mind the 15 characters)

Curious to the long version, I ran ps -e ww:

In 14.04:

$ ps -e ww  19006 ?        Sl     0:01 gnome-terminal  

while in in 15.04

$ ps -e ww  24959 ?        Rl     0:01 /usr/lib/gnome-terminal/gnome-terminal-server --app-id com.canonical.Terminal.qVQkBaeWjRVoRiJKYQVkNNyrboXUfVrj  

looking for the application, corresponding to the pid:

In 14.04:

$ ps -p 19006 -o comm=  gnome-terminal  

while in 15.04:

$ ps -p 24959 -o comm=  

again the 15 characters (as expected):

gnome-terminal-  

In the linked question, I solved it by deriving the application name from the WM_CLASS, as mentioned in the output of the xprop command. I would prefer however to use the "old fashioned" ps -p 19006 -o comm=, which is more efficient.

These differences have quite some consequences for usage in scripts. My question is: does anyone have information on what is the reasoning behind this or what it is caused by?


Solution:1

It seems it has to do with changes made to gnome-terminal. However, scanning the changelogs and news I couldn't find anything specific.

As you can see here in the file list of the 14.04 gnome-terminal package, the /usr/lib/ directory does not even exist.

/usr/bin/gnome-terminal  /usr/bin/gnome-terminal.wrapper  /usr/share/applications/gnome-terminal.desktop  /usr/share/doc/gnome-terminal/AUTHORS  /usr/share/doc/gnome-terminal/NEWS.gz  /usr/share/doc/gnome-terminal/README  /usr/share/doc/gnome-terminal/changelog.Debian.gz  /usr/share/doc/gnome-terminal/copyright  /usr/share/lintian/overrides/gnome-terminal  /usr/share/man/man1/gnome-terminal.1.gz  /usr/share/man/man1/gnome-terminal.wrapper.1.gz  /usr/share/menu/gnome-terminal  

In 15.04, the /usr/lib directory is included.

/usr/bin/gnome-terminal  /usr/bin/gnome-terminal.real  /usr/bin/gnome-terminal.wrapper  /usr/lib/gnome-terminal/gnome-terminal-migration  /usr/lib/gnome-terminal/gnome-terminal-server  /usr/lib/nautilus/extensions-3.0/libterminal-nautilus.so  /usr/share/appdata/gnome-terminal.appdata.xml  /usr/share/applications/gnome-terminal.desktop  /usr/share/dbus-1/services/org.gnome.Terminal.service  /usr/share/doc/gnome-terminal/AUTHORS  /usr/share/doc/gnome-terminal/NEWS.gz  /usr/share/doc/gnome-terminal/README.Debian  /usr/share/doc/gnome-terminal/changelog.Debian.gz  /usr/share/doc/gnome-terminal/copyright  /usr/share/glib-2.0/schemas/org.gnome.Terminal.gschema.xml  /usr/share/gnome-shell/search-providers/gnome-terminal-search-provider.ini  /usr/share/lintian/overrides/gnome-terminal  /usr/share/man/man1/gnome-terminal.1.gz  /usr/share/man/man1/gnome-terminal.wrapper.1.gz  /usr/share/menu/gnome-terminal  

gnome-terminal is a python script now; the changes were made in version 3.7 so it may have something to do with that.

I have not seen other applications that share this type of change.


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