Is there any meaning of the CentOS (I guess RedHat and if I remember correctly Fedora too) boot screen progress bar layers*?
I can't figure out any good search query for this, but maybe somebody will know...
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I'm not an expert, but from the source (ply-text-progress-bar.c) it looks like you set the overall percentage done and that the different colors/layers's progress is hard coded by the following, and other functions within that file:
brown_fraction = -(progress_bar->percent_done * progress_bar->percent_done) + 2 * progress_bar->percent_done; blue_fraction = progress_bar->percent_done; white_fraction = progress_bar->percent_done * progress_bar->percent_done;
So, it appears that it is a style choice with no underlying meaning.
The software that is running to produce that bar is called Plymouth, and it only appears if you have
rhgb in your kernel arguments. It basically takes the output of the startup sequence and presents it according to the chosen theme. In this case, it is using the
text theme, probably because it can't start the graphical theme.