Follow-up for 0f958c8d4f.
systemctl is called many times by dnf or so, and missing /proc/ is not
a user's fault, but package manager's issue.
With this commit, we can suppress the warning by updating rpm macros if
necessary.
Previously 'systemctl edit' would only operate on
'override.conf', but users may need more than that.
Thus the new option '--drop-in' is added to allow
users to specify the drop-in file name.
Closes#25767
In cases like packaging scripts, it might be desired to use
enable/disable on units without install info. So, adding an
option '--no-warn' to suppress the warning.
In many places we spelled out the phrase behind "initrd" in full, but this
isn't terribly useful. In fact, no "RAM disk" is used, so emphasizing this
is just confusing to the reader. Let's just say "initrd" everywhere, people
understand what this refers to, and that it's in fact an initramfs image.
Also, s/i.e./e.g./ where appropriate.
Also, don't say "in RAM", when in fact it's virtual memory, whose pages
may or may not be loaded in page frames in RAM, and we have no control over
this.
Also, add <filename></filename> and other minor cleanups.
In the context of a table, both would be generally understood to have the same
meaning. "n/a" is a strange beast. It was useful when tables were produced on
the typewriter with "---------" used to separate rows. It is visually more
pleasing to use "-", and there is no risk of it being mistaken for a row
separator.
getopt allows non-ambiguous abbreviations, so backwards-compat is maintained, and
people can use --kill-who (or even shorter abbreviations). English is flexible,
so in common speach people would use both forms, even if "whom" is technically
more correct. The advantage of using the longer form in the code is that we
effectively allow both forms, so we stop punishing people who DTGCT¹, but still
allow people to use the spoken form if they prefer.
1. Do the gramatically correct thing
We have vendor presets, and local admin presets, and runtime presets
(under /usr/lib, /usr/local/lib and /etc, /run, respectively). When we
display preset state, it can be configured in any of those places, so
we shouldn't say anything about the origin.
(Another nice advantage is that it improves alignment:
[root@f36 ~]# systemctl list-unit-files multipathd.service
UNIT FILE STATE VENDOR PRESET
multipathd.service enabled enabled
^ this looks we have a "PRESET" column that is empty.)
