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< h2 class = "post-title" itemprop = "name headline" > How to rickroll people that try to run "rm -rf" on your system< / h2 >
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< h4 class = "post-meta" > < time datetime = "2016-07-28T16:00:00+02:00" itemprop = "datePublished" > Jul 28, 2016< / time > < / h4 >
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< strong >
WARNING: The method showed here could not prevent the actual execution of "rm -rf" if the "UNIX vandal" is clever enough. Proceed at your own risk, and make backups!
< / strong >
< p >
I like Rick Astley late 80's songs, and you can see them here in my Spotify:
< / p >
< p >
< img
src="https://dl.dropboxusercontent.com/s/t9vywa4yjotxv0o/Screenshot_20160728_154506.png?dl=0"
alt="My Spotify with a bunch of Rick Astley songs">
< / p >
< p >
I like rickrolling people too, especially if they are trying to delete my entire
< code > /home< / code > directory or, even worse, < code > /< / code > . Since I learned
how to use the < code > alias< / code > built-in, I wanted a way to prevent that
random people tinkering with my laptop (that I may forgot to lock) could
delete potentially important stuff, just for fun or boredom.
< / p >
< p >
The method that I will show will lock any < code > rm< / code > command runned in
both recursive and force mode, so < code > rm -rf< / code > , < code > rm -f -r< / code >
and < code > rm -r --force< / code > are all blocked, even if they are runned with
< code > sudo< / code > . I am going to alias the rm command in
< code > /etc/profile< / code > , < code > /etc/bash.bashrc< / code > and in
< code > /etc/zsh/zshrc< / code > (I am a zsh user) so that the rickroll will be
possible from all users, even root and the ones with a brand new
< code > .bashrc< / code > or < code > .zshrc< / code > . Here is the code I appended to
those files:
< / p >
< p >
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< figure class = "highlight" > < pre > < code class = "language-bash" data-lang = "bash" > < span class = "nb" > alias rm< / span > < span class = "o" > =< / span > /bin/rmAlias
< span class = "nb" > alias sudo< / span > < span class = "o" > =< / span > < span class = "s1" > 'sudo '< / span > < span class = "c" > # this enables aliases in sudo, see http://askubuntu.com/questions/22037/aliases-not-available-when-using-sudo< / span > < / code > < / pre > < / figure >
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< / p >
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< p >
Since < code > alias< / code > is not able to control the flags of the aliases (see
< a href = "http://apple.stackexchange.com/questions/50963/how-do-i-add-a-flag-to-an-alias" > here< / a > , we are going to redirect each call of < code > rm< / code > to
< code > /bin/rmAlias< / code > , that would run the command if it is safe. I did
not use a function because it is a bit tricky to make that work with
< code > sudo< / code > . So, let's see the code I put in < code > rmAlias< / code > :
< / p >
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< p >
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< figure class = "highlight" > < pre > < code class = "language-bash" data-lang = "bash" > < span class = "c" > #! /bin/bash< / span >
< span class = "c" > # Rickroll whoever tries to desert this system, even root.< / span >
< span class = "c" > # To achieve this, set the appropriate aliases even in /etc/profile and similars.< / span >
< span class = "c" > # Video played when rickrolling< / span >
< span class = "nv" > ROLLVIDEO< / span > < span class = "o" > =< / span > /opt/anti-rm/serious-video.mkv < span class = "c" > # it's just Never Gonna Give You Up on my system, but be free to customize this!< / span >
rickroll< span class = "o" > (){< / span >
< span class = "nb" > echo< / span > < span class = "s2" > "Never gonna desert this system..."< / span >
xdg-open < span class = "nv" > $ROLLVIDEO< / span > 2> & 1 &
< span class = "nb" > exit < / span > 0
< span class = "o" > }< / span >
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< span class = "k" > while < / span > < span class = "nb" > getopts< / span > < span class = "s2" > ":rf-"< / span > opt< span class = "p" > ;< / span > < span class = "k" > do< / span >
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< span class = "c" > # Prevent '--force' to be detected as -r and -f< / span >
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< span class = "k" > if< / span > < span class = "o" > [< / span > < span class = "s2" > "< / span > < span class = "nv" > $opt< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > "-"< / span > < span class = "o" > ]< / span > < span class = "p" > ;< / span > < span class = "k" > then
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< / span > < span class = "nv" > OPTIND< / span > < span class = "o" > =< / span > < span class = "nv" > $OPTIND< / span > +1
< span class = "k" > continue
fi
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if< / span > < span class = "o" > [< / span > < span class = "s2" > "< / span > < span class = "nv" > $opt< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > "r"< / span > < span class = "o" > ]< / span > < span class = "o" > ||< / span > < span class = "o" > [< / span > < span class = "s2" > "< / span > < span class = "nv" > $opt< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > "f"< / span > < span class = "o" > ]< / span > < span class = "p" > ;< / span > < span class = "k" > then
if< / span > < span class = "o" > [< / span > < span class = "s2" > "< / span > < span class = "nv" > $tmp< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > ""< / span > < span class = "o" > ]< / span > < span class = "p" > ;< / span > < span class = "k" > then
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< / span > < span class = "nv" > tmp< / span > < span class = "o" > =< / span > < span class = "nv" > $opt< / span >
< span class = "k" > continue
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elif< / span > < span class = "o" > [< / span > < span class = "s2" > "< / span > < span class = "nv" > $tmp< / span > < span class = "s2" > "< / span > < span class = "o" > !=< / span > < span class = "s2" > "< / span > < span class = "nv" > $opt< / span > < span class = "s2" > "< / span > < span class = "o" > ]< / span > < span class = "p" > ;< / span > < span class = "k" > then
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< / span > rickroll
< span class = "k" > fi
fi
done
for < / span > var < span class = "k" > in< / span > < span class = "s2" > "< / span > < span class = "nv" > $@< / span > < span class = "s2" > "< / span >
< span class = "k" > do
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if< / span > < span class = "o" > [[< / span > < span class = "s2" > "< / span > < span class = "nv" > $var< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > "--force"< / span > < span class = "o" > & & < / span > < span class = "s2" > "< / span > < span class = "nv" > $tmp< / span > < span class = "s2" > "< / span > < span class = "o" > =< / span > < span class = "s2" > "r"< / span > < span class = "o" > ]]< / span > < span class = "p" > ;< / span > < span class = "k" > then
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< / span > rickroll
< span class = "k" > fi
done< / span >
< span class = "c" > # If it's safe, just run rm< / span >
/bin/rm < span class = "s2" > "< / span > < span class = "nv" > $@< / span > < span class = "s2" > "< / span >
< span class = "nb" > exit< / span > < span class = "nv" > $?< / span > < / code > < / pre > < / figure >
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< / p >
< p >
It may look messy to a < em > UNIX< / em > guy more experienced than me, but it
works. The < code > getopts< / code > built-in sees if both the < code > -r< / code > and
the < code > -f< / code > flags are used and, if so, it starts
< code > rickroll()< / code > , which opens with < code > xdg-open< / code > that amazing
clip from < em > RickAstleyVEVO< / em > . From line 30 and below, the script checks
if the < code > --force< / code > flag is used instead of < code > -f< / code > .
< / p >
< p >
Let's give execution permissions to the script we have just created:
< / p >
< p >
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< figure class = "highlight" > < pre > < code class = "language-bash" data-lang = "bash" > < span class = "c" > # chmod +x /bin/rmAlias< / span > < / code > < / pre > < / figure >
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< / p >
< p >
Restart your shell, and enjoy. If you want to test safely, I suggest trying
to run < code > rm -rf< / code > with no folders or a nonexistant one, since this
script stops even these commands.
< / p >
< p >
If you want even more security, you can rename this script to
< code > /bin/rm< / code > and move the original one in some other place, getting rid of all the aliases. I prefer the solution above because it's tidier: you haven't to move anything. In fact, this could be just an AUR package...
< / p >
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Claudio Maggioni
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