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bug#33285: Installing, then removing, a package yields a different profi

From: Chris Marusich
Subject: bug#33285: Installing, then removing, a package yields a different profile
Date: Mon, 05 Nov 2018 22:25:46 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)


I've noticed that if I do the following...

guix package -p .guix-profile -i hello
guix package -p .guix-profile -i coreutils
guix package -p .guix-profile -r coreutils

...I get profile generations like the following:

.guix-profile-1-link  ->  /gnu/store/mbvwb1pv8ps0l39gil41g4zj3khx3r8p-profile
.guix-profile-2-link  ->  /gnu/store/m6cwnnxcccnd8bga52jxn74vm67n7ry1-profile
.guix-profile-3-link  ->  /gnu/store/qfpmx9rz7kxa8w8r2pz4vj8ilbi70dcp-profile

However, the 1st and 3rd generations are practically the same:

--8<---------------cut here---------------start------------->8---
$ diff -r /gnu/store/mbvwb1pv8ps0l39gil41g4zj3khx3r8p-profile 
diff -r /gnu/store/mbvwb1pv8ps0l39gil41g4zj3khx3r8p-profile/etc/profile 
< export 
> export 
> PATH="${GUIX_PROFILE:-/gnu/store/qfpmx9rz7kxa8w8r2pz4vj8ilbi70dcp-profile}/bin${PATH:+:}$PATH"
[1] address@hidden:/tmp/tmp.ZOTdkBr4rD
--8<---------------cut here---------------end--------------->8---

Now, this isn't really a problem, since it isn't wasting space, and it
doesn't take long to build.  It's more of a curiosity.  Why is it that
profile generations 1 and 3 don't both point to the same profile in the
store?  Is this expected behavior?

I wasn't sure what would happen when I tried this.  I had guessed
(incorrectly) that generation 3 would point to the same profile that had
been built for generation 1, so I was a little surprised by this.


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