From 99fb80a367b8afd71995330b28bfaa0a2ccb1b83 Mon Sep 17 00:00:00 2001
From: David Thompson <davet@gnu.org>
Date: Wed, 21 Mar 2018 21:46:51 -0400
Subject: Update libreplanet talk.

---
 2018-03-25-guix-libreplanet/guix-libreplanet.org | 121 +++++++++++++++++++----
 2018-03-25-guix-libreplanet/guix-libreplanet.pdf | Bin 132573 -> 169367 bytes
 2 files changed, 101 insertions(+), 20 deletions(-)

diff --git a/2018-03-25-guix-libreplanet/guix-libreplanet.org b/2018-03-25-guix-libreplanet/guix-libreplanet.org
index 511c6a0..d6958bc 100644
--- a/2018-03-25-guix-libreplanet/guix-libreplanet.org
+++ b/2018-03-25-guix-libreplanet/guix-libreplanet.org
@@ -69,6 +69,12 @@
   - incompatible libraries between systems
   - high barrier to entry for common package managers
 
+* common issues
+
+  trying out new stuff can lead to sadness
+
+  - ever upgrade your distro, reboot, and get an unusable system?
+
 * freedom: embedded
 
   GuixSD removes many of the common barriers that prevent users from
@@ -93,6 +99,10 @@
 
   Users can build and install software *without root privileges*
 
+  tired: =sudo apt install emacs=
+
+  wired: =guix package -i emacs=
+
 * unprivileged package management
 
   Each user may have one or more “profiles”, a union of many packages.
@@ -104,13 +114,25 @@
 
 * experiment without fear
 
+  =guix package --upgrade emacs=
+
+  oh no, the new version of Emacs is broken!
+
   =guix package --roll-back=
 
+* experiment without fear
+
   =guix system reconfigure=
 
+  oh no, the latest GuixSD updates broke my system!
+
+  <image of grub menu with older generations?>
+
 * inspecting source code
 
-  =guix build --source=
+  quickly grab the source code for a package
+
+  =guix build --source gimp=
 
 * inspecting dependency graph
 
@@ -130,46 +152,106 @@
 
 * sharing development environments
 
-  =guix environment=
+  #+BEGIN_SRC scheme
+    (use-modules (guix profiles)
+                 (gnu packages base)
+                 (gnu packages guile))
+
+    (packages->manifest
+     (list gnu-make
+           guile-2.2
+           guile-syntax-highlight
+           haunt))
+  #+END_SRC
+
+  use it:
 
-  <minimal environment file example>
+  =guix environment --manifest=guix.scm=
 
 * sharing binaries
 
-  Use =guix publish= to spawn a web server that allows other Guix
-  users to download the software you've already built
+  start a server to share your builds:
+
+  #+BEGIN_SRC sh
+    guix publish
+  #+END_SRC
+
+  have a friend download them:
 
   #+BEGIN_SRC sh
     guix build \
-         --substitute-urls=http://guix.dthompson.us:8080 \
+         --substitute-urls=http://guix.example.com:8080 \
          hello
   #+END_SRC
 
 * reproducible builds
 
-  did anyone attend "You think you're not a target? A tale of three
-  developers..." by Chris Lamb yesterday?
+  reproducible builds produce *bit-identical binaries* when performed
+  multiple times under the same conditions.
 
-  =guix build --rounds=N=
+  requires fixing issues in upstream build systems that are
+  nondeterministic.
+
+* reproducible builds
 
-* verifying binaries
+  this is a *cross-distro effort*, but Guix facilitates
+  reproducibility more than others
+
+  see Chris Lamb's talk /You think you're not a target? A tale of
+  three developers.../ from yesterday for more perspective
+
+* reproducible builds
+
+  is this build reproducible on my machine?
+
+  =guix build --rounds=3 hello=
+
+* challenge authority
+
+  is this build reproducible on many machines?
+
+  is this build compromised?
 
   =guix challenge=
 
 * customize packages
 
-  =guix edit=
+  show me how Ruby is built:
 
-  =guix build=
+  #+BEGIN_SRC sh
+    export EDITOR=emacs
+    guix edit ruby
+  #+END_SRC
+
+* customize packages
+
+  let's make some changes!
+
+  #+BEGIN_SRC sh
+    git clone https://git.savannah.gnu.org/git/guix.git
+    cd guix
+    guix environment guix
+    ./configure
+    make
+    guix build ruby
+  #+END_SRC
 
 * interoperate with other systems
 
-  =guix pack=
+  need a Docker image?
 
-* extending
+  =guix pack --format=docker guile emacs geiser=
+
+  \tiny(see /Solving the deployment crisis with GNU Guix/ from
+  LibrePlanet 2016 for reasons why Docker may not be so great)
+
+* extending guix
 
   GuixSD is essentially a big Scheme library
 
+  easy to write new tools that use the exact same APIs that the core
+  Guix tools use
+
 * literally: embedded
 
   GuixSD now runs on the Beaglebone Black single-board computer!
@@ -178,13 +260,12 @@
 
   GNU Guix is a welcoming community:
 
-  we have a *code of conduct* and *enforce* it
-
-  we have started seeking new contributors via *Outreachy*
-
-  we participate in *Google Summer of Code* every year
+  - we have a *code of conduct* and *enforce* it
+  - we have started seeking new contributors via *Outreachy*
+  - we participate in *Google Summer of Code* every year
+  - oh, and no copyright assignment (in case you were wondering)
 
-  oh, and no copyright assignment (in case you were wondering)
+  join us!
 
 * thanks!
 
diff --git a/2018-03-25-guix-libreplanet/guix-libreplanet.pdf b/2018-03-25-guix-libreplanet/guix-libreplanet.pdf
index 6bd9226..09b3615 100644
Binary files a/2018-03-25-guix-libreplanet/guix-libreplanet.pdf and b/2018-03-25-guix-libreplanet/guix-libreplanet.pdf differ
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