Update lp2018 yet again.

2 files changed, 92 insertions, 30 deletions

diff --git a/2018-03-25-guix-libreplanet/guix-libreplanet.org b/2018-03-25-guix-libreplanet/guix-libreplanet.org
index f6409fe..8e65aa8 100644
--- a/2018-03-25-guix-libreplanet/guix-libreplanet.org
+++ b/2018-03-25-guix-libreplanet/guix-libreplanet.org
@@ -77,7 +77,7 @@
   figuring out how to view the exact source for a running program can
   be tricky
 
-  - source packages are good but are a bit arcane
+  - source packages are good but are a bit arcane IMO
 
 * common issues
 
@@ -120,6 +120,8 @@
   GuixSD is a fully-free GNU/Linux distribution with an advanced
   package manager and system upgrade mechanism
 
+  source code licensed under GPLv3 (*shocker*)
+
 * what is guix?
 
   \begin{center}
@@ -166,17 +168,6 @@
 
   =guix package --roll-back=
 
-* transactional upgrades and rollbacks
-
-  system upgrades are transactional, too!
-
-  =sudo guix system reconfigure my-machine.scm=
-
-  oh no, the latest GuixSD updates broke my system!
-
-  no worries, just reboot and select the previous, working version
-  from the bootloader menu
-
 * a note about binaries
 
   there is *no central point of trust* for receiving
@@ -204,12 +195,6 @@
   \includegraphics[width=11cm]{graph.png}
   \end{center}
 
-* sharing packages
-
-  =guix build -L ~/my-packages foo=
-
-  <minimal package example>
-
 * development environments
 
   =guix environment= is like Python’s virtualenv, Ruby’s rvm, Node’s
@@ -292,6 +277,14 @@
   #+END_SRC
   #+latex: }
 
+* system configurations
+
+  system configuration files *fully describe* the resulting operating
+  system
+
+  since they are just text files, they can be easily backed up, stored
+  in a version control system, and shared with other people
+
 * sharing system configurations
 
   #+latex: \tiny{
@@ -324,6 +317,21 @@
   #+END_SRC
   #+latex: }
 
+* transactional upgrades and rollbacks redux
+
+  system upgrades are transactional, too!
+
+  =sudo guix system reconfigure my-machine.scm=
+
+  oh no, the latest GuixSD updates broke my system!
+
+  \begin{center}
+  \includegraphics[width=4cm]{oh-no.jpg}
+  \end{center}
+
+  no worries, just reboot and select the previous, working version
+  from the bootloader menu
+
 * sharing binaries
 
   start a server to share your builds:
@@ -349,6 +357,9 @@
   reproducible builds produce *bit-identical binaries* when performed
   multiple times under the same conditions.
 
+  when builds are reproducible, we gain the ability to detect when
+  binaries are compromised
+
   requires fixing issues in upstream build systems that are
   nondeterministic.
 
@@ -366,7 +377,7 @@
 
   is this build reproducible on my machine?
 
-  =guix build --rounds=3 hello=
+  =guix build --rounds=3 python=
 
 * challenge authority
 
@@ -376,16 +387,15 @@
 
   #+BEGIN_SRC sh
     guix challenge emacs \
-         --substitute-urls=\
-         "https://mirror.hydra.gnu.org \
-          https://bobs-questionable-binaries.biz"
+         --substitute-urls="https://mirror.hydra.gnu.org \
+           https://bobs-questionable-binaries.biz"
   #+END_SRC
 
 * reasons for mismatched binaries
 
   innocent build nondeterminism:
   - timestamps
-  - hardware differences
+  - hardware-specific optimizations (looking at you, ATLAS)
   - build directories
   - bad parallelism
 
@@ -410,7 +420,7 @@
     guix build ruby --with-source=ruby-2.5.0.tar.gz
   #+END_SRC
 
-* customize packages
+* customize packages in Guix itself
 
   let's make some changes to the source code itself!
 
@@ -424,13 +434,53 @@
     guix build ruby
   #+END_SRC
 
+  now make a patch and send it to us!
+
+* sharing custom packages
+
+  #+latex: \tiny{
+  #+BEGIN_SRC scheme
+    (define-public openfst
+      (let ((commit "58983d37849a24ad80cf908098e2af7c4863941d"))
+        (package
+          (name "openfst")
+          (version (string-append "1.4.1-1." (string-take commit 7)))
+          (source (origin
+                    (method git-fetch)
+                    (uri (git-reference
+                          (url "https://github.com/cobaltspeech/stable-openfst.git")
+                          (commit commit)))
+                    (file-name (string-append name "-" version))
+                    (sha256
+                     (base32
+                      "0yikm03d82j6rpzqkg41yhs91lg4s9k03zhiqx7cndw9xqdsnbg1"))))
+          (build-system gnu-build-system)
+          (arguments
+           '(#:configure-flags '("--with-pic"
+                                 "--enable-shared"
+                                 "--enable-static")))
+          (synopsis "Finite-state transducer library")
+          (description "OpenFst is a library for constructing, combining,
+    optimizing, and searching weighted finite-state
+    transducers (FSTs).")
+          (home-page "https://github.com/cobaltspeech/stable-openfst")
+          (license license:asl2.0))))
+  #+END_SRC
+  #+latex: }
+
+ #+latex: \normalsize{
+ #+BEGIN_SRC sh
+  guix build --load-path=$HOME/my-packages openfst
+ #+END_SRC
+ #+latex: }
+
 * interoperate with other systems
 
   need a Docker image?
 
   =guix pack --format=docker guile emacs geiser=
 
-  \tiny(see /Solving the deployment crisis with GNU Guix/ from
+  (tangent: see /Solving the deployment crisis with GNU Guix/ from
   LibrePlanet 2016 for reasons why Docker may not be so great)
 
 * interoperate with other systems
@@ -479,7 +529,7 @@
   #+END_SRC
   #+latex: }
 
-  hopefully more ARM systems coming soon!
+  \normalsize{hopefully more ARM systems coming soon!}
 
 * extending guix
 
@@ -528,19 +578,28 @@
 
 * the stack
 
-  Core components written in Scheme:
+  core components written in Scheme:
 
   - initial RAM disk
   - init system (GNU Shepherd)
   - package manager
 
+  lots of code reuse and opportunities for extension
+
+* challenges
+
+  - usabliity
+  - the npm problem
+  - self-hosting compilers
+  - cluster deployments
+
 * the freedom to contribute
 
   The GNU Guix project has a welcoming community:
 
-  - we have a *code of conduct*
-  - we have started seeking new contributors via *Outreachy*
-  - we participate in *Google Summer of Code* every year
+  - *code of conduct*
+  - *Outreachy*
+  - *Google Summer of Code*
   - oh, and no copyright assignment (in case you were wondering)
 
   we need your help to bring GuixSD to a wider audience!
@@ -561,3 +620,6 @@
   Licensed under Creative Commons Attribution Share-Alike 4.0
 
   (sans the memes which I use under fair-use)
+
+  GNU run, edit, share, contribute images:
+  https://shop.fsf.org/tshirts-hoodies/4-gnus-4-freedoms-t-shirt
diff --git a/2018-03-25-guix-libreplanet/guix-libreplanet.pdf b/2018-03-25-guix-libreplanet/guix-libreplanet.pdf
index 45741b8..055dcb5 100644
--- a/2018-03-25-guix-libreplanet/guix-libreplanet.pdf
+++ b/2018-03-25-guix-libreplanet/guix-libreplanet.pdf