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+#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
+#+INCLUDE: "prelude.org" :minlevel 1
+
+* VCS history
+ :PROPERTIES:
+ :CUSTOM_ID: main
+ :END:
+** Evolution of software development
+ :PROPERTIES:
+ :CUSTOM_ID: timeline
+ :END:
+*** Version control system (VCS)
+ - records changes made to a (set of) /source code file/ (s)
+ - allows to operate on versions: diff/merge/fork/recover etc.
+ - *essential* tool for software development
+ #+BEAMER: \pause
+*** Three decades of evolution
+#+LATEX: \centering
+#+LATEX: \includegraphics[width=.8\linewidth]{VCS_history_timeline.png}
+
+** In a picture \hfill (from https://github.com/progit/progit2)
+ :PROPERTIES:
+ :CUSTOM_ID: vcs-explained
+ :END:
+ #+BEGIN_EXPORT latex
+ \centering\forcebeamerstart
+ \only<1>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{localvcs}}\mbox{}\\[2em]
+ \texttt{co -r1.2 file.c}
+ }
+ \only<2>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{centralisedvcs}}\mbox{}\\[2em]
+ \texttt{cvs co -r Rel-1A ProgABC}
+ }
+ \only<3>{\colorbox{white}{\includegraphics[width=\extblockscale{.5\linewidth}]{distvcs}}\mbox{}\\[2em]
+ \texttt{git checkout df3b1b08f756569eff0919e37d8af1f403515b31}
+ }
+ \forcebeamerend
+ #+END_EXPORT
+** Foundations of modern DVCS
+ :PROPERTIES:
+ :CUSTOM_ID: dvcs-to-merkle
+ :END:
+**** Requirements for the D in DVCS
+ - *intrinsic* unique identifiers... \hfill (here: /cryptographic signature/, aka "hash")
+ - ... that work for *tree structures* (software directories)
+ #+BEAMER: \pause
+ # R. C. Merkle, A digital signature based on a conventional encryption
+ # function, Crypto '87
+**** Merkle tree to the rescue (R. C. Merkle, Crypto 1979) :B_picblock:
+ :PROPERTIES:
+ :BEAMER_opt: pic=merkle, leftpic=true, width=.7\linewidth
+ :BEAMER_env: picblock
+ :BEAMER_act:
+ :END:
+ Combination of
+ - tree
+ - hash function
+** A massive adoption
+ :PROPERTIES:
+ :CUSTOM_ID: adoption
+ :END:
+*** Stack Overflow \hfill \href{https://insights.stackoverflow.com/survey/2018}{[Survey 2018]}
+ :PROPERTIES:
+ :BEAMER_col: 0.47
+ :BEAMER_env: block
+ :END:
+ #+latex: \centering
+ #+ATTR_LATEX: :width \extblockscale{1.4\linewidth}
+ file:stackoverflow-survey-VCS.png
+
+ #+BEAMER: \pause
+*** In numbers
+ :PROPERTIES:
+ :BEAMER_col: 0.45
+ :BEAMER_env: block
+ :END:
+ GitHub \hfill \href{https://octoverse.github.com/2017/}{[Octoverse 2017]} \href{https://github.blog/2018-11-08-100m-repos/}{[Blog 2018]}
+ - *100.000.000+* repositories
+ - *40.000.000+* developers worldwide
+
+ Bitbucket \hfill \href{https://bitbucket.org/blog/celebrating-10-million-bitbucket-cloud-registered-users}{[Blog 2019]}
+ - *28.000.000+* repositories
+ - *10.000.000+* developers worldwide
+
+ GitLab \hfill \href{https://about.gitlab.com/blog/2019/06/06/1-mil-merge-requests/}{[Blog 2019]}
+ - *1.000.000* MRs March 19'
+ #+BEAMER: \pause
+
+***
+ \hfill Let's use it!
+

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