[bug#41637] gnu: Add hashcash.

On Wed, Jun 03, 2020 at 08:55:39AM +0200, Mathieu Othacehe wrote:
> 
> Hey Jakub,
> 
> Thanks for fixing the cross-compilation, a full review this time :)
> 
> > +             (let* ((outdir (assoc-ref outputs "out"))
> > +                    (bindir (string-append outdir "/bin"))
> > +                    (mandir (string-append outdir "/share/man/man1"))
> > +                    (docdir (string-append outdir "/share/doc/hashcash-" ,version)))
> > +               ;; make install assumes /usr and doesn't provide a way to override it
> > +               (install-file "hashcash" bindir)
> > +               (install-file "hashcash.1" mandir)
> > +               (install-file "README" docdir)
> > +               (install-file "LICENSE" docdir)
> > +               (install-file "CHANGELOG" docdir)
> 
> I think you can set the variables INSTALL_PATH, MAN_INSTALL_PATH and
> DOC_INSTALL_PATH instead.
> 
> > +               #t))))))
> > +    (home-page "https://www.hashcash.org/")
> > +    (synopsis "Denial-of-service countermeasure")
> > +    (description "Hashcash is a proof-of-work algorithm, which has been used
> > +as a denial-of-service countermeasure technique in a number of systems.
> 
> You can remove "in a number of systems".

Note that systems means things like e-mail or bitcoin, rather than Guix
or Debian.

> > +A hashcash stamp constitutes a proof-of-work which takes a parametrizable
> > +amount of work to compute for the sender.  The recipient can verify received
> > +hashcash stamps efficiently.
> > +
> > +This package contains a command-line tool for computing and verifying hashcash
> > +stamps.")
> > +    (license license:public-domain)))
> 
> I'm also concerned by this line in the Makefile:
> 
> --8<---------------cut here---------------start------------->8---
> # request static link of -lcrypto only
> LIBCRYPTO=/usr/lib/libcrypto.a
> --8<---------------cut here---------------end--------------->8---
> 
> We should maybe add "openssl" to the inputs and fix this variable
> (that's what Nix does).

Firstly, the benchmarking code seems to be broken in Hashcash 1.22.
Downgrading to 1.21 and running hashcash -sv, I found that OpenSSL
is slower than another minting backend, and is not used by default.
I believe it would be better to not include OpenSSL in the package.
That's what Debian does, anyway.

I therefore propose only the following changes:


Regards,
Jakub Kądziołka
From de679e91b17b3a04a5f07446d0b121ed8f5890ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20K=C4=85dzio=C5=82ka?= <kuba@kadziolka.net>
Date: Mon, 1 Jun 2020 02:37:03 +0200
Subject: [PATCH v2] gnu: Add hashcash.

* gnu/packages/networking.scm (hashcash): New variable.
---
 gnu/packages/networking.scm | 47 +++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/gnu/packages/networking.scm b/gnu/packages/networking.scm
index fd29370841..d7de5b1956 100644
--- a/gnu/packages/networking.scm
+++ b/gnu/packages/networking.scm
@@ -38,6 +38,7 @@
 ;;; Copyright © 2019 Diego N. Barbato <dnbarbato@posteo.de>
 ;;; Copyright © 2020 Vincent Legoll <vincent.legoll@gmail.com>
 ;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
+;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -3189,3 +3190,49 @@ CDP.  The goal of LLDP is to provide an inter-vendor compatible mechanism to
 deliver Link-Layer notifications to adjacent network devices.  @code{lldpd} is
 an implementation of LLDP.  It also supports some proprietary protocols.")
     (license license:isc)))
+
+(define-public hashcash
+  (package
+    (name "hashcash")
+    (version "1.22")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "http://www.hashcash.org/source/hashcash-"
+                           version ".tgz"))
+       (sha256
+        (base32
+         "15kqaimwb2y8wvzpn73021bvay9mz1gqqfc40gk4hj6f84nz34h1"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:make-flags (list (string-append "CC=" ,(cc-for-target)))
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         ;; No tests available.
+         (delete 'check)
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((outdir (assoc-ref outputs "out"))
+                    (bindir (string-append outdir "/bin"))
+                    (mandir (string-append outdir "/share/man/man1"))
+                    (docdir (string-append outdir "/share/doc/hashcash-" ,version)))
+               ;; Install manually, as we don't need the `sha1' binary
+               (install-file "hashcash" bindir)
+               (install-file "hashcash.1" mandir)
+               (install-file "README" docdir)
+               (install-file "LICENSE" docdir)
+               (install-file "CHANGELOG" docdir)
+               #t))))))
+    (home-page "https://www.hashcash.org/")
+    (synopsis "Denial-of-service countermeasure")
+    (description "Hashcash is a proof-of-work algorithm, which has been used
+as a denial-of-service countermeasure technique in a number of systems.
+
+A hashcash stamp constitutes a proof-of-work which takes a parametrizable
+amount of work to compute for the sender.  The recipient can verify received
+hashcash stamps efficiently.
+
+This package contains a command-line tool for computing and verifying hashcash
+stamps.")
+    (license license:public-domain)))