Subject: Re: [bug#44736] [Shepherd PATCH] build: Add guix.scm helper file.

From: Efraim Flashner <[email-masked]>
Date: Thu, 21 Jan 2021 12:13:13 +0200

On Mon, Jan 11, 2021 at 01:36:38PM +0100, Ludovic Courtès wrote:
> Hello!
> 
> Efraim Flashner <[email-masked]> skribis:
> 
> > * build-aux/guix.scm: New file.
> 
> Could you (1) add a copyright header, and (2) add this file to
> ‘EXTRA_DIST’ in ‘Makefile.am’?

Sure

> > +(define (keep-file? file stat)
> > +  (not (any (lambda (my-string)
> > +              (string-contains file my-string))
> > +            (list ".git" ".dir-locals.el" "build-aux"))))
> 
> FWIW, I’m never quite sure what to do here.  In Guile-zstd, I wrote
> something that works even from a tarball (not a Git checkout), but it’s
> a bit verbose:
> 
>   https://notabug.org/guile-zstd/guile-zstd/src/master/guix.scm

Looking at that list I feel like I'm missing bits. If we go down the
rabiit hole of figuring out all the different files which could possibly
be included in the list I feel like we should keep it as a fancy macro
somewhere. It'd almost be easier to copy the entire directory somewhere,
run 'git clean -dfx' and then use that. Or to parse .gitignore or make
clean.

> > +(define (build-from-git base)
> > +  (package
> > +    (inherit base)
> > +    (version (git-version (package-version base) "HEAD" %git-commit))
> > +    (source (local-file %source-dir
> > +                        #:recursive? #t
> > +                        #:select? keep-file?))
> 
> […]
> 
> > +(list (build-from-git (specification->package "shepherd"))
> > +      (build-from-git (specification->package "guile2.2-shepherd"))
> > +      ;; This version FTBFS due to an import of '(ice-9 threads)' in modules/shepherd.scm
> > +      ;(build-from-git (specification->package "guile2.0-shepherd"))
> > +      )
> 
> Should it be a manifest instead, so that ‘guix build -f’ works?

Returning a list also seems to work

(ins)efraim@3900XT ~/workspace/shepherd$ guix build -f build-aux/guix.scm -n
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bayfront.guix.gnu.org'... 100.0%
The following derivations would be built:
   /gnu/store/g2ql360i3s02mg42l4ys27lsghpx5xqq-shepherd-0.8.1-HEAD.b482009.drv
   /gnu/store/ajlqc21qqmi3fp5j30jq7vc0i1qn701y-guile2.2-shepherd-0.8.1-HEAD.b482009.drv
   /gnu/store/nbq7yw0zzmrwvykcld3fsbgmh39fapym-guile2.0-shepherd-0.8.1.drv

> The downside of returning several packages is that ‘guix environment -l
> guix.scm’ won’t work.

Technically it works, but it's not as useful as just getting the inputs
you actually want.

(ins)efraim@3900XT ~/workspace/shepherd$ guix environment -l build-aux/guix.scm
(ins)efraim@3900XT ~/workspace/shepherd [env]$ which -a guile
/gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/bin/guile
/home/efraim/.guix-profile/bin/guile
/run/current-system/profile/bin/guile
(ins)efraim@3900XT ~/workspace/shepherd [env]$ /gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/bin/guile --version
guile (GNU Guile) 3.0.2
Copyright (C) 2020 Free Software Foundation, Inc.

License LGPLv3+: GNU LGPL 3 or later <http://gnu.org/licenses/lgpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
(ins)efraim@3900XT ~/workspace/shepherd$ ls /gnu/store/xlsi9fmi4blrpwn4xy8cvfq86zhag878-profile/lib/guile/
2.0  2.2  3.0/

> Thanks,
> Ludo’.

I also got guile2.0-shepherd to build.

-- 
Efraim Flashner   <[email-masked]>   אפרים פלשנר
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From 3fe742290f24fa5e514a06c73247537aed3e58a4 Mon Sep 17 00:00:00 2001
From: Efraim Flashner <[email-masked]>
Date: Thu, 19 Nov 2020 14:51:28 +0200
Subject: [PATCH] build: Add guix.scm helper file.

* build-aux/guix.scm: New file.
* Makefile.am (EXTRA_DIST): Register it.
---
 Makefile.am        |  2 +-
 build-aux/guix.scm | 79 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 build-aux/guix.scm

diff --git a/Makefile.am b/Makefile.am
index 774ebba..1c4acda 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -71,7 +71,7 @@ CLEANFILES =						\
 
 # Crash handler.
 
-EXTRA_DIST = etc/crash-handler.c
+EXTRA_DIST = etc/crash-handler.c build-aux/guix.scm
 
 if BUILD_CRASH_HANDLER
 
diff --git a/build-aux/guix.scm b/build-aux/guix.scm
new file mode 100644
index 0000000..d895db4
--- /dev/null
+++ b/build-aux/guix.scm
@@ -0,0 +1,79 @@
+;;; guix.scm -- Guix package definition
+;; Copyright (C) 2020 Efraim Flashner <[email-masked]>
+;;
+;; This file is part of the GNU Shepherd.
+;;
+;; The GNU Shepherd is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or (at
+;; your option) any later version.
+;;
+;; The GNU Shepherd is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with the GNU Shepherd.  If not, see <http://www.gnu.org/licenses/>.
+
+(use-modules
+  (guix packages)
+  ((guix git-download) #:select (git-version))
+  ((guix build utils) #:select (find-files))
+  ((guix gexp) #:select (local-file))
+  ((guix utils) #:select (substitute-keyword-arguments))
+  ((gnu packages) #:select (specification->package))
+  ((ice-9 popen) #:select (open-pipe))
+  ((ice-9 rdelim) #:select (read-string))
+  ((srfi srfi-1) #:select (any)))
+
+(define %source-dir (dirname (dirname (current-filename))))
+
+(define %git-commit
+  (read-string (open-pipe "git show HEAD | head -1 | cut -d ' ' -f 2" OPEN_READ)))
+
+(define (keep-file? file stat)
+  (not (any (lambda (my-string)
+              (string-contains file my-string))
+            (list ".git" ".dir-locals.el" "build-aux"))))
+
+(define (build-from-git base)
+  (package
+    (inherit base)
+    (version (git-version (package-version base) "HEAD" %git-commit))
+    (source (local-file %source-dir
+                        #:recursive? #t
+                        #:select? keep-file?))
+    (native-inputs
+     `(("autoconf" ,(specification->package "autoconf"))
+       ("automake" ,(specification->package "automake"))
+       ("gettext" ,(specification->package "gettext"))
+       ("help2man" ,(specification->package "help2man"))
+       ("texinfo" ,(specification->package "texinfo"))
+       ,@(package-native-inputs base)))
+    (arguments
+     `(#:configure-flags '("--localstatedir=/var")
+       #:make-flags (list "GUILE_AUTO_COMPILE=0")
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'make-po-directory-writable
+           (lambda _
+             (for-each make-file-writable
+               (find-files "po"))
+               #t)))))))
+
+(list (build-from-git (specification->package "shepherd"))
+      (build-from-git (specification->package "guile2.2-shepherd"))
+      (let ((base (build-from-git (specification->package "guile2.0-shepherd"))))
+        (package
+          (inherit base)
+          (arguments
+           (substitute-keyword-arguments (package-arguments base)
+             ((#:phases phases)
+              `(modify-phases ,phases
+                 (add-after 'unpack 'patch-source
+                   (lambda _
+                     ;; (ice-9 threads) isn't available in guile-2.0
+                     (substitute* "modules/shepherd.scm"
+                       ((".*\\(ice-9 threads\\).*") ""))
+                     #t)))))))))
-- 
2.30.0