gnu: Add fpm.

* gnu/packages/package-management.scm (fpm): New variable.
* gnu/packages/patches/fpm-newer-clamp-fix.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

1 files changed, 33 insertions, 0 deletions

diff --git a/gnu/packages/patches/fpm-newer-clamp-fix.patch b/gnu/packages/patches/fpm-newer-clamp-fix.patch
new file mode 100644
index 0000000000..9fbb15ee29
--- /dev/null
+++ b/gnu/packages/patches/fpm-newer-clamp-fix.patch
@@ -0,0 +1,33 @@
+Retrieved from: https://github.com/jordansissel/fpm/pull/1561.patch
+
+From 956a218a7b35de08ea35da3b702ffdc716656b68 Mon Sep 17 00:00:00 2001
+From: Jordan Sissel <jls@semicomplete.com>
+Date: Mon, 15 Oct 2018 21:05:47 -0700
+Subject: [PATCH] Check if an option has a default value before we try to look
+ it up.
+
+This fixes fpm when used with clamp 1.3.0 or above.
+
+Fixes #1543
+---
+ lib/fpm/command.rb | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/lib/fpm/command.rb b/lib/fpm/command.rb
+index a204001e1..a99ddb627 100644
+--- a/lib/fpm/command.rb
++++ b/lib/fpm/command.rb
+@@ -394,7 +394,12 @@ def execute
+     set = proc do |object, attribute|
+       # if the package's attribute is currently nil *or* the flag setting for this
+       # attribute is non-default, use the value.
+-      if object.send(attribute).nil? || send(attribute) != send("default_#{attribute}")
++
++      # Not all options have a default value, so we assume `nil` if there's no default. (#1543)
++      # In clamp >= 1.3.0, options without `:default => ..` will not have any # `default_xyz` 
++      # methods generated, so we need to check for the presence of this method first.
++      default = respond_to?("default_#{attribute}") ? send("default_#{attribute}") : nil
++      if object.send(attribute).nil? || send(attribute) != default
+         logger.info("Setting from flags: #{attribute}=#{send(attribute)}")
+         object.send("#{attribute}=", send(attribute))
+       end