From 3cf9beab238c015964bb1c8193d9a4394fce3a21 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyfox@gentoo.org>
Date: Sun, 23 Apr 2017 22:39:02 +0100
Subject: dev-lang/crystal: Workaround tty corruption in crystal, bug #616256

Patch restores blocking mode of file desriptors in exchange
of potential runtime deadlocks when dealing with stdio.

As it's a potentially invasive patch it's not enabled by default
and is available only under USE=blocking-stdio-hack

Reported-by: Renich Bon Ciric
Bug: https://github.com/crystal-lang/crystal/issues/2065
Bug: https://bugs.gentoo.org/616256
Package-Manager: Portage-2.3.5, Repoman-2.3.2
---
 dev-lang/crystal/crystal-0.22.0.ebuild               |  8 +++++++-
 .../files/crystal-0.22.0-blocking-stdio-hack.patch   | 20 ++++++++++++++++++++
 dev-lang/crystal/metadata.xml                        |  3 +++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 dev-lang/crystal/files/crystal-0.22.0-blocking-stdio-hack.patch

diff --git a/dev-lang/crystal/crystal-0.22.0.ebuild b/dev-lang/crystal/crystal-0.22.0.ebuild
index 91cd89b0f5af..219789c6b1cd 100644
--- a/dev-lang/crystal/crystal-0.22.0.ebuild
+++ b/dev-lang/crystal/crystal-0.22.0.ebuild
@@ -18,7 +18,7 @@ SRC_URI="https://github.com/crystal-lang/crystal/archive/${PV}.tar.gz -> ${P}.ta
 LICENSE="Apache-2.0"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="doc debug examples +xml +yaml"
+IUSE="doc debug examples blocking-stdio-hack +xml +yaml"
 
 # dev-libs/boehm-gc[static-libs] dependency problem,  check the issue: https://github.com/manastech/crystal/issues/1382
 DEPEND="
@@ -41,6 +41,12 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-0.20.5-LDFLAGS.patch
 )
 
+src_prepare() {
+	default
+
+	use blocking-stdio-hack && eapply "${FILESDIR}"/"${PN}"-0.22.0-blocking-stdio-hack.patch
+}
+
 src_compile() {
 	emake \
 		$(usex debug "" release=1) \
diff --git a/dev-lang/crystal/files/crystal-0.22.0-blocking-stdio-hack.patch b/dev-lang/crystal/files/crystal-0.22.0-blocking-stdio-hack.patch
new file mode 100644
index 000000000000..07b7dba7be65
--- /dev/null
+++ b/dev-lang/crystal/files/crystal-0.22.0-blocking-stdio-hack.patch
@@ -0,0 +1,20 @@
+Workaround tty corruption in crystal.
+
+Patch restores blocking mode of file desriptors
+in exchange of potential runtime deadlocks
+when dealing with stdio.
+
+Reported-by: Renich Bon Ciric
+Bug: https://github.com/crystal-lang/crystal/issues/2065
+Bug: https://bugs.gentoo.org/616256
+diff --git a/src/compiler/crystal/stdio.cr b/src/compiler/crystal/stdio.cr
+new file mode 100644
+index 000000000..e65f65089
+--- /dev/null
++++ b/src/compiler/crystal/stdio.cr
+@@ -0,0 +1,5 @@
++module Crystal
++  STDIN.blocking = true
++  STDOUT.blocking=true
++  STDERR.blocking = true
++end
diff --git a/dev-lang/crystal/metadata.xml b/dev-lang/crystal/metadata.xml
index 80b55be2293e..8c0dacece652 100644
--- a/dev-lang/crystal/metadata.xml
+++ b/dev-lang/crystal/metadata.xml
@@ -22,6 +22,9 @@
 		<flag name="debug">
 			Build each module as a separate object file. Speeds build up.
 		</flag>
+		<flag name="blocking-stdio-hack">
+			Keep STDIO file descriptors in blocking mode.
+		</flag>
 		<flag name="yaml">
 			Use the <pkg>dev-libs/libyaml</pkg> library to enable Crystal yaml
 			module
-- 
cgit v1.2.3-65-gdbad