[gentoo-python] [PATCH 2/2] Replace 'head -n 1' calls with 'read' built-in.

["Michał Górny" <mgorny@gentoo.org>]

The read built-in is simpler than forking and using pipes to relay
the first line of the file.
---
 gx86/eclass/distutils-r1.eclass    | 6 ++++--
 gx86/eclass/python-utils-r1.eclass | 4 ++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/gx86/eclass/distutils-r1.eclass b/gx86/eclass/distutils-r1.eclass
index 991d0a1..dd19440 100644
--- a/gx86/eclass/distutils-r1.eclass
+++ b/gx86/eclass/distutils-r1.eclass
@@ -394,9 +394,11 @@ _distutils-r1_rename_scripts() {
 	while IFS= read -r -d '' f; do
 		debug-print "${FUNCNAME}: found executable at ${f#${D}/}"
 
-		if [[ "$(head -n 1 "${f}")" == '#!'*${EPYTHON}* ]]
+		local shebang
+		read -r shebang < "${f}"
+		if [[ ${shebang} == '#!'*${EPYTHON}* ]]
 		then
-			debug-print "${FUNCNAME}: matching shebang: $(head -n 1 "${f}")"
+			debug-print "${FUNCNAME}: matching shebang: ${shebang}"
 
 			local newf=${f}-${EPYTHON}
 			debug-print "${FUNCNAME}: renaming to ${newf#${D}/}"
diff --git a/gx86/eclass/python-utils-r1.eclass b/gx86/eclass/python-utils-r1.eclass
index 1ab8366..cd229f3 100644
--- a/gx86/eclass/python-utils-r1.eclass
+++ b/gx86/eclass/python-utils-r1.eclass
@@ -493,8 +493,8 @@ _python_rewrite_shebang() {
 
 	local f
 	for f; do
-		local shebang=$(head -n 1 "${f}")
-		local from
+		local from shebang
+		read -r shebang < "${f}"
 		shebang=${shebang%$'\r'}
 		debug-print "${FUNCNAME}: path = ${f}"
 		debug-print "${FUNCNAME}: shebang = ${shebang}"
-- 
1.8.1.5