From 9c49049c9e5eca1139081f8d61976f758ea18a00 Mon Sep 17 00:00:00 2001
From: Anders Kaseorg <anders@zulipchat.com>
Date: Sat, 24 Aug 2019 18:40:10 -0700
Subject: [PATCH] update-locked-requirements: Use pip-compile --no-header.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
---
 tools/update-locked-requirements | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/update-locked-requirements b/tools/update-locked-requirements
index b0ad5a7905..2bf4034db0 100755
--- a/tools/update-locked-requirements
+++ b/tools/update-locked-requirements
@@ -12,7 +12,7 @@ compile_requirements () {
     output="$2"
     python_version="$3"
 
-    pip-compile --quiet --output-file "$output" "$source"
+    pip-compile --quiet --no-header --output-file "$output" "$source"
 
     if [ "$python_version" != "py2" ]; then
         # Remove an unnecessary future requirement declared by commonmark,
@@ -23,8 +23,7 @@ compile_requirements () {
         sed -i 's/^future==/# &/' "$output"
     fi
 
-    (
-        cat <<EOF
+    cat - "$output" <<EOF | sponge "$output"
 #
 # This file is GENERATED.  Don't edit directly.
 #
@@ -35,9 +34,6 @@ compile_requirements () {
 # For details, see requirements/README.md .
 #
 EOF
-        # This perl invocation strips the existing block of header comments.
-        perl -0pe 's/\A(^#.*\n)*//m' "$output"
-    ) | sponge "$output"
 
     # Work around https://github.com/jazzband/pip-tools/issues/268
     chmod a+r "$output"