From fa6cb85db5e531f60b04f3b14e6a40c3487c5d8b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mislav=20Marohni=C4=87?= <git@mislav.net>
Date: Fri, 16 Jul 2021 17:26:30 +0200
Subject: [PATCH] Tweak `script/mirror`

---
 script/mirror | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/script/mirror b/script/mirror
index 65f5419a..03155c73 100755
--- a/script/mirror
+++ b/script/mirror
@@ -15,8 +15,9 @@ test_mirrored() {
 }
 
 compute_sha2() {
-  local output="$(openssl dgst -sha256)"
-  echo "${output##* }" | tr '[A-Z]' '[a-z]'
+  local output
+  output="$(openssl dgst -sha256)"
+  tr '[:upper:]' '[:lower:]' <<<"${output##* }"
 }
 
 download_package() {
@@ -41,12 +42,15 @@ changed_files() {
 }
 
 potentially_new_packages() {
-  local files="$(changed_files "$1" -- ./share/ruby-build)"
-  [ -n "$files" ] && extract_urls $files
+  local head="${1#*..}"
+  local files
+  IFS=$'\n' read -d '' -r -a files < <(changed_files "$1" -- ./share/ruby-build)
+  [ ${#files[@]} -gt 0 ] || return 0
+  extract_urls "${head:-HEAD}" -- "${files[@]}"
 }
 
 extract_urls() {
-  $(type -p ggrep grep | head -1) -hoe 'http[^"]\+#[^"]\+' "$@" | sort | uniq
+  git grep -hoe 'http[^"]\+#[^"]\+' "$@" | sort | uniq
 }
 
 update() {
@@ -88,7 +92,8 @@ verify() {
 }
 
 stats() {
-  local packages=( $(extract_urls ./share/ruby-build/*) )
+  local packages
+  IFS=$'\n' read -d '' -r -a packages < <(extract_urls -- ./share/ruby-build/\*)
   local total="${#packages[@]}"
   local confirmed=0
   local checksum