From c60cc924fff90d82e9340b96ac00b5315e622793 Mon Sep 17 00:00:00 2001
From: Rudolf Polzer <divverent@xonotic.org>
Date: Sat, 28 May 2011 08:35:23 +0200
Subject: [PATCH] get rid of some subshells when finding checksums of a file

---
 misc/tools/cached-converter.sh | 35 ++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/misc/tools/cached-converter.sh b/misc/tools/cached-converter.sh
index 43aa5b2c..104b657d 100755
--- a/misc/tools/cached-converter.sh
+++ b/misc/tools/cached-converter.sh
@@ -39,6 +39,36 @@ tmpdir=`mktemp -d -t cached-converter.XXXXXX`
 trap 'exit 1' INT
 trap 'rm -rf "$tmpdir"' EXIT
 
+
+use_magnet_to_acquire_checksum_faster()
+#             ___________________
+#        ,--'' ~~~~~~~^^^~._     '.
+#    ,.-' ~~~~~~~~~~^^^^^~~~._._   \
+#    |   /^^^^^|    /^^^^^^^^\\ \   \
+#  ,/___  <  o>      <  (OO) > _     \
+# /'/,         |-         .       ----.\
+# |(|-'^^;,-  ,|     __    ^~~^^^^^^^; |\
+# \\`  |    <;_    __ |`---  ..-^^/- | ||
+#  \`-|Oq-.____`________~='^^|__,/  ' //
+#   \ || | |   |  |    \ ..-;|  /    '/
+#   | ||#|#|the|==|game!|'^` |/'    /'
+#   | \\\\^\***|***|    \ ,,;'     /
+#   |  `-=\_\__\___\__..-' ,.- - ,/
+#   | . `-_  ------   _,-'^-'^,-'
+#   | `-._________..--''^,-''^
+#   \             ,...-'^
+#    `----------'^              PROBLEM?
+{
+	magnet=`GIT_DIR="$git_src_repo/.git" git ls-files -s "$1"`
+	if [ -n "$magnet" ]; then
+		magnet=${magnet#* }
+		magnet=${magnet%% *}
+		sum=$sum$magnet
+	else
+		sum=$sum`git hash-object "$1"`
+	fi
+}
+
 lastinfiles=
 lastinfileshash=
 cached()
@@ -70,9 +100,10 @@ cached()
 			esac
 		done
 		if [ -n "$git_src_repo" ] && ! $evil; then
-			sum=`( cd "$git_src_repo"; git ls-files -s "${infile1#./}" | cut -d ' ' -f 2 | grep . ) || { echo >&2 "git-ls-files failed on $infile1"; git hash-object "$infile1"; }`
+			sum=
+			use_magnet_to_acquire_checksum_faster "${infile1#./}"
 			if [ -n "$infile2" ]; then
-				sum=$sum`( cd "$git_src_repo"; git ls-files -s "${infile2#./}" | cut -d ' ' -f 2 | grep . ) || { echo >&2 "git-ls-files failed on $infile2"; git hash-object "$infile2"; }`
+				use_magnet_to_acquire_checksum_faster "${infile2#./}"
 			fi
 		else
 			sum=`git hash-object "$infile1"`
-- 
2.39.2