t9300: factor out portable "head -c" replacement

diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index 2bb973655bf043cc43292764ffd68becda25aa2e..43c488b545e6acc02bab9d496e33c37b99f49c7a 100755 (executable)
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -18,7 +18,7 @@ test_expect_success \
      mkdir path1 &&
      echo rezrov >path1/file1 &&
      git update-index --add file0 path1/file1 &&
-     tree=`git write-tree` &&
+     tree=$(git write-tree) &&
      echo "$tree" &&
      echo nitfol >file0 &&
      echo yomin >path1/file1 &&
@@ -56,7 +56,7 @@ test_expect_success \
      compare_diff_raw current expected'
 
 cat >expected <<\EOF
-:100644 100644 766498d93a4b06057a8e49d23f4068f1170ff38f 0a41e115ab61be0328a19b29f18cdcb49338d516 M     file0
+:100644 100644 8e4020bb5a8d8c873b25de15933e75cc0fc275df dca6b92303befc93086aa025d90a5facd7eb2812 M     file0
 EOF
 test_expect_success \
     'limit to file0 should show file0' \
@@ -131,7 +131,7 @@ test_expect_success 'diff multiple wildcard pathspecs' '
        mkdir path2 &&
        echo rezrov >path2/file1 &&
        git update-index --add path2/file1 &&
-       tree3=`git write-tree` &&
+       tree3=$(git write-tree) &&
        git diff --name-only $tree $tree3 -- "path2*1" "path1*1" >actual &&
        cat <<-\EOF >expect &&
        path1/file1