t/t7103-reset-bare.sh: use the $( ... ) construct for command substitution

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index cefd1452c66663fee9b00d1406b1d4f14e7964ac..98f1779cf3241fa12300fbf3dc0c4eff8ab10b61 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -306,6 +306,15 @@ then
        start_timestamp=$(date '+%s')
 fi
 
+if test -n "$filter_index" ||
+   test -n "$filter_tree" ||
+   test -n "$filter_subdir"
+then
+       need_index=t
+else
+       need_index=
+fi
+
 while read commit parents; do
        git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
 
@@ -313,7 +322,10 @@ while read commit parents; do
 
        case "$filter_subdir" in
        "")
-               GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
+               if test -n "$need_index"
+               then
+                       GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
+               fi
                ;;
        *)
                # The commit may not have the subdirectory at all
@@ -387,8 +399,15 @@ while read commit parents; do
        } <../commit |
                eval "$filter_msg" > ../message ||
                        die "msg filter failed: $filter_msg"
+
+       if test -n "$need_index"
+       then
+               tree=$(git write-tree)
+       else
+               tree="$commit^{tree}"
+       fi
        workdir=$workdir @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
-               $(git write-tree) $parentstr < ../message > ../map/$commit ||
+               "$tree" $parentstr < ../message > ../map/$commit ||
                        die "could not write rewritten commit"
 done <../revs