git-gui: Change prior tree SHA-1 verification to use git_read

diff --git a/lib/commit.tcl b/lib/commit.tcl
index 3172d7cb60b87cfb5d681d511fe9c5442749793c..46a78c158f53372a481061e9a5a6072c40e54e58 100644 (file)
--- a/lib/commit.tcl
+++ b/lib/commit.tcl
@@ -258,7 +258,7 @@ proc commit_committree {fd_wt curHEAD msg} {
        # -- Verify this wasn't an empty change.
        #
        if {$commit_type eq {normal}} {
-               set fd_ot [open "| git cat-file commit $PARENT" r]
+               set fd_ot [git_read cat-file commit $PARENT]
                fconfigure $fd_ot -encoding binary -translation lf
                set old_tree [gets $fd_ot]
                close $fd_ot