git-gui: Brown paper bag "dirty git version fix"

diff --git a/lib/commit.tcl b/lib/commit.tcl
index dc7c88c6017bcb390c599f8b904ad3e7c31cc7d2..46a78c158f53372a481061e9a5a6072c40e54e58 100644 (file)
--- a/lib/commit.tcl
+++ b/lib/commit.tcl
@@ -258,7 +258,18 @@ proc commit_committree {fd_wt curHEAD msg} {
        # -- Verify this wasn't an empty change.
        #
        if {$commit_type eq {normal}} {
-               set old_tree [git rev-parse "$PARENT^{tree}"]
+               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
+
+               if {[string equal -length 5 {tree } $old_tree]
+                       && [string length $old_tree] == 45} {
+                       set old_tree [string range $old_tree 5 end]
+               } else {
+                       error "Commit $PARENT appears to be corrupt"
+               }
+
                if {$tree_id eq $old_tree} {
                        info_popup {No changes to commit.