[PATCH v2 1/1] git-gui: protect rev-parse --show-toplevel call

[Shroom Moo <egg_mushroomcow@foxmail.com>]

When starting git-gui from a directory that is a bare repository or
where the working tree is missing, git-gui previously executed
'rev-parse --show-toplevel' without error handling. This caused a
fatal Tcl error ("this operation must be run in a work tree").

Wrap the call in a catch to prevent the fatal error. The existing
error paths after this call already handle bare repos and missing
worktrees appropriately.

Signed-off-by: Shroom Moo <egg_mushroomcow@foxmail.com>
---
 git-gui/git-gui.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 23fe76e498..aee37685e1 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -1169,7 +1169,9 @@ if {![file isdirectory $_gitdir]} {
 load_config 0
 apply_config
 
-set _gitworktree [git rev-parse --show-toplevel]
+if {[catch {set _gitworktree [git rev-parse --show-toplevel]}]} {
+    set _gitworktree {}
+}
 
 if {$_prefix ne {}} {
 	if {$_gitworktree eq {}} {
-- 
2.52.0.windows.1