repo: add --show-toplevel akin to git

Simple API to make it easy to find the top of the repo client checkout
for users.  This mirrors the `git rev-parse --show-toplevel` API.

Change-Id: I0c3f98def089d0fc9ebcfa50aa3dc02091c1c273
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/312909
Reviewed-by: Xin Li <delphij@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/man/repo.1 b/man/repo.1
index 0e85b0b7..4aa76380 100644
--- a/man/repo.1
+++ b/man/repo.1
@@ -34,6 +34,10 @@ time repo command execution
 \fB\-\-version\fR
 display this version of repo
 .TP
+\fB\-\-show\-toplevel\fR
+display the path of the top\-level directory of the
+repo client checkout
+.TP
 \fB\-\-event\-log\fR=\fI\,EVENT_LOG\/\fR
 filename of event log to append timeline to
 .TP