Until now, `git submodule summary` was always emitting 7-character
SHA-1s that have a higher chance of being ambiguous for larger
repositories.  Use `git rev-parse --short` instead, which will
determine suitable short SHA-1 lengths.

Signed-off-by: Sven van Haastregt <sve...@gmail.com>
---
 git-submodule.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 5e608f8bad..a422b0728d 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -850,8 +850,8 @@ cmd_summary() {
                        ;;
                esac
 
-               sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
-               sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
+               sha1_abbr_src=$(GIT_DIR="$name/.git" git rev-parse --short 
$sha1_src)
+               sha1_abbr_dst=$(GIT_DIR="$name/.git" git rev-parse --short 
$sha1_dst)
                if test $status = T
                then
                        blob="$(gettext "blob")"
-- 
2.20.1.dirty

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