Force pushing to subtree remotes can occasionally be a useful workflow,
particularly when the remote uses a workflow like GitHub pull requests.

Signed-off-by: Joshua Watt <[email protected]>
---
 contrib/subtree/git-subtree.sh  | 14 +++++++++++++-
 contrib/subtree/git-subtree.txt |  9 +++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 147201dc6c..39792198b4 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -29,6 +29,8 @@ onto=         try connecting new tree to an existing one
 rejoin        merge the new branch back into HEAD
  options for 'add', 'merge', and 'pull'
 squash        merge subtree changes as a single commit
+ options for 'push'
+f,force       force push
 "
 eval "$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
 
@@ -48,6 +50,7 @@ annotate=
 squash=
 message=
 prefix=
+force=
 
 debug () {
        if test -n "$debug"
@@ -137,6 +140,9 @@ do
        --no-squash)
                squash=
                ;;
+       -f)
+               force=1
+               ;;
        --)
                break
                ;;
@@ -892,7 +898,13 @@ cmd_push () {
                refspec=$2
                echo "git push using: " "$repository" "$refspec"
                localrev=$(git subtree split --prefix="$prefix") || die
-               git push "$repository" "$localrev":"refs/heads/$refspec"
+               if test -n "$force"
+               then
+                       fopt="--force"
+               else
+                       fopt=""
+               fi
+               git push $fopt "$repository" "$localrev":"refs/heads/$refspec"
        else
                die "'$dir' must already exist. Try 'git subtree add'."
        fi
diff --git a/contrib/subtree/git-subtree.txt b/contrib/subtree/git-subtree.txt
index 352deda69d..e956e6ab7d 100644
--- a/contrib/subtree/git-subtree.txt
+++ b/contrib/subtree/git-subtree.txt
@@ -175,6 +175,15 @@ remain intact and can be later split and send upstream to 
the
 subproject.
 
 
+OPTIONS FOR push
+----------------
+-f::
+--force::
+       This option is only valid for the push command
++
+Force push to the remote branch, just like gitlink:git-push[1]
+
+
 OPTIONS FOR split
 -----------------
 --annotate=<annotation>::
-- 
2.20.1

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