push to skip nested subrepos (as mentioned in Issue #553)

lib/git-subrepo

@@ -812,6 +812,20 @@ subrepo:branch() {
       "$subref" "$branch"
   fi
 
+  # Mechanism to skip subdirs containing subrepos during a push.
+  # TODO: 1) mention dependency on 'find'; 2) may be turned on/off on option.
+  if which find > /dev/null; then
+    o "Checking $subdir for nested subdirs to avoid"
+    local subdirs
+    mapfile -t subdirs < <(cd -- "$subdir"; find -mindepth 1 -type d -exec 'test' '-f' '{}/.gitrepo' ';' -print)
+    if [[ ${#subdirs[@]} -gt 0 ]]; then
+      for d in "${subdirs[@]}"; do
+        o "Found $d: will rebase to exclude it";
+        git filter-branch -f --index-filter "git rm -r --cached --ignore-unmatch \"${d}\"" "$branch" || true
+      done
+    fi
+  fi
+
   o "Remove the .gitrepo file from $first_gitrepo_commit..$branch"
   local filter=$branch
   [[ $first_gitrepo_commit ]] && filter=$first_gitrepo_commit..$branch

test/push-nested.t

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+
+set -e
+
+source test/setup
+
+nested_fix=1
+
+use Test::More
+
+clone-foo-and-bar
+
+# Add subrepo twice; of which one nested in a subrepo subdir (it's bar but could be any other)
+(
+  # In the main repo:
+  cd "$OWNER/foo"
+
+  # Clone a subrepo into a subdir
+  git subrepo clone "$UPSTREAM/bar"
+
+  # Clone another subrepo into a nested subdir (here it's bar -- no e.g. baz in current fixture)
+  git subrepo clone "$UPSTREAM/bar" "bar/bar"
+
+  # Make a commit in a subrepo:
+  add-new-files bar/FooBar
+
+  # Make a commit in a subrepo nested in a subrepo:
+  add-new-files bar/bar/FooBaz
+) &> /dev/null || die
+
+# Do the subrepo push to another branch:
+{
+  message=$(
+    cd "$OWNER/foo"
+    git subrepo push bar/bar --branch newbar
+    git subrepo pull bar --branch newbar # FooBaz
+  )
+
+  message=$(
+    cd "$OWNER/foo"
+    git subrepo push bar --branch newbar # FooBar only or bar/FooBaz, too ?
+  )
+
+  # Test the output:
+  is "$message" \
+    "Subrepo 'bar' pushed to '$UPSTREAM/bar' (newbar)." \
+    'First push message is correct '
+}
+
+# Pull the changes from UPSTREAM/bar in OWNER/bar
+(
+  cd "$OWNER/bar"
+  git fetch
+  git checkout newbar
+) &> /dev/null || die
+
+test-exists \
+  "$OWNER/bar/FooBar"
+
+test-exists \
+  "$OWNER/bar/FooBaz"
+
+if [[ $nested_fix == 1 ]] ; then
+  # nested subrepo skipped at push: no bar/bar
+  [[ ! -f "$OWNER/bar/bar/FooBaz" ]]
+else
+  # nested subrepo (in subdir bar/bar) added as well
+  test-exists \
+    "$OWNER/bar/bar/FooBaz"
+fi
+
+done_testing
+
+teardown