Custom structure multi project build and git (flow)

Hello,

I am working on a rather complex multi project build recently migrated to gradle. The each project it’s in its own reporsitory and when checked out the structure is like this:

root/.git
root/root/build.gradle
root/root/settings.gradle
root/root/gradle.properties

subproject1/.git
subproject1/subproject1/build.gradle

and so on.
The root/subproject relationship work fine thanks to some code that in settings.gradle allows me to locate the subproject with the above structure

Given that I have kind of 100 of those subprojects I was wondering if there is a clever way to issue git (or even better git flow) commands from the root project and affect either a specific module or all modues in one go.

I have found some git plugins for gradle but could not really have them working. I would appriciate first hand experience with this kind of problem or suggestions for an alternative solution

Thanks