fabic974 random (binary) wanderings in the philament empires…

Git submodule foreach selective update

It is possible to use Bash expressions as arguments to git submodule foreach ... Hence given a project with loads of dependencies checked-out as submodules, updating only a subset of these that reside in, say vendor/extra/, may be achieved with :

cd vendor/extra/ &&
  git submodule foreach \
    '[[ $path =~ ^../ ]] || (time git remote update)'

Enter each submodule that live under the current directory, and checkout branch release_60 that each have (it’s LLVM/Clang btw.) ; upon error we’re dropped into a Bash shell for fixing things :

git submodule foreach       \
  '[[ $path =~ ^../ ]] ||   \
                            \
      (git checkout -b release_60 origin/release_60 || bash)'