Know how else git submodule is broken? git grep in a submodule doesn't work. While grep -r XXX . does.
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Like a recursive grep but it understands what's not part of the source tree and can be used on any commit, etc. rather than simply what you have checked out at the moment. It's quite useful simply for not looking in .git, build output, etc. without excluding that stuff.
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I think subtrees make more sense for tightly bound components and repo is a nicer approach than submodules for other things.
Submodules are bad enough that both AOSP and Chromium invented their own versions of it to work around how broken/weird/painful they are to deal with.
Yeah, I won't ever use/introduce submodules into a project if I can avoid it. I'm 100% for subtrees. Mainly because today's software w/ things like leftpad/mimemagic causing pain.
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I don't mind repo because it's simply a text file describing repositories via branch, tag, revision, etc. and it's nice to deal with for overriding repositories and so on. It essentially works like submodules if you reference things via revision which you do for a release.
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That's why I bring up repo. That's built for AOSP which is a source tree for far more than the OS. It also has the SDK, massive test suites and many other things. A lot of projects are externally developed with their own Git histories and it's meant to handle forks well, etc.
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