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It doesn't break supply chain security for anybody with power to change the situation.
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It is an easy to overlook this, but even for someone in position of power to change, creating different code with the same hash is borderline impossible.
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Non-sequitor? They're not providing a (sha-1) hash, they're providing source code to integration partners using their business channels, not public git providers. Those business channels include contracts etc to "secure their supply chain".

You and I aren't in those business channels, and we're not being given anything with a hash. There's simply no hash to collide with?

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A git hash is cryptographically secure. It doesn't matter how you distribute it. That is the entire point you're missing.
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