Get git commit id from tarball about giget HOT 3 OPEN

Interesting idea. I think somehow we should extract such metadata from tar archive. We use node-tar internally might be a way to retrieve commit id.

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Thanks. Seems reading is not that hard even if node-tar does not supports, we can easily find comment header: (update we can: https://github.com/isaacs/node-tar#class-tarpax)

> head release.tar
pax_global_header00006660000000000000000000000064143737264400014524gustar00rootroot0000000000000052 comment=8ddd2a4eb6045710c1bac9761e97152cf6af4b8a

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Reference: https://github.com/git/git/blob/master/builtin/get-tar-commit-id.c

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