cmd/oc: disable docker's use of pigz earlier #130
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Due to a race condition in Docker[1], we need to disable extraction using unpigz. Currently this is done in the image extraction code, however this code is multi-threaded. Setenv is not thread safe in C[2], so even thought it is safe in go[3], there's a small risk if there's any C threads running. It's safer to just set this env variable once when `oc` starts, rather every time the layerByEntry function is called. [1] moby/moby#39859 [2] rust-lang/rust#24741 [3] https://github.com/golang/go/blob/a38a917aee626a9b9d5ce2b93964f586bf759ea0/src/syscall/env_unix.go#L18
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Due to a race condition in Docker[1], we need to disable extraction
using unpigz. Currently this is done in the image extraction code,
however this code is multi-threaded. Setenv is not thread safe in C[2],
so even thought it is safe in go[3], there's a small risk if there's
any C threads running.
It's safer to just set this env variable once when
ocstarts, ratherevery time the layerByEntry function is called.
[1] moby/moby#39859
[2] rust-lang/rust#24741
[3] https://github.com/golang/go/blob/a38a917aee626a9b9d5ce2b93964f586bf759ea0/src/syscall/env_unix.go#L18