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Add copyderef workaround for symlink-unfriendly filesystems #112
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We allow two methods to enable this workaround: Setting `BINARYPROVIDER_COPYDEREF=true` in your environment to force it on, and also auto-detection that runs every time you try to `unpack()` a tarball. If auto-detection triggers (e.g. we attempt to create a symlink and it fails, and symlinks are able to be created within `tempdir()`) we automatically enable `copyderef` mode, which will extract tarballs into `tempdir()`, then copy the files from that temporary directory into the true destination, collapsing symlinks and skipping broken links.
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May 10, 2019
First cut at documentation
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We allow two methods to enable this workaround: Setting
BINARYPROVIDER_COPYDEREF=truein your environment to force it on, andalso auto-detection that runs every time you try to
unpack()atarball. If auto-detection triggers (e.g. we attempt to create a symlink
and it fails, and symlinks are able to be created within
tempdir())we automatically enable
copyderefmode, which will extract tarballs intotempdir(), then copy the files from that temporary directory into thetrue destination, collapsing symlinks and skipping broken links.