Add support for escaping resolv.conf symlinks#318
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AkihiroSuda merged 3 commits intorootless-containers:masterfrom Aug 17, 2023
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Add support for escaping resolv.conf symlinks#318AkihiroSuda merged 3 commits intorootless-containers:masterfrom
AkihiroSuda merged 3 commits intorootless-containers:masterfrom
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Signed-off-by: Jason T. Greene <[email protected]>
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Signed-off-by: Jason T. Greene <[email protected]>
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PTAL @AkihiroSuda @giuseppe |
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Previously if resolv.conf was symlinked to a location other than /etc, or /run, a warning message would be printed and DNS would be non-functional. Instead, attempt to bind an equiavlent resolv.conf link target path in the namespace structure, so that symlink continues to function, and DNS remains operational. Signed-off-by: Jason T. Greene <[email protected]>
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@AkihiroSuda you're welcome! Thanks for including this in your 1.2.1 release plans! It will be great to get this one out to users. |
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Thank you for this PR! It's great to see support for escaping |
This was referenced Dec 24, 2023
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Previously if resolv.conf was symlinked to a location other than /etc, or /run, a warning message would be printed and DNS would be non-functional.
Instead, attempt to bind an equivalent resolv.conf link target path in the namespace structure, so that symlink continues to function, and DNS remains operational.
This fixes usage in WSL environments which symlinks /etc/resolv.conf under a shared location under /mnt. Although I suspect this usage pattern is fairly common in other environments.
Alternatively, instead of mirroring the target path, this could have utilized the newer open_tree/move_mount syscalls, to bind mount on top of the /etc/resolv.conf symlink. However, this would have limited the support to 5.2 kernels and later, so just cloning the target seemed the way to go.
Note: this PR also includes some commits to fix CI