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Show the build user's group in /etc/group in chroots.
* src/libstore/build.cc (nix::DerivationGoal::startBuilder): Create /etc/group showing the build user's group.
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@ -1578,6 +1578,12 @@ void DerivationGoal::startBuilder()
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% (buildUser.enabled() ? buildUser.getUID() : getuid())
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% (buildUser.enabled() ? buildUser.getGID() : getgid())).str());
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/* Declare the build user's group so that programs get a consistent
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view of the system (e.g., "id -gn"). */
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writeFile(chrootRootDir + "/etc/group",
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(format("nixbld:!:%1%:\n")
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% (buildUser.enabled() ? buildUser.getGID() : getgid())).str());
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/* Bind-mount a user-configurable set of directories from the
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host file system. The `/dev/pts' directory must be mounted
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separately so that newly-created pseudo-terminals show
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