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Fix build failures on systems with unprivileged_userns_clone=0 #15131

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Fix build failures on systems with unprivileged_userns_clone=0 #15131

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9 changes: 9 additions & 0 deletions src/libstore/unix/build/linux-derivation-builder.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -429,6 +429,15 @@ struct ChrootLinuxDerivationBuilder : ChrootDerivationBuilder, LinuxDerivationBu
sandboxGid(),
settings.sandboxBuildDir));

/* Write /etc/group to prevent build failures
on systems with unprivileged_userns_clone=0. */
writeFile(
chrootRootDir / "etc" / "group",
fmt("root:x:0:\n",
"nixbld:!:%1%:\n",
"nogroup:x:65534:\n",
sandboxGid()));

/* Save the mount- and user namespace of the child. We have to do this
*before* the child does a chroot. */
auto sandboxPath = thisProcPath / "ns";
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