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fix: copy sudo binary before setting setuid bit #9

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Merged
megheaiulian merged 1 commit into from
Feb 10, 2026
Merged

fix: copy sudo binary before setting setuid bit #9

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11 changes: 7 additions & 4 deletions images/nix/flake.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -202,10 +202,13 @@ eval "$(direnv hook bash)"
mkdir -p ./tmp
chmod 1777 ./tmp

# sudo: set the setuid bit on the sudo binary.
# nixpkgs deliberately strips it from the Nix store; fakeroot
# records the permission and tar --hard-dereference preserves
# it in the Docker layer.
# sudo: replace the symlink with a real copy, then set the
# setuid bit. symlinkJoin creates ./bin/sudo as a symlink into
# the Nix store. tar (without --dereference) archives symlinks
# as-is, so fakeroot-tracked permissions on the target are lost.
# Copying the binary makes it a regular file whose mode fakeroot
# can record and tar will faithfully preserve in the layer.
cp --remove-destination "$(readlink -f ./bin/sudo)" ./bin/sudo
chmod 4755 ./bin/sudo

# Replace the sudo package's default /etc/sudoers with our own.
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