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3,250 commits this week Mar 28, 2026 - Apr 04, 2026
Use rsync --chmod=u+w to fix builds on VirtioFS-backed stores
Apple's VirtioFS (used by nix-linux-builder for Linux-on-Darwin builds)
does not honor Linux DAC_OVERRIDE. When rsync -a copies from read-only
Nix store paths, it preserves the 555 directory permissions, creating
truly unwritable directories on VirtioFS. Subsequent file writes into
these directories fail with EACCES.

Adding --chmod=u+w to rsync makes directories owner-writable as they
are created, preventing the permission lockout. This is a no-op on
native Linux where DAC_OVERRIDE already grants write access regardless
of directory permissions.

The separate chmod -R +w calls are no longer needed since rsync now
sets the correct permissions during copy.