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tools.pxe-serve: serve from a world-traversable directory
author
lassulus
date
(Sep 13, 2026, 12:13 AM CEST)
commit
1d76352c
1d76352c05f0687b3848c7881840a4c45dd53bbe
parent
d69747cd
d69747cde070874458c029cdbf3cd63b847defd2
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tools/pxe-serve/pxe-serve.sh
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tools/pxe-serve/pxe-serve.sh
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# after running, so it deleted the served directory out from under a still
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# running dnsmasq and then went back to waiting. Only symlinks live here, so
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# leaving them behind between runs costs nothing.
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ROOT="${XDG_RUNTIME_DIR:-/tmp}/${PROG}/${MACHINE}"
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#
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# Not under XDG_RUNTIME_DIR: dnsmasq drops privileges after startup, and
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# /run/user/$UID is mode 0700, so the unprivileged dnsmasq cannot traverse it
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# ("TFTP directory ... inaccessible: Permission denied", then it refuses to
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# start). Everything served is a symlink into the world-readable nix store,
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# so a world-traversable directory costs nothing.
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ROOT="/var/tmp/${PROG}/${MACHINE}"
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rm -rf "$ROOT"
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mkdir -p "$ROOT"
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chmod 755 "$ROOT"
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chmod 755 "/var/tmp/${PROG}" "$ROOT"
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ln -s "${KERNEL}/${KERNEL_FILE}" "$ROOT/bzImage"
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ln -s "${INITRD}/initrd" "$ROOT/initrd"