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network isolation: set hostname to localhost #530

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network isolation: set hostname to localhost #530

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10 changes: 9 additions & 1 deletion src/fromager/run_network_isolation.sh
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Original file line number Diff line number Diff line change
@@ -1,11 +1,14 @@
#!/usr/bin/env -S unshare -rn /bin/bash
#!/usr/bin/env -S unshare --uts --net --map-root-user /bin/bash
#
# Run command with network isolation (CLONE_NEWNET) and set up loopback
# interface in the new network namespace. This is somewhat similar to
# Bubblewrap `bwrap --unshare-net --dev-bind / /`, but works in an
# unprivilged container. The user is root inside the new namespace and mapped
# to the euid/egid if the parent namespace.
#
# Unshare UTS namespace, so we can set the hostname to "localhost", so
# lookup of "localhost" does not fail.
#
# Ubuntu 24.04: needs `sysctl kernel.apparmor_restrict_unprivileged_userns=0`
# to address `unshare: write failed /proc/self/uid_map: Operation not permitted`.
#
Expand All @@ -21,5 +24,10 @@ fi
# bring loopback up
ip link set lo up

# set hostname to "localhost"
if command -v hostname 2>&1 >/dev/null; then
hostname localhost
fi

# replace with command
exec "$@"
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