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2026-02-13 11:11:48 -06:00

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Approach for updating Pi-hole v6 pihole.toml without python/perl

Constraint: Pi-hole container only has sh, sed, awk, grep

Method 1: Extract-Replace-Merge

Extract everything before 'hosts = [' line
Write new hosts array
Extract everything after matching ']'
Concatenate all parts

Shell commands:

Before hosts array

sed -n '1,/^:space:hosts:space:=/p' pihole.toml | head -n -1 > part1.toml

New hosts array

cat >> part1.toml <<EOF hosts = [ "10.10.0.16 domain1.com", "10.10.0.16 domain2.com" ] EOF

After hosts array (skip until first ] after hosts =)

awk '/^:space:hosts:space:=/,/]/ {found=1; next} found {print}' pihole.toml >> part1.toml

Replace original

mv part1.toml pihole.toml

Method 2: Line-by-line state machine with awk awk ' BEGIN { in_hosts=0; done=0 } /^:space:hosts:space:=/ && !done { print " hosts = [" print " "10.10.0.16 domain1.com"," print " "10.10.0.16 domain2.com""
print " ]" in_hosts=1 done=1 next } in_hosts && /]/ { in_hosts=0; next } !in_hosts { print } ' pihole.toml

Implementation in script:

Build TOML_HOSTS variable with proper escaping
Inject into awk/sed command
Execute via docker exec pihole sh -c

Test first on primary, then secondary

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