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pi-hole
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Add fallback option for OS check without hard-coded nameserver 

Signed-off-by: Christian König <github@yubiuser.dev>
This commit is contained in:
Christian König 2024-09-03 22:31:13 +02:00
parent a965afa249
commit 50dcd8d62f
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1 changed files with 29 additions and 4 deletions
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33
automated install/basic-install.sh
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@ -177,7 +177,7 @@ os_check() {
detected_os=$(grep '^ID=' /etc/os-release | cut -d '=' -f2 | tr -d '"')
detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
# Test via IPv4
# Test via IPv4 and hardcoded nameserver ns1.pi-hole.net
cmdResult="$(
dig -4 +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1
echo $?
@ -198,7 +198,7 @@ os_check() {
fi
fi
# Try again via IPv6
# Try again via IPv6 and hardcoded nameserver ns1.pi-hole.net
if [ "$valid_response" = false ]; then
unset valid_response
@ -223,6 +223,31 @@ os_check() {
fi
fi
# Try again without hardcoded nameserver
if [ "$valid_response" = false ]; then
unset valid_response
cmdResult="$(
dig +short -t txt "${remote_os_domain}" 2>&1
echo $?
)"
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
# Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
response="${cmdResult%%$'\n'*}"
# If the value of ${response} is a single 0, then this is the return code, not an actual response.
if [ "${response}" == 0 ]; then
valid_response=false
else
valid_response=true
fi
fi
fi
if [ "$valid_response" = true ]; then
IFS=" " read -r -a supportedOS < <(echo "${response}" | tr -d '"')
for distro_and_versions in "${supportedOS[@]}"; do
@ -259,8 +284,8 @@ os_check() {
printf " %b %bRetrieval of supported OS list failed. %s. %b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${errStr}" "${COL_NC}"
printf " %bUnable to determine if the detected OS (%s %s) is supported%b\\n" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
printf " Possible causes for this include:\\n"
printf " - Firewall blocking certain DNS lookups from Pi-hole device\\n"
printf " - ns1.pi-hole.net being blocked (required to obtain TXT record from versions.pi-hole.net containing supported operating systems)\\n"
printf " - Firewall blocking DNS lookups from Pi-hole device to ns1.pi-hole.net\\n"
printf " - DNS resolution issues of the host system\\n"
printf " - Other internet connectivity issues\\n"
else
printf " %b %bUnsupported OS detected: %s %s%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"