140 lines
4.5 KiB
Smarty
140 lines
4.5 KiB
Smarty
#!/bin/bash
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{{/*
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# Copyright 2017 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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*/}}
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set -e
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cat <<'EOF' > {{ .chroot_mnt_path | quote }}/tmp/sysctl_host.sh
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{{ include "divingbell.shcommon" . }}
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# TODO: Make prefix configurable to control param loading order
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fname_prefix='60-divingbell-'
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defaults_path='/var/divingbell/sysctl'
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persist_path='/etc/sysctl.d'
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reload_system_configs=false
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if [ ! -d "${defaults_path}" ]; then
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mkdir -p "${defaults_path}"
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fi
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write_test "${defaults_path}"
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write_test "${persist_path}"
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add_sysctl_param(){
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local user_key="${1}"
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die_if_null "${user_key}" ", 'user_key' not supplied to function"
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local user_val="${2}"
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die_if_null "${user_val}" ", 'user_val' not supplied to function"
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# Try reading the current sysctl tunable param / value
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# If sysctl cannot find the specified tunable, script will exit here
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local system_key_val_pair
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system_key_val_pair="$(sysctl $user_key)"
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# For further operation, use the tunable name returned by sysctl above,
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# rather than the one specified by the user.
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# sysctl gives a consistently formatted tunable (e.g., net.ipv4.ip_forward)
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# regardless of input format (e.g., net/ipv4/ip_forward).
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local system_key
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system_key="$(echo ${system_key_val_pair} |
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cut -d'=' -f1 | tr -d '[:space:]')"
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[ -n "${system_key}" ] || die 'Null variable exception'
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# Store current kernel sysctl default in the event we need to restore later
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# But only if it is the first time we are changing the tunable,
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# to capture the orignal value.
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local system_val
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system_val="$(echo ${system_key_val_pair} |
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cut -d'=' -f2 | tr -d '[:space:]')"
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[ -n "${system_val}" ] || die 'Null variable exception'
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local orig_val="${defaults_path}/${fname_prefix}${system_key}.conf"
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if [ ! -f "${orig_val}" ]; then
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echo "${system_key_val_pair}" > "${orig_val}"
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fi
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# Apply new setting. If an invalid value were provided, sysctl would choke
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# here, before making the change persistent.
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if [ "${user_val}" != "${system_val}" ]; then
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sysctl -w "${system_key}=${user_val}"
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fi
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# Persist the new setting
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file_content="${system_key}=${user_val}"
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file_path="${persist_path}/${fname_prefix}${system_key}.conf"
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if [ -f "${file_path}" ] &&
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[ "$(cat ${file_path})" != "${file_content}" ] ||
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[ ! -f "${file_path}" ]
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then
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echo "${file_content}" > "${file_path}"
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reload_system_configs=true
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log.INFO "Sysctl setting applied: ${system_key}=${user_val}"
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else
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log.INFO "No changes made to sysctl param: ${system_key}=${user_val}"
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fi
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curr_settings="${curr_settings}${fname_prefix}${system_key}.conf"$'\n'
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}
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{{- range $key, $value := .sysctl }}
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add_sysctl_param {{ $key | quote }} {{ $value | quote }}
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{{- end }}
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# Revert any previously applied sysctl settings which are now absent
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prev_files="$(find "${defaults_path}" -type f)"
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if [ -n "${prev_files}" ]; then
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basename -a ${prev_files} | sort > /tmp/prev_settings
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echo "${curr_settings}" | sort > /tmp/curr_settings
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revert_list="$(comm -23 /tmp/prev_settings /tmp/curr_settings)"
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IFS=$'\n'
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for orig_sysctl_setting in ${revert_list}; do
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rm "${persist_path}/${orig_sysctl_setting}"
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sysctl -p "${defaults_path}/${orig_sysctl_setting}"
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rm "${defaults_path}/${orig_sysctl_setting}"
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reload_system_configs=true
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log.INFO "Reverted sysctl setting:" \
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"$(cat "${defaults_path}/${orig_sysctl_setting}")"
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done
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fi
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# Final validation of sysctl settings written to /etc/sysctl.d
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# Also allows for nice play with other automation (or manual) systems that
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# may have separate overrides for reverted tunables.
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if [ "${reload_system_configs}" = "true" ]; then
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sysctl --system
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fi
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if [ -n "${curr_settings}" ]; then
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log.INFO 'All sysctl configuration successfully validated on this node.'
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else
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log.WARN 'No syctl overrides defined for this node.'
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fi
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exit 0
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EOF
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chmod 755 {{ .chroot_mnt_path | quote }}/tmp/sysctl_host.sh
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chroot {{ .chroot_mnt_path | quote }} /tmp/sysctl_host.sh
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sleep 1
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echo 'INFO Putting the daemon to sleep.'
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while [ 1 ]; do
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sleep 300
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done
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exit 0
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