[__single_binary_service] Add manpage, config-file and better absent
With these changes the type is good for general consumption (modulo the limitations mentioned in the manpage under TODO).
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cdist-type__evilham_single_binary_service(7)
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============================================
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NAME
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----
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cdist-type__evilham_single_binary_service - Setup a single-binary service
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DESCRIPTION
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-----------
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This type is designed to easily deploy and configure a single-binary service
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named `${__object_id}`.
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A good example of this are Prometheus exporters.
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This type makes certain assumptions that might not be correct on your system.
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If you need more flexibility, please get in touch and provide a use-case
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(and hopefully a backwards-compatible patch).
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This type will place the downloaded binary and, if requested, other extra
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binaries in `/usr/local/bin`.
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If a `--config-file-source` is provided, it will be placed under:
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`/etc/${__object_id}.conf`.
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TODO (patches welcome!):
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- It currently only supports `.tar.gz` archives.
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- It currently only supports systemd units.
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- Does not handle properly BSD-systems (wheel group, /usr/local/etc, systemd)
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REQUIRED PARAMETERS
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-------------------
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checksum
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This will be passed verbatim to `__download(7)`.
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Use something like `sha256:...`.
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url
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This will be passed verbatim to `__download(7)`.
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version
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This type will use a thumbstone file with a "version" number to track
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whether or not a service must be updated.
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This thumbstone file is placed under
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`/usr/local/bin/.${__object_id}.cdist.version`.
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BOOLEAN PARAMETERS
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------------------
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unpack
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If present, the contents of `--url` will be treated as an archive to be
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unpacked with `__unpack(7)`.
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See also `--unpack-args` and `--extra-binary`.
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do-not-manage-user
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Always considered present when `--user` is `root`.
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If present, the user in `--user` will not be managed by this type with
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`__user`, this means it *must* exist beforehand when installing the service
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and it will not be removed by this type.
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OPTIONAL PARAMETERS
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-------------------
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config-file-source
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If present, this file's contents will be placed under
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`/etc/${__object_id}.conf` with permissions `0440` and ownership assigned to
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`--user` and `--group`.
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If `-` is passed, this type's `stdin` will be used.
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user
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The user under which the service will run. Defaults to `root`.
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If this user is not `root` and `--do-not-manage-user` is not present,
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this user will be created or removed as per the `--state` parameter.
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group
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The group under which the service will run. Defaults to `--user`.
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state
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Whether the service is to be `present` (default) or `absent`.
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When `absent`, this type will clean any binaries listed in `--extra-binary`
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and also the config file as described in `--config-file-source`.
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binary
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This will be the binary name. Defaults to `${__object_id}`.
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If `--unpack` is used, a binary with this name must be unpacked.
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Otherwise, the contents of `--url` will be placed under this binary name.
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service-args
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Any extra arguments to pass along with `--service-exec`.
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service-exec
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The executable to use for this service.
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Defaults to `/usr/local/bin/BINARY_NAME` where `BINARY_NAME` is the
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resulting value of `--binary`.
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service-description
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The service description to be used in, e.g. the systemd unit file.
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Defaults to `cdist-managed '${__object_id}' service`.
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unpack-args
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Only has an effect if `--unpack` is used.
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These arguments will be passed verbatim to `__unpack(7)`.
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Very useful as this type assumes the archive does not have the binaries in
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subdirectories; that can be worked around with
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`--unpack-args '--tar-strip 1'`.
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OPTIONAL MULTIPLE PARAMETERS
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----------------------------
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extra-binary
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Only useful with `--unpack`.
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If passed, these binaries will also be installed when `--state` is `present`
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and removed when `--state` is `absent`.
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Handle with care :-).
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EXAMPLES
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--------
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.. code-block:: sh
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# Install and enable the ipmi_exporter service
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# The variables are defined in the manifest previously
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__evilham_single_binary_service ipmi_exporter \
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--user "${USER}" \
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--service-args ' --config.file=/etc/ipmi_exporter.conf' \
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--version "${SHOULD_VERSION}" \
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--checksum "${CHECKSUM}" \
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--url "${DOWNLOAD_URL}" \
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--state "present" \
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--unpack \
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--unpack-args "--tar-strip 1" \
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--config-file-source '-' <<-EOF
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# Remotely managed, changes will be lost
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# [...] config contents goes here
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EOF
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# Remove the ipmi_exporter service along with the user and its config
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__evilham_single_binary_service ipmi_exporter \
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--user "${USER}" \
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--version "${SHOULD_VERSION}" \
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--checksum "${CHECKSUM}" \
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--url "${DOWNLOAD_URL}" \
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--state "absent"
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# Same, but the service was using my user! Let's not delete that!
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__evilham_single_binary_service ipmi_exporter \
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--user "evilham" \
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--do-not-manage-user \
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--version "${SHOULD_VERSION}" \
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--checksum "${CHECKSUM}" \
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--url "${DOWNLOAD_URL}" \
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--state "absent"
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SEE ALSO
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--------
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- `__download(7)`
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- `__unpack(7)`
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AUTHORS
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-------
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Evilham <contact@evilham.com>
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COPYING
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-------
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Copyright \(C) 2021 Evilham.
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39
manifest
39
manifest
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@ -1,9 +1,12 @@
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#!/bin/sh -e
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BIN_DIR="/usr/local/bin"
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ETC_DIR="/etc"
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# Ensure the target bin dir exists
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# Care, we never want to remove it :-D
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__directory "${BIN_DIR}" \
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--state "exists" \
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--mode 0755
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export require="${require} __directory${BIN_DIR}"
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@ -46,8 +49,13 @@ CHECKSUM="$(cat "${__object}/parameter/checksum")"
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SHOULD_VERSION="$(cat "${__object}/parameter/version")"
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# Create a user for the service if it is not root
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if [ "${USER}" != "root" ]; then
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__user "${USER}" \
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if [ "${USER}" != "root" ] && \
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[ ! -f "${__object}/parameter/do-not-manage-user" ]; then
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if [ "${STATE}" = "absent" ]; then
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# When removing, ensure user is not being used
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user_require="__systemd_unit/${SERVICE_NAME}.service"
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fi
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require="${require} ${user_require}" __user "${USER}" \
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--system \
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--state "${STATE}" \
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--home /nonexistent \
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@ -56,10 +64,29 @@ if [ "${USER}" != "root" ]; then
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service_require="${service_require} __user/${USER}"
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fi
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# Place config file if necessary
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CONFIG_FILE_DEST="${ETC_DIR}/${SERVICE_NAME}.conf"
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CONFIG_FILE_SOURCE="$(cat "${__object}/parameter/config-file-source" 2>/dev/null || true)"
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if [ "${CONFIG_FILE_SOURCE}" = "-" ]; then
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CONFIG_FILE_SOURCE="${__object}/stdin"
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fi
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if [ -n "${CONFIG_FILE_SOURCE}" ] && [ "${STATE}" = "present" ]; then
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require="${require} __user/${USER}" __file \
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"${CONFIG_FILE_DEST}" \
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--owner "${USER}" \
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--group "${GROUP}" \
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--mode "0440" \
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--source "${CONFIG_FILE_SOURCE}"
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service_required="${service_required} __file${CONFIG_FILE_DEST}"
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fi
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# TODO: Support non-systemd
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__systemd_unit "${SERVICE_NAME}.service" \
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--source "-" \
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--state "${STATE}" \
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--restart \
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--enablement-state "enabled" <<EOF
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[Unit]
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Description=${SERVICE_DESCRIPTION}
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@ -81,6 +108,12 @@ service_require="${service_require} __systemd_unit/${SERVICE_NAME}.service"
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# Proceed after user and service description have been prepared
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export require="${require} ${service_require}"
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# Perform a service restart if config has changed
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if [ "${STATE}" = "present" ]; then
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__check_messages "${SERVICE_NAME}_config" \
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--pattern "^__file${CONFIG_FILE_DEST}" \
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--execute "service ${SERVICE_NAME} restart"
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fi
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VERSION_FILE="${BIN_DIR}/.${SERVICE_NAME}.cdist.version"
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IS_VERSION="$(cat "${__object}/explorer/explorer-version")"
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@ -149,10 +182,12 @@ EOF
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"${VERSION_FILE}" \
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--source "-"
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fi
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if [ "${STATE}" = "absent" ]; then
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# Perform cleanup of generated files
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for bin_file in ${BINARY} ${EXTRA_BINARIES}; do
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__file "${BINARY_PREFIX}/${bin_file}" --state "absent"
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done
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__file "${VERSION_FILE}" --state "absent"
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__file "${CONFIG_FILE_DEST}" --state "absent"
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fi
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@ -1 +1,2 @@
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do-not-manage-user
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unpack
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@ -1,3 +1,4 @@
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config-file-source
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user
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group
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state
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