replaces UpdateController.sh
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163
update_psa
Executable file
163
update_psa
Executable file
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#!/bin/bash
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# set -x
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source ./log_helpers
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source ./git_helpers
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# source ./update_helpers.sh
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# source ./opkg_helpers.sh
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source ./update_psa_helpers
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source ./read_config
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###############################################################################
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# update_psa
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#
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# Implementing the UpdateController (see below). UpdateController is waiting
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# for an external trigger by the DeviceController (DC). The trigger is sent via
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# an UNIX-pipe (=fifo). When DC triggers UpdateController, it has to check if
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# an update is possible, i.e. is has to lock the PSA for the update procedure.
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# UpdateController will send back the update-result to DeviceController
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# which unlocks the PSA to return to nomal operation.
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#
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# If UpdateController has been triggered, it checks out a predefined git-
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# repository. As a sanity check it makes sure that there are some changes in
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# the repository. In case there are no changes, it issues an error message
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# to DC and returns to its wait-state.
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#
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# Otherwise it checks if the changed files are correct (using md5) and if
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# the new files are valid for the PSA. If there is some problem, it issues an
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# error message to DC, reverts the git-repository to its previous state and
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# returns to its wait-state.
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#
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# Otherwise it makes a backup of the current state of the PSA, and if there
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# are opkg-packages to install it runs a dry installation process using opkg.
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# In case of error, it issues an error message to DC, deletes the backup,
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# reverts # the git-repository to its previous state and returns to its
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# wait-state.
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#
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# Otherwise, it copies all new files to their target locations and in case
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# of opkg-packages, it installs the packages.
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#
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# In case of error it restores the previous state using the backup and
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# reinstalls the previous opkg-package(s). It issues an error message to
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# DC and returns to its wait-state.
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#
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# Otherwise the update went well, and it does some cleanup, sends a success
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# message to DC and returns to its wait-state.
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#
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###############################################################################
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#
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# UPDATE PROCEDURE
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#
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###############################################################################
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update() {
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local try_update_count=0
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local func="${FUNCNAME[0]}"
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# read config parameters
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# read_config
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log_debug "$func:${LINENO}: fetch/merge updates..."
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# Fetch new updates (using git)
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while :
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do
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local repository_is_already_up_to_date=""
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if ! fetch_customer_updates repository_is_already_up_to_date; then
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if [ "$repository_is_already_up_to_date" = "yes" ]; then
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log_error "$func:${LINENO}: $customer_id is up-to-date"\
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"-> no files to update -> no psa update"
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exit 1
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fi
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try_updates_count=$((try_updates_count+1))
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if [[ "$try_updates_count" -eq 5 ]]; then
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log_error "$func:${LINENO}: fetch/merging failed" ; exit 1
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fi
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sleep 60s
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else
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# Fetched updates successfully
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try_updates_count=0
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break
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fi
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done
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# Backup before any updates in case some previous test was wrong
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if ! backup_previous_version; then
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log_error "$func:${LINENO}: backup failed"
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revert_customer_repository ; exit 1
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fi
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files=$(changed_file_names)
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if ! check_md5_for_changed_customer_files $files ; then
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log_error "$func:${LINENO}: new customer files wrong"
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revert_customer_repository ; exit 1
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fi
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if grep -qE ".*opkg_commands.*?" <<< $files; then
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# read opkg_cmds: each line respresents an opkg-command
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readarray opkg_commands < <(cat $opkg_cmds_file)
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for opkg_command in "${opkg_commands[@]}"; do
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if grep -qE "^\s*[#]+.*?$" <<< $opkg_command; then
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continue # found comment line
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fi
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# FIXME: sollte nicht gebraucht werden
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opkg_command=${opkg_command//[$'\r\n\t']/ }
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local package=$(printf '%s' "$opkg_command" | awk '{ print $NF }')
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local opkg_output=()
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if ! exec_opkg_info "$package" opkg_output; then
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log_error "$func:${LINENO}: opkg --noaction $opkg_command failed"
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revert_customer_repository ; exit 1
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fi
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# FIXME: sollte am anfang so gesetzt werden
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SAVEIFS=$IFS
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IFS=$'\n'
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if ! check_md5_for_opkg_packages opkg_output; then
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log_error "$func:${LINENO}: wrong md5sum for some opkg packages"
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revert_customer_repository ; exit 1
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fi
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IFS=$SAVEIFS
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# perform a dry-run and check if everything might work as expected.
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# Actually execute the opkg command
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if ! exec_opkg $opkg_command; then
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log_error "$func:${LINENO}: do_update failed"
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fallback_to_previous_version
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revert_customer_repository ; exit 1
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fi
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done
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else
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log_info "$func:${LINENO}: no opkg commnds to execute"
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fi
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# Cleanup.
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if ! cleanup_previous_version; then
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log_error "$func:${LINENO}: cleanup_previous_version failed"
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fi
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log_info "$func:${LINENO}: success"
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exit 0
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}
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###############################################################################
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if [ $# -ne 1 ] ; then
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echo "Usage: $0 filename"
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exit 1
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else
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# if [ -z $IFS ]; then
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# IFS=$'\n'
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# fi
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if read_config "$1" ; then
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# set -x
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if clone_customer_repository $repository_path ; then
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update
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fi
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fi
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fi
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