499 lines
11 KiB
Bash
Executable File
499 lines
11 KiB
Bash
Executable File
#!/bin/bash
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## Sequencer script is doing nothing on its own. It is included by a squence script
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## which uses the sequencer.sh to provide sequencial operations with or without
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## user interaction (see seqTemplate.sh)
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## Version information
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VERSION_REV=4
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VERSION_MAJOR=0
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VERSION_MINOR=0
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## Start of generic script part
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QUIET=0
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DRY=0
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VERBOSE=0
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ERNO=0
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MAX_STEP=255
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ALIAS=
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TEMPLATE_NAME=seqTemplateExample.sh
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MISSING_CONF=missingConf.log
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VERSION_STRING="${VERSION_REV}.${VERSION_MAJOR}.${VERSION_MINOR}"
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helpSequencer() {
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echo "Usage: ${0##*/} [OPTIONS] [STEP NUMBER(s) or ALIAS]"
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echo
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echo " [OPTIONS]"
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echo " --dry-run, -d : Only print to console what would be done"
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echo " ! Attention - Sequence must support this"
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echo " --help, -h : Display help"
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echo " --quiet, -q : Don't ask for permission to execute steps"
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echo " If called without starting step number, only this help is shown"
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echo " --verbose, -v : Verbose output (use exe() function to call shell commands in seqs)"
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echo " ( e.g.: exe apt update )"
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echo " --version : Display version of sequencer and revision of sequence"
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echo
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echo " [STEP NUMBER(s) 1-${MAX_STEP} or ALIAS]"
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echo " Single STEP or ALIAS : starting point of process"
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echo " Multiple STEPS or ALIAS : execute only given steps"
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echo " execute only one step with using special step 0"
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echo " ( e.g. only execute step 4: $0 4 0 )"
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}
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# endCheckEmpty [VariableName] [DESCRIPTION]
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# DESCRIPTION : Optional text for error
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endCheckEmpty() {
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local errorText=$1
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eval 'local ref=$'$1
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if [ ! -z "$2" ] ; then
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errorText=$2
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fi
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if [ -z $ref ] ; then
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echo -e "[Error] $errorText must not be empty.\nAborting installation."
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exit 666
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fi
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}
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existsFunction() {
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local NOTFOUND=0
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declare -F $1 &>>/dev/null || NOTFOUND=1
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return $NOTFOUND
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}
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saveReturn() {
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if [ $1 -ne 0 ] ; then
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ERNO=$1
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fi
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}
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# endReturn [-f]
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# -f : force exit with $ERNO without user input
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endReturn() {
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if [[ ( $ERNO -ne 0 && $QUIET -ne 0 ) || ( $ERNO -ne 0 && ! -z $1 && $1 == "-f" ) ]] ; then
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echo
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echo -e "[Error] Return value $ERNO detected.\nAborting installation."
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exit $ERNO
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fi
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if [ $ERNO -ne 0 ] ; then
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echo
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echo "[Error] Return value $ERNO detected."
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read -p "End installation: y(default)/n? " answer
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case $answer in
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[nN])
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echo
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echo Continuing installation...
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;;
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*)
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echo
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echo Installation aborted
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exit $ERNO;
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;;
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esac
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fi
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}
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# addConf <CONF_MODE> <CONFIGTEXT> <CONFIGFILE>
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# trying to write a file
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# if exists, one attempt is made to create bck file of it
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# if all fails, a log file is created with the conflicts to be resolved by the user
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addConf() {
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local confMode=""
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case "$1" in
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-c) # create a new file
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confMode="-c"
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;;
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-a) # append to existing file
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confMode="-a"
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;;
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-s) # skip if CONFIGFILE exists
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confMode="-s"
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;;
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-m) # only add content to missing conf and warn user
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confMode="-m"
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;;
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*) # default
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echo "Parameter 1 (-a|-c|-m|-s) missing for addConf()"
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exit 0;
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;;
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esac
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if [ "$DRY" -ne 0 ] ; then
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echo "-- Writing $3...dry-run"
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return 0;
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fi
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echo -n "Writing $3..."
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if [ $confMode != "-m" ] ; then
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# try writing config directly
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if [ ! -f "$3" ] ; then
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case "$confMode" in
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-c|-s)
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echo "$2" > "$3"
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;;
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-a)
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echo "$2" >> "$3"
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;;
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esac
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echo "ok"
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return 0
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fi
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if [ $confMode == "-s" ] ; then
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# if skip is selected, don't try to backup but add confilict entry
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echo "skipping (exists)"
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else
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# try backup existing config
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if [ ! -f "$3".bck ] ; then
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cp -ar "$3" "$3".bck
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if [ $confMode == "-c" ] ; then
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echo "$2" > "$3"
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else
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echo "$2" >> "$3"
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fi
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echo -e "ok \n[WARN] Existing config saved to ${3}.bck"
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return 0
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else
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echo "nok (backup exists)"
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fi
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fi
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else
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echo "nok (no change requested)"
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fi
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# add configuration to missingConf file
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if [ "$missingDate" = "" ] ; then
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missingDate=set
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echo -n "### " >> "$MISSING_CONF"
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date >> "$MISSING_CONF"
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fi
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echo "#--- $3 ---" >> "$MISSING_CONF"
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echo "$2" >> "$MISSING_CONF"
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echo >> "$MISSING_CONF"
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echo "[WARN] Check $(realpath "$MISSING_CONF") for configuration conflicts ($3)"
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return 1
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}
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# execute [-q] <Step Number>
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# -q: don't stop and don't report step functions which cannot be found
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# execute given step_<Step Number> function
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execute() {
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local NOTFOUND=0
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local NOREPORT=0
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if [ $1 == "-q" ] ; then
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NOREPORT=1
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shift
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fi
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# check if step function exists
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declare -F step_$1 &>>/dev/null || NOTFOUND=1
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if [ $NOTFOUND -eq 1 ] && [ $NOREPORT -ne 1 ] ; then
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echo "Step $1 not found"
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exit 1;
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fi
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# don't execute step functions which are not available
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if [ $NOTFOUND -eq 1 ] ; then
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return $NOTFOUND
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fi
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echo -en "\n[STEP $1] "
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existsFunction step_${1}_info
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if [ $? -eq 0 ] ; then
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step_${1}_info $1
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fi
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if [ $QUIET -ne 1 ] ; then
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read -p "Start: y/n(default)? " answer
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case $answer in
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[yY])
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step_$1 $1
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;;
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*)
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echo Aborting installation at step $1
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exit 1;
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;;
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esac
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else
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step_$1 $1
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fi
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}
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# checkStep <Step Number or Alias>
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# return 0 - for invalid step
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# Check sanitiy of step number or
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# Check if alias exists
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checkStep() {
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if (( $1 < 1 || $1 > $MAX_STEP )) ; then
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eval 'local ref=$alias_'$1
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if [ -z $ref ] || [ "$ref" == "$1" ] ; then
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return 0
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else
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return $ref
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fi
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else
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return $1
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fi
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}
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# continous <Starting Step Number>
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# (max $MAX_STEP)
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# execute installation continously from given starting step
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continous() {
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local step=0
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checkStep $1
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step=$?
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if [[ $step == 0 ]] ; then
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return 1
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fi
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for ((i=$step; i<=${MAX_STEP}; i++)); do
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execute -q $i
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local res=$?
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if [ $res -ne 0 ] ; then
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break;
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fi
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done
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}
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# selection <Step Number List (separated by space)>
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# execute given step list
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# e.g.: selection -q 1 4 12
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selection() {
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local step=0
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for i in $@ ; do
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checkStep $i
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step=$?
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# stop on step 0
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if [ $step -eq 0 ] ; then
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break
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else
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execute $step
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fi
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done
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}
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# Creating a minimal step definition template
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createTemplate() {
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if [ -f $TEMPLATE_NAME ] ; then
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return 1
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fi
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echo "#!/bin/bash" > $TEMPLATE_NAME
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echo >> $TEMPLATE_NAME
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echo "# Step 1 is mandatory" >> $TEMPLATE_NAME
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echo "step_1_info() { echo \"My custom step \$1\"; }" >> $TEMPLATE_NAME
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echo "step_1_alias() { ALIAS=\"begin\"; }" >> $TEMPLATE_NAME
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echo "step_1() {" >> $TEMPLATE_NAME
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echo " echo \"Doing something...\"" >> $TEMPLATE_NAME
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echo "}" >> $TEMPLATE_NAME
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echo >> $TEMPLATE_NAME
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echo "VERSION_SEQREV=${VERSION_REV}" >> $TEMPLATE_NAME
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echo ". $0" >> $TEMPLATE_NAME
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chmod +x $TEMPLATE_NAME
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return 0
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}
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# Parse alias functions "step_[STEP NUBER]_alias" to create
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# back reference variable of schema:
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# alias_[ALIAS]=[STEP NUMBER]
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parseAlias() {
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for ((i=1; i<=${MAX_STEP}; i++)); do
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# Check for alias definition
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existsFunction step_${i}_alias
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if [ $? -ne 0 ] ; then
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continue
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fi
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# Function writes global ALIAS variable
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step_${i}_alias
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eval 'alias_'$ALIAS'='$i
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done
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}
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# Always display sequencer help and, if available, sequence help
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displayHelp() {
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helpSequencer
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# check if step definition exists by looking for step_1()
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existsFunction step_1
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if [ $? -ne 0 ] ; then
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echo -e "\n It seems ${0##*/} was called directly."
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echo -e " Please create a sequence script first.\n"
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read -p " Create a template now? y/n(default)? " answer
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case $answer in
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[yY])
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createTemplate
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if [ $? -eq 0 ] ; then
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echo -e "\n $TEMPLATE_NAME created."
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else
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echo -e "\n $TEMPLATE_NAME exists...Nothing to do!"
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fi
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;;
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*)
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echo -e "\n Nothing to do!"
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;;
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esac
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exit 1;
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else
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echo " Step (= alias) documentation:"
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for ((i=1; i<=${MAX_STEP}; i++)); do
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# Display step reference in help if step function exists
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existsFunction step_${i}
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if [ $? -ne 0 ] ; then
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continue
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fi
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printf ' Step %3s ' $i
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# Display alias if exists
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existsFunction step_${i}_alias
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if [ $? -eq 0 ] ; then
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step_${i}_alias
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echo " = $ALIAS"
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printf ' : '
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else
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echo -n " : "
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fi
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# Display step help only if info function exists
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existsFunction step_${i}_info
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if [ $? -eq 0 ] ; then
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step_${i}_info $i
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else
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echo " - step_${i}_info() missing"
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fi
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done
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fi
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}
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# showVersion
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showVersion() {
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echo "Sequencer ${VERSION_STRING}"
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echo -n "Seq Revision "
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if [ ! -z "${VERSION_SEQREV}" ] ; then
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echo "${VERSION_SEQREV}"
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else
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echo "-"
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fi
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}
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exe() {
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local arr=("$@")
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if [ $DRY -ne 0 ] ; then
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echo "-- ${arr[@]}"
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elif [ $VERBOSE -eq 1 ] ; then
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(set -x; "${arr[@]}")
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else
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"${arr[@]}"
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fi
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}
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# Handle dry run and verbose output for commands containing pipe and/or redirects
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# exep <COMMAND TO RUN AS STRING>
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exep() {
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if [ $DRY -ne 0 ] ; then
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echo "-- $1"
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elif [ $VERBOSE -eq 1 ] ; then
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echo "++ $1"
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fi
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if [ $DRY -eq 0 ] ; then
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bash -c "$1"
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fi
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}
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main() {
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local START=0
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# options check
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for arg in "$@" ; do
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case "$arg" in
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--dry-run|-d) # shows what would be done
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DRY=1
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QUIET=1
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shift
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;;
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--help|-h) # show only help
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displayHelp
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exit 0;
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;;
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--quiet|-q) # detect if option quiet is available
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QUIET=1
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shift
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;;
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--verbose|-v) # set verbose flag
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VERBOSE=1
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shift
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;;
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--version) # version request
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showVersion
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exit 0;
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;;
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esac
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done
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if [ -z $1 ] || [ "$1" == "" ] ; then
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# Empty -> show help
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displayHelp
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# Assume starting at one for interactive mode
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START=1
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fi
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# compatibility check of sequence
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if [ ! -z $VERSION_SEQREV ] && [ $VERSION_SEQREV -gt $VERSION_REV ] ; then
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echo "[ERROR] Unsupported sequence revision"
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showVersion
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exit 1
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fi
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# exclude older versions if needed
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if [ ! -z $VERSION_SEQREV ] && [ $VERSION_SEQREV -lt 3 ] ; then
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echo "[ERROR] Unsupported sequence revision (addConf)"
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showVersion
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exit 1
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fi
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if [ -z $VERSION_SEQREV ] ; then
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echo -e "[WARNING] No sequence revision found. Trying anyway...\n";
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fi
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# check for starting step
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if [ ! -z "$1" ] ; then
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START=$1
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else
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# End here on quiet mode and no step was given
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if [ $QUIET -eq 1 ] ; then
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exit 1;
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fi
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fi
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if [ $DRY -ne 0 ] ; then
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echo
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echo "[WARN] Dry run active."
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echo " Printed commands may not be accurate (e.g. quotation incorrect)"
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echo " Sequence may ignore dry run"
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read -p "Press enter to continue or Ctrl + c to abort"
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fi
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parseAlias
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# check if more than one step is given and select execution mode
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if [ ! -z $2 ] ; then
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selection $@
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else
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continous $START
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fi
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echo
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echo "${0##*/} finished"
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}
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main "$@"
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exit 0;
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