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#!/usr/bin/ksh -p
# Copyright (c) 2013, 2023, Oracle and/or its affiliates.
#

#
# This is the method script for the svc:/application/pkg/mirror service
#
# When called using the 'start' or 'stop'  SMF method script, it adds
# or removes a crontab entry for the user running the service, pkg5srv
# by default.
#

#
# When called using the 'refresh' method, it runs pkgrecv(1) to update a
# pkg(7) repository using configuration stored in the SMF instance.
#
# The following SMF properties are used to configure the service:
#
# config/repository		the local pkg5 repository we update.
#
# config/ref_image		the reference pkg5 image that contains
#				origin information that we should update
#				from.
#
# config/publishers		a comma-separated list of the publishers
#				from ref_image that we pkgrecv from.
#
# config/crontab_period		the first five fields of a crontab(4)
#				entry, with the 3rd field allowing the
#				special value 'random'.
#
# config/debug			a boolean, 'true' or 'false'; whether
#				to log more output when debugging.
#

# Load SMF constants and functions
. /lib/svc/share/smf_include.sh
. /lib/svc/share/fs_include.sh
. /lib/svc/share/pkg5_include.sh

AWK=/usr/bin/awk
CAT=/usr/bin/cat
DATE=/usr/bin/date
GREP=/usr/bin/grep
PKG=/usr/bin/pkg
PKGRECV=/usr/bin/pkgrecv
PKGREPO=/usr/bin/pkgrepo
PYTHON=/usr/bin/python
RM=/usr/bin/rm
SED=/usr/bin/sed
SORT=/usr/bin/sort
SVCCFG=/usr/sbin/svccfg
SVCPROP=/usr/bin/svcprop
WC=/usr/bin/wc
ZFS=/usr/sbin/zfs

SVCNAME=svc:/application/pkg/mirror

#
# Since we deal with '*' values in crontab fields, we never want
# globbing.
#
set -o noglob

#
# Multiple instances of this service should not point at the
# same local repository, since they could step on each other's toes
# during updates, so we check for this before enabling the service.
#
# Usage:
#    check_duplicate_repos
#
function check_duplicate_repos {

ALL_REPOS=$($SVCPROP -p config/repository "$SVCNAME:*" \
	    | $AWK '{print $NF}' | $SORT | $WC -l)
	REPOS=$($SVCPROP -p config/repository "$SVCNAME:*" \
	    | $AWK '{print $NF}' | $SORT -u | $WC -l)
	#
	# if the unique list of repositories is not the same as the
	# list of repositories, then we have duplicates.
	#
	if [ "$ALL_REPOS" != "$REPOS" ]; then		
		return 1
	fi
	return 0
}

#
# In order that all instances don't hit the remote origins on the same
# day, when configured with a 'config/crontab_period' containing a
# special value 'random' in the 'day of the month' field of the crontab
# schedule, we randomize the day, choosing a value from 1-28, storing
# that to the service config instead. We then print the crontab period.
#
# Usage:
#    add_date_jitter
#
function add_date_jitter {

schedule=$($SVCPROP -p config/crontab_period $SMF_FMRI \
	    | $SED -e 's/\\//g')

#
	# Validate the cron_period property value, checking that we have
	# exactly 5 fields, and that 'random' only appears in the 3rd
	# field.  We leave other validation up to cron(1).
	#
	echo "$schedule" | $AWK '
		NF != 5 {
			print "config/crontab_period property must contain 5 " \
			    "values.";
			exit 1
		}
		$1 == "random" || $2 == "random" || $4 == "random" || \
		    $5 == "random" {
			print "only field 3 can have the value random";
			exit 1
		}'

check_failure $? "invalid value for config/crontab_period." \
	    $SMF_FMRI exit

RAND=$(( ($RANDOM % 27) + 1 ))
	new_schedule=$(echo "$schedule" | $SED -e "s/random/$RAND/1")
	if [ "$new_schedule" != "$schedule" ]; then
		#
		# Save the schedule in the instance. Note that this
		# will not appear in the running instance until the
		# refresh method has fired.
		#
		new_schedule=$(echo $new_schedule| $SED -e 's/ /\\ /g')
		$SVCCFG -s $SMF_FMRI setprop \
		    config/crontab_period = astring: "$new_schedule"
	fi
	print $new_schedule
}

#
# Add a crontab entry that does periodic pkgrecvs from a series of
# remote pkg5 origins to a local repository. This is run as part of the
# SMF start method for this service. If the repository doesn't exist,
# we create it.  We also attempt to create a zfs dataset if the parent
# directory for the repository is the leaf of a zfs dataset.
#
function smf_schedule_updates {

check_duplicate_repos
	check_failure $? "Two or more instances of $SVCNAME contain the
same 'config/repository' value, which is not supported." $SMF_FMRI exit
	typeset -f schedule=$(add_date_jitter | $SED -e 's/\\//g')
	typeset repo=$($SVCPROP -p config/repository $SMF_FMRI)

SAVED_IFS="$IFS"
	IFS=,
	set -A publishers $($SVCPROP -p config/publishers $SMF_FMRI)
	IFS="$SAVED_IFS"

if [ ! -f $repo/pkg5.repository ]; then
		repo_parent=$(dirname $repo)
		repo_base=$(basename $repo)
		readmnttab "$repo_parent" < /etc/mnttab
		if [ "$fstype" = "zfs" ]; then
			#
			# $special gets set by readmnttab in
			# /lib/svc/share/fs_include.sh
			#
			DS="$special/$repo_base"

#
			# We set canmount=noauto so that multiple bootable
			# rpools can coexist on the same system.
			#
			$ZFS create -o canmount=noauto "$DS"
			check_failure $? \
			    "unable to create zfs dataset $DS" \
			    $SMF_FMRI degrade
			$ZFS mount "$DS"
			check_failure $? \
			    "unable to mount zfs dataset $DS" \
			    $SMF_FMRI degrade
		fi
		$PKGREPO create "$repo"
		check_failure $? "unable to create repository" \
		    $SMF_FMRI degrade
	fi
	set_default_publisher "$repo" ${publishers[0]}
	add_cronjob $SMF_FMRI "$schedule" \
	    "/usr/sbin/svcadm refresh $SMF_FMRI"
}

#
# Remove the crontab entry that was added by 'schedule_updates'. This is
# run as part of the SMF stop method for this service.
#
function smf_unschedule_updates {

remove_cronjob $SMF_FMRI \
	    "/usr/sbin/svcadm refresh $SMF_FMRI"
}

#
# Checks whether the given repository has a publisher/prefix set,
# and if not, sets it to the given publisher.
#
# Usage:
#     set_default_publisher <path to repo> <publisher>
#
function set_default_publisher {
	typeset repo="$1"
	typeset pub=$2

DEFAULT=$($PKGREPO -s "$repo" get -H publisher/prefix | \
	    $AWK '{print $NF}')
	if [ "$DEFAULT" = '""' ]; then
		$PKGREPO -s "$repo" set publisher/prefix=$pub
	fi
}

#
# Intended to be called as part of a cron job firing, this calls
# 'pkgrecv_from_origin' for each publisher configured in the SMF
# instance.
#
# Usage: 
#     update_repository <smf fmri>
#
function update_repository {

typeset SMF_FMRI=$1
	typeset instance=$(echo $SMF_FMRI | $AWK -F: '{print $NF}')
	typeset lockfile=/system/volatile/pkg/mirror.$instance.lock

if [ -f $lockfile ]; then
		pid=$(<$lockfile)
		check_failure 1 "A mirror operation was already running
 under process $pid when the cron job fired. Remove $lockfile to
 override, or check the SMF property 'config/crontab_period' to ensure
 cron schedules don't overlap." $SMF_FMRI degrade
		return 1
	fi
	# write our pid into the lock file
	echo $$ > $lockfile
	check_failure $? "unable to create lockfile" $SMF_FMRI degrade

typeset repo=$($SVCPROP -p config/repository $SMF_FMRI \
	    | $SED -e 's/\\//g')
	typeset cachedir=$($SVCPROP -p config/cache_dir $SMF_FMRI \
	    | $SED -e 's/\\//g')
	typeset ref_image=$($SVCPROP -p config/ref_image $SMF_FMRI\
	    | $SED -e 's/\\//g')

SAVED_IFS="$IFS"
	IFS=,
	set -A publishers $($SVCPROP -p config/publishers $SMF_FMRI)
	IFS="$SAVED_IFS"
	if [ -z "$publishers" ]; then
		echo "ERROR: no publishers found in 'config/publishers'"
		return $SMF_EXIT_FATAL
	fi

set -A origins ""
	set -A ssl_keys ""
	set -A ssl_certs ""
	set -A http_proxies ""
	set -A https_proxies ""
	set -A clones ""
	set -A pubs ""

#
	# Gather the details we need to connect to the origins
	# we want to pkgrecv from.
	#
	i=0
	index=0
	while [ $i -lt ${#publishers[@]} ]; do
		pub=${publishers[$i]}
		# All origins for a publisher share the
		# same TLS client key/cert, even though
		# the pkg publisher output will show it for
		# each of them.
		sslkey=$($PKG -R $ref_image publisher $pub \
		    | $AWK -F ': ' \
		    '/SSL Key/ && $2 !~ /None/ { print $2 ; exit}')
		sslcert=$($PKG -R $ref_image publisher $pub \
		    | $AWK -F ': ' \
		    '/SSL Cert/ && $2 !~ /None/ { print $2 ; exit}')
		pubtmp=$(mktemp /tmp/pkg.mirror.XXXXXX)
		$PKG -R $ref_image publisher -F tsv > $pubtmp

#
		# this function depends on the output of
		# 'pkg publisher -F tsv'. It really ought to use
		# 'pkg publisher -o' option when that's available.
		#

first_index=$index
		while read publisher sticky syspub enabled ptype status \
		    uri proxy ; do
			if [ "$pub" != "$publisher" ]; then
				continue
			fi
			if [ -z "$uri" ]; then
				echo "WARNING: no URI \
configured for publisher $pub"
				continue
			fi
			# Only https:// origins need the key/cert
			if [ "${uri##https://}" != "$uri" ]; then
				ssl_keys[$index]=$sslkey
				ssl_certs[$index]=$sslcert
			else
				ssl_keys[$index]=''
				ssl_certs[$index]=''
			fi
			if [ "$proxy" = "-" ]; then
				proxy=''
			fi
			origins[$index]=$uri
			https_proxies[$index]=$proxy
			http_proxies[$index]=$proxy
			clones[$index]=""
			pubs[$index]=$pub
			index=$(( $index + 1 ))
		done < $pubtmp
		$RM $pubtmp
		i=$(( $i + 1 ))

# If only one origin for this publisher
		if [ $first_index -eq $(( $index - 1 )) ]; then
			clones[$first_index]="true"
		fi
	done

# Iterate over all configured origins
	i=0
	while [ $i -lt ${#origins[@]} ]; do
		origin=${origins[$i]}
		pub=${pubs[$i]}
		key=${ssl_keys[$i]}
		cert=${ssl_certs[$i]}
		http_proxy=${http_proxies[$i]}
		https_proxy=${https_proxies[$i]}
		clone=${clones[$i]}

pkgrecv_from_origin "$repo" "$origin" "$key" \
		    "$cert" $SMF_FMRI "$cachedir" "$http_proxy" \
		    "$https_proxy" "$clone" "$pub"
		check_failure $? \
		    "unable to update repository $repo" $SMF_FMRI \
		    degrade
		if [ $? -ne 0 ]; then
			$RM $lockfile
			return 1
		fi
		i=$(( $i + 1 ))
	done

EXIT=$?
	$RM $lockfile
	return $EXIT
}

#
# When retrieving values from SMF, we can get the string '""'
# (two quotes) returned.  For our purposes, this is equivalent to the
# null string, so we normalize it to ''. This function reads from stdin.
#
function reduce_null_str {
	while read value; do
		if [ "$value" = '""' ]; then
			echo ''
		else
			echo $value
		fi
	done
}

#
# Perform a pkgrecv from the given origin to the given repository.
# We assume that the repository exists.
#
# Usage:
#    pkgrecv_from_origin <repo> <origin> <key path> <cert path> <FMRI>
#			<cache dir> <http_proxy> <https_proxy>
#
function pkgrecv_from_origin {

typeset repo=$1
	typeset origin=$2
	typeset key=$(echo $3 | reduce_null_str)
	typeset cert=$(echo $4 | reduce_null_str)
	typeset SMF_FMRI=$5
	typeset cachedir=$6
	typeset http_proxy=$(echo $7 | reduce_null_str)
	typeset https_proxy=$(echo $8 | reduce_null_str)
	typeset clone=$9
	typeset publisher=${10}

typeset instance=$(echo $SMF_FMRI | $AWK -F: '{print $NF}')
	typeset debug_flag=$($SVCPROP -p config/debug $SMF_FMRI)
	typeset LOG=/var/log/pkg/mirror/mirror.$instance.log

export http_proxy=$http_proxy
	export https_proxy=$https_proxy

TSTAMP=$($DATE +%Y%m%dT%H%M%SZ)
	echo "$TSTAMP: $SMF_FMRI updates to $repo from $origin :" \
	    >> $LOG

if [ -n "$key" ] && [ -n "$cert" ]; then
		key="--key $key"
		cert="--cert $cert"
	fi
	
	set -f
	if [ -n "$clone" ]; then
		cmd="$PKGRECV -s $origin -d "$repo" -p $publisher \
		    $key $cert --clone"
	else
		cmd="$PKGRECV -s $origin -c "$cachedir"/$instance \
		    -d "$repo" -m all-timestamps $key $cert *"
	fi

# show the command we're running
	if [ "$debug_flag" = "true" ] ; then
		echo $cmd
	fi

$cmd > $LOG.tmp 2>&1
	set +f
	EXIT=$?

if [ "$debug_flag" = "true" ]; then
		$CAT $LOG.tmp >> $LOG
	elif [ $EXIT -ne 0 ]; then
		#
		# in the case of errors, getting the full pkgrecv output
		# can be helpful.
		#
		$CAT $LOG.tmp >> $LOG
	else
		# otherwise, we only log messages containing pkg5 FMRIs
		$GREP 'pkg:/' $LOG.tmp >> $LOG
		# we only destroy the cache if a pkgrecv was successful
		$RM -rf "$cachedir"/$instance
	fi
	$PKGREPO -s "$repo" refresh
	$RM $LOG.tmp
	return $EXIT
}

# $1 start | stop | an FMRI containing configuration
case "$1" in
'start')
	smf_schedule_updates
	if [ $? -eq 0 ]; then
	    result=$SMF_EXIT_OK
	else
	    echo "Problem mirroring repository for $SMF_FMRI"
	    result=$SMF_EXIT_ERR_FATAL
	fi
	;;

'stop')
	smf_unschedule_updates
	if [ $? -eq 0 ]; then
	    result=$SMF_EXIT_OK
	else
	    echo "Problem mirroring repository for $SMF_FMRI"
	    result=$SMF_EXIT_ERR_FATAL
	fi
	;;

#
# A note on logging.
#
# The following log files are created while this service is running:
#
# /var/log/pkg/mirror/mirror.<instance>.log
#	This is the top-level log file for the service. This log
#	shows a summary of each pkgrecv, listing a timestamp and the
#	packages that were received during that run of the cron job.
#
# /var/log/pkg/mirror/mirror.<instance>.run.<pid>
# 	This is a temporary log file, which should contain very little
#       output - it exists to capture all other output from the service
#	If 'config/debug' is set, then this file will also include the
#       full pkgrecv(1) command that is executed.
#
# /var/log/pkg/mirror/mirror.<instance>.log.tmp
#       Another temporary log file, which captures the complete output
#       of each pkgrecv command as it runs. At the end of the pkgrecv
#       process, we extract a summary and append it to
#	mirror.<instance>.log. If 'config/debug' is set, the contents
#       of this log are appended to mirror.<instance>.log. If any errors
#	were encountered while running pkgrecv, the contents of this log
#	are appended to mirror.<instance>.log.
#

'refresh')
	typeset instance=$(echo $SMF_FMRI | $AWK -F: '{print $NF}')
	typeset LOG=/var/log/pkg/mirror/mirror.$instance.log
	typeset debug_flag=$($SVCPROP -p config/debug $SMF_FMRI)
	typeset pkg_dir=/system/volatile/pkg

# Most output should get captured by update_repository, but we
	# capture any remaining output.
	mkdir -p $pkg_dir
	update_repository $SMF_FMRI > $LOG.run.$$ 2>&1
	RET=$?

if [ -s $LOG.run.$$ ]; then
		cat $LOG.run.$$ >> $LOG
	fi

if [ "$debug_flag" = "false" ]; then
		$RM $LOG.run.$$
	fi

if [ $RET -eq 0 ]; then
		result=$SMF_EXIT_OK
	else
		echo "Mirror refresh failed: see $LOG for more detail."
		# try to remove the cron job so we don't keep failing
		smf_unschedule_updates
		result=$SMF_EXIT_ERR_FATAL
	fi
	;;
esac

exit $result