#!/usr/bin/env bash
# set -x

sudo apt install -y \
  sanoid
#	git \
#	dh-make \
#	libconfig-inifiles-perl \

echo "sanoid provides: sanoid, syncoid, findoid in /usr/sbin"
echo "defaults are in /usr/share/sanoid/sanoid.defaults.conf"
echo "override them in /etc/sanoid/sanoid.conf"

echo "Installed files:"
cat <<-EOF
	syncoid                     /usr/sbin/
	sanoid                      /usr/sbin/
	findoid                     /usr/sbin/
	sanoid.defaults.conf        /usr/share/sanoid/
	debian/sanoid-prune.service /lib/systemd/system
	CHANGELIST /usr/share/doc/sanoid/changelog
EOF

# Cronjob for non-systemd systems: every 15 minutes.
# If you require a different interval, you will need to disable the
# timer or the cron job according to your system configuration.
conf_print_sanoid_cron() {
  cat <<-EOF
		PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

		*/15 * * * * root [ -f /etc/sanoid/sanoid.conf ] && if [ ! -d /run/systemd/system ]; then TZ=UTC /usr/sbin/sanoid --cron --quiet; fi
EOF
}
conf_print_sanoid_cron | sudo tee /etc/cron.d/sanoid

# Do the same for syncoid for backups.
conf_print_syncoid_cron() {
  cat <<-EOF
		PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

		*/15 * * * * root [ -f /etc/sanoid/syncoid.conf ] && if [ ! -d /run/systemd/system ]; then TZ=UTC /usr/sbin/syncoid --cron --quiet; fi
EOF
}
# conf_print_syncoid_cron | sudo tee /etc/cron.d/syncoid

# Copied from /usr/share/doc/sanoid/example.conf
sudo mkdir -p /etc/sanoid/

conf_print_sanoid() {
  cat <<-EOF
    [rpool/docker]
    use_template = ignore

    [rpool/archive]
    use_template = ignore

    [rpool/swap]
    use_template = ignore

    [rpool/tmp]
    use_template = ignore

    [rpool/ROOT/devuan-1]
    use_template = root
    recursive = yes

    # rpool/ROOT/devuan-1/opt
    # rpool/ROOT/devuan-1/usr
    # rpool/ROOT/devuan-1/usr_local
    # rpool/ROOT/devuan-1/usr_share
    # rpool/ROOT/devuan-1/var
    # rpool/ROOT/devuan-1/var_lib

  	# Specific override for Virtual Machines to use scripts
    [rpool/ROOT/devuan-1/var_lib_virt]
    use_template = root
  	recursive = no
    pre_snapshot_script = /usr/local/bin/virt-freeze-all.sh
    post_snapshot_script = /usr/local/bin/virt-thaw-all.sh

  	# -- User Data --
    [rpool/home]
    use_template = production
    recursive = yes

    [rpool/space]
    use_template = production

    #############################
    # templates below this line #
    #############################

    [template_production]
    frequently = 0
    hourly = 36
    daily = 30
    monthly = 3
    yearly = 0
    autosnap = yes
    autoprune = yes

    [template_root]
    # Root changes fast; shorter history often suffices
    hourly = 24
    daily = 7
    monthly = 1
    yearly = 0
    autosnap = yes
    autoprune = yes

    [template_ignore]
    autoprune = no
    autosnap = no
    monitor = no

		[template_backup]
    autoprune = yes
    frequently = 0
    hourly = 30
    daily = 90
    monthly = 12
    yearly = 0

    ### don't take new snapshots - snapshots on backup
    ### datasets are replicated in from source, not
    ### generated locally
    autosnap = no

    ### monitor hourlies and dailies, but don't warn or
    ### crit until they're over 48h old, since replication
    ### is typically daily only
    hourly_warn = 2880
    hourly_crit = 3600
    daily_warn = 48
    daily_crit = 60

    [template_hotspare]
    autoprune = yes
    frequently = 0
    hourly = 30
    daily = 90
    monthly = 3
    yearly = 0

    ### don't take new snapshots - snapshots on backup
    ### datasets are replicated in from source, not
    ### generated locally
    autosnap = no

    ### monitor hourlies and dailies, but don't warn or
    ### crit until they're over 4h old, since replication
    ### is typically hourly only
    hourly_warn = 4h
    hourly_crit = 6h
    daily_warn = 2d
    daily_crit = 4d

    [template_scripts]
    ### information about the snapshot will be supplied as environment variables,
    ### see the README.md file for details about what is passed when.
    ### run script before snapshot
    pre_snapshot_script = /path/to/script.sh
    ### run script after snapshot
    post_snapshot_script = /path/to/script.sh
    ### run script before pruning snapshot
    pre_pruning_script = /path/to/script.sh
    ### run script after pruning snapshot
    pruning_script = /path/to/script.sh
    ### don't take an inconsistent snapshot (skip if pre script fails)
    #no_inconsistent_snapshot = yes
    ### run post_snapshot_script when pre_snapshot_script is failing
    #force_post_snapshot_script = yes
    ### limit allowed execution time of scripts before continuing (<= 0: infinite)
    script_timeout = 5
EOF
}
conf_print_sanoid | sudo tee /etc/sanoid/sanoid.conf

# Both sanoid and synmcoid are oneshot processes so it makes little sense to
# provide an init file, cron is just fine. In this case the systemd file is there
# because systemd decided to manage cron tasks.
# Generated using:
# https://raw.githubusercontent.com/akhilvij/systemd-to-sysvinit-converter/master/converter.py
# python2 converter /usr/src/sanoid-2.2.0/sanoid.service > sanoid
conf_print_sanoid_init() {
  cat <<-'EOF'
    #!/bin/sh
    ### BEGIN INIT INFO
    # Provides: sanoid
    # Required-Start: $syslog $local_fs $remote_fs 
    # Required-Stop:  $syslog $local_fs $remote_fs 
    # Default-Start: 2 3 4 5
    # Default-Stop: 0 1 6
    # Short-Description: Snapshot ZFS filesystems
    ### END INIT INFO

    . /lib/lsb/init-functions
    prog=sanoid
    PIDFILE=/var/run/$prog.pid
    DESC="Snapshot ZFS filesystems"
    start() {
      log_daemon_msg "Starting $DESC" "$prog"
      start_daemon -p $PIDFILE /usr/sbin/sanoid --take-snapshots --verbose
      if [ $? -ne 0 ]; then
        log_end_msg 1
        exit 1
      fi
      if [ $? -eq 0 ]; then
        log_end_msg 0
      fi
      exit 0
    }

    stop() {
      log_daemon_msg "Stopping $DESC" "$prog"
      killproc -p $PIDFILE /usr/sbin/sanoid
      if [ $? -ne 0 ]; then
        log_end_msg 1
        exit 1
      fi
      if [ $? -eq 0 ]; then
        log_end_msg 0
      fi
    }

    force_reload() {
      stop
      start
    }

    case "$1" in
      start)
        start
  ;;
      stop)
        stop
        ;;
      force-reload)
        force_reload
        ;;
      restart)
        stop
        start
        ;;

      *)
        echo "$Usage: $prog {start|stop|force-reload|restart}"
        exit 2
    esac
EOF
}
# Sandoid doesn't ran as a daemon it runs vi cron
# conf_print_sanoid_init | sudo tee /etc/init.d/sanoid
# sudo chmod +x /etc/init.d/sanoid

# Generated using:
# https://raw.githubusercontent.com/akhilvij/systemd-to-sysvinit-converter/master/converter.py
# python2 converter /usr/src/sanoid-2.2.0/sanoid-prune.service > sanoid-prune
conf_print_sanoid-prune_init() {
  cat <<-'EOF'
    #!/bin/sh
    ### BEGIN INIT INFO
    # Provides: sanoid-prune
    # Required-Start: $syslog $local_fs $remote_fs 
    # Required-Stop:  $syslog $local_fs $remote_fs 
    # Short-Description: Prune ZFS snapshots
    ### END INIT INFO

    . /lib/lsb/init-functions
    prog=sanoid-prune
    PIDFILE=/var/run/$prog.pid
    DESC="Prune ZFS snapshots"
    start() {
      log_daemon_msg "Starting $DESC" "$prog"
      start_daemon -p $PIDFILE /usr/sbin/sanoid --prune-snapshots --verbose
      if [ $? -ne 0 ]; then
        log_end_msg 1
        exit 1
      fi
      if [ $? -eq 0 ]; then
        log_end_msg 0
      fi
      exit 0
    }

    stop() {
      log_daemon_msg "Stopping $DESC" "$prog"
      killproc -p $PIDFILE /usr/sbin/sanoid
      if [ $? -ne 0 ]; then
        log_end_msg 1
        exit 1
      fi
      if [ $? -eq 0 ]; then
        log_end_msg 0
      fi
    }

    force_reload() {
      stop
      start

    }

    case "$1" in
      start)
        start
        ;;
      stop)
        stop
        ;;
      force-reload)
        force_reload
        ;;
      restart)
        stop
        start
        ;;

      *)
        echo "$Usage: $prog {start|stop|force-reload|restart}"
        exit 2
    esac
EOF
}
# Sandoid doesn't ran as a daemon it runs vi cron
# conf_print_sanoid-prune_init | sudo tee /etc/init.d/sanoid-prune
# sudo chmod +x /etc/init.d/sanoid-prune

# Give sudo access to virsh or is part of the libvirt group.
# qemu-guest-agent must be running in the vm
conf_print_virt_freeze() {
  cat <<'EOF'
#!/bin/sh
# /usr/local/bin/virt-freeze.sh

VM_NAME="$1"

if [ -z "$VM_NAME" ]; then
    echo "Usage: $0 <domain_name>"
    exit 1
fi

# Check if the VM is running
STATE=$(virsh domstate "$VM_NAME" 2>/dev/null)
if [ "$STATE" != "running" ]; then
    echo "VM $VM_NAME is not running or does not exist. Skipping freeze."
    exit 0
fi

echo "Freezing filesystems for $VM_NAME..."
# domfsfreeze returns the number of frozen filesystems on success
if virsh domfsfreeze "$VM_NAME" > /dev/null; then
    echo "Successfully frozen $VM_NAME."
else
    echo "Error: Failed to freeze $VM_NAME. Ensure qemu-guest-agent is active."
    exit 1
fi
EOF
}
conf_print_virt_freeze | sudo tee /usr/local/bin/virt-freeze.sh
sudo chmod +x /usr/local/bin/virt-freeze.sh

#---

conf_print_virt_unfreeze() {
  cat <<'EOF'
#!/bin/sh
# /usr/local/bin/virt-unfreeze.sh

VM_NAME="$1"

if [ -z "$VM_NAME" ]; then
    echo "Usage: $0 <domain_name>"
    exit 1
fi

# Check if the VM is running
STATE=$(virsh domstate "$VM_NAME" 2>/dev/null)
if [ "$STATE" != "running" ]; then
    echo "VM $VM_NAME is not running. Skipping unfreeze."
    exit 0
fi

echo "Thawing filesystems for $VM_NAME..."
# domfsthaw returns the number of thawed filesystems on success
if virsh domfsthaw "$VM_NAME" > /dev/null; then
    echo "Successfully thawed $VM_NAME."
else
    echo "Error: Failed to thaw $VM_NAME."
    exit 1
fi
EOF
}
conf_print_virt_unfreeze | sudo tee /usr/local/bin/virt-unfreeze.sh
sudo chmod +x /usr/local/bin/virt-unfreeze.sh

#---

conf_print_virt_thaw_all() {
  cat <<'EOF'
#!/bin/bash
# /usr/local/bin/virt-thaw-all.sh

# 1. Get running VM names, filtering out empty lines with awk
RUNNING_VMS=$(virsh list --state-running --name | awk 'NF')

if [ -z "$RUNNING_VMS" ]; then
    echo "No running VMs found."
    exit 0
fi

# 2. Loop through each running VM
for VM_NAME in $RUNNING_VMS; do
    echo "Processing $VM_NAME..."

    # Use the native thaw command. 
    # It handles the guest agent communication for you.
    if virsh domfsthaw "$VM_NAME" > /dev/null 2>&1; then
        echo "Successfully thawed $VM_NAME."
    else
        # If native fails, we capture the error for the user
        ERROR=$(virsh domfsthaw "$VM_NAME" 2>&1)
        echo "Error thawing $VM_NAME: $ERROR"
    fi
done

echo "Finished processing all VMs."
EOF
}
conf_print_virt_thaw_all | sudo tee /usr/local/bin/virt-thaw-all.sh
sudo chmod +x /usr/local/bin/virt-thaw-all.sh

#---

conf_print_virt_freeze-all() {
  cat <<'EOF'
#!/bin/bash

# 1. Get running VM names, filtering out empty lines
RUNNING_VMS=$(virsh list --state-running --name | awk 'NF')

if [ -z "$RUNNING_VMS" ]; then
    echo "No running VMs found."
    exit 0
fi

# 2. Loop through each running VM
for VM_NAME in $RUNNING_VMS; do
    echo "Attempting to freeze $VM_NAME..."

    # Using the native virsh command is generally cleaner
    # It returns the number of frozen filesystems on success
    if virsh domfsfreeze "$VM_NAME" > /dev/null 2>&1; then
        echo "Successfully frozen $VM_NAME."
    else
        echo "Error: Could not freeze $VM_NAME. Check if QEMU Guest Agent is running."
    fi
done

echo "Finished processing all VMs."
EOF
}
conf_print_virt_freeze-all | sudo tee /usr/local/bin/virt-freeze-all.sh
sudo chmod +x /usr/local/bin/virt-freeze-all.sh

#---

# exit 0
#
# # build a debian package from the git repo
# USER="jimsalterjrs"
# PROJECT="sanoid"
# LICENSE="mit"
# SECTION="admin"
# HOMEPAGE="https://openoid.net"
# BUILD_HOME="/var/tmp/sanoid-git_build"
# #VERSION="2.10.0"
# PACKAGE="sanoid"
# VERSION=$(curl "https://api.github.com/repos/${USER}/${PROJECT}/tags?per_page=5" | jq -r '.[0] | .name')
# VERSION=${VERSION:1} # strip the preceding 'v'
# DEBEMAIL="person@company.tld"
# DEBFULLNAME="Testy McTester"
# DESCRIPTION="Policy-driven snapshot management tool for ZFS filesystems."
# LONG_DESCRIPTION="Create, thin, and monitor snapshots and pool health from a single configuration file."
#
# RSS_FEED="https://github.com/${USER}/${PROJECT}/releases.atom"
# # xdg-open ${RSS_FEED}
# echo ${RSS_FEED}
#
# # Make the BUILD_HOME directory and clone upstream
# mkdir -p ${BUILD_HOME}
# cd ${BUILD_HOME} || exit
#
# git clone http://github.com/${USER}/${PROJECT}.git ${PACKAGE}-${VERSION}
#
# cd ${PACKAGE}-${VERSION} || exit
#
# mkdir -p m4
#
# cat <<EOF >.git/gbp.conf
# [DEFAULT]
# # this is the upstream-branch:
# upstream-branch=master
# EOF
#
# # debianize the BUILD_HOME directory
# echo ${DEBFULLNAME}
# dh_make \
#   --createorig \
#   --single \
#   --native \
#   --copyright ${LICENSE} \
#   --yes
#
# cp README.rst debian/README
# rm debian/README.source
#
# # Customize the debian directory values
# #sed -i 's,^\(Description: \).*,\1'${DESCRIPTION}',' debian/control
# sed -i "s,^\(Description: \).*,\1${DESCRIPTION}," debian/control
# sed -i 's,^\(Section: \).*,\1'${SECTION}',' debian/control
# sed -i "s,^\(Maintainer: \).*,\1'${DEBFULLNAME}\ \<${DEBEMAIL}\>'," debian/control
# sed -i 's,^\(Homepage: \).*,\1'${HOMEPAGE}',' debian/control
# sed -i "s/.*insert\ long.*/${LONG_DESCRIPTION}/" debian/control
#
# echo ****************
# cat debian/control
# echo ****************
#
# BUILD_OPTIONS=""
#
# cat <<EOF >debian/rules
# #!/usr/bin/make -f
# %:
# 	dh \$@
#
# override_dh_auto_configure:
# 	dh_auto_configure -- ${BUILD_OPTIONS}
# EOF
#
# cat <<'EOF' >debian/watch
# version=4
# opts=filenamemangle=s/.+\/v?(\d\S+)\.tar\.gz/${PROJECT}-$1\.tar\.gz/ \
#   http://github.com/${USER}/${PROJECT}/tags .*/v?(\d\S+)\.tar\.gz
# EOF
#
# cp -a packages/debian/* debian
#
# dpkg-buildpackage -us -uc -b
#
# echo ${PACKAGE}_${VERSION}_amd64.deb
#
# sudo dpkg -i ../${PACKAGE}_${VERSION}_amd64.deb
