add systemd integration example

contrib/systemd/Makefile

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+install:
+	install sist2-update-all.sh /usr/bin/sist2-update-all.sh
+	install sist2-update-files.sh /usr/bin/sist2-update-files.sh
+	install sist2-update-nextcloud.sh /usr/bin/sist2-update-nextcloud.sh
+	install sist2-update.service /etc/systemd/system/sist2-update.service
+	install sist2-update.timer /etc/systemd/system/sist2-update.timer
+	systemctl daemon-reload

contrib/systemd/README.md

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+# Systemd integration example
+
+This example contains my (yatli) personal configuration for sist2 auto-updating.
+The following indices are involved in this configuration:
+
+| Index     | Path             | Description                                |
+|-----------|------------------|--------------------------------------------|
+| files     | /zpool/files     | Main file repository                       |
+| nextcloud | /zpool/nextcloud | Externally synchronized to a cloud account |
+
+The systemd integration achieves automatic sist2 scanning & indexing everyday at 3:00AM.
+
+### Tailoring the configuration for yourself
+
+`sist2-update-all.sh` calls update scripts for each sist2 index. Add or remove
+update scripts accordingly to suit your need. Each update script (e.g.
+`sist2-update-files.sh`) has important parameters laid down at the beginning so
+make sure to edit them to point to your files and index locations.
+
+### Installation
+
+```bash
+# install the services and scripts
+sudo make install
+# enable & start the timer
+sudo systemctl enable sist2-update.timer
+sudo systemctl start sist2-update.timer
+# verify that the timer has been enabled
+systemctl list-timers --all
+```
+

contrib/systemd/sist2-update-all.sh

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+#!/bin/bash
+set -e
+__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+echo "Update index: Files"
+source ${__dir}/sist2-update-files.sh
+echo "Update index: Nextcloud"
+source ${__dir}/sist2-update-nextcloud.sh
+echo "Done. Restarting sist2."
+docker restart sist2-sist2-1

contrib/systemd/sist2-update-files.sh

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+#!/bin/bash
+set -e
+DATE=$(date +%Y_%m_%d)
+CONTENT=/zpool/files
+ORIG=/mnt/ssd/sist-index/files.idx
+NEW=/mnt/ssd/sist-index/files_$DATE.idx
+EXCLUDE='ZArchives|TorrentStore|TorrentDownload|624f0c59-1fef-44f6-95e9-7483296f2833|ubuntu-full-2021-12-07'
+NAME=Files
+#REWRITE_URL="http://localhost:33333/activate?collection=$NAME&path="
+REWRITE_URL=""
+
+sist2 scan \
+  --threads 14 \
+  --mem-throttle 32768 \
+  --quality 1.0 \
+  --name $NAME \
+  --ocr-lang=eng+chi_sim \
+  --ocr-ebooks \
+  --ocr-images \
+  --exclude=$EXCLUDE \
+  --rewrite-url=$REWRITE_URL \
+  --incremental=$ORIG \
+  --output=$NEW \
+  $CONTENT
+echo ">>> Scan complete"
+rm -rf $ORIG
+mv $NEW $ORIG 
+
+unset http_proxy
+unset https_proxy
+unset HTTP_PROXY
+unset HTTPS_PROXY
+sist2 index $ORIG --incremental=yes
+echo ">>> Index complete"

contrib/systemd/sist2-update-nextcloud.sh

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+#!/bin/bash
+set -e
+DATE=$(date +%Y_%m_%d)
+CONTENT=/zpool/nextcloud/v-yadli
+ORIG=/mnt/ssd/sist-index/nextcloud.idx
+NEW=/mnt/ssd/sist-index/nextcloud_$DATE.idx
+EXCLUDE='Yatao|.*263418493\\/Image\\/.*'
+NAME=NextCloud
+# REWRITE_URL="http://localhost:33333/activate?collection=$NAME&path="
+REWRITE_URL=""
+
+sist2 scan \
+  --threads 14 \
+  --mem-throttle 32768 \
+  --quality 1.0 \
+  --name $NAME \
+  --ocr-lang=eng+chi_sim \
+  --ocr-ebooks \
+  --ocr-images \
+  --exclude=$EXCLUDE \
+  --rewrite-url=$REWRITE_URL \
+  --incremental=$ORIG \
+  --output=$NEW \
+  $CONTENT
+echo ">>> Scan complete"
+rm -rf $ORIG
+mv $NEW $ORIG 
+
+unset http_proxy
+unset https_proxy
+unset HTTP_PROXY
+unset HTTPS_PROXY
+sist2 index $ORIG --incremental=yes

contrib/systemd/sist2-update.service

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+[Unit]
+Description=sist2-update
+
+[Service]
+User=yatli
+ExecStart=/bin/bash /usr/bin/sist2-update-all.sh

contrib/systemd/sist2-update.timer

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+[Unit]
+Description=sist2-update
+
+[Timer]
+OnCalendar=*-*-* 3:00:00
+Persistent=true
+Unit=sist2-update.service
+
+[Install]
+WantedBy=timers.target