printf "\e]2;YOUR TITLE GOES HERE\a"
https://unix.stackexchange.com/questions/177572/how-to-rename-terminal-tab-title-in-gnome-terminal
ChromeOS – removing SSH known_hosts from Chromebook
This is a repost of here, so I can find it fast…
The short of it: CTRL+Shift+J, then type
term_.command.removeKnownHostByIndex(INDEX);
Screenly OSE install notes
For: Sprint 9
install
Download OS here: https://github.com/screenly/screenly-ose/releases
Instructions to burn image here: https://www.raspberrypi.org/documentation/installation/installing-images/linux.md
the short of it is (lsblk to get the right device…):
unzip -p 2019-04-27-Screenly-OSE.zip | dd of=/dev/sdc bs=4M status=progress conv=fsync
Install instructions here: https://www.screenly.io/ose/ Use Option 1.
run:
sudo raspi-config
to change hostname and many other things.
Wi-Fi
To use the Screenly Wi-Fi UI you need a laptop handy to trigger a Wi-Fi reset and a keyboard to reboot, unless you want to cord-yank. The command line tools recommended for Raspbian Lite don’t work with Screenly. This is because Screenly uses NetworkManager. Use nmcli instead.
nmcli c delete ScreenlyOSE-gavf # to turn hotspot off # substitute the name of yours... nmcli device wifi rescan # scan - nothing printedscript nmcli device wifi list # show available AP's nmcli --ask device wifi connect SSID nmcli device status # show network status nmcli connection show # show configured connections # switch connections nmcli -p con up connection-name - usually SSID
Which wireless network? (Old but good.)
iwgetid
display rotation and offset
Edit /boot/config.txt.
# uncomment this if your display has a black border of unused pixels visible # and your display can output without overscan disable_overscan=1 # uncomment the following to adjust overscan. Use positive numbers if console # goes off screen, and negative if there is too much border overscan_left=-31 overscan_right=-31 overscan_top=-31 overscan_bottom=-31 ... # rotate display display_hdmi_rotate=3
display_hdmi_rotate result 0 no rotation 1 rotate 90 degrees clockwise 2 rotate 180 degrees clockwise 3 rotate 270 degrees clockwise 0x10000 horizontal flip 0x20000 vertical flip see: https://www.raspberrypi.org/documentation/configuration/config-txt/video.md
ssh and firewall
Enable ssh if you wish (like any other system.)
Ditto firewall.
#!/bin/bash # firewall setup rules... /usr/sbin/ufw enable /usr/sbin/ufw allow some-port/tcp /usr/sbin/ufw allow https /usr/sbin/ufw default allow outgoing /usr/sbin/ufw default deny incoming /usr/sbin/ufw logging off /usr/sbin/ufw status verbose # or numbered
ssl
See here https://support.screenly.io/hc/en-us/articles/212107306-Does-Screenly-OSE-support-SSL-
$ cd ~/screenly $ git pull # this step is not needed for later versions $ ./bin/enable_ssl.sh
auth
(user name and password). See https://support.screenly.io/hc/en-us/articles/115004422954-How-do-I-enable-authentication-in-Screenly-OSE-
Edit /home/pi/.screenly/screenly.conf No quotes.
[auth] password = some_password user = some_user
Afterwards pkill -f serever.py to restart server.
turn monitor off
With our Samsung LH32DCE /usr/bin/vcgencmd display_power 0 in the pi user’s crontab worked.
Set the timezone to make this easy… dpkg-reconfigure tzdata
convert pdf to jpg
http://xmodulo.com/convert-pdf-files-to-jpg-format-on-linux.html and scroll down a bit.
gs -dNOPAUSE -sDEVICE=jpeg -dFirstPage=1 -dLastPage=1 -sOutputFile=output%d.jpg -dJPEGQ=100 -r127 -q intput.pdf -c quit
To get the -r number, divide the screen width in px by the pdf width in inches, 1080/8.5 in the case of a flyer, 1080/20.25 ~=54 in the case of a calendar.
Add -dTextAlphaBits=4 -dGraphicsAlphaBits=4 for anti-aliasing.
cloning screens
Clone script,sync.sh on clone:
#!/bin/bash /usr/bin/rsync -az --delete pi@master_screen:screenly_assets/ screenly_assets /usr/bin/rsync -az pi@master_screen:.screenly/screenly.db .screenly
crontab on clone:
# clone
*/5 * * * * /home/pi/sync.sh
.ssh/config on clone:
Host master_screen
Port some_port
Modifications to viewer.py (on clone) to enable reconnecting to database:
--- viewer.py.orig 2019-04-27 04:42:45.614203993 -0400
+++ viewer.py 2019-07-17 12:06:34.462002313 -0400
@@ -174,6 +174,12 @@
time_cur = datetime.utcnow()
logging.debug('refresh: counter: (%s) deadline (%s) timecur (%s)', self.counter, self.deadline, time_cur)
if self.get_db_mtime() > self.last_update_db_mtime:
+ # testing: reload database
+ global db_conn
+ if db_conn != None:
+ db_conn.close()
+ db_conn = db.conn(settings['database'])
+ #
logging.debug('updating playlist due to database modification')
self.update_playlist()
elif settings['shuffle_playlist'] and self.counter >= 5:
@@ -183,12 +189,15 @@
def update_playlist(self):
logging.debug('update_playlist')
- self.last_update_db_mtime = self.get_db_mtime()
+ # mtime save was here
(new_assets, new_deadline) = generate_asset_list()
- if new_assets == self.assets and new_deadline == self.deadline:
+ # added check to db_mtime
+ if new_assets == self.assets and new_deadline == self.deadline and self.last_update_db_mtime == self.get_db_mtime():
# If nothing changed, don't disturb the current play-through.
+ self.last_update_db_mtime = self.get_db_mtime()
return
+ self.last_update_db_mtime = self.get_db_mtime()
self.assets, self.deadline = new_assets, new_deadline
self.counter = 0
# Try to keep the same position in the play list. E.g. if a new asset is added to the end of the list, we
validate-rsync on master screen:
#!/bin/bash if [ "$SSH_ORIGINAL_COMMAND" == "rsync --server --sender -logDtprze.iLsfxC . screenly_assets/" -o "$SSH_ORIGINAL_COMMAND" == "rsync --server --sender -logDtprze.iLsfxC . .screenly/screenly.db" ] then $SSH_ORIGINAL_COMMAND else echo "failed `date` $SSH_ORIGINAL_COMMAND" >>/home/pi/soc fi
.ssh/authorized_keys on master screen:
command="/home/pi/validate-rsync" ssh-rsa A...
why isn’t there any documentation installed in the image or with new packages?
This file /etc/dpkg/dpkg.cfg.d/01_nodoc prevents installation of documentation. I don’t know if documentation for already installed packages would be installed if this file were removed.
upgrade notes
Clients first.
- update one client on extra box.
- modify database if needed on client, see script below.
- swap extra box with production.
- same with other client.
- server on temp box.
- swap.
- update server.
- swap.
Don’t forget SSL, password on UI for clients.
# add column to database /usr/bin/sqlite3 /home/pi/.screenly/screenly.db "alter table assets add column skip_asset_check integer default 0;"