Install

• boot: advanced options > expert install
• proceed until Load installer components..., then select f2fs-modules
• proceed until Partition disks, then:
  • /boot as ext4 (grub can't boot f2fs with extra_attr option)
  • / as ext4
  • swap
• select Execute a shell, then:

1
2
3
4
5
6
7
8
9
10
11
12
13
14

  df -hT   # show mounted device names
  umount /target/boot
  cp -a /target /tg
  umount /target
  anna-install f2fs-tools-udeb  # or anna-install f2fs-modules; depmod; modprobe f2fs
  mkfs.f2fs -l mylabel -f -i -O extra_attr,inode_checksum,sb_checksum,compression /dev/sdX2
  mount -t f2fs -o compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime /dev/sdX2 /target
  cp -a /tg/. /target
  blkid -s UUID -o value /dev/sdX2 >> /target/etc/fstab
  echo "compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime" >> /target/etc/fstab
  nano /target/etc/fstab # edit `/`: replace UUID, set type=f2fs, prepend options
  mount /dev/sdX1 /target/boot
  df -hT   # re-check mounted device names
  exit

• select Install the base system
• reboot
• grub (/etc/default/grub & update-grub)
  • timeout = 3 secondi
  • cmdline append rootflags=atgc

System backup

1
2
3
4
5
6
7
8
9
10
11
12
13
14

# 1. copy latest `busybox` into destination folder
#   in order to use `tar` and `gzip` applets

# 2.boot debian netinst cd > Advanced > Rescue mode > Execute a Shell
anna-install f2fs-modules
depmod
modprobe f2fs
mkdir src dst
mount -t f2fs -o ro /dev/sdX2 /src
mount -t f2fs /dev/mmcblk0p1 /dst
cd /dst 
./busybox tar -C /src --numeric-owner -cvpf - . | ./busybox gzip -c > backup.tgz
cd /
umount /src /dst

Source: davidsebek, archlinux, debian, kernel

1
2
3
4
5
6
7
8
9

# read speed
hdparm -t -T /dev/sda

# write speed: file on filesystem
dd if=/dev/zero of=/tmp/output conv=fdatasync bs=1M count=100; rm -f /tmp/output
dd if=/dev/zero of=/tmp/output bs=100M count=1 oflag=dsync   ; rm -f /tmp/output

# write speed on disk/partition (destructive!)
dd if=/dev/zero of=/dev/sdXY conv=fdatasync bs=1M count=100

Source: AskUbuntu

My current fonts:

Note: remember to enable color emoji!

Custom fonts installation on linux:

1. copy files in /usr/local/share/fonts or ~/.local/share/fonts
2. run sudo fc-cache -fv to update font config cache

See also dev.to discussion.

To see:

• SourceCodePro
• FiraCode -- apt install fonts-firacode / has ligatures
• Hasklig / has ligatures
• M+ 1m medium -- apt install fonts-mplus

Add-ons

• Always active Window -- utile per i corsi online da far scorrere in background
• Awesome Screen Recorder & Screenshot
• Dark Reader
• Download Image from Context Menu
• Get cookies.txt LOCALLY
• Keepa amazon tracker
• TamperMonkey
• User-Agent Switcher
• Video DownloadHelper -- hp

developer mode

Go to chrome://extensions/ / vivaldi://extensions/ and toggle developer mode switch.

Vivaldi

• Raspberry forum
• Raspberry tips

Command line options

1
2
3
4
5
6
7
8
9

# https://www.ghacks.net/2017/02/13/how-to-speed-up-the-vivaldi-web-browser/
# optimized command for raspberry pi
/usr/bin/vivaldi \
  --process-per-site \
  --enable-low-res-tiling \
  --enable-low-end-device-mode \
  --disk-cache-size=104857600 \
  --disk-cache-dir=$TMPD \
  "$@"

Delete undeletable cookies

If you can't delete them from Settings > Privacy and Security > Cookies:

• Open Site Settings (click on the lock in the address field and selecting the last menu item)
• Go back and filter the desired site
• Delete cookies and data storage

Fix passwords not syncing

If you observe the following error in vivaldi://sync

1
2

Error: CleanupPasswordStore@components/password_manager/core/browser/sync/password_sync_bridge.cc:1067,
datatype error was encountered: Failed to get encryption key during database cleanup.

1. close Vivaldi
2. rm -f ~/.config/vivaldi/Default/Login\ Data*
3. launch Vivaldi and the sync error in vivaldi://sync should have vanished

Video DRM/Widevine on Vivaldi

1

find ~/.config/vivaldi -type d -regex ".+\(GPU\|Graphite\|Shader\|Dawn\)Cache" -exec rm -rf "{}" +

obsolete instructions

• vivaldi://flags > Override software rendering list > Enable
• vivaldi://gpu
  • on Rpi5 disable chrome://flags/#disable-accelerated-video-decode
• vivaldi://components > Widevine Content Decryption Module > check if it's loaded

See: old script, vivaldi forum, test video, another test page

1
2

apt install libwidevinecdm0
echo '{"Path":"/opt/WidevineCdm"}' > ~/.config/vivaldi/WidevineCdm/latest-component-updated-widevine-cdm

install the server and move data

1. install baikal (PHP+sqlite/mysql)

   1 2 3 4

   unzip baikal-*.zip mkdir -p baikal/Specific/db chown -R nginx:www-data baikal/ find baikal/ -mindepth 1 -type d -exec chmod 775 "{}" \;

2. run it on nginx/apache + php-fpm via https

3. point the browser to your new server and complete the initial setup

4. add a user and his calendars

copy calendar and address book data

1. google calendar > export existing calendar to ics file
2. android > address book app > export to vcf file
3. thunderbird > calendar > add new > from internet > DAV > enter username and https://domain.ext/davp.php
4. thunderbird > calendar > import (from ics file to the new calendar)
5. android > install DAVx5 app via F-Droid, add your DAV account, check all desired items: this creates new accounts for calendar and address book
6. android > calendar app > select the new DAVx5 calendar
7. android > address book app > select the new DAVx5 account > settings > import > select the vcf file

tips

export all data to a single file

Just append ?export to the user calendar/addressbook url:

• https://domain.ext/dav.php/addressbooks///?export
• https://domain.ext/dav.php/calendars///?export

quickly generare an ID for a calendar

1

dd if=/dev/random count=1 bs=1M status=none | md5sum

share a calendar with another baikal user

See this post:

1. open calendar url: https://domain.ext/dav.php/calendars/<user>/<calendar_id>/
2. at the section Share this resource insert mailto:baikal_user_email

web UI

infcloud is a very nice cal&card html5+jquery client, use /dav.php/principals/ as the base url

calendari

• https://www.thunderbird.net/en-US/calendar/holidays/#I
• https://www.webcal.guru/it-IT/lista_eventi?calendar_id=holidays
• https://www.webcal.guru/it-IT/lista_eventi?calendar_id=holidays_good_to_know

See also: Dockerfile sample and blog post, clients list