YunoHost includes a hook mechanism triggered on a lot of operation changing the system. You can use this mechanism in order to extend the behaviour of a YunoHost command.
The most obvious case is adding a user. If you had a post_user_create hook, this hook will be triggered as soon as a user is added.
Below we imagine we want to run a command after each user creation to add the user to samba user.
You should create a directory with the name of the hooks into /etc/yunohost/hooks.d/:
mkdir -p /etc/yunohost/hooks.d/post_user_createNext create a bash script inside this directory prefixed by 2 numbers and a dash:
nano /etc/yunohost/hooks.d/post_user_create/05-add-user-to-sambaBy default, the directory must be readable and traversable by root, but if you notice your hook is not run at all by YunoHost, you can check permissions with ls -l /etc/yunohost/hooks.d/ and apply these commands if needed:
chown root:root /etc/yunohost/hooks.d/post_user_create
chmod u+rx /etc/yunohost/hooks.d/post_user_createIf you are packaging an app, you should not set by yourself the hook into /etc/yunohost/hooks.d instead you should create a hooks dir at the root of your package.
.
├── conf
├── hooks
├── scriptsIn the hooks dir, create a bash script called with the type of hook you want to create for example post_create_user.
This hook is run at the end of the command yunohost user create or equivalent action in webadmin.
#!/bin/bash
domain=$(cat /etc/hostname)
message="Hello $YNH_USER_FIRSTNAME,
Welcome on $domain !
Feel free to <a href='https://$domain/yunohost/sso/edit.html'>change your password</a>.
Let me know if you have a problem,
The admin of $domain
"
echo $message | mail -s "Welcome on $domain !" $YNH_USER_MAILThis hook is run at the end of the command yunohost user delete or equivalent action in webadmin.
#!/bin/bashThis hook is run at the end of the command yunohost user update or equivalent action in webadmin.
Only arguments given to the cli/api are given as environment variable.
#!/bin/bash
"
domain=$(cat /etc/hostname)
message="Hello,
Your password has been successfully changed on $domain.
If you have not asked for changing your password, you probably should contact the admin of $domain.
"
echo $message | mail -s "Your password has been changed on $domain !" $YNH_USER_USERNAMEThis hook is run at the end of the command yunohost user permission add or equivalent action in webadmin.
main, admin, etc.)This hook is run at the end of the command yunohost user permission remove or equivalent action in webadmin.
main, admin, etc.)This hook is run at the end of the command yunohost domain add or equivalent action in webadmin.
This hook is run at the end of the command yunohost domain remove or equivalent action in webadmin.
This hook is run at the end of the command yunohost domain cert update or equivalent action in webadmin.
#!/bin/bash
systemctl restart gemservThis hook is run at the end of the command yunohost domain dns suggest or equivalent action in webadmin.
Thanks to This hook you can customize
The script should return a JSON array with dictionnary in this format:
[
{
'type': 'SRV',
'name': 'stuff.foo.bar',
'value': 'yoloswag',
'ttl': 3600
}
]#!/bin/bash
if [[ "$1" == "XXXX.nohost.me" ]] ; then
echo "[
{
'type': 'TXT',
'name': '_acme-challenge',
'value': 'LETSENCRYPT_VALUE',
'ttl': 3600
}
]"
fi
This hook is run at the end of the command yunohost app change-url or equivalent action in webadmin.
This hook is run at the end of the command yunohost app upgrade or equivalent action in webadmin.
dpkg --print-architecture#!/bin/bash
source /usr/share/yunohost/helpers
app=$YNH_APP_INSTANCE_NAME
if [[ "$app" == "etherpad_mypads" ]]; then
ynh_write_var_in_file --file=/var/www/etherpad_mypads/settings.json --key=max --value=100 --after=importExportRateLimiting
systemctl restart etherpad_mypads
fi
This hook is run at the end of the command yunohost app install or equivalent action in webadmin.
dpkg --print-architectureThis hook is run at the end of the command yunohost app remove or equivalent action in webadmin.
dpkg --print-architectureThis hook is run at the end of the command yunohost backup create or equivalent action in webadmin.
#!/bin/bash
# Source YNH helpers
source /usr/share/yunohost/helpers
ynh_backup_dest (){
YNH_CWD="${YNH_BACKUP_DIR%/}/$1"
mkdir -p $YNH_CWD
cd "$YNH_CWD"
}
# Exit hook on subcommand error or unset variable
ynh_abort_if_errors
# MISC
ynh_backup_dest "conf/custom/misc"
ynh_backup "/etc/sysctl.d/noipv6.conf"
ynh_backup "/usr/local/bin/"
ynh_backup "/etc/yunohost/hooks.d/backup/99-conf_custom"
ynh_backup "/etc/yunohost/hooks.d/restore/99-conf_custom"
This hook is run at the end of the command yunohost backup restore or equivalent action in webadmin.
#!/bin/bash
# Source YNH helpers
source /usr/share/yunohost/helpers
ynh_restore_dest (){
YNH_CWD="${YNH_BACKUP_DIR%/}/$1"
cd "$YNH_CWD"
}
# Exit hook on subcommand error or unset variable
ynh_abort_if_errors
# MISC
ynh_restore_dest "conf/custom/misc"
ynh_restore_file "/etc/sysctl.d/noipv6.conf"
ynh_restore_file "/usr/local/bin/"
ynh_restore_file "/etc/yunohost/hooks.d/backup/99-conf_custom"
ynh_restore_file "/etc/yunohost/hooks.d/restore/99-conf_custom"
This hook is run during the command yunohost backup create or equivalent action in webadmin.
This hook is called several times with different action keywords.
#!/bin/bash
set -euo pipefail
work_dir="$2"
name="$3"
repo="$4"
size="$5"
description="$6"
case "$1" in
need_mount)
# Set false if your method can itself put files in good place in your archive
true
;;
backup)
mount /dev/sda1 /mnt/hdd
if [[ "$(df /mnt/hdd | tail -n1 | cut -d" " -f1)" != "/dev/sda1" ]]
then
exit 1
fi
pushd "$work_dir"
current_date=$(date +"%Y-%m-%d_%H:%M")
cp -a "${work_dir}" "/mnt/hdd/${current_date}_$name"
popd
umount /mnt/hdd
;;
*)
echo "hook called with unknown argument \`$1'" >&2
exit 1
;;
esac
exit 0
This hook is run at the end of the command yunohost firewall reload or equivalent action in webadmin.
#!/bin/bash
iptables -A OUTPUT -p tcp --dport 25 -m owner --uid-owner postfix -j ACCEPT
iptables -A OUTPUT -p tcp --dport 25 -m tcp -j REJECT --reject-with icmp-port-unreachableThis hook is run during the command yunohost tools regen-conf or equivalent action in webadmin.
This hook is called several times with different actions keywords (pre and post operations).
#!/bin/bash
action=$1
pending_dir=$4
postfix_conf=$pending_dir/../postfix/etc/postfix/main.cf
[[ "$action" == "pre" ]] || exit 0
[[ -e $postfix_conf ]] || exit 0
echo '
compatibility_level = 2' >> $postfix_confFound errors? Think you can improve this documentation? Simply click the Edit link at the top of the page, and then the icon on Github to suggest changes.
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