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https://github.com/YunoHost-Apps/seafile_ynh.git
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Update experimental helper
This commit is contained in:
Josué Tille
parent
3b4dd6a7ef
commit
7d8568c2d1
1 changed files with 130 additions and 94 deletions
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#!/bin/bash
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# Add swap
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# Create a dedicated config file from a jinja template
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#
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# usage: ynh_add_swap --size=SWAP in Mb
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# | arg: -s, --size= - Amount of SWAP to add in Mb.
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ynh_add_swap () {
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# usage: ynh_add_jinja_config --template="template" --destination="destination"
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# | arg: -t, --template= - Template config file to use
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# | arg: -d, --destination= - Destination of the config file
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# | arg: -i, --ignore_vars= - List separated by space of script variables to ignore and don't pass in the jinja context.
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# | This could be useful mainly for special share which can't be retried by reference name (like the array).
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#
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# examples:
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# ynh_add_jinja_config --template="app.conf" --destination="$install_dir/app.conf"
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# ynh_add_jinja_config --template="app-env" --destination="$install_dir/app-env" --ignore_vars="complex_array yolo"
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#
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# The template can be by default the name of a file in the conf directory
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#
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# The helper will verify the checksum and backup the destination file
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# if it's different before applying the new template.
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#
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# And it will calculate and store the destination file checksum
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# into the app settings when configuration is done.
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#
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##
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## About the variables passed to the template:
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##
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#
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# All variable defined in the script are available into the template (as string) except someone described below.
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# If a variable make crash the helper for some reason (by example if the variable is of type array)
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# or you just want to don't pass a specific variable for some other reason you can add it in the '--ignore_vars=' parameter as described above.
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# Here are the list of ignored variable and so there won't never be available in the template:
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# - All system environment variable like (TERM, USER, PATH, LANG, etc).
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# If you need someone you just need to declare an other variable with the same value.
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# Note that all Yunohost variable whose name begins by 'YNH_' are available and can be used in the template.
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# - This following list:
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# legacy_args args_array template destination ignore_vars template_path python_env_var ignore_var_regex
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# progress_scale progress_string0 progress_string1 progress_string2
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# old changed binds types file_hash formats
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#
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##
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## Usage in templates:
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##
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#
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# For a full documentation of the template you can refer to: https://jinja.palletsprojects.com/en/3.1.x/templates/
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# In Yunohost context there are no really some specificity except that all variable passed are of type string.
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# So here are some example of recommended usage:
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#
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# If you need a conditional block
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#
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# {% if should_my_block_be_shown == 'true' %}
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# ...
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# {% endif %}
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#
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# or
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#
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# {% if should_my_block_be_shown == '1' %}
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# ...
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# {% endif %}
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#
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# If you need to iterate with loop:
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#
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# {% for yolo in var_with_multiline_value.splitlines() %}
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# ...
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# {% endfor %}
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#
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# or
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#
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# {% for jail in my_var_with_coma.split(',') %}
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# ...
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# {% endfor %}
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#
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ynh_add_jinja_config() {
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# Declare an array to define the options of this helper.
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declare -Ar args_array=( [s]=size= )
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local size
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local legacy_args=tdi
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local -A args_array=([t]=template= [d]=destination= [i]=ignore_vars= )
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local template
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local destination
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local ignore_vars
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# Manage arguments with getopts
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ynh_handle_getopts_args "$@"
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local template_path
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local swap_max_size=$(( $size * 1024 ))
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local free_space=$(df --output=avail / | sed 1d)
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# Because we don't want to fill the disk with a swap file, divide by 2 the available space.
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local usable_space=$(( $free_space / 2 ))
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SD_CARD_CAN_SWAP=${SD_CARD_CAN_SWAP:-0}
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# Swap on SD card only if it's is specified
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if ynh_is_main_device_a_sd_card && [ "$SD_CARD_CAN_SWAP" == "0" ]
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then
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ynh_print_warn --message="The main mountpoint of your system '/' is on an SD card, swap will not be added to prevent some damage of this one, but that can cause troubles for the app $app. If you still want activate the swap, you can relaunch the command preceded by 'SD_CARD_CAN_SWAP=1'"
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return
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fi
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# Compare the available space with the size of the swap.
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# And set a acceptable size from the request
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if [ $usable_space -ge $swap_max_size ]
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then
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local swap_size=$swap_max_size
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elif [ $usable_space -ge $(( $swap_max_size / 2 )) ]
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then
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local swap_size=$(( $swap_max_size / 2 ))
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elif [ $usable_space -ge $(( $swap_max_size / 3 )) ]
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then
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local swap_size=$(( $swap_max_size / 3 ))
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elif [ $usable_space -ge $(( $swap_max_size / 4 )) ]
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then
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local swap_size=$(( $swap_max_size / 4 ))
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else
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echo "Not enough space left for a swap file" >&2
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local swap_size=0
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fi
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# If there's enough space for a swap, and no existing swap here
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if [ $swap_size -ne 0 ] && [ ! -e /swap_$app ]
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then
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# Create file
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truncate -s 0 /swap_$app
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# set the No_COW attribute on the swapfile with chattr
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chattr +C /swap_$app || true
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# Preallocate space for the swap file, fallocate may sometime not be used, use dd instead in this case
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if ! fallocate -l ${swap_size}K /swap_$app
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then
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dd if=/dev/zero of=/swap_$app bs=1024 count=${swap_size}
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fi
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chmod 0600 /swap_$app
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# Create the swap
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mkswap /swap_$app
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# And activate it
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swapon /swap_$app || true
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# Then add an entry in fstab to load this swap at each boot.
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echo -e "/swap_$app swap swap defaults 0 0 #Swap added by $app" >> /etc/fstab
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fi
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}
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ynh_del_swap () {
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# If there a swap at this place
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if [ -e /swap_$app ]
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then
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# Clean the fstab
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sed -i "/#Swap added by $app/d" /etc/fstab
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# Desactive the swap file
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swapoff /swap_$app || true
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# And remove it
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rm /swap_$app
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fi
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}
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# Check if the device of the main mountpoint "/" is an SD card
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#
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# [internal]
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## List of all vars ignored and not passed to the template
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# WARNING Update the list on the helper documentation at the top of the helper, if you change this list
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#
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# return 0 if it's an SD card, else 1
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ynh_is_main_device_a_sd_card () {
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local main_device=$(lsblk --output PKNAME --noheadings $(findmnt / --nofsroot --uniq --output source --noheadings --first-only))
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if echo $main_device | grep --quiet "mmc" && [ $(tail -n1 /sys/block/$main_device/queue/rotational) == "0" ]
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then
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return 0
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# local vars used in the helper
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ignore_vars+=" legacy_args args_array template destination ignore_vars template_path python_env_var ignore_var_regex"
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# yunohost helpers
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ignore_vars+=" progress_scale progress_string0 progress_string1 progress_string2"
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# Arrays used in config panel
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ignore_vars+=" old changed binds types file_hash formats"
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if [ -f "$YNH_APP_BASEDIR/conf/$template" ]; then
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template_path="$YNH_APP_BASEDIR/conf/$template"
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elif [ -f "$template" ]; then
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template_path=$template
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else
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return 1
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ynh_die --message="The provided template $template doesn't exist"
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fi
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ynh_backup_if_checksum_is_different --file="$destination"
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# Make sure to set the permissions before we copy the file
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# This is to cover a case where an attacker could have
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# created a file beforehand to have control over it
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# (cp won't overwrite ownership / modes by default...)
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touch "$destination"
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chown root:root "$destination"
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chmod 640 "$destination"
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local python_env_var=''
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local ignore_var_regex
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ignore_var_regex="$(echo "$ignore_vars" | sed -E 's@^\s*(.*\w)\s*$@\1@g' | sed -E 's@(\s+)@|@g')"
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while read -r one_var; do
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# Blacklist of var to not pass to template
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if { [[ "$one_var" =~ ^[A-Z0-9_]+$ ]] && [[ "$one_var" != YNH_* ]]; } \
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|| [[ "$one_var" =~ ^($ignore_var_regex)$ ]]; then
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continue
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fi
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# Well python is very bad for the last character on raw string
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# https://stackoverflow.com/questions/647769/why-cant-pythons-raw-string-literals-end-with-a-single-backslash
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# So the solution here is to add one last char '-' so we know what it is
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# and we are sure that it not \ or ' or something else which will be problematic with python
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# And then we remove it while we are processing
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python_env_var+="$one_var=r'''${!one_var}-'''[:-1],"
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done <<< "$(compgen -v)"
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_ynh_apply_default_permissions "$destination"
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(
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python3 -c 'import os, sys, jinja2; sys.stdout.write(
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jinja2.Template(source=sys.stdin.read(),
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undefined=jinja2.StrictUndefined,
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).render('"$python_env_var"'));' <"$template_path" >"$destination"
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)
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ynh_store_file_checksum --file="$destination"
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}
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