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Fix helper ynh_backup_if_checksum_is_different

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Josué Tille 2019-09-07 12:58:51 +02:00
parent 21a71f78a7
commit a975fa6c53
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1 changed files with 36 additions and 0 deletions
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36
scripts/experimental_helper.sh
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@ -393,3 +393,39 @@ ynh_handle_app_migration () {
migration_process=1
fi
}
# Verify the checksum and backup the file if it's different
# This helper is primarily meant to allow to easily backup personalised/manually
# modified config files.
#
# $app should be defined when calling this helper
#
# usage: ynh_backup_if_checksum_is_different --file=file
# | arg: -f, --file - The file on which the checksum test will be perfomed.
# | ret: the name of a backup file, or nothing
#
# Requires YunoHost version 2.6.4 or higher.
ynh_backup_if_checksum_is_different () {
# Declare an array to define the options of this helper.
local legacy_args=f
declare -Ar args_array=( [f]=file= )
local file
# Manage arguments with getopts
ynh_handle_getopts_args "$@"
local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
local checksum_value=$(ynh_app_setting_get --app=$app --key=$checksum_setting_name)
# backup_file_checksum isn't declare as local, so it can be reuse by ynh_store_file_checksum
backup_file_checksum=""
if [ -n "$checksum_value" ]
then # Proceed only if a value was stored into the app settings
if [ -e $file ] && ! echo "$checksum_value $file" | sudo md5sum -c --status
then # If the checksum is now different
backup_file_checksum="/home/yunohost.conf/backup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
sudo mkdir -p "$(dirname "$backup_file_checksum")"
sudo cp -a "$file" "$backup_file_checksum" # Backup the current file
ynh_print_warn "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file_checksum"
echo "$backup_file_checksum" # Return the name of the backup file
fi
fi
}