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New helpers ynh_backup_after_failed_upgrade and ynh_backup_before_upg… (#289)

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* New helpers ynh_backup_after_failed_upgrade and ynh_backup_before_upgrade
Create a backup at the beginning of upgrade script.
Then, if the upgrade script failed, remove the app and restore it.
The backup is kept, to provide a way to restore if the upgrade is finally a bad thing.
* Implement @JimboJoe's comments
* Indentation
* --ignore-hooks -> --ignore-system
This commit is contained in:
Maniack Crudelis 2017-07-28 18:53:43 +02:00 • committed by Alexandre Aubin
parent 59c918bbfa
commit bf45cd7c4b
1 changed files with 60 additions and 0 deletions
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60
data/helpers.d/utils
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@ -25,6 +25,66 @@ ynh_get_plain_key() {
done
}
# Restore a previous backup if the upgrade process failed
#
# usage:
# ynh_backup_before_upgrade
# ynh_clean_setup () {
# ynh_backup_after_failed_upgrade
# }
# ynh_abort_if_errors
#
ynh_backup_after_failed_upgrade () {
echo "Upgrade failed." >&2
app_bck=${app//_/-} # Replace all '_' by '-'
# Check if an existing backup can be found before removing and restoring the application.
if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$backup_number
then
# Remove the application then restore it
sudo yunohost app remove $app
# Restore the backup
sudo yunohost backup restore --ignore-system $app_bck-pre-upgrade$backup_number --apps $app --force
ynh_die "The app was restored to the way it was before the failed upgrade."
fi
}
# Make a backup in case of failed upgrade
#
# usage:
# ynh_backup_before_upgrade
# ynh_clean_setup () {
# ynh_backup_after_failed_upgrade
# }
# ynh_abort_if_errors
#
ynh_backup_before_upgrade () {
backup_number=1
old_backup_number=2
app_bck=${app//_/-} # Replace all '_' by '-'
# Check if a backup already exists with the prefix 1
if sudo yunohost backup list | grep -q $app_bck-pre-upgrade1
then
# Prefix becomes 2 to preserve the previous backup
backup_number=2
old_backup_number=1
fi
# Create backup
sudo yunohost backup create --ignore-system --apps $app --name $app_bck-pre-upgrade$backup_number
if [ "$?" -eq 0 ]
then
# If the backup succeeded, remove the previous backup
if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$old_backup_number
then
# Remove the previous backup only if it exists
sudo yunohost backup delete $app_bck-pre-upgrade$old_backup_number > /dev/null
fi
else
ynh_die "Backup failed, the upgrade process was aborted."
fi
# Download, check integrity, uncompress and patch the source from app.src
#
# The file conf/app.src need to contains: