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Backup config files when upgrading #1959

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merged 3 commits into from
May 9, 2019
Merged

Backup config files when upgrading #1959

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b12dce7
Backup config files if upgrading
wezrule May 6, 2019
d71e51f
Add test
wezrule May 7, 2019
43c124e
Formatting
wezrule May 7, 2019
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18 changes: 18 additions & 0 deletions nano/lib/jsonconfig.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,8 @@ class jsonconfig : public nano::error_aware<>
*error = object.deserialize_json (updated, *this);
if (!*error && updated)
{
// Before updating the config file during an upgrade make a backup first
create_backup_file (path_a);
stream.open (path_a.string (), std::ios_base::out | std::ios_base::trunc);
try
{
Expand Down Expand Up @@ -146,6 +148,22 @@ class jsonconfig : public nano::error_aware<>
stream_a.open (path_a);
}

/** Takes a filepath, appends '_backup_<timestamp>' to the end (but before any extension) and saves that file in the same directory */
void create_backup_file (boost::filesystem::path const & filepath_a)
{
auto extension = filepath_a.extension ();
auto filename_without_extension = filepath_a.filename ().replace_extension ("");
auto orig_filepath = filepath_a;
auto & backup_path = orig_filepath.remove_filename ();
auto backup_filename = filename_without_extension;
backup_filename += "_backup_";
backup_filename += std::to_string (std::chrono::system_clock::now ().time_since_epoch ().count ());
backup_filename += extension;
auto backup_filepath = backup_path / backup_filename;

boost::filesystem::copy_file (filepath_a, backup_filepath);
}

/** Returns the boost property node managed by this instance */
boost::property_tree::ptree const & get_tree ()
{
Expand Down