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subdirdata.cpp
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subdirdata.cpp
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// Copyright (c) 2019, QuantStack and Mamba Contributors
//
// Distributed under the terms of the BSD 3-Clause License.
//
// The full license is in the file LICENSE, distributed with this software.
#include <regex>
#include <stdexcept>
#include "mamba/core/channel_context.hpp"
#include "mamba/core/output.hpp"
#include "mamba/core/package_cache.hpp"
#include "mamba/core/subdirdata.hpp"
#include "mamba/core/thread_utils.hpp"
#include "mamba/fs/filesystem.hpp"
#include "mamba/specs/channel.hpp"
#include "mamba/util/cryptography.hpp"
#include "mamba/util/json.hpp"
#include "mamba/util/string.hpp"
#include "mamba/util/url_manip.hpp"
namespace mamba
{
/*******************
* MSubdirMetadata *
*******************/
namespace
{
#ifdef _WIN32
std::chrono::system_clock::time_point filetime_to_unix(const fs::file_time_type& filetime)
{
// windows filetime is in 100ns intervals since 1601-01-01
static constexpr auto epoch_offset = std::chrono::seconds(11644473600ULL);
return std::chrono::system_clock::time_point(
std::chrono::duration_cast<std::chrono::system_clock::duration>(
filetime.time_since_epoch() - epoch_offset
)
);
}
#endif
// parse json at the beginning of the stream such as
// "_url": "https://conda.anaconda.org/conda-forge/linux-64",
// "_etag": "W/\"6092e6a2b6cec6ea5aade4e177c3edda-8\"",
// "_mod": "Sat, 04 Apr 2020 03:29:49 GMT",
// "_cache_control": "public, max-age=1200"
std::string extract_subjson(std::ifstream& s)
{
char next = {};
std::string result = {};
bool escaped = false;
int i = 0, N = 4;
std::size_t idx = 0;
std::size_t prev_keystart = 0;
bool in_key = false;
std::string key = "";
while (s.get(next))
{
idx++;
if (next == '"')
{
if (!escaped)
{
if ((i / 2) % 2 == 0)
{
in_key = !in_key;
if (in_key)
{
prev_keystart = idx + 1;
}
else
{
if (key != "_mod" && key != "_etag" && key != "_cache_control"
&& key != "_url")
{
// bail out
auto last_comma = result.find_last_of(",", prev_keystart - 2);
if (last_comma != std::string::npos && last_comma > 0)
{
result = result.substr(0, last_comma);
result.push_back('}');
return result;
}
else
{
return std::string();
}
}
key.clear();
}
}
i++;
}
// 4 keys == 4 ticks
if (i == 4 * N)
{
result += "\"}";
return result;
}
}
if (in_key && next != '"')
{
key.push_back(next);
}
escaped = (!escaped && next == '\\');
result.push_back(next);
}
return std::string();
}
}
/*******************
* MSubdirMetadata *
*******************/
void to_json(nlohmann::json& j, const SubdirMetadata::CheckedAt& ca)
{
j["value"] = ca.value;
j["last_checked"] = timestamp(ca.last_checked);
}
void from_json(const nlohmann::json& j, SubdirMetadata::CheckedAt& ca)
{
int err_code = 0;
ca.value = j["value"].get<bool>();
ca.last_checked = parse_utc_timestamp(j["last_checked"].get<std::string>(), err_code);
}
void to_json(nlohmann::json& j, const SubdirMetadata& data)
{
j["url"] = data.m_http.url;
j["etag"] = data.m_http.etag;
j["mod"] = data.m_http.last_modified;
j["cache_control"] = data.m_http.cache_control;
j["size"] = data.m_stored_file_size;
auto nsecs = std::chrono::duration_cast<std::chrono::nanoseconds>(
data.m_stored_mtime.time_since_epoch()
);
j["mtime_ns"] = nsecs.count();
j["has_zst"] = data.m_has_zst;
}
void from_json(const nlohmann::json& j, SubdirMetadata& data)
{
data.m_http.url = j["url"].get<std::string>();
data.m_http.etag = j["etag"].get<std::string>();
data.m_http.last_modified = j["mod"].get<std::string>();
data.m_http.cache_control = j["cache_control"].get<std::string>();
data.m_stored_file_size = j["size"].get<std::size_t>();
using time_type = decltype(data.m_stored_mtime);
data.m_stored_mtime = time_type(std::chrono::duration_cast<time_type::duration>(
std::chrono::nanoseconds(j["mtime_ns"].get<std::size_t>())
));
util::deserialize_maybe_missing(j, "has_zst", data.m_has_zst);
}
auto SubdirMetadata::read(const fs::u8path& file) -> expected_subdir_metadata
{
fs::u8path state_file = file;
state_file.replace_extension(".state.json");
if (fs::is_regular_file(state_file))
{
return from_state_file(state_file, file);
}
else
{
return from_repodata_file(file);
}
}
void SubdirMetadata::write(const fs::u8path& file)
{
nlohmann::json j = *this;
std::ofstream out = open_ofstream(file);
out << j.dump(4);
}
bool SubdirMetadata::check_valid_metadata(const fs::u8path& file)
{
if (const auto new_size = fs::file_size(file); new_size != m_stored_file_size)
{
LOG_INFO << "File size changed, expected " << m_stored_file_size << " but got "
<< new_size << "; invalidating metadata";
return false;
}
#ifndef _WIN32
bool last_write_time_valid = fs::last_write_time(file) == m_stored_mtime;
#else
bool last_write_time_valid = filetime_to_unix(fs::last_write_time(file)) == m_stored_mtime;
#endif
if (!last_write_time_valid)
{
LOG_INFO << "File mtime changed, invalidating metadata";
}
return last_write_time_valid;
}
const std::string& SubdirMetadata::url() const
{
return m_http.url;
}
const std::string& SubdirMetadata::etag() const
{
return m_http.etag;
}
const std::string& SubdirMetadata::last_modified() const
{
return m_http.last_modified;
}
const std::string& SubdirMetadata::cache_control() const
{
return m_http.cache_control;
}
bool SubdirMetadata::has_zst() const
{
return m_has_zst.has_value() && m_has_zst.value().value && !m_has_zst.value().has_expired();
}
void SubdirMetadata::store_http_metadata(HttpMetadata data)
{
m_http = std::move(data);
}
void SubdirMetadata::store_file_metadata(const fs::u8path& file)
{
#ifndef _WIN32
m_stored_mtime = fs::last_write_time(file);
#else
// convert windows filetime to unix timestamp
m_stored_mtime = filetime_to_unix(fs::last_write_time(file));
#endif
m_stored_file_size = fs::file_size(file);
}
void SubdirMetadata::set_zst(bool value)
{
m_has_zst = { value, std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()) };
}
auto
SubdirMetadata::from_state_file(const fs::u8path& state_file, const fs::u8path& repodata_file)
-> expected_subdir_metadata
{
std::ifstream infile = open_ifstream(state_file);
nlohmann::json j = nlohmann::json::parse(infile);
SubdirMetadata m;
try
{
m = j.get<SubdirMetadata>();
}
catch (const std::exception& e)
{
LOG_WARNING << "Could not parse state file: " << e.what();
std::error_code ec;
fs::remove(state_file, ec);
if (ec)
{
LOG_WARNING << "Could not remove state file " << state_file << ": " << ec.message();
}
return make_unexpected(
fmt::format("File: {}: Could not load cache state: {}", state_file, e.what()),
mamba_error_code::cache_not_loaded
);
}
if (!m.check_valid_metadata(repodata_file))
{
LOG_WARNING << "Cache file " << repodata_file << " was modified by another program";
return make_unexpected(
fmt::format("File: {}: Cache file mtime mismatch", state_file),
mamba_error_code::cache_not_loaded
);
}
return m;
}
auto SubdirMetadata::from_repodata_file(const fs::u8path& repodata_file) -> expected_subdir_metadata
{
const std::string json = [](const fs::u8path& file) -> std::string
{
auto lock = LockFile(file);
std::ifstream in_file = open_ifstream(file);
return extract_subjson(in_file);
}(repodata_file);
try
{
nlohmann::json result = nlohmann::json::parse(json);
SubdirMetadata m;
m.m_http.url = result.value("_url", "");
m.m_http.etag = result.value("_etag", "");
m.m_http.last_modified = result.value("_mod", "");
m.m_http.cache_control = result.value("_cache_control", "");
return m;
}
catch (std::exception& e)
{
LOG_WARNING << "Could not parse mod/etag header";
return make_unexpected(
fmt::format("File: {}: Could not parse mod/etag header ({})", repodata_file, e.what()),
mamba_error_code::cache_not_loaded
);
}
}
bool SubdirMetadata::CheckedAt::has_expired() const
{
// difference in seconds, check every 14 days
constexpr double expiration = 60 * 60 * 24 * 14;
return std::difftime(std::time(nullptr), last_checked) > expiration;
}
/***************
* MSubdirData *
***************/
namespace
{
using file_duration = fs::file_time_type::duration;
using file_time_point = fs::file_time_type::clock::time_point;
template <typename T>
std::vector<T> without_duplicates(std::vector<T>&& values)
{
const auto end_it = std::unique(values.begin(), values.end());
values.erase(end_it, values.end());
return values;
}
file_duration get_cache_age(const fs::u8path& cache_file, const file_time_point& ref)
{
try
{
fs::file_time_type last_write = fs::last_write_time(cache_file);
file_duration tdiff = ref - last_write;
return tdiff;
}
catch (std::exception&)
{
// could not open the file...
return file_duration::max();
}
}
bool is_valid(const file_duration& age)
{
return age != file_duration::max();
}
int get_max_age(const std::string& cache_control, int local_repodata_ttl)
{
int max_age = local_repodata_ttl;
if (local_repodata_ttl == 1)
{
static std::regex max_age_re("max-age=(\\d+)");
std::smatch max_age_match;
bool matches = std::regex_search(cache_control, max_age_match, max_age_re);
if (!matches)
{
max_age = 0;
}
else
{
max_age = std::stoi(max_age_match[1]);
}
}
return max_age;
}
fs::u8path get_cache_dir(const fs::u8path& cache_path)
{
return cache_path / "cache";
}
const fs::u8path& replace_file(const fs::u8path& old_file, const fs::u8path& new_file)
{
if (fs::is_regular_file(old_file))
{
fs::remove(old_file);
}
fs::copy(new_file, old_file);
return old_file;
}
}
expected_t<SubdirData> SubdirData::create(
Context& ctx,
ChannelContext& channel_context,
const specs::Channel& channel,
const std::string& platform,
MultiPackageCache& caches,
const std::string& repodata_fn
)
{
try
{
return SubdirData(ctx, channel_context, channel, platform, caches, repodata_fn);
}
catch (std::exception& e)
{
return make_unexpected(e.what(), mamba_error_code::subdirdata_not_loaded);
}
catch (...)
{
return make_unexpected(
"Unknown error when trying to load subdir data "
+ SubdirData::get_name(channel.id(), platform),
mamba_error_code::unknown
);
}
}
bool SubdirData::is_noarch() const
{
return m_is_noarch;
}
bool SubdirData::is_loaded() const
{
return m_loaded;
}
void SubdirData::clear_cache()
{
if (fs::is_regular_file(m_json_fn))
{
fs::remove(m_json_fn);
}
if (fs::is_regular_file(m_solv_fn))
{
fs::remove(m_solv_fn);
}
}
const std::string& SubdirData::name() const
{
return m_name;
}
const std::string& SubdirData::channel_id() const
{
return m_channel_id;
}
const std::string& SubdirData::platform() const
{
return m_platform;
}
const SubdirMetadata& SubdirData::metadata() const
{
return m_metadata;
}
expected_t<fs::u8path> SubdirData::valid_solv_cache() const
{
if (m_json_cache_valid && m_solv_cache_valid)
{
return (get_cache_dir(m_valid_cache_path) / m_solv_fn).string();
}
return make_unexpected("Cache not loaded", mamba_error_code::cache_not_loaded);
}
fs::u8path SubdirData::writable_solv_cache() const
{
return m_writable_pkgs_dir / "cache" / m_solv_fn;
}
expected_t<fs::u8path> SubdirData::valid_json_cache() const
{
if (m_json_cache_valid)
{
return (get_cache_dir(m_valid_cache_path) / m_json_fn).string();
}
return make_unexpected("Cache not loaded", mamba_error_code::cache_not_loaded);
}
expected_t<std::string> SubdirData::cache_path() const
{
// TODO invalidate solv cache on version updates!!
if (m_json_cache_valid && m_solv_cache_valid)
{
return (get_cache_dir(m_valid_cache_path) / m_solv_fn).string();
}
else if (m_json_cache_valid)
{
return (get_cache_dir(m_valid_cache_path) / m_json_fn).string();
}
return make_unexpected("Cache not loaded", mamba_error_code::cache_not_loaded);
}
expected_t<void> SubdirData::download_indexes(
std::vector<SubdirData>& subdirs,
const Context& context,
download::Monitor* check_monitor,
download::Monitor* download_monitor
)
{
download::MultiRequest check_requests;
for (auto& subdir : subdirs)
{
if (!subdir.is_loaded())
{
download::MultiRequest check_list = subdir.build_check_requests();
std::move(check_list.begin(), check_list.end(), std::back_inserter(check_requests));
}
}
download::download(std::move(check_requests), context.mirrors, context, {}, check_monitor);
if (is_sig_interrupted())
{
return make_unexpected("Interrupted by user", mamba_error_code::user_interrupted);
}
// TODO load local channels even when offline if (!ctx.offline)
if (!context.offline)
{
download::MultiRequest index_requests;
for (auto& subdir : subdirs)
{
if (!subdir.is_loaded())
{
index_requests.push_back(subdir.build_index_request());
}
}
try
{
download::download(
std::move(index_requests),
context.mirrors,
context,
{ /*fail_fast=*/true },
download_monitor
);
}
catch (const std::runtime_error& e)
{
return make_unexpected(e.what(), mamba_error_code::repodata_not_loaded);
}
}
return expected_t<void>();
}
std::string SubdirData::get_name(const std::string& channel_id, const std::string& platform)
{
return util::url_concat(channel_id, "/", platform);
}
SubdirData::SubdirData(
Context& ctx,
ChannelContext& channel_context,
const specs::Channel& channel,
const std::string& platform,
MultiPackageCache& caches,
const std::string& repodata_fn
)
: m_valid_cache_path("")
, m_expired_cache_path("")
, m_writable_pkgs_dir(caches.first_writable_path())
, m_channel_id(channel.id())
, m_platform(platform)
, m_name(get_name(m_channel_id, m_platform))
, m_repodata_fn(repodata_fn)
, m_json_fn(cache_fn_url(name()))
, m_solv_fn(m_json_fn.substr(0, m_json_fn.size() - 4) + "solv")
, m_is_noarch(platform == "noarch")
, p_context(&(ctx))
{
assert(!channel.is_package());
m_forbid_cache = (channel.mirror_urls().size() == 1u)
&& util::starts_with(channel.url().str(), "file://");
load(caches, channel_context, channel);
}
std::string SubdirData::repodata_url_path() const
{
return util::concat(m_platform, "/", m_repodata_fn);
}
void
SubdirData::load(MultiPackageCache& caches, ChannelContext& channel_context, const specs::Channel& channel)
{
if (!m_forbid_cache)
{
load_cache(caches);
}
if (m_loaded)
{
Console::stream() << fmt::format("{:<50} {:>20}", name(), std::string("Using cache"));
}
else
{
LOG_INFO << "No valid cache found";
if (!m_expired_cache_path.empty())
{
LOG_INFO << "Expired cache (or invalid mod/etag headers) found at '"
<< m_expired_cache_path.string() << "'";
}
update_metadata_zst(channel_context, channel);
}
}
void SubdirData::load_cache(MultiPackageCache& caches)
{
LOG_INFO << "Searching index cache file for repo '" << name() << "'";
file_time_point now = fs::file_time_type::clock::now();
const Context& context = *p_context;
const auto cache_paths = without_duplicates(caches.paths());
for (const fs::u8path& cache_path : cache_paths)
{
// TODO: rewrite this with pipe chains of ranges
fs::u8path json_file = cache_path / "cache" / m_json_fn;
if (!fs::is_regular_file(json_file))
{
continue;
}
auto lock = LockFile(cache_path / "cache");
file_duration cache_age = get_cache_age(json_file, now);
if (!is_valid(cache_age))
{
continue;
}
auto metadata_temp = SubdirMetadata::read(json_file);
if (!metadata_temp.has_value())
{
LOG_INFO << "Invalid json cache found, ignoring";
continue;
}
m_metadata = std::move(metadata_temp.value());
const int max_age = get_max_age(
m_metadata.cache_control(),
static_cast<int>(context.local_repodata_ttl)
);
const auto cache_age_seconds = std::chrono::duration_cast<std::chrono::seconds>(cache_age)
.count();
if ((max_age > cache_age_seconds || context.offline || context.use_index_cache))
{
// valid json cache found
if (!m_loaded)
{
LOG_DEBUG << "Using JSON cache";
LOG_TRACE << "Cache age: " << cache_age_seconds << "/" << max_age << "s";
m_valid_cache_path = cache_path;
m_json_cache_valid = true;
m_loaded = true;
}
// check libsolv cache
fs::u8path solv_file = cache_path / "cache" / m_solv_fn;
file_duration solv_age = get_cache_age(solv_file, now);
if (is_valid(solv_age) && solv_age <= cache_age)
{
// valid libsolv cache found
LOG_DEBUG << "Using SOLV cache";
LOG_TRACE << "Cache age: "
<< std::chrono::duration_cast<std::chrono::seconds>(solv_age).count()
<< "s";
m_solv_cache_valid = true;
m_valid_cache_path = cache_path;
// no need to search for other valid caches
break;
}
}
else
{
if (m_expired_cache_path.empty())
{
m_expired_cache_path = cache_path;
}
LOG_DEBUG << "Expired cache or invalid mod/etag headers";
}
}
}
void
SubdirData::update_metadata_zst(ChannelContext& channel_context, const specs::Channel& channel)
{
const Context& context = *p_context;
if (!context.offline || m_forbid_cache)
{
m_metadata.set_zst(m_metadata.has_zst() || channel_context.has_zst(channel));
}
}
download::MultiRequest SubdirData::build_check_requests()
{
download::MultiRequest request;
if ((!p_context->offline || m_forbid_cache) && p_context->repodata_use_zst
&& !m_metadata.has_zst())
{
request.push_back(download::Request(
name() + " (check zst)",
download::MirrorName(m_channel_id),
repodata_url_path() + ".zst",
"",
/* lhead_only = */ true,
/* lignore_failure = */ true
));
request.back().on_success = [this](const download::Success& success)
{
const std::string& effective_url = success.transfer.effective_url;
int http_status = success.transfer.http_status;
LOG_INFO << "Checked: " << effective_url << " [" << http_status << "]";
if (util::ends_with(effective_url, ".zst"))
{
m_metadata.set_zst(http_status == 200);
}
return expected_t<void>();
};
request.back().on_failure = [this](const download::Error& error)
{
if (error.transfer.has_value())
{
LOG_INFO << "Checked: " << error.transfer.value().effective_url << " ["
<< error.transfer.value().http_status << "]";
}
m_metadata.set_zst(false);
};
}
return request;
}
download::Request SubdirData::build_index_request()
{
fs::u8path writable_cache_dir = create_cache_dir(m_writable_pkgs_dir);
auto lock = LockFile(writable_cache_dir);
m_temp_file = std::make_unique<TemporaryFile>("mambaf", "", writable_cache_dir);
bool use_zst = m_metadata.has_zst();
download::Request request(
name(),
download::MirrorName(m_channel_id),
repodata_url_path() + (use_zst ? ".zst" : ""),
m_temp_file->path().string(),
/*head_only*/ false,
/*ignore_failure*/ !m_is_noarch
);
request.etag = m_metadata.etag();
request.last_modified = m_metadata.last_modified();
request.on_success = [this](const download::Success& success)
{
if (success.transfer.http_status == 304)
{
return use_existing_cache();
}
else
{
return finalize_transfer(SubdirMetadata::HttpMetadata{ success.transfer.effective_url,
success.etag,
success.last_modified,
success.cache_control });
}
};
request.on_failure = [](const download::Error& error)
{
if (error.transfer.has_value())
{
LOG_WARNING << "Unable to retrieve repodata (response: "
<< error.transfer.value().http_status << ") for '"
<< error.transfer.value().effective_url << "'";
}
else
{
LOG_WARNING << error.message;
}
if (error.retry_wait_seconds.has_value())
{
LOG_WARNING << "Retrying in " << error.retry_wait_seconds.value() << " seconds";
}
};
return request;
}
expected_t<void> SubdirData::use_existing_cache()
{
LOG_INFO << "Cache is still valid";
fs::u8path json_file = m_expired_cache_path / "cache" / m_json_fn;
fs::u8path solv_file = m_expired_cache_path / "cache" / m_solv_fn;
if (path::is_writable(json_file)
&& (!fs::is_regular_file(solv_file) || path::is_writable(solv_file)))
{
LOG_DEBUG << "Refreshing cache files ages";
m_valid_cache_path = m_expired_cache_path;
}
else
{
if (m_writable_pkgs_dir.empty())
{
LOG_ERROR << "Could not find any writable cache directory for repodata file";
return make_unexpected(
"Could not find any writable cache directory for repodata file",
mamba_error_code::subdirdata_not_loaded
);
}
LOG_DEBUG << "Copying repodata cache files from '" << m_expired_cache_path.string()
<< "' to '" << m_writable_pkgs_dir.string() << "'";
fs::u8path writable_cache_dir = get_cache_dir(m_writable_pkgs_dir);
auto lock = LockFile(writable_cache_dir);
fs::u8path copied_json_file = writable_cache_dir / m_json_fn;
json_file = replace_file(copied_json_file, json_file);
if (fs::is_regular_file(solv_file))
{
auto copied_solv_file = writable_cache_dir / m_solv_fn;
solv_file = replace_file(copied_solv_file, solv_file);
}
m_valid_cache_path = m_writable_pkgs_dir;
}
refresh_last_write_time(json_file, solv_file);
m_temp_file.reset();
m_loaded = true;
return expected_t<void>();
}
expected_t<void> SubdirData::finalize_transfer(SubdirMetadata::HttpMetadata http_data)
{
if (m_writable_pkgs_dir.empty())
{
LOG_ERROR << "Could not find any writable cache directory for repodata file";
return make_unexpected(
"Could not find any writable cache directory for repodata file",
mamba_error_code::subdirdata_not_loaded
);
}
LOG_DEBUG << "Finalized transfer of '" << http_data.url << "'";
m_metadata.store_http_metadata(std::move(http_data));
fs::u8path writable_cache_dir = get_cache_dir(m_writable_pkgs_dir);
fs::u8path json_file = writable_cache_dir / m_json_fn;
auto lock = LockFile(writable_cache_dir);
fs::u8path state_file = json_file;
state_file.replace_extension(".state.json");
std::error_code ec;
mamba_fs::rename_or_move(m_temp_file->path(), json_file, ec);
if (ec)
{
std::string error = fmt::format(
"Could not move repodata file from {} to {}: {}",
m_temp_file->path(),
json_file,
strerror(errno)
);
LOG_ERROR << error;
return make_unexpected(error, mamba_error_code::subdirdata_not_loaded);
}
m_metadata.store_file_metadata(json_file);
m_metadata.write(state_file);
m_temp_file.reset();
m_valid_cache_path = m_writable_pkgs_dir;
m_json_cache_valid = true;
m_loaded = true;
return expected_t<void>();
}
void SubdirData::refresh_last_write_time(const fs::u8path& json_file, const fs::u8path& solv_file)
{
const auto now = fs::file_time_type::clock::now();
file_duration json_age = get_cache_age(json_file, now);
file_duration solv_age = get_cache_age(solv_file, now);
{
auto lock = LockFile(json_file);
fs::last_write_time(json_file, fs::now());
m_json_cache_valid = true;
}
if (fs::is_regular_file(solv_file) && solv_age.count() <= json_age.count())
{
auto lock = LockFile(solv_file);
fs::last_write_time(solv_file, fs::now());
m_solv_cache_valid = true;
}
fs::u8path state_file = json_file;
state_file.replace_extension(".state.json");
auto lock = LockFile(state_file);
m_metadata.store_file_metadata(json_file);
m_metadata.write(state_file);
}
std::string cache_name_from_url(std::string_view url)
{
auto u = std::string(url);
if (u.empty() || (u.back() != '/' && !util::ends_with(u, ".json")))
{
u += '/';
}
// mimicking conda's behavior by special handling repodata.json
// todo support .zst
if (util::ends_with(u, "/repodata.json"))
{
u = u.substr(0, u.size() - 13);
}
return util::Md5Hasher().str_hex_str(u).substr(0, 8u);
}
std::string cache_fn_url(const std::string& url)
{
return cache_name_from_url(url) + ".json";
}
std::string create_cache_dir(const fs::u8path& cache_path)
{
const auto cache_dir = cache_path / "cache";
fs::create_directories(cache_dir);
const auto new_permissions = fs::perms::set_gid | fs::perms::owner_all | fs::perms::group_all
| fs::perms::others_read | fs::perms::others_exec;
fs::permissions(cache_dir.string().c_str(), new_permissions, fs::perm_options::replace);
return cache_dir.string();
}
} // namespace mamba