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Stop migrating legacy uvar paths

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These were changed in fish 3.0 in December 2018.

This means upgrading from fish 2.7.1 or earlier to the next fish
version will require users to set their universal variable again.
This commit is contained in:
Fabian Homborg 2022-01-07 19:39:37 +01:00
parent a7b80c9881
commit ef28931293
2 changed files with 4 additions and 123 deletions
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122
src/env_universal_common.cpp
View file

@ -92,23 +92,6 @@ constexpr const char *PATH = "--path";
/// The different types of messages found in the fishd file.
enum class uvar_message_type_t { set, set_export };
static wcstring get_machine_identifier();
/// return a list of paths where the uvars file has been historically stored.
static wcstring_list_t get_legacy_paths(const wcstring &wdir) {
wcstring_list_t result;
// A path used during fish 3.0 development.
result.push_back(wdir + L"/fish_universal_variables");
// Paths used in 2.x.
result.push_back(wdir + L"/fishd." + get_machine_identifier());
wcstring hostname_id;
if (get_hostname_identifier(hostname_id)) {
result.push_back(wdir + L'/' + hostname_id);
}
return result;
}
static maybe_t<wcstring> default_vars_path_directory() {
wcstring path;
if (!path_get_config(path)) return none();
@ -467,8 +450,7 @@ bool env_universal_t::move_new_vars_file_into_place(const wcstring &src, const w
return ret == 0;
}
void env_universal_t::initialize_at_path(callback_data_list_t &callbacks, wcstring path,
bool migrate_legacy) {
void env_universal_t::initialize_at_path(callback_data_list_t &callbacks, wcstring path) {
if (path.empty()) return;
assert(!initialized() && "Already initialized");
vars_path_ = std::move(path);
@ -478,31 +460,13 @@ void env_universal_t::initialize_at_path(callback_data_list_t &callbacks, wcstri
// Successfully loaded from our normal path.
return;
}
if (errno == ENOENT && migrate_legacy) {
// We failed to load, because the file was not found. Attempt to load from our legacy paths.
if (auto dir = default_vars_path_directory()) {
for (const wcstring &path : get_legacy_paths(*dir)) {
if (load_from_path(path, callbacks)) {
// Mark every variable as modified.
// This tells the uvars to write out the values loaded from the legacy path;
// otherwise it will conclude that the values have been deleted since they
// aren't present.
for (const auto &kv : vars) {
modified.insert(kv.first);
}
break;
}
}
}
}
}
void env_universal_t::initialize(callback_data_list_t &callbacks) {
// Set do_flock to false immediately if the default variable path is on a remote filesystem.
// See #7968.
if (path_get_config_remoteness() == dir_remoteness_t::remote) do_flock = false;
this->initialize_at_path(callbacks, default_vars_path(), true /* migrate legacy */);
this->initialize_at_path(callbacks, default_vars_path());
}
autoclose_fd_t env_universal_t::open_temporary_file(const wcstring &directory, wcstring *out_path) {
@ -913,72 +877,6 @@ void env_universal_t::parse_message_2x_internal(const wcstring &msgstr, var_tabl
/// Maximum length of hostname. Longer hostnames are truncated.
#define HOSTNAME_LEN 255
/// Length of a MAC address.
#define MAC_ADDRESS_MAX_LEN 6
// Thanks to Jan Brittenson, http://lists.apple.com/archives/xcode-users/2009/May/msg00062.html
#ifdef SIOCGIFHWADDR
// Linux
#include <net/if.h>
#include <sys/socket.h>
static bool get_mac_address(unsigned char macaddr[MAC_ADDRESS_MAX_LEN],
const char *interface = "eth0") {
bool result = false;
const int dummy = socket(AF_INET, SOCK_STREAM, 0);
if (dummy >= 0) {
struct ifreq r;
strncpy(const_cast<char *>(r.ifr_name), interface, sizeof r.ifr_name - 1);
r.ifr_name[sizeof r.ifr_name - 1] = 0;
if (ioctl(dummy, SIOCGIFHWADDR, &r) >= 0) {
std::memcpy(macaddr, r.ifr_hwaddr.sa_data, MAC_ADDRESS_MAX_LEN);
result = true;
}
close(dummy);
}
return result;
}
#elif defined(HAVE_GETIFADDRS)
// OS X and BSD
#include <ifaddrs.h>
#include <net/if_dl.h>
#include <sys/socket.h>
static bool get_mac_address(unsigned char macaddr[MAC_ADDRESS_MAX_LEN],
const char *interface = "en0") {
// BSD, Mac OS X
struct ifaddrs *ifap;
bool ok = false;
if (getifaddrs(&ifap) != 0) {
return ok;
}
for (const ifaddrs *p = ifap; p; p = p->ifa_next) {
bool is_af_link = p->ifa_addr && p->ifa_addr->sa_family == AF_LINK;
if (is_af_link && p->ifa_name && p->ifa_name[0] &&
!strcmp((const char *)p->ifa_name, interface)) {
const sockaddr_dl &sdl = *reinterpret_cast<sockaddr_dl *>(p->ifa_addr);
size_t alen = sdl.sdl_alen;
if (alen > MAC_ADDRESS_MAX_LEN) alen = MAC_ADDRESS_MAX_LEN;
std::memcpy(macaddr, sdl.sdl_data + sdl.sdl_nlen, alen);
ok = true;
break;
}
}
freeifaddrs(ifap);
return ok;
}
#else
// Unsupported
static bool get_mac_address(unsigned char macaddr[MAC_ADDRESS_MAX_LEN]) { return false; }
#endif
/// Function to get an identifier based on the hostname.
bool get_hostname_identifier(wcstring &result) {
// The behavior of gethostname if the buffer size is insufficient differs by implementation and
@ -995,22 +893,6 @@ bool get_hostname_identifier(wcstring &result) {
return success;
}
/// Get a sort of unique machine identifier. Prefer the MAC address; if that fails, fall back to the
/// hostname; if that fails, pick something.
static wcstring get_machine_identifier() {
wcstring result;
unsigned char mac_addr[MAC_ADDRESS_MAX_LEN] = {};
if (get_mac_address(mac_addr)) {
result.reserve(2 * MAC_ADDRESS_MAX_LEN);
for (auto i : mac_addr) {
append_format(result, L"%02x", i);
}
} else if (!get_hostname_identifier(result)) {
result.assign(L"nohost"); // fallback to a dummy value
}
return result;
}
namespace {
class universal_notifier_shmem_poller_t final : public universal_notifier_t {
#ifdef __CYGWIN__

5
src/env_universal_common.h
View file

@ -61,14 +61,13 @@ class env_universal_t {
/// Get a view on the universal variable table.
const var_table_t &get_table() const { return vars; }
/// Initialize this uvars for the default path, migrating legacy variables.
/// Initialize this uvars for the default path.
/// This should be called at most once on any given instance.
void initialize(callback_data_list_t &callbacks);
/// Initialize a this uvars for a given path.
/// This is exposed for testing only.
void initialize_at_path(callback_data_list_t &callbacks, wcstring path,
bool migrate_legacy = false);
void initialize_at_path(callback_data_list_t &callbacks, wcstring path);
/// Reads and writes variables at the correct path. Returns true if modified variables were
/// written.