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main: classify empty environment variables as unset

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This matches existing well-specified conventions for e.g. NO_COLOR.

Closes #22380.
This commit is contained in:
Carter Snook 2025-01-27 10:53:32 -06:00 committed by GitHub
parent 5647dd84c1
commit 2043e8ae05
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GPG Key ID: B5690EEEBB952194
2 changed files with 14 additions and 13 deletions
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9
lib/std/zig.zig
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@ -700,10 +700,6 @@ pub const EnvVar = enum {
XDG_CACHE_HOME,
HOME,
pub fn isSet(comptime ev: EnvVar) bool {
return std.process.hasEnvVarConstant(@tagName(ev));
}
pub fn get(ev: EnvVar, arena: std.mem.Allocator) !?[]u8 {
if (std.process.getEnvVarOwned(arena, @tagName(ev))) |value| {
return value;
@ -716,6 +712,11 @@ pub const EnvVar = enum {
pub fn getPosix(comptime ev: EnvVar) ?[:0]const u8 {
return std.posix.getenvZ(@tagName(ev));
}
pub fn isSet(ev: EnvVar, arena: std.mem.Allocator) !bool {
const value = try ev.get(arena) orelse return false;
return value.len != 0;
}
};
pub const SimpleComptimeReason = enum(u32) {

18
src/main.zig
View File

@ -826,9 +826,9 @@ fn buildOutputType(
var listen: Listen = .none;
var debug_compile_errors = false;
var verbose_link = (native_os != .wasi or builtin.link_libc) and
EnvVar.ZIG_VERBOSE_LINK.isSet();
try EnvVar.ZIG_VERBOSE_LINK.isSet(arena);
var verbose_cc = (native_os != .wasi or builtin.link_libc) and
EnvVar.ZIG_VERBOSE_CC.isSet();
try EnvVar.ZIG_VERBOSE_CC.isSet(arena);
var verbose_air = false;
var verbose_intern_pool = false;
var verbose_generic_instances = false;
@ -1006,9 +1006,9 @@ fn buildOutputType(
// if set, default the color setting to .off or .on, respectively
// explicit --color arguments will still override this setting.
// Disable color on WASI per https://github.com/WebAssembly/WASI/issues/162
var color: Color = if (native_os == .wasi or EnvVar.NO_COLOR.isSet())
var color: Color = if (native_os == .wasi or try EnvVar.NO_COLOR.isSet(arena))
.off
else if (EnvVar.CLICOLOR_FORCE.isSet())
else if (try EnvVar.CLICOLOR_FORCE.isSet(arena))
.on
else
.auto;
@ -4749,9 +4749,9 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
var reference_trace: ?u32 = null;
var debug_compile_errors = false;
var verbose_link = (native_os != .wasi or builtin.link_libc) and
EnvVar.ZIG_VERBOSE_LINK.isSet();
try EnvVar.ZIG_VERBOSE_LINK.isSet(arena);
var verbose_cc = (native_os != .wasi or builtin.link_libc) and
EnvVar.ZIG_VERBOSE_CC.isSet();
try EnvVar.ZIG_VERBOSE_CC.isSet(arena);
var verbose_air = false;
var verbose_intern_pool = false;
var verbose_generic_instances = false;
@ -4934,7 +4934,7 @@ fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
}
const work_around_btrfs_bug = native_os == .linux and
EnvVar.ZIG_BTRFS_WORKAROUND.isSet();
try EnvVar.ZIG_BTRFS_WORKAROUND.isSet(arena);
const root_prog_node = std.Progress.start(.{
.disable_printing = (color == .off),
.root_name = "Compile Build Script",
@ -5433,7 +5433,7 @@ fn jitCmd(
fatal("unable to find self exe path: {s}", .{@errorName(err)});
};
const optimize_mode: std.builtin.OptimizeMode = if (EnvVar.ZIG_DEBUG_CMD.isSet())
const optimize_mode: std.builtin.OptimizeMode = if (try EnvVar.ZIG_DEBUG_CMD.isSet(arena))
.Debug
else
.ReleaseFast;
@ -6965,7 +6965,7 @@ fn cmdFetch(
const color: Color = .auto;
const work_around_btrfs_bug = native_os == .linux and
EnvVar.ZIG_BTRFS_WORKAROUND.isSet();
try EnvVar.ZIG_BTRFS_WORKAROUND.isSet(arena);
var opt_path_or_url: ?[]const u8 = null;
var override_global_cache_dir: ?[]const u8 = try EnvVar.ZIG_GLOBAL_CACHE_DIR.get(arena);
var debug_hash: bool = false;