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build: read version from VERSION file if available

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Read the app version from a VERSION file in the build root,
trimming whitespace, and fall back to build.zig.zon if the file
is not present. This allows source tarballs to carry a VERSION
file as the source of truth for the version string.
This commit is contained in:
Mitchell Hashimoto
2026-03-28 09:21:47 -07:00
parent 8813261341
commit bcb295d9fa
1 changed files with 15 additions and 2 deletions
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17
build.zig
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@@ -3,7 +3,7 @@ const assert = std.debug.assert;
const builtin = @import("builtin");
const buildpkg = @import("src/build/main.zig");
const appVersion = @import("build.zig.zon").version;
const buildZonVersion = @import("build.zig.zon").version;
const minimumZigVersion = @import("build.zig.zon").minimum_zig_version;
comptime {
@@ -15,7 +15,20 @@ pub fn build(b: *std.Build) !void {
// want to know what options are available, you can run `--help` or
// you can read `src/build/Config.zig`.
const config = try buildpkg.Config.init(b, appVersion);
// If we have a VERSION file (present in source tarballs) then we
// use that as the version source of truth. Otherwise we fall back
// to what is in the build.zig.zon.
const app_version: []const u8 = if (b.build_root.handle.readFileAlloc(
b.allocator,
"VERSION",
128,
)) |content| std.mem.trim(
u8,
content,
&std.ascii.whitespace,
) else |_| buildZonVersion;
const config = try buildpkg.Config.init(b, app_version);
const test_filters = b.option(
[][]const u8,
"test-filter",