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const Version = @This();
const std = @import("std");
/// The short hash (7 characters) of the latest commit.
short_hash: []const u8,
/// True if there was a diff at build time.
changes: bool,
/// The tag -- if any -- that this commit is a part of.
tag: ?[]const u8,
/// The branch that was checked out at the time of the build.
branch: []const u8,
/// Initialize the version and detect it from the Git environment. This
/// allocates using the build allocator and doesn't free.
pub fn detect(b: *std.Build) !Version {
// Execute a bunch of git commands to determine the automatic version.
var code: u8 = 0;
const branch: []const u8 = b.runAllowFail(
&[_][]const u8{ "git", "-C", b.build_root.path orelse ".", "rev-parse", "--abbrev-ref", "HEAD" },
&code,
.Ignore,
) catch |err| switch (err) {
error.FileNotFound => return error.GitNotFound,
error.ExitCodeFailure => return error.GitNotRepository,
else => return err,
};
const short_hash = short_hash: {
const output = b.runAllowFail(
&[_][]const u8{ "git", "-C", b.build_root.path orelse ".", "log", "--pretty=format:%h", "-n", "1" },
&code,
.Ignore,
) catch |err| switch (err) {
error.FileNotFound => return error.GitNotFound,
else => return err,
};
break :short_hash std.mem.trimRight(u8, output, "\r\n ");
};
const tag = b.runAllowFail(
&[_][]const u8{ "git", "-C", b.build_root.path orelse ".", "describe", "--exact-match", "--tags" },
&code,
.Ignore,
) catch |err| switch (err) {
error.FileNotFound => return error.GitNotFound,
error.ExitCodeFailure => "", // expected
else => return err,
};
_ = b.runAllowFail(&[_][]const u8{
"git",
"-C",
b.build_root.path orelse ".",
"diff",
"--quiet",
"--exit-code",
}, &code, .Ignore) catch |err| switch (err) {
error.FileNotFound => return error.GitNotFound,
error.ExitCodeFailure => {}, // expected
else => return err,
};
const changes = code != 0;
return .{
.short_hash = short_hash,
.changes = changes,
.tag = if (tag.len > 0) std.mem.trimRight(u8, tag, "\r\n ") else null,
.branch = std.mem.trimRight(u8, branch, "\r\n "),
};
}
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