Tectonic doesn't support woff2 format fonts

[sftse]

I'm using the current 0.15.0 package from the Nix store and a document fails with

error: Cannot proceed without the font: /nix/store/k090.....montserrat-9.000/share/fonts/woff2/Montserrat-LightItalic.woff2

Looking at the offending function causing the error, the checks directly prior to the abort

tectonic/crates/pdf_io/pdf_io/dpx-dvi.c

Lines 1135 to 1142 in 09b1c14

	if ((handle = dpx_open_dfont_file(filename)) != INVALID_HANDLE)
	is_dfont = 1;
	else if ((handle = dpx_open_type1_file(filename)) != INVALID_HANDLE)
	is_type1 = 1;
	else if (((handle = dpx_open_opentype_file(filename)) == INVALID_HANDLE
	&& (handle = dpx_open_truetype_file(filename)) == INVALID_HANDLE)) {
	_tt_abort("Cannot proceed without the font: %s", filename);
	}

seem to hint at this function not expecting .woff2 paths to be passed to it?

The file does exist at the location.

[sftse]

Minimal example

\documentclass{article}

\usepackage{fontspec}
\setmainfont{Montserrat}

\begin{document}
Text
\end{document}

[CraftSpider]

The version of XeTeX Tectonic uses as a backend doesn't support woff/woff2 font files. There are workarounds to make freetype not list them, so if other formats exist they will be used. If you need woff2 support specifically though, Tectonic can't do it currently.

[sftse]

Thanks, there are alternative .ttf fonts available, this fixed the problem.