latexrun fails to compile pdf when pdflatex generates missing fonts

[aslushnikov]

Reproduction steps:

1. Take Linux with the following packages installed (or build docker image with this Dockerfile)

apt-get update && apt-get install -y \
    biber \
    cm-super \
    fontconfig \
    latex-xcolor \
    preview-latex-style \
    texlive-bibtex-extra \
    texlive-fonts-extra \
    texlive-generic-extra \
    texlive-lang-all \
    texlive-lang-swedish \
    texlive-latex-base \
    texlive-latex-extra \
    texlive-math-extra \
    texlive-science \
    texlive-xetex

2. Try to compile this tex file.

$ curl https://github.com/aslushnikov/latex-online/blob/master/sample/sample.tex > main.tex
$ latexrun main.tex

3. Observe latexrun error (below is truncated version, full error text is here):

failed to open file recorder output: [Errno 36] File name too long: 'larm1200.log.mktextfm: /root/.texmf-var/fonts/tfm/lh/lh-t2a/larm1200.tfm: successfully generated.)(/usr/share/texlive/texmf-dist/tex/latex/base/inputenc.sty(/usr/share/texlive/texmf-dist/tex/latex/base/

It turns out that function __parse_jobname fails to parse the
output. This happens because output contains a lot of intermediate steps of font generation.