Notes for galax - reproducible builds result

Version annotated: 1.1-12
Identified issues:
Identifier: timestamps_in_pdf_generated_by_latex
URL https://wiki.debian.org/ReproducibleBuilds/TimestampsInPDFGeneratedByLaTeX
Description PDF files generated with pdftex and pdflatex will contain CreationDate and
ModDate set to the current date and time.
Identifier: user_hostname_manually_added_requiring_further_investigation
Description Packages which intentionally capture the username or hostname into a custom format,
but aren't obviously using any tool or system which has this as a core issue.
Interesting because they could be fixed by fixing these things at build time.
Identifier: fonts_in_pdf_files
Description The internally used names/identifiers of fonts embedded into PDF files varies.
The order of embedded fonts can also be different.
.
The order is only different if the date differs (set by TZ environment
variable for example). If the date is the same, then the font name
is reproducible. Difference in hour/minute/second resolution seems
to be irrelevant.
.
The font name occurs in the /BaseFont field and in the /Fontname field.
The name is of the form XXXXXX+YYY where the XXXXXX part is the one that
varies and is called the subset_tag. It is generated in
texk/web2c/pdftexdir/utils.c function make_subset_tag() from an MD5 sum
over the font glyphs.
Comments: Capture build time in /usr/share/doc/galax/doc/manual.log.gz
Capture build time and username in
/usr/share/doc/libgalax-ocaml-dev/config/Makefile.conf.gz
 

Our notes about issues affecting packages are stored in notes.git and are targeted at packages in Debian in 'unstable/amd64' (unless they say otherwise).