# vtk-abi-compat -- vtk(abi) and %%vtk_abi for chroots that use FEDORA's vtk.
#
# Our consumers (opencv-viz, mitk, ctk-vtk, InsightToolkit-vtk, ...) carry
#   Requires: vtk(abi) = %%{vtk_abi}
# because VTK's sonames are libvtk*.so.1 across all of 9.x, so rpm cannot tell
# 9.6 from 9.7 and a Fedora f3d built on 9.6 died loading our 9.7 (2026-10-26,
# docs: memory vtk-soname-hides-abi-break). Our vtk.spec Provides vtk(abi) and
# ships macros.vtk; Fedora's vtk ships neither (checked: vtk 9.6.2-13.fc45 and
# 9.7.0-2.fc46 have no macros file and no vtk(abi) Provides). Morgan decided
# 2026-10-27 to rebase onto Fedora's vtk (rawhide first, f45 after GA); this
# package supplies both pieces there, so the consumers build and pin unchanged.
#
# The series is read from the vtk-devel in the buildroot, so one spec serves
# every chroot. It is evaluated at parse time; when the SRPM is made without
# vtk-devel installed it is the placeholder 0.0, and %%build refuses that, so
# no binary ever carries it.
#
# Do NOT put this in a chroot that uses OUR vtk: that vtk already provides both,
# and %%build refuses a buildroot where %%vtk_abi is already defined.
#
# File name: macros.vtk-abi, not macros.vtk, so it can never collide with our
# vtk-devel's file. No Fedora package ships either name or provides vtk(abi)
# or rpm_macro(vtk_abi) (repoquery of f45 and rawhide, 2026-10-27, with
# macros.python3 as the positive control).

%global vtk_series %(rpm -q --qf '%%{version}\\n' vtk-devel 2>/dev/null | grep -E '^[0-9]+\\.[0-9]+' | head -1 | cut -d. -f1,2)
%if "%{vtk_series}" == ""
%global vtk_series 0.0
%endif
# The first version of the NEXT minor series, for the upper bound.
%global vtk_next %{lua:
local M, m = string.match(rpm.expand("%{vtk_series}"), "^(%d+)%.(%d+)$")
if M then print(M .. "." .. (tonumber(m) + 1)) else print("0.1") end
}

# Arch-specific for %%{?_isa}, but nothing is compiled.
%global debug_package %{nil}

Name:           vtk-abi-compat
Version:        1.0
Release:        1%{?dist}
Summary:        VTK ABI series marker (vtk(abi) and %%vtk_abi) for Fedora's vtk

License:        MIT
URL:            https://gitlab.com/morgan.hough/neurofedora

BuildRequires:  vtk-devel

Provides:       vtk(abi) = %{vtk_series}
Requires:       (vtk%{?_isa} >= %{vtk_series} with vtk%{?_isa} < %{vtk_next})

%description
Fedora's vtk package keeps the soname libvtk*.so.1 across every 9.x release,
although VTK breaks ABI between minor releases, so rpm cannot keep a program
built against one VTK series from loading another. This package states which
series is installed: it Provides vtk(abi) = %{vtk_series}, requires a vtk of
exactly that series, and defines the rpm macro %%vtk_abi for packages that pin
"Requires: vtk(abi) = %%{vtk_abi}" at build time.

%prep
# Nothing to unpack.

%build
# Refuse the SRPM placeholder: a binary must name a real series.
case "%{vtk_series}" in
    0.0|'') echo "ERROR: vtk_series is '%{vtk_series}'; vtk-devel is not installed in the buildroot" >&2; exit 1 ;;
esac
# Refuse a buildroot whose vtk already defines it (our COPR vtk): this package
# would only duplicate it there.
%if 0%{?vtk_abi:1}
echo "ERROR: %%vtk_abi is already defined (%{vtk_abi}); this vtk does not need vtk-abi-compat" >&2
exit 1
%endif

%install
install -d %{buildroot}%{_rpmmacrodir}
cat > %{buildroot}%{_rpmmacrodir}/macros.vtk-abi <<'EOF'
# The VTK major.minor series this system's vtk provides (vtk-abi-compat).
# Consumers: Requires: vtk(abi) = %%{vtk_abi}
EOF
echo '%%vtk_abi %{vtk_series}' >> %{buildroot}%{_rpmmacrodir}/macros.vtk-abi

%check
# The macro must expand, from the shipped file, to the series vtk-devel reports.
got=$(rpm --load %{buildroot}%{_rpmmacrodir}/macros.vtk-abi --eval '%%vtk_abi')
want=$(rpm -q --qf '%%{version}\n' vtk-devel | head -1 | cut -d. -f1,2)
echo "vtk_abi from the shipped file: '$got'; vtk-devel series: '$want'; upper bound: %{vtk_next}"
test -n "$want" && test "$got" = "$want"
# Negative control on the comparison: a different series must not match.
test "$got" != "0.0"

%files
%{_rpmmacrodir}/macros.vtk-abi

%changelog
* Tue Oct 27 2026 Morgan Hough <morgan.hough@gmail.com> - 1.0-1
- New package for the rebase onto Fedora's vtk (rawhide first, f45 after GA):
  Provides vtk(abi) = the buildroot vtk's major.minor, requires that series,
  and ships macros.vtk-abi defining %%vtk_abi.