python-rpm-macros/python.lua

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-- Convenience Lua functions that can be used within Python srpm/rpm macros
-- Determine alternate names provided from the given name.
-- Used in pythonname provides generator, python_provide and py_provides.
-- There are 2 rules:
-- python3-foo -> python-foo, python3X-foo
-- python3X-foo -> python-foo, python3-foo
-- There is no python-foo -> rule, python-foo packages are version agnostic.
-- Returns a table/array with strings. Empty when no rule matched.
local function python_altnames(name)
local xy = rpm.expand('%{__default_python3_pkgversion}')
local altnames = {}
local replaced
-- NB: dash needs to be escaped!
if name:match('^python3%-') then
for i, prefix in ipairs({'python-', 'python' .. xy .. '-'}) do
replaced = name:gsub('^python3%-', prefix)
table.insert(altnames, replaced)
end
elseif name:match('^python' .. xy .. '%-') then
for i, prefix in ipairs({'python-', 'python3-'}) do
replaced = name:gsub('^python' .. xy .. '%-', prefix)
table.insert(altnames, replaced)
end
end
return altnames
end
-- For any given name and epoch-version-release, return provides except self.
-- Uses python_altnames under the hood
-- Returns a table/array with strings.
local function python_altprovides(name, evr)
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-- global cache that tells what provides were already processed
if __python_altnames_provides_beenthere == nil then
__python_altnames_provides_beenthere = {}
end
__python_altnames_provides_beenthere[name .. ' ' .. evr] = true
local altprovides = {}
for i, altname in ipairs(python_altnames(name)) do
table.insert(altprovides, altname .. ' = ' .. evr)
end
return altprovides
end
-- Like python_altprovides but only return something once.
-- For each argument can only be used once, returns nil otherwise.
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-- Previous usage of python_altprovides counts as well.
local function python_altprovides_once(name, evr)
-- global cache that tells what provides were already processed
if __python_altnames_provides_beenthere == nil then
__python_altnames_provides_beenthere = {}
end
if __python_altnames_provides_beenthere[name .. ' ' .. evr] == nil then
__python_altnames_provides_beenthere[name .. ' ' .. evr] = true
return python_altprovides(name, evr)
else
return nil
end
end
return {
python_altnames = python_altnames,
python_altprovides = python_altprovides,
python_altprovides_once = python_altprovides_once,
}