From 4db504b19f6dd04a44e46b43b3aff4e6cab9214d Mon Sep 17 00:00:00 2001
From: wangkerong <wangkerong@huawei.com>
Date: Wed, 13 Oct 2021 10:04:33 +0800
Subject: [PATCH] add_commom_script

---
 common.lua | 294 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 294 insertions(+)
 create mode 100644 common.lua

diff --git a/common.lua b/common.lua
new file mode 100644
index 0000000..884ee4d
--- /dev/null
+++ b/common.lua
@@ -0,0 +1,294 @@
+-- Convenience Lua functions that can be used within rpm macros
+ 
+-- Reads an rpm variable. Unlike a basic rpm.expand("{?foo}"), returns nil if
+-- the variable is unset, which is convenient in lua tests and enables
+-- differentiating unset variables from variables set to ""
+local function read(rpmvar)
+  if not rpmvar or
+    (rpm.expand("%{" .. rpmvar .. "}") == "%{" .. rpmvar .. "}") then
+    return nil
+  else
+    return rpm.expand("%{?" .. rpmvar .. "}")
+  end
+end
+ 
+-- Returns true if the macro that called this function had flag set
+--   – for example, hasflag("z") would give the following results:
+--     %foo -z bar → true
+--     %foo -z     → true
+--     %foo        → false
+local function hasflag(flag)
+  return (rpm.expand("%{-" .. flag .. "}") ~= "")
+end
+ 
+-- Returns the argument passed to flag in the macro that called this function
+--  – for example, readflag("z") would give the following results:
+--      %foo -z bar → bar
+--      %foo        → nil
+--      %foo -z ""  → empty string
+--      %foo -z ''  → empty string
+local function readflag(flag)
+  if not hasflag(flag) then
+    return nil
+  else
+    local a = rpm.expand("%{-" .. flag .. "*}")
+    -- Handle "" and '' as empty strings
+    if (a == '""') or (a == "''") then
+      a = ''
+    end
+    return a
+  end
+end
+ 
+-- Sets a spec variable; echoes the result if verbose
+local function explicitset(rpmvar, value, verbose)
+  local value = value
+  if (value == nil) or (value == "") then
+    value = "%{nil}"
+  end
+  rpm.define(rpmvar .. " " .. value)
+  if verbose then
+    rpm.expand("%{warn:Setting %%{" .. rpmvar .. "} = " .. value .. "}")
+  end
+end
+ 
+-- Unsets a spec variable if it is defined; echoes the result if verbose
+local function explicitunset(rpmvar, verbose)
+  if (rpm.expand("%{" .. rpmvar .. "}") ~= "%{" .. rpmvar .. "}") then
+    rpm.define(rpmvar .. " %{nil}")
+    if verbose then
+      rpm.expand("%{warn:Unsetting %%{" .. rpmvar .. "}}")
+    end
+  end
+end
+ 
+-- Sets a spec variable, if not already set; echoes the result if verbose
+local function safeset(rpmvar, value, verbose)
+  if (rpm.expand("%{" .. rpmvar .. "}") == "%{" .. rpmvar .. "}") then
+    explicitset(rpmvar,value,verbose)
+  end
+end
+ 
+-- Aliases a list of rpm variables to the same variables suffixed with 0 (and
+-- vice versa); echoes the result if verbose
+local function zalias(rpmvars, verbose)
+  for _, sfx in ipairs({{"","0"},{"0",""}}) do
+    for _, rpmvar in ipairs(rpmvars) do
+      local toalias = "%{?" .. rpmvar .. sfx[1] .. "}"
+      if (rpm.expand(toalias) ~= "") then
+        safeset(rpmvar .. sfx[2], toalias, verbose)
+      end
+    end
+  end
+end
+ 
+-- Takes a list of rpm variable roots and a suffix and alias current<root> to
+-- <root><suffix> if it resolves to something not empty
+local function setcurrent(rpmvars, suffix, verbose)
+  for _, rpmvar in ipairs(rpmvars) do
+    if (rpm.expand("%{?" .. rpmvar .. suffix .. "}") ~= "") then
+      explicitset(  "current" .. rpmvar, "%{" .. rpmvar .. suffix .. "}", verbose)
+    else
+      explicitunset("current" .. rpmvar,                                  verbose)
+    end
+  end
+end
+ 
+-- Echo the list of rpm variables, with suffix, if set
+local function echovars(rpmvars, suffix)
+  for _, rpmvar in ipairs(rpmvars) do
+    rpmvar = rpmvar .. suffix
+    local header = string.sub("  " .. rpmvar .. ":                                               ",1,21)
+    rpm.expand("%{?" .. rpmvar .. ":%{echo:" .. header .. "%{?" .. rpmvar .. "}}}")
+  end
+end
+ 
+-- Returns an array, indexed by suffix, containing the non-empy values of
+-- <rpmvar><suffix>, with suffix an integer string or the empty string
+local function getsuffixed(rpmvar)
+  local suffixes = {}
+  zalias({rpmvar})
+  for suffix=0,9999 do
+    local value = rpm.expand("%{?" .. rpmvar .. suffix .. "}")
+    if (value ~= "") then
+      suffixes[tostring(suffix)] = value
+    end
+  end
+  -- rpm convention is to alias no suffix to zero suffix
+  -- only add no suffix if zero suffix is different
+  local value = rpm.expand("%{?" .. rpmvar .. "}")
+  if (value ~= "") and (value ~= suffixes["0"]) then
+     suffixes[""] = value
+  end
+  return suffixes
+end
+ 
+-- Returns the list of suffixes, including the empty string, for which
+-- <rpmvar><suffix> is set to a non empty value
+local function getsuffixes(rpmvar)
+  suffixes = {}
+  for suffix in pairs(getsuffixed(rpmvar)) do
+    table.insert(suffixes,suffix)
+  end
+  table.sort(suffixes,
+             function(a,b) return (tonumber(a) or 0) < (tonumber(b) or 0) end)
+  return suffixes
+end
+ 
+-- Returns the suffix for which <rpmvar><suffix> has a non-empty value that
+-- matches best the beginning of the value string
+local function getbestsuffix(rpmvar, value)
+  local best         = nil
+  local currentmatch = ""
+  for suffix, setvalue in pairs(getsuffixed(rpmvar)) do
+  if (string.len(setvalue) > string.len(currentmatch)) and
+     (string.find(value, "^" .. setvalue)) then
+      currentmatch = setvalue
+      best         = suffix
+    end
+  end
+  return best
+end
+ 
+-- %writevars core
+local function writevars(macrofile, rpmvars)
+  for _, rpmvar in ipairs(rpmvars) do
+    print("sed -i 's\029" .. string.upper("@@" .. rpmvar .. "@@") ..
+                   "\029" .. rpm.expand(  "%{" .. rpmvar .. "}" ) ..
+                   "\029g' " .. macrofile .. "\n")
+  end
+end
+ 
+-- https://github.com/rpm-software-management/rpm/issues/566
+-- Reformat a text intended to be used used in a package description, removing
+-- rpm macro generation artefacts.
+-- – remove leading and ending empty lines
+-- – trim intermediary empty lines to a single line
+-- – fold on spaces
+-- Should really be a %%{wordwrap:…} verb
+local function wordwrap(text)
+  text = rpm.expand(text .. "\n")
+  text = string.gsub(text, "\t",              "  ")
+  text = string.gsub(text, "\r",              "\n")
+  text = string.gsub(text, " +\n",            "\n")
+  text = string.gsub(text, "\n+\n",           "\n\n")
+  text = string.gsub(text, "^\n",             "")
+  text = string.gsub(text, "\n( *)[-*—][  ]+", "\n%1– ")
+  output = ""
+  for line in string.gmatch(text, "[^\n]*\n") do
+    local pos = 0
+    local advance = ""
+    for word in string.gmatch(line, "%s*[^%s]*\n?") do
+      local wl, bad = utf8.len(word)
+      if not wl then
+        print("%{warn:Invalid UTF-8 sequence detected in:}" ..
+              "%{warn:" .. word .. "}" ..
+              "%{warn:It may produce unexpected results.}")
+        wl = bad
+      end
+      if (pos == 0) then
+        advance, n = string.gsub(word, "^(%s*– ).*", "%1")
+        if (n == 0) then
+          advance = string.gsub(word, "^(%s*).*", "%1")
+        end
+        advance = string.gsub(advance, "– ", "  ")
+        pos = pos + wl
+      elseif  (pos + wl  < 81) or
+             ((pos + wl == 81) and string.match(word, "\n$")) then
+        pos = pos + wl
+      else
+        word = advance .. string.gsub(word, "^%s*", "")
+        output = output .. "\n"
+        pos = utf8.len(word)
+      end
+      output = output .. word
+      if pos > 80 then
+        pos = 0
+        if not string.match(word, "\n$") then
+          output = output .. "\n"
+        end
+      end
+    end
+  end
+  output = string.gsub(output, "\n*$", "\n")
+  return output
+end
+ 
+-- Because rpmbuild will fail if a subpackage is declared before the source
+-- package itself, provide a source package declaration shell as fallback.
+local function srcpkg(verbose)
+  if verbose then
+    rpm.expand([[
+%{echo:Creating a header for the SRPM from %%{source_name}, %%{source_summary} and}
+%{echo:%%{source_description}. If that is not the intended result, please declare the}
+%{echo:SRPM header and set %%{source_name} in your spec file before calling a macro}
+%{echo:that creates other package headers.}
+]])
+  end
+  print(rpm.expand([[
+Name:           %{source_name}
+Summary:        %{source_summary}
+%description
+%wordwrap -v source_description
+]]))
+  explicitset("currentname", "%{source_name}", verbose)
+end
+ 
+-- %new_package core
+local function new_package(source_name, pkg_name, name_suffix, first, verbose)
+  -- Safety net when the wrapper is used in conjunction with traditional syntax
+  if (not first) and (not source_name) then
+    rpm.expand([[
+%{warn:Something already set a package name. However, %%{source_name} is not set.}
+%{warn:Please set %%{source_name} to the SRPM name to ensure reliable processing.}
+]])
+    if name_suffix then
+      print(rpm.expand("%package        " .. name_suffix))
+    else
+      print(rpm.expand("%package     -n " .. pkg_name))
+    end
+    return
+  end
+  -- New processing
+  if not (pkg_name or name_suffix or source_name) then
+    rpm.expand([[
+%{error:You need to set %%{source_name} or provide explicit package naming!}
+]])
+  end
+  if name_suffix then
+    print(rpm.expand("%package        "  .. name_suffix))
+    explicitset("currentname", "%{source_name}-" .. name_suffix, verbose)
+  else
+    if not source_name then
+      source_name = pkg_name
+    end
+    if (pkg_name == source_name) then
+      safeset("source_name", source_name, verbose)
+      print(rpm.expand("Name:           %{source_name}"))
+    else
+      if source_name and first then
+        srcpkg(verbose)
+      end
+      print(rpm.expand("%package     -n " .. pkg_name))
+    end
+    explicitset("currentname", pkg_name, verbose)
+  end
+end
+ 
+return {
+  read          = read,
+  hasflag       = hasflag,
+  readflag      = readflag,
+  explicitset   = explicitset,
+  explicitunset = explicitunset,
+  safeset       = safeset,
+  zalias        = zalias,
+  setcurrent    = setcurrent,
+  echovars      = echovars,
+  getsuffixed   = getsuffixed,
+  getsuffixes   = getsuffixes,
+  getbestsuffix = getbestsuffix,
+  writevars     = writevars,
+  wordwrap      = wordwrap,
+  new_package   = new_package,
+}
-- 
2.27.0