From 360bb88ac35b5d71a4caa6dbeca2a807da6be3b7 Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Sat, 6 Jun 2020 14:58:15 +1000
Subject: [PATCH] added the pkgman package manager library

---
 lib/pkgman.lua | 152 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 lib/pkgman.lua

diff --git a/lib/pkgman.lua b/lib/pkgman.lua
new file mode 100644
index 0000000..183cf01
--- /dev/null
+++ b/lib/pkgman.lua
@@ -0,0 +1,152 @@
+local serial = require "serialization"
+local dl = require "download"
+local pkg = {}
+pkg.cfgPath = "/boot/cfg/pkg"
+pkg.sourcePath = pkg.cfgPath .. "/sources.cfg"
+pkg.installedPath = pkg.cfgPath .. "/installed.cfg"
+
+local function getSources()
+ local f = io.open(pkg.sourcePath,"rb")
+ if not f then return {} end
+ local c = f:read("*a")
+ f:close()
+ return serial.unserialize(c)
+end
+local function saveSources(t)
+ fs.makeDirectory(pkg.cfgPath)
+ local f = io.open(pkg.sourcePath,"wb")
+ f:write(serial.serialize(t))
+ f:close()
+end
+
+local function getInstalled()
+ local f = io.open(pkg.installedPath,"rb")
+ if not f then return {} end
+ local c = f:read("*a")
+ f:close()
+ return serial.unserialize(c)
+end
+local function saveInstalled(t)
+ fs.makeDirectory(pkg.cfgPath)
+ local f = io.open(pkg.installedPath,"wb")
+ if not f then return false end
+ f:write(serial.serialize(t))
+ f:close()
+end
+
+local function getRepoMeta(repo)
+ if not getSources()[repo].cache or not fs.exists("/boot/cfg/pkg/repo-"..repo..".cfg") then
+  dl(getSources()[repo].path.."/packages.cfg","/boot/cfg/pkg/repo-"..repo..".cfg")
+ end
+ local f = io.open("/boot/cfg/pkg/repo-"..repo..".cfg","rb")
+ local rt = serial.unserialize(f:read("*a"))
+ f:close()
+ if not getSources()[repo].cache then
+  fs.remove("/boot/cfg/pkg/repo-"..repo..".cfg")
+ end
+ return rt
+end
+
+local function activatePackage(path,compressed)
+ require("pkgfs").add(path,compressed)
+end
+local function deactivatePackage(path)
+ require("pkgfs").remove(path)
+end
+
+function pkg.addRepo(name,path,cache) -- string string boolean -- boolean -- Adds a repository, referred to as *name*, to the list of package sources, with the remote path *path*. If *cache* is set, keep a local copy of the repository index.
+ local sources = getSources()
+ sources[name] = {path=path,cache=cache,name=name}
+ saveSources(sources)
+end
+
+function pkg.delRepo(name) -- string -- boolean -- Removes a repository from the list of repositories.
+ local sources = getSources()
+ sources[name] = nil
+ saveSources(sources)
+end
+
+function pkg.update() -- Re-download cached repository indexes.
+ for repo,meta in pairs(getSources()) do
+  fs.remove("/boot/cfg/pkg/repo-"..repo..".cfg")
+  if meta.cache then
+   getRepoMeta(repo)
+  end
+ end
+end
+
+function pkg.list(filter) -- string -- -- Print a list of available packages matching *filter*.
+ filter = filter or ""
+ local pkglist = {}
+ for repo,_ in pairs(getSources()) do
+  for pkg,meta in pairs(getRepoMeta(repo)) do
+   if pkg:find(filter) or (pkg.meta or ""):find(filter) then
+    meta.repo = repo
+    pkglist[pkg] = meta
+   end
+  end
+ end
+ for k,v in pairs(pkglist) do
+  print(string.format("%s/%s\n %s",v.repo,k,v.description))
+ end
+end
+
+function pkg.getMeta(pkgname) -- string -- table -- Returns the metadata for a the package specified in *pkgname*.
+ print("Finding package "..pkgname)
+ for repo,info in pairs(getSources()) do
+  local pkg = getRepoMeta(repo)[pkgname]
+  if pkg then
+   print("Package "..pkgname.." located in repo "..repo.." at "..info.path)
+   pkg.repository = info
+   return pkg
+  end
+ end
+end
+
+function pkg.get(pkgname,auto) -- string boolean -- boolean -- Downloads and mounts a package, identified as *pkgname*, onto the pkgfs.
+ local pkginfo = pkg.getMeta(pkgname)
+ if not pkginfo then error("unable to locate package "..pkgname) end
+ pkginfo.manual = not auto
+ fs.makeDirectory("/boot/pkg")
+ for k,v in ipairs(pkginfo.dependencies or {}) do
+  if not getInstalled()[v] then
+   pkg.get(v)
+  end
+ end
+ dl(pkginfo.repository.path.."/"..pkginfo.filename,"/boot/pkg/"..pkginfo.filename)
+ local installed = getInstalled()
+ installed[pkgname] = pkginfo
+ saveInstalled(installed)
+ pcall(activatePackage,"/boot/pkg/"..pkginfo.filename,pkginfo.compressed)
+ return true
+end
+
+function pkg.upgrade(force) -- boolean -- boolean -- Upgrades all packages on the system to the current version stored in the relevant repository. If *force* is set, re-download all packages.
+ pkg.update()
+ fs.makeDirectory("/boot/pkg")
+ local installed = getInstalled()
+ for repo,info in pairs(getSources()) do
+  for pkgname,pkg in pairs(getRepoMeta(repo)) do
+   if pkg.version ~= installed[pkgname].version or force then
+    dl(info.path.."/"..pkg.filename,"/boot/pkg/"..pkg.filename)
+    installed[pkgname] = pkg
+    pcall(activatePackage,"/boot/pkg/"..pkg.filename,pkg.compressed)
+    return true
+   end
+  end
+ end
+ saveInstalled(installed)
+end
+
+function pkg.remove(pkgname) -- string -- boolean -- Remove the package *pkgname* from the pkgfs and package directory.
+ local installed = getInstalled()
+ local pkginfo = installed[pkgname]
+ if not pkginfo then error(pkgname .." not installed") end
+ pcall(deactivatePackage,"/boot/pkg/"..pkginfo.filename)
+ fs.remove("/boot/pkg/"..pkginfo.filename)
+ installed[pkgname] = nil
+ saveInstalled(installed)
+ return true
+end
+
+return pkg