diff --git a/README.md b/README.md
index 1562924..15234d5 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,22 @@
 # Buildbot
 
 ## Typical autobuild.yaml format
-### Note
-Anything starting with bash will be considered as bash commands.
-`e.g. - bash ls -al`  
-All of the four blocks: updates, prebuild, build, postbuild can be ommited, and their first value will be used.
-### Example
 ```
-updates:
-    - repo (repo only, it means the package will only be built when a new commit is pushed to repo.)
-    - git <url> <remote/branch>* (* means optional)
-    - ?? (tbd)
-prebuild:
-    - standard (do nothing)
-    - ??
-build:
-    - standard (makepkg -s, note that missing aur dependencies will not be resolved.)
-    - ??
-postbuild:
-    - standard (sign and upload)
-    - do_nothing (leave it alone)
-    - ??
-```
\ No newline at end of file
+type:
+    auto (by package name)
+    git (this is a git package and will check source for updates)
+    manual (this package will only be updated when new release is pushed)
+cleanbuild:
+    true / false
+timeout:
+    30 (30 mins, int only)
+extra:
+    - update:
+        - /bin/true
+    - prebuild:
+        - echo "Hello World!"
+    - postbuild:
+        - ls > list
+    - failure:
+        - rm file
+```
diff --git a/buildbot.py b/buildbot.py
new file mode 100755
index 0000000..0760e78
--- /dev/null
+++ b/buildbot.py
@@ -0,0 +1,183 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# buildbot.py: Automatic management tool for an arch repo.
+# This file is part of Buildbot by JerryXiao
+
+import logging
+from multiprocessing.connection import Listener
+from time import time, sleep
+import os
+from pathlib import Path
+from subprocess import CalledProcessError
+
+from utils import print_exc_plus, background
+
+from config import ARCHS, BUILD_ARCHS, BUILD_ARCH_MAPPING, \
+                   MASTER_BIND_ADDRESS, MASTER_BIND_PASSWD, \
+                   PKGBUILD_DIR, MAKEPKG_PKGLIST_CMD, MAKEPKG_UPD_CMD
+from utils import bash, get_pkg_details_from_name, vercmp
+
+import json
+
+from yamlparse import load_all as load_all_yaml
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+logger = logging.getLogger(__name__)
+
+abspath=os.path.abspath(__file__)
+abspath=os.path.dirname(abspath)
+os.chdir(abspath)
+
+REPO_ROOT = Path(PKGBUILD_DIR)
+
+class Job:
+    def __init__(self, arch, pkgdir, packagelist, version):
+        buildarch = BUILD_ARCH_MAPPING.get(arch, None)
+        assert buildarch in BUILD_ARCHS
+        self.arch = arch
+        self.buildarch = buildarch
+        self.pkgdir = pkgdir
+        self.packagelist = packagelist
+        self.version = version
+        self.added = time()
+        self.claimed = 0
+
+class jobsManager:
+    def __init__(self):
+        self.__buildjobs = dict()
+        for arch in BUILD_ARCHS:
+            self.__buildjobs.setdefault(arch, list())
+        self.__uploadjobs = list()
+        self.__curr_job = None
+        self.pkgconfigs = load_all_yaml()
+    def _new_buildjob(self, job, buildarch):
+        assert type(job) is Job
+        self.__buildjobs.get(buildarch).append(job)
+    def claim_job(self, buildarch):
+        assert buildarch in BUILD_ARCHS
+        if self.__curr_job:
+            return None
+        jobs = self.__buildjobs.get(buildarch, list())
+        if jobs:
+            self.__curr_job = jobs.pop(0)
+            return self.__curr_job
+    def __finish_job(self, pkgdir):
+        assert pkgdir == self.__curr_job.pkgdir
+        # do upload
+        self.__curr_job = None
+        return True
+    def tick(self):
+        '''
+            check for updates,
+            create new jobs
+            and run them
+        '''
+        if self.__curr_job is None:
+            updates = updmgr.check_update()
+            for update in updates:
+                (pkg, packagelist, ver) = update
+
+
+jobsmgr = jobsManager()
+
+class updateManager:
+    def __init__(self, filename='pkgver.json'):
+        self.__filename = filename
+        self.__pkgvers = dict()
+        self.__load()
+    def __load(self):
+        if Path(self.__filename).exists():
+            with open(self.__filename,"r") as f:
+                try:
+                    pkgvers = json.loads(f.read())
+                except json.JSONDecodeError:
+                    logger.error('pkgver.json - Bad json')
+                    print_exc_plus
+                    exit(1)
+        else:
+            logger.warning(f'No {self.__filename} found')
+            pkgvers = dict()
+        assert type(pkgvers) is dict
+        for pkgname in pkgvers:
+            assert type(pkgname) is str
+        self.__pkgvers = pkgvers
+    def _save(self):
+        pkgvers = json.dumps(self.__pkgvers, indent=4)
+        pkgvers += '\n'
+        with open(self.__filename,"w") as f:
+            if f.writable:
+                f.write(pkgvers)
+            else:
+                logger.error('pkgver.json - Not writable')
+    def __get_package_list(self, dirname):
+        pkgdir = REPO_ROOT / dirname
+        assert pkgdir.exists()
+        pkglist = bash(MAKEPKG_PKGLIST_CMD, cwd=pkgdir)
+        pkglist = pkglist.split('\n')
+        return pkglist
+    def __get_new_ver(self, dirname):
+        pkgfiles = self.__get_package_list(dirname)
+        ver = get_pkg_details_from_name(pkgfiles[0])
+        return (ver, pkgfiles)
+    def check_update(self):
+        updates = list()
+        for pkg in jobsmgr.pkgconfigs:
+            pkgdir = REPO_ROOT / pkg.dirname
+            logger.info(f'checking update: {pkg.dirname}')
+            bash(MAKEPKG_UPD_CMD, cwd=pkgdir, RUN_CMD_TIMEOUT=60*60)
+            if pkg.type in ('git', 'manual'):
+                (ver, pkgfiles) = self.__get_new_ver(pkg.dirname)
+                oldver = self.__pkgvers.get(pkg.dirname, None)
+                if oldver is None or vercmp(ver, oldver) == 1:
+                    self.__pkgvers[pkg.dirname] = ver
+                    updates.append((pkg, pkgfiles, ver))
+                else:
+                    logger.warning(f'package: {pkg.dirname} downgrade attempted')
+            else:
+                logger.warning(f'unknown package type: {pkg.type}')
+        self._save()
+        return updates
+
+updmgr = updateManager()
+
+
+@background
+def __main():
+    pass
+
+
+
+
+
+
+
+def run(funcname, args=list(), kwargs=dict()):
+    if funcname in ('clean', 'regenerate', 'remove',
+                    'update', 'push_files', 'add_files'):
+        logger.info('running: %s %s %s',funcname, args, kwargs)
+        ret = eval(funcname)(*args, **kwargs)
+        logger.info('done: %s %s',funcname, ret)
+        return ret
+    else:
+        logger.error('unexpected: %s %s %s',funcname, args, kwargs)
+        return False
+
+
+if __name__ == '__main__':
+    __main() # start the main worker thread
+    while True:
+        try:
+            with Listener(MASTER_BIND_ADDRESS, authkey=MASTER_BIND_PASSWD) as listener:
+                with listener.accept() as conn:
+                    logger.info('connection accepted from %s', listener.last_accepted)
+                    myrecv = conn.recv()
+                    if type(myrecv) is list and len(myrecv) == 3:
+                        (funcname, args, kwargs) = myrecv
+                        funcname = str(funcname)
+                        conn.send(run(funcname, args=args, kwargs=kwargs))
+        except Exception:
+            print_exc_plus()
+        except KeyboardInterrupt:
+            logger.info('KeyboardInterrupt')
+            print_exc_plus()
+            break
diff --git a/config.py b/config.py
index 644f59f..52d0c38 100644
--- a/config.py
+++ b/config.py
@@ -6,7 +6,10 @@
 ARCHS = ['aarch64', 'any', 'armv7h', 'x86_64']
 REPO_NAME='jerryxiao'
 PKG_COMPRESSION='xz'
-BUILD_ARCHS = ['aarch64', 'any', 'x86_64']
+BUILD_ARCHS = ['aarch64', 'x86_64']
+BUILD_ARCH_MAPPING = {'aarch64': 'aarch64', 'x86_64': 'x86_64', 'any': 'x86_64', 'armv7h': None}
+
+AUTOBUILD_FNAME = 'autobuild.yaml'
 
 
 #### config for repo.py
@@ -38,3 +41,11 @@ GPG_SIGN_CMD = (f'gpg --default-key {GPG_KEY} --no-armor'
 
 MASTER_BIND_ADDRESS = ('localhost', 7011)
 MASTER_BIND_PASSWD = b'mypassword'
+PKGBUILD_DIR = 'pkgbuilds'
+MAKEPKG = 'makepkg --nosign --needed --noconfirm --noprogressbar --nocolor'
+
+MAKEPKG_UPD_CMD = 'makepkg --syncdeps --nobuild'
+MAKEPKG_MAKE_CMD = 'makepkg --syncdeps --noextract'
+MAKEPKG_MAKE_CMD_CLEAN = 'makepkg --syncdeps --noextract --clean --cleanbuild'
+
+MAKEPKG_PKGLIST_CMD = f'{MAKEPKG} --packagelist'
diff --git a/master.py b/master.py
deleted file mode 100755
index 56fafa5..0000000
--- a/master.py
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
diff --git a/package.py b/package.py
deleted file mode 100644
index f6ed4d4..0000000
--- a/package.py
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-import logging
-from utils import bash
-
-logger = logging.getLogger(name='package')
-
-
-# makepkg -o
-# makepkg -e
-# makepkg --nosign
-# makepkg --packagelist
-# gpg --default-key {GPG_KEY} --no-armor --pinentry-mode loopback --passphrase '' --detach-sign --yes -- aaa
diff --git a/repod.py b/repod.py
index 979f79b..7c775f0 100644
--- a/repod.py
+++ b/repod.py
@@ -4,7 +4,6 @@
 # This file is part of Buildbot by JerryXiao
 
 import logging
-from threading import Thread
 from multiprocessing.connection import Listener
 from time import time, sleep
 from pathlib import Path
@@ -106,6 +105,17 @@ class pushFm:
 
 pfm = pushFm()
 
+def push_files(filename, size):
+    pfm.tick()
+    return pfm.start(filename, size)
+
+def add_files(filename, overwrite=False):
+    return pfm.done(filename, overwrite=overwrite)
+
+
+
+# server part
+
 def run(funcname, args=list(), kwargs=dict()):
     if funcname in ('clean', 'regenerate', 'remove',
                     'update', 'push_files', 'add_files'):
@@ -117,13 +127,6 @@ def run(funcname, args=list(), kwargs=dict()):
         logger.error('unexpected: %s %s %s',funcname, args, kwargs)
         return False
 
-def push_files(filename, size):
-    pfm.tick()
-    return pfm.start(filename, size)
-
-def add_files(filename, overwrite=False):
-    return pfm.done(filename, overwrite=overwrite)
-
 if __name__ == '__main__':
     while True:
         try:
diff --git a/utils.py b/utils.py
index 6b1d0eb..4f0e58b 100644
--- a/utils.py
+++ b/utils.py
@@ -25,12 +25,12 @@ def bash(cmdline, **kwargs):
     logger.info(f'bash: {cmdline}')
     return(run_cmd(['/bin/bash', '-x', '-e', '-c', cmdline], **kwargs))
 
-def long_bash(cmdline, hours=2):
+def long_bash(cmdline, cwd=None, hours=2):
     assert type(hours) is int and hours >= 1
     logger.info(f'longbash{hours}: {cmdline}')
-    return bash(cmdline, keepalive=True, KEEPALIVE_TIMEOUT=60, RUN_CMD_TIMEOUT=hours*60*60)
+    return bash(cmdline, cwd=cwd, keepalive=True, KEEPALIVE_TIMEOUT=60, RUN_CMD_TIMEOUT=hours*60*60)
 
-def run_cmd(cmd, keepalive=False, KEEPALIVE_TIMEOUT=30, RUN_CMD_TIMEOUT=60):
+def run_cmd(cmd, cwd=None, keepalive=False, KEEPALIVE_TIMEOUT=30, RUN_CMD_TIMEOUT=60):
     logger.debug('run_cmd: %s', cmd)
     RUN_CMD_LOOP_TIME = KEEPALIVE_TIMEOUT - 1 if KEEPALIVE_TIMEOUT >= 10 else 5
     stopped = False
@@ -50,7 +50,7 @@ def run_cmd(cmd, keepalive=False, KEEPALIVE_TIMEOUT=30, RUN_CMD_TIMEOUT=60):
             last_read[0] = last_read_time
             last_read[1] = line
         stdout_lock.release()
-    p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+    p = subprocess.Popen(cmd, cwd=cwd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                          stderr=subprocess.STDOUT, encoding='utf-8')
     check_stdout(p.stdout)
     process_start = int(time())
@@ -182,4 +182,3 @@ def print_exc_plus():
                 print(value)
             except:
                 print("<ERROR WHILE PRINTING VALUE>")
-
diff --git a/worker.py b/worker.py
deleted file mode 100755
index a919215..0000000
--- a/worker.py
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-import os
-import sys
-import logging
-from utils import bash
-from yaml import load, dump
-from pathlib import Path
-
-logger = logging.getLogger(__name__)
-
-abspath=os.path.abspath(__file__)
-abspath=os.path.dirname(abspath)
-os.chdir(abspath)
-
-# include all autobuild.yaml files
-
-REPO_NAME = Path('repo')
-BUTOBUILD_FNAME = 'autobuild.yaml'
-for mydir in REPO_NAME.iterdir():
-    if mydir.is_dir() and (mydir / BUTOBUILD_FNAME).exists():
-        # parsing yaml
-        logger.info('Bulidbot: found %s in %s', BUTOBUILD_FNAME, mydir / BUTOBUILD_FNAME)
-
diff --git a/yamlparse.py b/yamlparse.py
new file mode 100644
index 0000000..c91af65
--- /dev/null
+++ b/yamlparse.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import os
+import logging
+from yaml import load, Loader
+from pathlib import Path
+
+from utils import print_exc_plus
+
+from config import PKGBUILD_DIR, AUTOBUILD_FNAME
+
+logger = logging.getLogger(__name__)
+
+abspath=os.path.abspath(__file__)
+abspath=os.path.dirname(abspath)
+os.chdir(abspath)
+
+# parse all autobuild.yaml files
+
+REPO_ROOT = Path(PKGBUILD_DIR)
+
+class pkgConfig:
+    def __init__(self, dirname, pkgtype, cleanbuild, timeout, extra):
+        self.dirname = dirname
+
+        self.type = pkgtype
+        self.__determine_type()
+
+        if cleanbuild is None:
+            cleanbuild = True
+        assert type(cleanbuild) is bool
+        self.cleanbuild = cleanbuild
+
+        self.timeout = 30 if timeout is None else int(timeout)
+        # timeout in minutes
+
+        self.__extra = extra
+        self.__process_extra()
+
+    def __determine_type(self):
+        if self.type in (None, 'auto'):
+            if self.dirname.endswith('-git'):
+                self.type = 'git'
+                return
+        self.type = 'manual'
+
+    def __process_extra(self):
+        stages = ('prebuild', 'postbuild', 'update', 'failure')
+        for stage in stages:
+            setattr(self, stage, list())
+        for entry in self.__extra:
+            assert type(entry) is dict and len(entry) == 1
+            for k in entry:
+                if k in stages:
+                    cmd = entry.get(k, list())
+                    assert type(cmd) is list
+                    setattr(self, k, cmd)
+
+    def __repr__(self):
+        ret = "pkgConfig("
+        for myproperty in \
+            (
+                'dirname', 'type', 'cleanbuild', 'timeout'
+                'prebuild', 'postbuild', 'update', 'failure'
+            ):
+            ret += f'{myproperty}={getattr(self, myproperty)},'
+        ret += ')'
+        return ret
+
+def load_all():
+    pkgconfigs = list()
+    for mydir in REPO_ROOT.iterdir():
+        try:
+            if mydir.is_dir() and (mydir / AUTOBUILD_FNAME).exists():
+                # parsing yaml
+                logger.info('Bulidbot: found %s in %s', AUTOBUILD_FNAME,
+                                                        mydir / AUTOBUILD_FNAME)
+                with open(mydir / AUTOBUILD_FNAME, 'r') as f:
+                    content = f.read()
+                    content = load(content, Loader=Loader)
+                    assert type(content) is dict
+                    args = [content.get(part, None) for part in \
+                            ('type', 'cleanbuild', 'timeout', 'extra')]
+                    args = [mydir.name] + args
+                    pkgconfigs.append(pkgConfig(*args))
+        except Exception:
+            logger.error(f'Error while parsing {AUTOBUILD_FNAME} for {mydir.name}')
+            print_exc_plus()
+    return pkgconfigs
+
+if __name__ == '__main__':
+    print(load_all())