cleanup-workdir: only deal dirs related to current arch

Some users may build for different archs under same workdir, so they
don't want to clean the dirs not related to current arch.

Run command 'bitbake -e' with selected packages to get the dirs related
to current arch then clean them.

Update the way to get the WORKDIR by parsing the IMAGE_ROOTFS by the
way.

(From OE-Core rev: a16727ebc341e0a0ce59a5200dc774cf672593ee)

Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/cleanup-workdir

@@ -47,6 +47,19 @@ def run_command(cmd):
         sys.exit(1)
     return output
 
+def get_cur_arch_dirs(workdir, arch_dirs):
+    pattern = workdir + '/(.*?)/'
+
+    # select thest 5 packages to get the dirs of current arch
+    pkgs = ['hicolor-icon-theme', 'base-files', 'acl-native', 'binutils-crosssdk', 'autoconf-nativesdk']
+
+    for pkg in pkgs:
+        cmd = "bitbake -e " + pkg + " | grep ^IMAGE_ROOTFS="
+        output = run_command(cmd)
+        output = output.split('"')[1]
+        m = re.match(pattern, output)
+        arch_dirs.append(m.group(1))
+
 def main():
     global parser
     parser = optparse.OptionParser(
@@ -87,21 +100,52 @@ This script must be ran under BUILDDIR after source file \"oe-init-build-env\"."
             version = parse_version(elems[2])
         pkg_cur_dirs.append(elems[0] + '-' + version)
 
-    cmd = "bitbake -e | grep ^TMPDIR"
+    cmd = "bitbake -e"
     output = run_command(cmd)
 
-    tmpdir = output.split('"')[1]
-    workdir = os.path.join(tmpdir, 'work')
-    if not os.path.exists(workdir):
-        print "WORKDIR %s does NOT exist. Quit." % workdir
+    tmpdir = None
+    image_rootfs = None
+    output = output.split('\n')
+    for line in output:
+        if tmpdir and image_rootfs:
+            break
+
+        if not tmpdir:
+            m = re.match('TMPDIR="(.*)"', line)
+            if m:
+                tmpdir = m.group(1)
+
+        if not image_rootfs:
+            m = re.match('IMAGE_ROOTFS="(.*)"', line)
+            if m:
+                image_rootfs = m.group(1)
+
+    # won't fail just in case
+    if not tmpdir or not image_rootfs:
+        print "Can't get TMPDIR or IMAGE_ROOTFS."
         return 1
 
+    pattern = tmpdir + '/(.*?)/(.*?)/'
+    m = re.match(pattern, image_rootfs)
+    if not m:
+        print "Can't get WORKDIR."
+        return 1
+
+    workdir = os.path.join(tmpdir, m.group(1))
+
+    # we only deal the dirs of current arch, total numbers of dirs are 6
+    cur_arch_dirs = [m.group(2)]
+    get_cur_arch_dirs(workdir, cur_arch_dirs)
+
     for workroot, dirs, files in os.walk(workdir):
         # For the files, they should NOT exist in WORKDIR. Romve them.
         for f in files:
             obsolete_dirs.append(os.path.join(workroot, f))
 
         for d in dirs:
+            if d not in cur_arch_dirs:
+                continue
+
             for pkgroot, pkgdirs, filenames in os.walk(os.path.join(workroot, d)):
                 for f in filenames:
                     obsolete_dirs.append(os.path.join(pkgroot, f))