build: cope with symlinks between build components in waf dist

This will allow us to have autogen-waf.sh be a symlink to
../buildtools/scripts/autogen-waf.sh in each library.

That will prevent people from updating only the script in source4/,
and forgetting to udpate the scripts in the other libs, as happened
with commit f3f82496

1 files changed, 50 insertions, 2 deletions

diff --git a/buildtools/wafsamba/samba_dist.py b/buildtools/wafsamba/samba_dist.py
index aea45c5770..0586550814 100644
--- a/buildtools/wafsamba/samba_dist.py
+++ b/buildtools/wafsamba/samba_dist.py
@@ -6,8 +6,56 @@ from samba_utils import *
 
 dist_dirs = None
 
-def add_tarfile(tar, fname, abspath):
+def add_symlink(tar, fname, abspath, basedir):
+    '''handle symlinks to directories that may move during packaging'''
+    if not os.path.islink(abspath):
+        return False
+    tinfo = tar.gettarinfo(name=abspath, arcname=fname)
+    tgt = os.readlink(abspath)
+
+    if dist_dirs:
+        # we need to find the target relative to the main directory
+        # this is here to cope with symlinks into the buildtools
+        # directory from within the standalone libraries in Samba. For example,
+        # a symlink to ../../builtools/scripts/autogen-waf.sh needs
+        # to be rewritten as a symlink to buildtools/scripts/autogen-waf.sh
+        # when the tarball for talloc is built
+
+        # the filename without the appname-version
+        rel_fname = '/'.join(fname.split('/')[1:])
+
+        # join this with the symlink target
+        tgt_full = os.path.join(os.path.dirname(rel_fname), tgt)
+
+        # join with the base directory
+        tgt_base = os.path.normpath(os.path.join(basedir, tgt_full))
+
+        # see if this is inside one of our dist_dirs
+        for dir in dist_dirs.split():
+            if dir.find(':') != -1:
+                destdir=dir.split(':')[1]
+                dir=dir.split(':')[0]
+            else:
+                destdir = '.'
+            if dir == basedir:
+                # internal links don't get rewritten
+                continue
+            if dir == tgt_base[0:len(dir)] and tgt_base[len(dir)] == '/':
+                new_tgt = destdir + tgt_base[len(dir):]
+                tinfo.linkname = new_tgt
+                break
+
+    tinfo.uid   = 0
+    tinfo.gid   = 0
+    tinfo.uname = 'root'
+    tinfo.gname = 'root'
+    tar.addfile(tinfo)
+    return True
+
+def add_tarfile(tar, fname, abspath, basedir):
     '''add a file to the tarball'''
+    if add_symlink(tar, fname, abspath, basedir):
+        return
     try:
         tinfo = tar.gettarinfo(name=abspath, arcname=fname)
     except OSError:
@@ -61,7 +109,7 @@ def dist(appname='',version=''):
             if destdir != '.':
                 f = destdir + '/' + f
             fname = dist_base + '/' + f
-            add_tarfile(tar, fname, abspath)
+            add_tarfile(tar, fname, abspath, dir)
 
     tar.close()