Lennart Regebro: Plone consulting

Today I got tired of going through a set of subdirectories that all are svn:externals and pasting the urls into an EXTERNALS.txt file. So I wrote a script to do it instead, using pysvn.

It preserves comments in an EXTERNAL.txt file (and the file name if it’s called something else), but stacks the comments in the beginning. It also will store the revision number you used if there has been modifications, so do an svn up first. I realize there is a better way to check that then the one I use, and I just realized it does not actually add the EXTERNALS.txt to the repository, but those improvements are left as an exercise to the reader. )

Here ya go:

import os
import tempfile
import pysvn

externals_comment = """# If you want to change externals, modify the relevant line in this
# file. Afterwards, run:
# svn propset svn:externals -F EXTERNALS.txt .

"""
client = pysvn.Client()
tempdir = tempfile.mkdtemp()
repo_revisions = {}
externals = []

filenames = os.listdir('.')
for filename in filenames:
    if os.path.isdir(filename):
        info = client.info(filename)
        if info is None:
            continue
        repo = info.repos
        if not repo in repo_revisions.keys():
            # Get the last revision for the used repository:
            repoinfo = client.info2(info.url, recurse=False)
            repo_revisions[repo] = repoinfo[0][1].rev
        if repo_revisions[repo] != info.revision:
            # Check if they differ:
            diff = client.diff(tempdir, info.url, info.revision,
                               info.url, repo_revisions[repo])
            if diff:
                use_revision = info.revision.number
            else:
                use_revision = None

            externals.append((filename, use_revision, info.url))

# OK, so lets see if there is an EXTERNALS.txt file:
externals_filename = None
for filename in ('svn:externals', 'externals.txt', 'EXTERNALS.txt'):
    if os.path.exists(filename):
        externals_filename = filename

if externals_filename is not None:
    # Suck in the comments:
    text = open(externals_filename).readlines()
    text = [x for x in text if x.strip().startswith('#') or not x.strip()]
    externals_comment = ''.join(text)
else:
    externals_filename = 'EXTERNALS.txt'

external_text = externals_comment
for dir, revision, url in externals:
    if revision is not None:
        external_text += '%s -r%s %sn' % (dir, revision, url)
    else:
        external_text += '%s %sn' % (dir, url)

open(externals_filename, 'w').write(external_text)
client.propset('svn:externals', external_text, '.')