diff options
Diffstat (limited to 'cloudinit/util.py')
| -rw-r--r-- | cloudinit/util.py | 47 |
1 files changed, 42 insertions, 5 deletions
diff --git a/cloudinit/util.py b/cloudinit/util.py index d8d735cc..e4337e3a 100644 --- a/cloudinit/util.py +++ b/cloudinit/util.py @@ -18,6 +18,7 @@ import yaml import os import os.path +import shutil import errno import subprocess from Cheetah.Template import Template @@ -94,13 +95,24 @@ def get_cfg_option_str(yobj, key, default=None): def get_cfg_option_list_or_str(yobj, key, default=None): - if key not in yobj: + """ + Gets the C{key} config option from C{yobj} as a list of strings. If the + key is present as a single string it will be returned as a list with one + string arg. + + @param yobj: The configuration object. + @param key: The configuration key to get. + @param default: The default to return if key is not found. + @return: The configuration option as a list of strings or default if key + is not found. + """ + if not key in yobj: return default if yobj[key] is None: return [] if isinstance(yobj[key], list): return yobj[key] - return([yobj[key]]) + return [yobj[key]] # get a cfg entry by its path array @@ -114,9 +126,11 @@ def get_cfg_by_path(yobj, keyp, default=None): return(cur) -# merge values from cand into source -# if src has a key, cand will not override def mergedict(src, cand): + """ + Merge values from C{cand} into C{src}. If C{src} has a key C{cand} will + not override. Nested dictionaries are merged recursively. + """ if isinstance(src, dict) and isinstance(cand, dict): for k, v in cand.iteritems(): if k not in src: @@ -126,7 +140,30 @@ def mergedict(src, cand): return src +def delete_dir_contents(dirname): + """ + Deletes all contents of a directory without deleting the directory itself. + + @param dirname: The directory whose contents should be deleted. + """ + for node in os.listdir(dirname): + node_fullpath = os.path.join(dirname, node) + if os.path.isdir(node_fullpath): + shutil.rmtree(node_fullpath) + else: + os.unlink(node_fullpath) + + def write_file(filename, content, mode=0644, omode="wb"): + """ + Writes a file with the given content and sets the file mode as specified. + Resotres the SELinux context if possible. + + @param filename: The full path of the file to write. + @param content: The content to write to the file. + @param mode: The filesystem mode to set on the file. + @param omode: The open mode used when opening the file (r, rb, a, etc.) + """ try: os.makedirs(os.path.dirname(filename)) except OSError as e: @@ -134,7 +171,7 @@ def write_file(filename, content, mode=0644, omode="wb"): raise e f = open(filename, omode) - if mode != None: + if mode is not None: os.chmod(filename, mode) f.write(content) f.close() |