import os
+import shlex
+import errno
+import logging
-from wizard import shell
+import wizard
+from wizard import shell, util
-def get_sql_credentials():
+def get_sql_credentials(vars=None):
"""
Attempts to determine a user's MySQL credentials. They are
returned as a three-tuple (host, user, password).
password = os.getenv("WIZARD_MYSQL_PASSWORD")
if host is not None and user is not None and password is not None:
return (host, user, password)
+ # XXX: this is very fragile
+ elif vars and "WIZARD_DBSERVER" in vars and "WIZARD_DBUSER" in vars and "WIZARD_DBPASSWORD" in vars:
+ return (shlex.split(vars[x])[0] for x in ("WIZARD_DBSERVER", "WIZARD_DBUSER", "WIZARD_DBPASSWORD"))
try:
- return sh.eval("/mit/scripts/sql/bin/get-password").split()
- except CallError:
+ tuple = sh.eval("/mit/scripts/sql/bin/get-password").split()
+ if len(tuple) == 3:
+ return tuple
return None
+ except shell.CallError:
+ return None
+
+def get_web_host_and_path(dir=None):
+ """
+ Attempts to determine webhost and path for the current directory
+ as it would be accessible from the web. Works only for scripts
+ servers. Returns a tuple web_host, web_path, or None if it failed.
+ """
+ # XXX: THIS CODE SUCKS
+ host = os.getenv("WIZARD_WEB_HOST")
+ path = os.getenv("WIZARD_WEB_PATH")
+ if host is not None and path is not None:
+ return (host, path.rstrip('/'))
+ if not dir:
+ dir = os.getcwd()
+ # XXX: possible security risk?
+ homedir, _, web_path = dir.partition("/web_scripts")
+ if not web_path:
+ return None
+ return (util.get_dir_owner(homedir) + ".scripts.mit.edu", web_path.rstrip('/'))
+
+def get_quota_usage_and_limit(dir=None):
+ """
+ Returns a tuple (quota usage, quota limit). Works only for scripts
+ servers. Values are in KiB. Returns ``(0, None)`` if we couldn't figure it out.
+ """
+ # XXX: The correct way is to implement Python modules implementing
+ # bindings for all the appropriate interfaces
+ def parse_last_quote(ret):
+ return ret.rstrip('\'').rpartition('\'')[2]
+ if dir is None:
+ dir = os.getcwd()
+ sh = shell.Shell()
+ try:
+ cell = parse_last_quote(sh.eval("fs", "whichcell", "-path", dir))
+ except shell.CallError:
+ return (0, None)
+ except OSError as e:
+ if e.errno == errno.ENOENT:
+ return (0, None)
+ raise
+ mount = None
+ while dir:
+ try:
+ volume = parse_last_quote(sh.eval("fs", "lsmount", dir))[1:]
+ break
+ except shell.CallError:
+ dir = os.path.dirname(dir)
+ except OSError as e:
+ if e.errno == errno.ENOENT:
+ return (0, None)
+ raise
+ if not volume: return (0, None)
+ try:
+ result = sh.eval("vos", "examine", "-id", volume, "-cell", cell).splitlines()
+ except shell.CallError:
+ return (0, None)
+ try:
+ usage = int(result[0].split()[3])
+ limit = int(result[3].split()[1]) # XXX: FRAGILE
+ except ValueError:
+ raise QuotaParseError("vos examine output was:\n\n" + "\n".join(result))
+ return (usage, limit)
+
+# XXX: Possibly in the wrong module
+def get_disk_usage(dir=None, excluded_dir=".git"):
+ """
+ Recursively determines the disk usage of a directory, excluding
+ .git directories. Value is in bytes.
+ """
+ if dir is None: dir = os.getcwd()
+ sum_sizes = 0
+ for root, _, files in os.walk(dir):
+ for name in files:
+ if not os.path.join(root, name).startswith(dir + excluded_dir):
+ sum_sizes += os.path.getsize(os.path.join(root, name))
+ return sum_sizes
+class QuotaParseError(wizard.Error):
+ def __init__(self, msg):
+ self.msg = msg
+ def __str__(self):
+ return """
+ERROR: Could not parse quota. %s
+""" % self.msg