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� Z d S( s8 Lockfile behaviour implemented via Unix PID files.
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d � Z RS( sA Lockfile implemented as a Unix PID file.
The lock file is a normal file named by the attribute `path`.
A lock's PID file contains a single line of text, containing
the process ID (PID) of the process that acquired the lock.
>>> lock = PIDLockFile('somefile')
>>> lock = PIDLockFile('somefile')
c C@ s& t j | | t | � | j | _ d S( N( R t __init__t Falset patht unique_name( t selfR
t threadedt timeout( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyR $ s c C@ s
t | j � S( s- Get the PID from the lock file.
( t read_pid_from_pidfileR
( R ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt read_pid* s c C@ s t j j | j � S( sv Test if the lock is currently held.
The lock is held if the PID file for this lock exists.
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t exists( R ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt is_locked/ s c C@ s" | j � o! t j � | j � k S( s� Test if the lock is held by the current process.
Returns ``True`` if the current process ID matches the
number stored in the PID file.
( R R t getpidR ( R ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt i_am_locking7 s c C@ s) | d k r | n | j } t j � } | d k rL | d k rL | | 7} n x� t r$y t | j � Wn� t k
r } | j t j k rt j � | k r� | d k r� | d k r� t d | j � � q� t
d | j � � n t j | d k r� | d p� d � q!t d | j � � qO Xd SqO Wd S( s� Acquire the lock.
Creates the PID file for this lock, or raises an error if
the lock could not be acquired.
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t OSErrort errnot EEXISTR R t sleepR ( R R t end_timet exc( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt acquire? s$
&c C@ sU | j � s" t d | j � � n | j � sD t d | j � � n t | j � d S( s� Release the lock.
Removes the PID file to release the lock, or raises an
error if the current process does not hold the lock.
s %s is not lockeds %s is locked, but not by meN( R R R
R R t remove_existing_pidfile( R ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt release_ s
c C@ s t | j � d S( s� Break an existing lock.
Removes the PID file if it already exists, otherwise does
nothing.
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break_lockl s N( t __name__t
__module__t __doc__R R R R R R R R" R# ( ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyR s
c C@ sq d } y t | d � } Wn t k
r, nA X| j � j � } y t | � } Wn t k
rb n X| j � | S( s� Read the PID recorded in the named PID file.
Read and return the numeric PID recorded as text in the named
PID file. If the PID file cannot be read, or if the content is
not a valid PID, return ``None``.
t rN( R t opent IOErrort readlinet stript intt
ValueErrort close( t pidfile_patht pidt pidfilet line( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyR v s
c C@ so t j t j Bt j B} d } t j | | | � } t j | d � } t j � } | j d | � | j � d S( s� Write the PID in the named PID file.
Get the numeric process ID (“PID”) of the current process
and write it to the named file as a line of text.
i� t ws %s
N( R t O_CREATt O_EXCLt O_WRONLYR( t fdopenR t writeR. ( R/ t
open_flagst open_modet
pidfile_fdR1 R0 ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyR � s c C@ sC y t j | � Wn+ t k
r> } | j t j k r8 q? � n Xd S( s� Remove the named PID file if it exists.
Removing a PID file that doesn't already exist puts us in the
desired state, so we ignore the condition if the file does not
exist.
N( R t removeR R t ENOENT( R/ R ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyR! � s ( R& t
__future__R R R R t R R R R R R R R R R! ( ( ( sD /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/pidlockfile.pyt <module>
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