Mercurial > hg
annotate hgext/remotefilelog/extutil.py @ 40495:3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
This is remotefilelog as of my recent patches for compatibility with
current tip of hg, minus support for old versions of Mercurial and
some FB-specific features like their treemanifest extension and
fetching linkrev data from a patched phabricator. The file extutil.py
moved from hgext3rd to remotefilelog.
This is not yet ready to be landed, consider it a preview for
now. Planned changes include:
* replace lz4 with zstd
* rename some capabilities, requirements and wireproto commands to mark
them as experimental
* consolidate bits of shallowutil with related functions (eg readfile)
I'm certainly open to other (small) changes, but my rough mission is
to land this largely as-is so we can use it as a model of the
functionality we need going forward for lazy-fetching of file contents
from a server.
# no-check-commit because of a few foo_bar functions
Differential Revision: https://phab.mercurial-scm.org/D4782
author | Augie Fackler <augie@google.com> |
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date | Thu, 27 Sep 2018 13:03:19 -0400 |
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children | 60eb35b0c11c |
rev | line source |
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40495
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1 # extutil.py - useful utility methods for extensions |
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2 # |
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3 # Copyright 2016 Facebook |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import contextlib |
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11 import errno |
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12 import os |
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13 import subprocess |
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14 import time |
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15 |
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16 from mercurial import ( |
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17 error, |
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18 lock as lockmod, |
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19 pycompat, |
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20 util, |
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21 vfs as vfsmod, |
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22 ) |
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23 |
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24 if pycompat.iswindows: |
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25 # no fork on Windows, but we can create a detached process |
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26 # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx |
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27 # No stdlib constant exists for this value |
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28 DETACHED_PROCESS = 0x00000008 |
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29 _creationflags = DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP |
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30 |
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31 def runbgcommand(script, env, shell=False, stdout=None, stderr=None): |
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32 '''Spawn a command without waiting for it to finish.''' |
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33 # we can't use close_fds *and* redirect stdin. I'm not sure that we |
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34 # need to because the detached process has no console connection. |
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35 subprocess.Popen( |
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36 script, shell=shell, env=env, close_fds=True, |
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37 creationflags=_creationflags, stdout=stdout, stderr=stderr) |
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38 else: |
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39 def runbgcommand(cmd, env, shell=False, stdout=None, stderr=None): |
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40 '''Spawn a command without waiting for it to finish.''' |
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41 # double-fork to completely detach from the parent process |
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42 # based on http://code.activestate.com/recipes/278731 |
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43 pid = os.fork() |
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44 if pid: |
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45 # Parent process |
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46 (_pid, status) = os.waitpid(pid, 0) |
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47 if os.WIFEXITED(status): |
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48 returncode = os.WEXITSTATUS(status) |
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49 else: |
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50 returncode = -os.WTERMSIG(status) |
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51 if returncode != 0: |
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52 # The child process's return code is 0 on success, an errno |
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53 # value on failure, or 255 if we don't have a valid errno |
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54 # value. |
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55 # |
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56 # (It would be slightly nicer to return the full exception info |
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57 # over a pipe as the subprocess module does. For now it |
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58 # doesn't seem worth adding that complexity here, though.) |
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59 if returncode == 255: |
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60 returncode = errno.EINVAL |
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61 raise OSError(returncode, 'error running %r: %s' % |
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62 (cmd, os.strerror(returncode))) |
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63 return |
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64 |
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65 returncode = 255 |
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66 try: |
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67 # Start a new session |
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68 os.setsid() |
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69 |
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70 stdin = open(os.devnull, 'r') |
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71 if stdout is None: |
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72 stdout = open(os.devnull, 'w') |
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73 if stderr is None: |
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74 stderr = open(os.devnull, 'w') |
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75 |
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76 # connect stdin to devnull to make sure the subprocess can't |
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77 # muck up that stream for mercurial. |
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78 subprocess.Popen( |
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79 cmd, shell=shell, env=env, close_fds=True, |
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80 stdin=stdin, stdout=stdout, stderr=stderr) |
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81 returncode = 0 |
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82 except EnvironmentError as ex: |
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83 returncode = (ex.errno & 0xff) |
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84 if returncode == 0: |
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85 # This shouldn't happen, but just in case make sure the |
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86 # return code is never 0 here. |
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87 returncode = 255 |
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88 except Exception: |
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89 returncode = 255 |
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90 finally: |
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91 # mission accomplished, this child needs to exit and not |
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92 # continue the hg process here. |
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93 os._exit(returncode) |
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94 |
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95 def runshellcommand(script, env): |
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96 ''' |
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97 Run a shell command in the background. |
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98 This spawns the command and returns before it completes. |
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99 |
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100 Prefer using runbgcommand() instead of this function. This function should |
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101 be discouraged in new code. Running commands through a subshell requires |
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102 you to be very careful about correctly escaping arguments, and you need to |
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103 make sure your command works with both Windows and Unix shells. |
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104 ''' |
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105 runbgcommand(script, env=env, shell=True) |
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106 |
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107 @contextlib.contextmanager |
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108 def flock(lockpath, description, timeout=-1): |
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109 """A flock based lock object. Currently it is always non-blocking. |
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110 |
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111 Note that since it is flock based, you can accidentally take it multiple |
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112 times within one process and the first one to be released will release all |
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113 of them. So the caller needs to be careful to not create more than one |
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114 instance per lock. |
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115 """ |
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116 |
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117 # best effort lightweight lock |
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118 try: |
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119 import fcntl |
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120 fcntl.flock |
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121 except ImportError: |
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122 # fallback to Mercurial lock |
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123 vfs = vfsmod.vfs(os.path.dirname(lockpath)) |
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124 with lockmod.lock(vfs, os.path.basename(lockpath), timeout=timeout): |
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125 yield |
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126 return |
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127 # make sure lock file exists |
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128 util.makedirs(os.path.dirname(lockpath)) |
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129 with open(lockpath, 'a'): |
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130 pass |
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131 lockfd = os.open(lockpath, os.O_RDONLY, 0o664) |
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132 start = time.time() |
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133 while True: |
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134 try: |
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135 fcntl.flock(lockfd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
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136 break |
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137 except IOError as ex: |
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138 if ex.errno == errno.EAGAIN: |
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139 if timeout != -1 and time.time() - start > timeout: |
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140 raise error.LockHeld(errno.EAGAIN, lockpath, description, |
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141 '') |
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142 else: |
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143 time.sleep(0.05) |
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144 continue |
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145 raise |
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146 |
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147 try: |
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148 yield |
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149 finally: |
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150 fcntl.flock(lockfd, fcntl.LOCK_UN) |
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151 os.close(lockfd) |