248 lines
7.7 KiB
Python
248 lines
7.7 KiB
Python
# -*- coding: utf-8 -*-
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Library General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, see <https://gnu.org/licenses/>.
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import contextlib
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import errno
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import os
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import shutil
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import kobo.log
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from kobo.shortcuts import relative_path
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from kobo.threads import WorkerThread, ThreadPool
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from pungi.util import makedirs
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class LinkerPool(ThreadPool):
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def __init__(self, link_type="hardlink-or-copy", logger=None):
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ThreadPool.__init__(self, logger)
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self.link_type = link_type
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self.linker = Linker()
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@classmethod
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def with_workers(cls, num_workers, *args, **kwargs):
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pool = cls(*args, **kwargs)
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for _ in range(num_workers):
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pool.add(LinkerThread(pool))
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return pool
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@contextlib.contextmanager
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def linker_pool(link_type="hardlink-or-copy", num_workers=10):
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"""Create a linker and make sure it is stopped no matter what."""
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linker = LinkerPool.with_workers(num_workers=num_workers, link_type=link_type)
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linker.start()
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try:
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yield linker
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finally:
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linker.stop()
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class LinkerThread(WorkerThread):
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def process(self, item, num):
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src, dst = item
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if (num % 100 == 0) or (num == self.pool.queue_total):
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self.pool.log_debug(
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"Linked %s out of %s packages" % (num, self.pool.queue_total)
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)
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directory = os.path.dirname(dst)
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makedirs(directory)
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self.pool.linker.link(src, dst, link_type=self.pool.link_type)
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class Linker(kobo.log.LoggingBase):
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def __init__(self, always_copy=None, test=False, logger=None):
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kobo.log.LoggingBase.__init__(self, logger=logger)
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self.always_copy = always_copy or []
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self.test = test
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self._inode_map = {}
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def _is_same_type(self, path1, path2):
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if not os.path.islink(path1) == os.path.islink(path2):
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return False
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if not os.path.isdir(path1) == os.path.isdir(path2):
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return False
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if not os.path.isfile(path1) == os.path.isfile(path2):
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return False
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return True
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def _is_same(self, path1, path2):
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if path1 == path2:
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return True
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if os.path.islink(path2) and not os.path.exists(path2):
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# Broken symlink
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return True
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if os.path.getsize(path1) != os.path.getsize(path2):
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return False
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if int(os.path.getmtime(path1)) != int(os.path.getmtime(path2)):
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return False
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return True
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def symlink(self, src, dst, relative=True):
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if src == dst:
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return
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# Always hardlink or copy scratch builds
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if "/work/tasks/" in src:
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self._link_file(src, dst, "hardlink-or-copy")
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old_src = src
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if relative:
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src = relative_path(src, dst)
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msg = "Symlinking %s -> %s" % (dst, src)
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if self.test:
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self.log_info("TEST: %s" % msg)
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return
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self.log_info(msg)
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try:
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os.symlink(src, dst)
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except OSError as ex:
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if ex.errno != errno.EEXIST:
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raise
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if os.path.islink(dst) and self._is_same(old_src, dst):
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if os.readlink(dst) != src:
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raise
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self.log_debug(
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"The same file already exists, skipping symlink %s -> %s"
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% (dst, src)
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)
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else:
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raise
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def hardlink(self, src, dst):
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if src == dst:
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return
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msg = "Hardlinking %s to %s" % (src, dst)
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if self.test:
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self.log_info("TEST: %s" % msg)
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return
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self.log_info(msg)
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try:
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os.link(src, dst)
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except OSError as ex:
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if ex.errno != errno.EEXIST:
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raise
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if self._is_same(src, dst):
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if not self._is_same_type(src, dst):
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self.log_error(
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"File %s already exists but has different type than %s"
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% (dst, src)
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)
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raise
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self.log_debug(
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"The same file already exists, skipping hardlink %s to %s"
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% (src, dst)
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)
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else:
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raise
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def copy(self, src, dst):
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if src == dst:
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return True
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if os.path.islink(src):
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msg = "Copying symlink %s to %s" % (src, dst)
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else:
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msg = "Copying file %s to %s" % (src, dst)
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if self.test:
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self.log_info("TEST: %s" % msg)
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return
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self.log_info(msg)
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if os.path.exists(dst):
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if self._is_same(src, dst):
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if not self._is_same_type(src, dst):
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self.log_error(
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"File %s already exists but has different type than %s"
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% (dst, src)
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)
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raise OSError(errno.EEXIST, "File exists")
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self.log_debug(
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"The same file already exists, skipping copy %s to %s" % (src, dst)
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)
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return
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else:
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raise OSError(errno.EEXIST, "File exists")
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if os.path.islink(src):
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if not os.path.islink(dst):
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os.symlink(os.readlink(src), dst)
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return
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return
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src_stat = os.stat(src)
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src_key = (src_stat.st_dev, src_stat.st_ino)
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if src_key in self._inode_map:
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# (st_dev, st_ino) found in the mapping
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self.log_debug(
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"Harlink detected, hardlinking in destination %s to %s"
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% (self._inode_map[src_key], dst)
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)
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os.link(self._inode_map[src_key], dst)
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return
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# BEWARE: shutil.copy2 automatically *rewrites* existing files
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shutil.copy2(src, dst)
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self._inode_map[src_key] = dst
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def _link_file(self, src, dst, link_type):
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if link_type == "hardlink":
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self.hardlink(src, dst)
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elif link_type == "copy":
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self.copy(src, dst)
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elif link_type in ("symlink", "abspath-symlink"):
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if os.path.islink(src):
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self.copy(src, dst)
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else:
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relative = link_type != "abspath-symlink"
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self.symlink(src, dst, relative)
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elif link_type == "hardlink-or-copy":
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try:
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self.hardlink(src, dst)
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except OSError as ex:
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if ex.errno == errno.EXDEV:
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self.copy(src, dst)
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else:
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raise
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else:
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raise ValueError("Unknown link_type: %s" % link_type)
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def link(self, src, dst, link_type="hardlink-or-copy"):
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"""Link directories recursively."""
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if os.path.isfile(src) or os.path.islink(src):
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self._link_file(src, dst, link_type)
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return
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if os.path.isfile(dst):
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raise OSError(errno.EEXIST, "File exists")
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if not self.test:
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if not os.path.exists(dst):
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makedirs(dst)
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shutil.copystat(src, dst)
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for i in os.listdir(src):
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src_path = os.path.join(src, i)
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dst_path = os.path.join(dst, i)
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self.link(src_path, dst_path, link_type)
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