upstream/mercurial-mirror Files · mercurial/node.py

sparse: reliably avoid writing to store without a lock...

sparse: reliably avoid writing to store without a lock With the code as written before this patch we can still end up writing to store in `debugsparse`. Obviously we'll write to it if by accident a store requirement is modified, but more importantly we write to it if another concurrent transaction modifies the requirements file on disk. We can't rule this out since we're not holding the store lock, so it's better to explicitly pass a permission to write instead of inferring it based on file contents.

Manuel Jacob - - Load All Authors

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      # node.py - basic nodeid manipulation for mercurial

      #

      # Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      import binascii

      # This ugly style has a noticeable effect in manifest parsing

      hex = binascii.hexlify

      bin = binascii.unhexlify

      def short(node):

          return hex(node[:6])

      nullrev = -1

      # pseudo identifier for working directory

      # (experimental, so don't add too many dependencies on it)

      wdirrev = 0x7FFFFFFF

      class sha1nodeconstants:

          nodelen = 20

          # In hex, this is '0000000000000000000000000000000000000000'

          nullid = b"\0" * nodelen

          nullhex = hex(nullid)

          # Phony node value to stand-in for new files in some uses of

          # manifests.

          # In hex, this is '2121212121212121212121212121212121212121'

          newnodeid = b'!!!!!!!!!!!!!!!!!!!!'

          # In hex, this is '3030303030303030303030303030306164646564'

          addednodeid = b'000000000000000added'

          # In hex, this is '3030303030303030303030306d6f646966696564'

          modifiednodeid = b'000000000000modified'

          wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}

          # pseudo identifier for working directory

          # (experimental, so don't add too many dependencies on it)

          # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'

          wdirid = b"\xff" * nodelen

          wdirhex = hex(wdirid)

      # legacy starting point for porting modules

      nullid = sha1nodeconstants.nullid

      nullhex = sha1nodeconstants.nullhex

      newnodeid = sha1nodeconstants.newnodeid

      addednodeid = sha1nodeconstants.addednodeid

      modifiednodeid = sha1nodeconstants.modifiednodeid

      wdirfilenodeids = sha1nodeconstants.wdirfilenodeids

      wdirid = sha1nodeconstants.wdirid

      wdirhex = sha1nodeconstants.wdirhex

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				# node.py - basic nodeid manipulation for mercurial
				#
				# Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.


				import binascii

				# This ugly style has a noticeable effect in manifest parsing
				hex = binascii.hexlify
				bin = binascii.unhexlify


				def short(node):
				return hex(node[:6])


				nullrev = -1

				# pseudo identifier for working directory
				# (experimental, so don't add too many dependencies on it)
				wdirrev = 0x7FFFFFFF


				class sha1nodeconstants:
				nodelen = 20

				# In hex, this is '0000000000000000000000000000000000000000'
				nullid = b"\0" * nodelen
				nullhex = hex(nullid)

				# Phony node value to stand-in for new files in some uses of
				# manifests.
				# In hex, this is '2121212121212121212121212121212121212121'
				newnodeid = b'!!!!!!!!!!!!!!!!!!!!'
				# In hex, this is '3030303030303030303030303030306164646564'
				addednodeid = b'000000000000000added'
				# In hex, this is '3030303030303030303030306d6f646966696564'
				modifiednodeid = b'000000000000modified'

				wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid}

				# pseudo identifier for working directory
				# (experimental, so don't add too many dependencies on it)
				# In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'
				wdirid = b"\xff" * nodelen
				wdirhex = hex(wdirid)


				# legacy starting point for porting modules
				nullid = sha1nodeconstants.nullid
				nullhex = sha1nodeconstants.nullhex
				newnodeid = sha1nodeconstants.newnodeid
				addednodeid = sha1nodeconstants.addednodeid
				modifiednodeid = sha1nodeconstants.modifiednodeid
				wdirfilenodeids = sha1nodeconstants.wdirfilenodeids
				wdirid = sha1nodeconstants.wdirid
				wdirhex = sha1nodeconstants.wdirhex