diff hgext/remotefilelog/constants.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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/remotefilelog/constants.py	Thu Sep 27 13:03:19 2018 -0400
@@ -0,0 +1,37 @@
+from __future__ import absolute_import
+
+import struct
+
+from mercurial.i18n import _
+
+REQUIREMENT = "remotefilelog"
+
+FILENAMESTRUCT = '!H'
+FILENAMESIZE = struct.calcsize(FILENAMESTRUCT)
+
+NODESIZE = 20
+PACKREQUESTCOUNTSTRUCT = '!I'
+
+NODECOUNTSTRUCT = '!I'
+NODECOUNTSIZE = struct.calcsize(NODECOUNTSTRUCT)
+
+PATHCOUNTSTRUCT = '!I'
+PATHCOUNTSIZE = struct.calcsize(PATHCOUNTSTRUCT)
+
+FILEPACK_CATEGORY=""
+TREEPACK_CATEGORY="manifests"
+
+ALL_CATEGORIES = [FILEPACK_CATEGORY, TREEPACK_CATEGORY]
+
+# revision metadata keys. must be a single character.
+METAKEYFLAG = 'f'  # revlog flag
+METAKEYSIZE = 's'  # full rawtext size
+
+def getunits(category):
+    if category == FILEPACK_CATEGORY:
+        return _("files")
+    if category == TREEPACK_CATEGORY:
+        return _("trees")
+
+# Repack options passed to ``markledger``.
+OPTION_PACKSONLY = 'packsonly'