upgrade: speed up when we have only nodemap to downgrade
Similar to what we do on upgrade, if we have only persistent-nodemap to
downgrade we will just delete the nodemap files and update repository
requirements instead of processing all the revlogs.
After downgrade, we are left with unrequired docket and transaction files which
seems fine but can work on deleting them if someone feels we should.
Differential Revision: https://phab.mercurial-scm.org/D9992
#!/usr/bin/env python3
from __future__ import absolute_import
__doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b.
Without this svn will not detect workspace changes."""
import os
import stat
import sys
if sys.version_info[0] >= 3:
text = os.fsencode(sys.argv[1])
fname = os.fsencode(sys.argv[2])
else:
text = sys.argv[1]
fname = sys.argv[2]
f = open(fname, "ab")
try:
before = os.fstat(f.fileno())[stat.ST_MTIME]
f.write(text)
f.write(b"\n")
finally:
f.close()
inc = 1
now = os.stat(fname)[stat.ST_MTIME]
while now == before:
t = now + inc
inc += 1
os.utime(fname, (t, t))
now = os.stat(fname)[stat.ST_MTIME]