convert: add a mode where mercurial_sink skips empty revisions.
The getchanges function of some converter_source classes can return
some false positives. I.e. they sometimes claim that a file "foo"
was changed in some revision, even though its contents are still the
same.
convert_svn is particularly bad, but I think this can also happen with
convert_cvs and, at least in theory, with mercurial_source.
For regular conversions this is not really a problem - as long as
getfile returns the right contents, we'll get a converted revision
with the right contents. But when we use --filemap, this could lead
to superfluous revisions being converted.
Instead of fixing every converter_source, I decided to change
mercurial_sink to work around this problem.
When --filemap is used, we're interested only in revisions that touch
some specific files. If a revision doesn't change any of these files,
then we're not interested in it (at least for revisions with a single
parent; merges are special).
For mercurial_sink, we abuse this property and rollback a commit if
the manifest text hasn't changed. This avoids duplicating the logic
from localrepo.filecommit to detect unchanged files.
#!/usr/bin/env python
"""Test the running system for features availability. Exit with zero
if all features are there, non-zero otherwise. If a feature name is
prefixed with "no-", the absence of feature is tested.
"""
import optparse
import os
import re
import sys
import tempfile
tempprefix = 'hg-hghave-'
def matchoutput(cmd, regexp, ignorestatus=False):
"""Return True if cmd executes successfully and its output
is matched by the supplied regular expression.
"""
r = re.compile(regexp)
fh = os.popen(cmd)
s = fh.read()
ret = fh.close()
return (ignorestatus or ret is None) and r.search(s)
def has_symlink():
return hasattr(os, "symlink")
def has_fifo():
return hasattr(os, "mkfifo")
def has_cvs():
return matchoutput('cvs --version 2>&1', r'Concurrent Versions System')
def has_cvsps():
return matchoutput('cvsps -h -q 2>&1', r'cvsps version', True)
def has_executablebit():
fd, path = tempfile.mkstemp(prefix=tempprefix)
os.close(fd)
try:
s = os.lstat(path).st_mode
os.chmod(path, s | 0100)
return (os.lstat(path).st_mode & 0100 != 0)
finally:
os.remove(path)
def has_eol_in_paths():
try:
fd, path = tempfile.mkstemp(prefix=tempprefix, suffix='\n\r')
os.close(fd)
os.remove(path)
return True
except:
return False
def has_hotshot():
try:
# hotshot.stats tests hotshot and many problematic dependencies
# like profile.
import hotshot.stats
return True
except ImportError:
return False
def has_lsprof():
try:
import _lsprof
return True
except ImportError:
return False
def has_git():
return matchoutput('git --version 2>&1', r'^git version')
def has_svn():
return matchoutput('svn --version 2>&1', r'^svn, version') and \
matchoutput('svnadmin --version 2>&1', r'^svnadmin, version')
def has_svn_bindings():
try:
import svn.core
return True
except ImportError:
return False
checks = {
"cvs": (has_cvs, "cvs client"),
"cvsps": (has_cvsps, "cvsps utility"),
"eol-in-paths": (has_eol_in_paths, "end-of-lines in paths"),
"execbit": (has_executablebit, "executable bit"),
"git": (has_git, "git command line client"),
"fifo": (has_fifo, "named pipes"),
"hotshot": (has_hotshot, "python hotshot module"),
"lsprof": (has_lsprof, "python lsprof module"),
"svn": (has_svn, "subversion client and admin tools"),
"svn-bindings": (has_svn_bindings, "subversion python bindings"),
"symlink": (has_symlink, "symbolic links"),
}
def list_features():
for name, feature in checks.iteritems():
desc = feature[1]
print name + ':', desc
parser = optparse.OptionParser("%prog [options] [features]")
parser.add_option("--list-features", action="store_true",
help="list available features")
parser.add_option("-q", "--quiet", action="store_true",
help="check features silently")
if __name__ == '__main__':
options, args = parser.parse_args()
if options.list_features:
list_features()
sys.exit(0)
quiet = options.quiet
failures = 0
def error(msg):
global failures
if not quiet:
sys.stderr.write(msg + '\n')
failures += 1
for feature in args:
negate = feature.startswith('no-')
if negate:
feature = feature[3:]
if feature not in checks:
error('hghave: unknown feature: ' + feature)
continue
check, desc = checks[feature]
if not negate and not check():
error('hghave: missing feature: ' + desc)
elif negate and check():
error('hghave: system supports %s' % desc)
if failures != 0:
sys.exit(1)