git-p4: stream from perforce to speed up clones

Change commit() to stream data from Perforce and into fast-import
rather than reading into memory first, and then writing out. This
hugely reduces the memory requirements when cloning non-incrementally.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Luke Diamand 2009-07-30 00:13:46 +01:00 committed by Junio C Hamano
parent c14417c4f5
commit b932705b45

View File

@ -201,7 +201,7 @@ def isModeExec(mode):
def isModeExecChanged(src_mode, dst_mode):
return isModeExec(src_mode) != isModeExec(dst_mode)
def p4CmdList(cmd, stdin=None, stdin_mode='w+b'):
def p4CmdList(cmd, stdin=None, stdin_mode='w+b', cb=None):
cmd = p4_build_cmd("-G %s" % (cmd))
if verbose:
sys.stderr.write("Opening pipe: %s\n" % cmd)
@ -224,6 +224,9 @@ def p4CmdList(cmd, stdin=None, stdin_mode='w+b'):
try:
while True:
entry = marshal.load(p4.stdout)
if cb is not None:
cb(entry)
else:
result.append(entry)
except EOFError:
pass
@ -950,10 +953,84 @@ class P4Sync(Command):
return branches
## Should move this out, doesn't use SELF.
def readP4Files(self, files):
# output one file from the P4 stream
# - helper for streamP4Files
def streamOneP4File(self, file, contents):
if file["type"] == "apple":
print "\nfile %s is a strange apple file that forks. Ignoring" % \
file['depotFile']
return
relPath = self.stripRepoPath(file['depotFile'], self.branchPrefixes)
if verbose:
sys.stderr.write("%s\n" % relPath)
mode = "644"
if isP4Exec(file["type"]):
mode = "755"
elif file["type"] == "symlink":
mode = "120000"
# p4 print on a symlink contains "target\n", so strip it off
last = contents.pop()
last = last[:-1]
contents.append(last)
if self.isWindows and file["type"].endswith("text"):
mangled = []
for data in contents:
data = data.replace("\r\n", "\n")
mangled.append(data)
contents = mangled
if file['type'] in ('text+ko', 'unicode+ko', 'binary+ko'):
contents = map(lambda text: re.sub(r'(?i)\$(Id|Header):[^$]*\$',r'$\1$', text), contents)
elif file['type'] in ('text+k', 'ktext', 'kxtext', 'unicode+k', 'binary+k'):
contents = map(lambda text: re.sub(r'\$(Id|Header|Author|Date|DateTime|Change|File|Revision):[^$\n]*\$',r'$\1$', text), contents)
self.gitStream.write("M %s inline %s\n" % (mode, relPath))
# total length...
length = 0
for d in contents:
length = length + len(d)
self.gitStream.write("data %d\n" % length)
for d in contents:
self.gitStream.write(d)
self.gitStream.write("\n")
def streamOneP4Deletion(self, file):
relPath = self.stripRepoPath(file['path'], self.branchPrefixes)
if verbose:
sys.stderr.write("delete %s\n" % relPath)
self.gitStream.write("D %s\n" % relPath)
# handle another chunk of streaming data
def streamP4FilesCb(self, marshalled):
if marshalled.has_key('depotFile') and self.stream_have_file_info:
# start of a new file - output the old one first
self.streamOneP4File(self.stream_file, self.stream_contents)
self.stream_file = {}
self.stream_contents = []
self.stream_have_file_info = False
# pick up the new file information... for the
# 'data' field we need to append to our array
for k in marshalled.keys():
if k == 'data':
self.stream_contents.append(marshalled['data'])
else:
self.stream_file[k] = marshalled[k]
self.stream_have_file_info = True
# Stream directly from "p4 files" into "git fast-import"
def streamP4Files(self, files):
filesForCommit = []
filesToRead = []
filesToDelete = []
for f in files:
includeFile = True
@ -967,50 +1044,35 @@ class P4Sync(Command):
filesForCommit.append(f)
if f['action'] not in ('delete', 'purge'):
filesToRead.append(f)
else:
filesToDelete.append(f)
# deleted files...
for f in filesToDelete:
self.streamOneP4Deletion(f)
filedata = []
if len(filesToRead) > 0:
filedata = p4CmdList('-x - print',
stdin='\n'.join(['%s#%s' % (f['path'], f['rev'])
self.stream_file = {}
self.stream_contents = []
self.stream_have_file_info = False
# curry self argument
def streamP4FilesCbSelf(entry):
self.streamP4FilesCb(entry)
p4CmdList("-x - print",
'\n'.join(['%s#%s' % (f['path'], f['rev'])
for f in filesToRead]),
stdin_mode='w+')
cb=streamP4FilesCbSelf)
if "p4ExitCode" in filedata[0]:
die("Problems executing p4. Error: [%d]."
% (filedata[0]['p4ExitCode']));
j = 0;
contents = {}
while j < len(filedata):
stat = filedata[j]
j += 1
text = ''
while j < len(filedata) and filedata[j]['code'] in ('text', 'unicode', 'binary'):
text += filedata[j]['data']
del filedata[j]['data']
j += 1
if not stat.has_key('depotFile'):
sys.stderr.write("p4 print fails with: %s\n" % repr(stat))
continue
if stat['type'] in ('text+ko', 'unicode+ko', 'binary+ko'):
text = re.sub(r'(?i)\$(Id|Header):[^$]*\$',r'$\1$', text)
elif stat['type'] in ('text+k', 'ktext', 'kxtext', 'unicode+k', 'binary+k'):
text = re.sub(r'\$(Id|Header|Author|Date|DateTime|Change|File|Revision):[^$\n]*\$',r'$\1$', text)
contents[stat['depotFile']] = text
for f in filesForCommit:
path = f['path']
if contents.has_key(path):
f['data'] = contents[path]
return filesForCommit
# do the last chunk
if self.stream_file.has_key('depotFile'):
self.streamOneP4File(self.stream_file, self.stream_contents)
def commit(self, details, files, branch, branchPrefixes, parent = ""):
epoch = details["time"]
author = details["user"]
self.branchPrefixes = branchPrefixes
if self.verbose:
print "commit into %s" % branch
@ -1023,7 +1085,6 @@ class P4Sync(Command):
new_files.append (f)
else:
sys.stderr.write("Ignoring file outside of prefix: %s\n" % path)
files = self.readP4Files(new_files)
self.gitStream.write("commit %s\n" % branch)
# gitStream.write("mark :%s\n" % details["change"])
@ -1051,33 +1112,7 @@ class P4Sync(Command):
print "parent %s" % parent
self.gitStream.write("from %s\n" % parent)
for file in files:
if file["type"] == "apple":
print "\nfile %s is a strange apple file that forks. Ignoring!" % file['path']
continue
relPath = self.stripRepoPath(file['path'], branchPrefixes)
if file["action"] in ("delete", "purge"):
self.gitStream.write("D %s\n" % relPath)
else:
data = file['data']
mode = "644"
if isP4Exec(file["type"]):
mode = "755"
elif file["type"] == "symlink":
mode = "120000"
# p4 print on a symlink contains "target\n", so strip it off
data = data[:-1]
if self.isWindows and file["type"].endswith("text"):
data = data.replace("\r\n", "\n")
self.gitStream.write("M %s inline %s\n" % (mode, relPath))
self.gitStream.write("data %s\n" % len(data))
self.gitStream.write(data)
self.gitStream.write("\n")
self.streamP4Files(new_files)
self.gitStream.write("\n")
change = int(details["change"])