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git p4: implement view spec wildcards with "p4 where"
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"git p4" does not support many of the view wildcards, such as * and
%%n.  It only knows the common ... mapping, and exclusions.

Redo the entire wildcard code around the idea of directly querying
the p4 server for the mapping.  For each commit, invoke "p4 where"
with committed file paths as args and use the client mapping to
decide where the file goes in git.

This simplifies a lot of code, and adds support for all wildcards
supported by p4.  Downside is that there is probably a 20%-ish
slowdown with this approach.

[pw: redo code and tests]

Signed-off-by: Kazuki Saitoh <ksaitoh560@gmail.com>
Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Kazuki Saitoh authored and Junio C Hamano committed Sep 3, 2013
1 parent 7994603 commit 9d57c4a
Showing 1 changed file with 59 additions and 164 deletions.
223 changes: 59 additions & 164 deletions git-p4.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -780,11 +780,14 @@ def getClientSpec():
# dictionary of all client parameters
entry = specList[0]

# the //client/ name
client_name = entry["Client"]

# just the keys that start with "View"
view_keys = [ k for k in entry.keys() if k.startswith("View") ]

# hold this new View
view = View()
view = View(client_name)

# append the lines, in order, to the view
for view_num in range(len(view_keys)):
Expand Down Expand Up @@ -1555,8 +1558,8 @@ def exportGitTags(self, gitTags):
for b in body:
labelTemplate += "\t" + b + "\n"
labelTemplate += "View:\n"
for mapping in clientSpec.mappings:
labelTemplate += "\t%s\n" % mapping.depot_side.path
for depot_side in clientSpec.mappings:
labelTemplate += "\t%s\n" % depot_side

if self.dry_run:
print "Would create p4 label %s for tag" % name
Expand All @@ -1568,7 +1571,7 @@ def exportGitTags(self, gitTags):

# Use the label
p4_system(["tag", "-l", name] +
["%s@%s" % (mapping.depot_side.path, changelist) for mapping in clientSpec.mappings])
["%s@%s" % (depot_side, changelist) for depot_side in clientSpec.mappings])

if verbose:
print "created p4 label for tag %s" % name
Expand Down Expand Up @@ -1796,117 +1799,16 @@ class View(object):
"""Represent a p4 view ("p4 help views"), and map files in a
repo according to the view."""

class Path(object):
"""A depot or client path, possibly containing wildcards.
The only one supported is ... at the end, currently.
Initialize with the full path, with //depot or //client."""

def __init__(self, path, is_depot):
self.path = path
self.is_depot = is_depot
self.find_wildcards()
# remember the prefix bit, useful for relative mappings
m = re.match("(//[^/]+/)", self.path)
if not m:
die("Path %s does not start with //prefix/" % self.path)
prefix = m.group(1)
if not self.is_depot:
# strip //client/ on client paths
self.path = self.path[len(prefix):]

def find_wildcards(self):
"""Make sure wildcards are valid, and set up internal
variables."""

self.ends_triple_dot = False
# There are three wildcards allowed in p4 views
# (see "p4 help views"). This code knows how to
# handle "..." (only at the end), but cannot deal with
# "%%n" or "*". Only check the depot_side, as p4 should
# validate that the client_side matches too.
if re.search(r'%%[1-9]', self.path):
die("Can't handle %%n wildcards in view: %s" % self.path)
if self.path.find("*") >= 0:
die("Can't handle * wildcards in view: %s" % self.path)
triple_dot_index = self.path.find("...")
if triple_dot_index >= 0:
if triple_dot_index != len(self.path) - 3:
die("Can handle only single ... wildcard, at end: %s" %
self.path)
self.ends_triple_dot = True

def ensure_compatible(self, other_path):
"""Make sure the wildcards agree."""
if self.ends_triple_dot != other_path.ends_triple_dot:
die("Both paths must end with ... if either does;\n" +
"paths: %s %s" % (self.path, other_path.path))

def match_wildcards(self, test_path):
"""See if this test_path matches us, and fill in the value
of the wildcards if so. Returns a tuple of
(True|False, wildcards[]). For now, only the ... at end
is supported, so at most one wildcard."""
if self.ends_triple_dot:
dotless = self.path[:-3]
if test_path.startswith(dotless):
wildcard = test_path[len(dotless):]
return (True, [ wildcard ])
else:
if test_path == self.path:
return (True, [])
return (False, [])

def match(self, test_path):
"""Just return if it matches; don't bother with the wildcards."""
b, _ = self.match_wildcards(test_path)
return b

def fill_in_wildcards(self, wildcards):
"""Return the relative path, with the wildcards filled in
if there are any."""
if self.ends_triple_dot:
return self.path[:-3] + wildcards[0]
else:
return self.path

class Mapping(object):
def __init__(self, depot_side, client_side, overlay, exclude):
# depot_side is without the trailing /... if it had one
self.depot_side = View.Path(depot_side, is_depot=True)
self.client_side = View.Path(client_side, is_depot=False)
self.overlay = overlay # started with "+"
self.exclude = exclude # started with "-"
assert not (self.overlay and self.exclude)
self.depot_side.ensure_compatible(self.client_side)

def __str__(self):
c = " "
if self.overlay:
c = "+"
if self.exclude:
c = "-"
return "View.Mapping: %s%s -> %s" % \
(c, self.depot_side.path, self.client_side.path)

def map_depot_to_client(self, depot_path):
"""Calculate the client path if using this mapping on the
given depot path; does not consider the effect of other
mappings in a view. Even excluded mappings are returned."""
matches, wildcards = self.depot_side.match_wildcards(depot_path)
if not matches:
return ""
client_path = self.client_side.fill_in_wildcards(wildcards)
return client_path

#
# View methods
#
def __init__(self):
def __init__(self, client_name):
self.mappings = []
self.client_prefix = "//%s/" % client_name
# cache results of "p4 where" to lookup client file locations
self.client_spec_path_cache = {}

def append(self, view_line):
"""Parse a view line, splitting it into depot and client
sides. Append to self.mappings, preserving order."""
sides. Append to self.mappings, preserving order. This
is only needed for tag creation."""

# Split the view line into exactly two words. P4 enforces
# structure on these lines that simplifies this quite a bit.
Expand Down Expand Up @@ -1934,76 +1836,62 @@ def append(self, view_line):
depot_side = view_line[0:space_index]
rhs_index = space_index + 1

if view_line[rhs_index] == '"':
# Second word is double quoted. Make sure there is a
# double quote at the end too.
if not view_line.endswith('"'):
die("View line with rhs quote should end with one: %s" %
view_line)
# skip the quotes
client_side = view_line[rhs_index+1:-1]
else:
client_side = view_line[rhs_index:]

# prefix + means overlay on previous mapping
overlay = False
if depot_side.startswith("+"):
overlay = True
depot_side = depot_side[1:]

# prefix - means exclude this path
# prefix - means exclude this path, leave out of mappings
exclude = False
if depot_side.startswith("-"):
exclude = True
depot_side = depot_side[1:]

m = View.Mapping(depot_side, client_side, overlay, exclude)
self.mappings.append(m)
if not exclude:
self.mappings.append(depot_side)

def map_in_client(self, depot_path):
"""Return the relative location in the client where this
depot file should live. Returns "" if the file should
not be mapped in the client."""
def convert_client_path(self, clientFile):
# chop off //client/ part to make it relative
if not clientFile.startswith(self.client_prefix):
die("No prefix '%s' on clientFile '%s'" %
(self.client_prefix, clientFile))
return clientFile[len(self.client_prefix):]

paths_filled = []
client_path = ""
def update_client_spec_path_cache(self, files):
""" Caching file paths by "p4 where" batch query """

# look at later entries first
for m in self.mappings[::-1]:
# List depot file paths exclude that already cached
fileArgs = [f['path'] for f in files if f['path'] not in self.client_spec_path_cache]

# see where will this path end up in the client
p = m.map_depot_to_client(depot_path)
if len(fileArgs) == 0:
return # All files in cache

if p == "":
# Depot path does not belong in client. Must remember
# this, as previous items should not cause files to
# exist in this path either. Remember that the list is
# being walked from the end, which has higher precedence.
# Overlap mappings do not exclude previous mappings.
if not m.overlay:
paths_filled.append(m.client_side)
where_result = p4CmdList(["-x", "-", "where"], stdin=fileArgs)
for res in where_result:
if "code" in res and res["code"] == "error":
# assume error is "... file(s) not in client view"
continue
if "clientFile" not in res:
die("No clientFile from 'p4 where %s'" % depot_path)
if "unmap" in res:
# it will list all of them, but only one not unmap-ped
continue
self.client_spec_path_cache[res['depotFile']] = self.convert_client_path(res["clientFile"])

else:
# This mapping matched; no need to search any further.
# But, the mapping could be rejected if the client path
# has already been claimed by an earlier mapping (i.e.
# one later in the list, which we are walking backwards).
already_mapped_in_client = False
for f in paths_filled:
# this is View.Path.match
if f.match(p):
already_mapped_in_client = True
break
if not already_mapped_in_client:
# Include this file, unless it is from a line that
# explicitly said to exclude it.
if not m.exclude:
client_path = p
# not found files or unmap files set to ""
for depotFile in fileArgs:
if depotFile not in self.client_spec_path_cache:
self.client_spec_path_cache[depotFile] = ""

# a match, even if rejected, always stops the search
break
def map_in_client(self, depot_path):
"""Return the relative location in the client where this
depot file should live. Returns "" if the file should
not be mapped in the client."""

return client_path
if depot_path in self.client_spec_path_cache:
return self.client_spec_path_cache[depot_path]

die( "Error: %s is not found in client spec path" % depot_path )
return ""

class P4Sync(Command, P4UserMap):
delete_actions = ( "delete", "move/delete", "purge" )
Expand Down Expand Up @@ -2130,6 +2018,10 @@ def splitFilesIntoBranches(self, commit):
"""Look at each depotFile in the commit to figure out to what
branch it belongs."""

if self.clientSpecDirs:
files = self.extractFilesFromCommit(commit)
self.clientSpecDirs.update_client_spec_path_cache(files)

branches = {}
fnum = 0
while commit.has_key("depotFile%s" % fnum):
Expand Down Expand Up @@ -2379,6 +2271,9 @@ def commit(self, details, files, branch, parent = ""):
else:
sys.stderr.write("Ignoring file outside of prefix: %s\n" % f['path'])

if self.clientSpecDirs:
self.clientSpecDirs.update_client_spec_path_cache(files)

self.gitStream.write("commit %s\n" % branch)
# gitStream.write("mark :%s\n" % details["change"])
self.committedChanges.add(int(details["change"]))
Expand Down

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