git-p4 fails when cloning a p4 depo.

A perforce command with all the files in the repo is generated to get
all the file content.
Here is a patch to break it into multiple successive perforce command
who uses 4K of parameter max, and collect the output for later.

It works, but not for big depos, because the whole perforce depo
content is stored in memory in P4Sync.run(), and it looks like mine is
bigger than 2 Gigs, so I had to kill the process.

[Simon: I added the bit about using SC_ARG_MAX, as suggested by Han-Wen]

Signed-off-by: Benjamin Sergeant <bsergean@gmail.com>
Signed-off-by: Simon Hausmann <simon@lst.de>

diff --git a/contrib/fast-import/git-p4 b/contrib/fast-import/git-p4
index e527734be5af0fef713a8d8241de57cb5f2cbb5e..d1f8d3b78d12c95e580750c3c0b02d54865f5da5 100755 (executable)
--- a/contrib/fast-import/git-p4
+++ b/contrib/fast-import/git-p4
@@ -711,9 +711,23 @@ class P4Sync(Command):
         if not files:
             return
 
-        filedata = p4CmdList('print %s' % ' '.join(['"%s#%s"' % (f['path'],
-                                                                 f['rev'])
-                                                    for f in files]))
+        # We cannot put all the files on the command line
+        # OS have limitations on the max lenght of arguments
+        # POSIX says it's 4096 bytes, default for Linux seems to be 130 K.
+        # and all OS from the table below seems to be higher than POSIX.
+        # See http://www.in-ulm.de/~mascheck/various/argmax/
+        argmax = min(4000, os.sysconf('SC_ARG_MAX'))
+        chunk = ''
+        filedata = []
+        for i in xrange(len(files)):
+            f = files[i]
+            chunk += '"%s#%s" ' % (f['path'], f['rev'])
+            if len(chunk) > argmax or i == len(files)-1:
+                data = p4CmdList('print %s' % chunk)
+                if "p4ExitCode" in data[0]:
+                    die("Problems executing p4. Error: [%d]." % (data[0]['p4ExitCode']));
+                filedata.extend(data)
+                chunk = ''
 
         j = 0;
         contents = {}