Timo Sirainen <t...@iki.fi> (Do 12 Nov 2015 23:12:21 CET): … > > The user has about 4501 IMAP folders. This makes a huge > > state output of about 128 kB. This in turn leads to an overly long > > command line in the next iteration. (excuse: command line too long) > > > > Is there any chance to solve this? I think, the only possibility would > > be to have doveadm-backup -s read the state from a *file*, wouldn't it? > > Right now no way to read it from a file. But is this Linux? I thought Linux > had unlimited (or at least very large) command line length nowadays.
Yes, the product of size and number of the arguments is limited:
*** 189961 args ( 10 chars each) with total length 1899610
*** 99503 args ( 20 chars each) with total length 1990060
*** 2087 args ( 1000 chars each) with total length 2087000
*** 16 args (128000 chars each) with total length 2048000
The upper limit for the sum of parameters seems to be ~2 MB
But,
x127=$(perl -e 'print "x" x (127 * 2**10)') # 127 KB
x128=$(perl -e 'print "x" x (128 * 2**10)') # 128 KB
/bin/echo $x127 # works
/bin/echo $x127 $x127 # works
/bin/echo $x128 # breaks
/bin/echo $x128 $x128 # breaks
It seems that a *single* command line parameter is limited to somewhat
near 128 kB. The complete amount of command line data is near 2 MB.
Conclusion: doveadm sync should be able to read a state *file*. IMHO
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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