bug triggered by long file names in cygwin 1.7.0-52

[Dan Stratila]

Hello,

I just installed Cygwin 1.7.0-52, and now rdiff-backup is able to work with
path names longer than 260 characters when backing up. Very nice.

However, when I open a standard bash prompt and attempt to cd into such a
directory, it crashes:

---
dstrat@thelaptop /cygdrive/d/work/scratch
$ cd lfn_test/

dstrat@thelaptop /cygdrive/d/work/scratch/lfn_test
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

dstrat@thelaptop
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901
23456789012345678901234567890123456789012345678901234567890
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

dstrat@thelaptop
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901
23456789012345678901234567890123456789012345678901234567890/LFN_123456789012
345678901234567890123456
7890123456789012345678901234567890123456789012345678901234567890
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

(Console window disappears switftly and without any error messages)
---

After thinking about this for a bit, I realized that the problem is related
to the fact that bash sets the window title to the current path. When I
change PS1 to only place the basename of the current path in the window
title, the crash no longer happens:

---
dstrat@thelaptop /cygdrive/d/work/scratch
$ PS1='\[\e]0;\W\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '

dstrat@thelaptop /cygdrive/d/work/scratch
$ cd lfn_test/

dstrat@thelaptop /cygdrive/d/work/scratch/lfn_test
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

dstrat@thelaptop
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901
23456789012345678901234567890123456789012345678901234567890
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

dstrat@thelaptop
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901
23456789012345678901234567890123456789012345678901234567890/LFN_123456789012
345678901234567890123456
7890123456789012345678901234567890123456789012345678901234567890
$ cd
LFN_123456789012345678901234567890123456789012345678901234567890123456789012
345678901234567890
1234567890/

dstrat@thelaptop
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901
23456789012345678901234567890123456789012345678901234567890/LFN_123456789012
345678901234567890123456
7890123456789012345678901234567890123456789012345678901234567890/LFN_1234567
890123456789012345678901
234567890123456789012345678901234567890123456789012345678901234567890
$ pwd
/cygdrive/d/work/scratch/lfn_test/LFN_12345678901234567890123456789012345678
901234567890123456789
01234567890123456789012345678901234567890/LFN_123456789012345678901234567890
123456789012345678901234
5678901234567890123456789012345678901234567890/LFN_1234567890123456789012345
678901234567890123456789
012345678901234567890123456789012345678901234567890
---

So my guess is that somewhere in the code that sets the window title, either
on the Cygwin side or the Windows side, there is a limitation on the length
of the title.

Sincerely,
Dan
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