tests/test-debugindexdot

test-dispatch: Make test of removed working directory work on AIX (issue2315)

AIX sh won't delete its own working directory. Removing it from another process
works.

Also hide the actual OS error message - operating systems returns different
errors when getcwd fails.

#!/bin/sh

# Just exercize debugindexdot
# Create a short file history including a merge.
hg init t
cd t
echo a > a
hg ci -qAm t1 -d '0 0'
echo a >> a
hg ci -m t2 -d '1 0'
hg up -qC 0
echo b >> a
hg ci -m t3 -d '2 0'
HGMERGE=true hg merge -q
hg ci -m merge -d '3 0'

hg debugindexdot .hg/store/data/a.i