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.

tests/test-dispatch

@@ -1,33 +1,33 b''
 #!/bin/sh
 # test command parsing and dispatch
 
 "$TESTDIR/hghave" no-outer-repo || exit 80
 
 dir=`pwd`
 
 hg init a
 cd a
 echo a > a
 hg ci -Ama
 
 echo "# missing arg"
 hg cat
 
 echo '% [defaults]'
 hg cat a
 cat >> $HGRCPATH <<EOF
 [defaults]
 cat = -r null
 EOF
 hg cat a
 
 echo '% working directory removed'
-rm -rf $dir/a
-hg --version
+sh -c "cd $dir && rm -rf a"
+hg --version 2>&1 | sed -e 's,\(abort:.*:\).*$,\1 ...,g'
 
 echo '% no repo'
 cd $dir
 hg cat
 
 exit 0
 

tests/test-dispatch.out

@@ -1,39 +1,39 b''
 adding a
 # missing arg
 hg cat: invalid arguments
 hg cat [OPTION]... FILE...
 
 output the current or given revision of files
 
     Print the specified files as they were at the given revision. If no
     revision is given, the parent of the working directory is used, or tip if
     no revision is checked out.
 
     Output may be to a file, in which case the name of the file is given using
     a format string. The formatting rules are the same as for the export
     command, with the following additions:
 
     "%s"  basename of file being printed
     "%d"  dirname of file being printed, or '.' if in repository root
     "%p"  root-relative path name of file being printed
 
     Returns 0 on success.
 
 options:
 
  -o --output FORMAT        print output to file with formatted name
  -r --rev REV              print the given revision
     --decode               apply any matching decode filter
  -I --include PATTERN [+]  include names matching the given patterns
  -X --exclude PATTERN [+]  exclude names matching the given patterns
 
 [+] marked option can be specified multiple times
 
 use "hg -v help cat" to show global options
 % [defaults]
 a
 a: No such file in rev 000000000000
 % working directory removed
-abort: error getting current working directory: No such file or directory
+abort: error getting current working directory: ...
 % no repo
 abort: There is no Mercurial repository here (.hg not found)!