bdiff: fix malloc(0) issue in fixws()
If fixws() is called on a zero-length string, malloc(0) is called and
expected to return a pointer. Which it does on e.g. Linux. AIX returns
NULL, which it is also legal, but the malloc() is then assumed to have
failed. So ensure a valid pointer is always returned.
$ "$TESTDIR/hghave" unix-permissions || exit 80
No local source
$ hg clone a b
abort: repository a not found!
[255]
No remote source
$ hg clone http://127.0.0.1:3121/a b
abort: error: Connection refused
[255]
$ rm -rf b # work around bug with http clone
Inaccessible source
$ mkdir a
$ chmod 000 a
$ hg clone a b
abort: repository a not found!
[255]
Inaccessible destination
$ hg init b
$ cd b
$ hg clone . ../a
abort: Permission denied: ../a
[255]
$ cd ..
$ chmod 700 a
$ rm -r a b
Source of wrong type
$ if "$TESTDIR/hghave" -q fifo; then
> mkfifo a
> hg clone a b
> rm a
> else
> echo "abort: repository a not found!"
> fi
abort: repository a not found!
Default destination, same directory
$ hg init q
$ hg clone q
destination directory: q
abort: destination 'q' is not empty
[255]
destination directory not empty
$ mkdir a
$ echo stuff > a/a
$ hg clone q a
abort: destination 'a' is not empty
[255]
leave existing directory in place after clone failure
$ hg init c
$ cd c
$ echo c > c
$ hg commit -A -m test
adding c
$ chmod -rx .hg/store/data
$ cd ..
$ mkdir d
$ hg clone c d 2> err
[255]
$ test -d d
$ test -d d/.hg
[1]
reenable perm to allow deletion
$ chmod +rx c/.hg/store/data