Fixed a bashism with the use of $RANDOM in hgeditor.
The variable $RANDOM is not POSIX so a portable /bin/sh may not define
it. When creating a directory with a random name it's better to use
mktemp, which, even though is not POSIX, exists in common Unixes
including Linux, OpenBSD, FreeBSD and MacOS X.
#! /bin/sh
# issue 1678
echo "# -- setting up base repo"
hg init a
cd a
touch a
hg ci -Am a
cd ..
echo "# -- cloning base repo"
hg clone a b
cd b
echo "# -- setting up cset to push"
hg up null
touch a
hg ci -Am b # different msg so we get a clog new entry
echo "# -- pushing"
hg push -f ../a