convert: use None value for missing files instead of overloading IOError
The internal API used IOError to indicate that a file should be marked as
removed.
There is some correlation between IOError (especially with ENOENT) and files
that should be removed, but using IOErrors to represent file removal internally
required some hacks.
Instead, use the value None to indicate that the file not is present.
Before, spurious IO errors could cause commits that silently removed files.
They will now be reported like all other IO errors so the root cause can be
fixed.
# this file holds the definitions that are used in various bzr tests
"$TESTDIR/hghave" bzr || exit 80
TERM=dumb; export TERM
echo '[extensions]' >> $HGRCPATH
echo 'convert = ' >> $HGRCPATH
glog()
{
hg log -G --template '{rev}@{branch} "{desc|firstline}" files: {files}\n' "$@"
}
manifest()
{
echo "% manifest of $2"
hg -R $1 manifest -v -r $2
}