Re: [PATCH] properly quote strings tested with -n

[Alex Elder <elder@ieee.org>]

On 10/01/2015 08:30 AM, Eric Sandeen wrote:
> Ping?

I no longer have your original message.  But this is
one I know and love (hate) from past experience with shell
scripting.  I eventually started always using "${FOO}"
in scripts to make sure I never had to chase down this
sort of bug, ever again.

I did not look at the whole set of fstests code
to see if you hit them all, but everything I see
here looks good.

Reviewed-by: Alex Elder <elder@linaro.org>

> On 8/28/15 5:46 PM, Eric Sandeen wrote:
>> Per the Advanced Bash Scripting Guide:
>>
>> "The -n test requires that the string be quoted within the test brackets.
>> Using an unquoted string with ! -z, or even just the unquoted string
>> alone within test bracket normally works, however, this is an unsafe
>> practice. Always quote a tested string."
>>
>> And indeed:
>>
>> $ unset FOOBAR
>> $ [ -n $FOOBAR ] || echo nope
>> $ [ -n "$FOOBAR" ] || echo nope
>> nope
>>
>> Ran into this on a box w/o the attr program installed, and passed
>> _require_attrs.  Quoting the string fixes this; fix it there
>> and other occurrences in common/* as well.
>>
>> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
>> ---
>>
>> diff --git a/common/attr b/common/attr
>> index 48c81cc..cc9cfda 100644
>> --- a/common/attr
>> +++ b/common/attr
>> @@ -165,7 +165,7 @@ _filter_aces_notypes()
>>  
>>  _require_acls()
>>  {
>> -    [ -n $CHACL_PROG ] || _notrun "chacl command not found"
>> +    [ -n "$CHACL_PROG" ] || _notrun "chacl command not found"
>>  
>>      #
>>      # Test if chacl is able to list ACLs on the target filesystems.  On really
>> @@ -196,9 +196,9 @@ _list_acl()
>>  
>>  _require_attrs()
>>  {
>> -    [ -n $ATTR_PROG ] || _notrun "attr command not found"
>> -    [ -n $GETFATTR_PROG ] || _notrun "getfattr command not found"
>> -    [ -n $SETFATTR_PROG ] || _notrun "setfattr command not found"
>> +    [ -n "$ATTR_PROG" ] || _notrun "attr command not found"
>> +    [ -n "$GETFATTR_PROG" ] || _notrun "getfattr command not found"
>> +    [ -n "$SETFATTR_PROG" ] || _notrun "setfattr command not found"
>>  
>>      #
>>      # Test if chacl is able to write an attribute on the target filesystems.
>> diff --git a/common/quota b/common/quota
>> index 23be4f8..658b1c3 100644
>> --- a/common/quota
>> +++ b/common/quota
>> @@ -26,7 +26,7 @@
>>  #
>>  _require_quota()
>>  {
>> -    [ -n $QUOTA_PROG ] || _notrun "Quota user tools not installed"
>> +    [ -n "$QUOTA_PROG" ] || _notrun "Quota user tools not installed"
>>  
>>      case $FSTYP in
>>      ext2|ext3|ext4|ext4dev|reiserfs)
>> @@ -74,7 +74,7 @@ _require_xfs_quota()
>>      if [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ]; then
>>  	_notrun "Quotas not supported on realtime scratch device"
>>      fi
>> -    [ -n $XFS_QUOTA_PROG ] || _notrun "XFS quota user tools not installed"
>> +    [ -n "$XFS_QUOTA_PROG" ] || _notrun "XFS quota user tools not installed"
>>  }
>>  
>>  #
>>
>> --
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