Commit 8c0d99d fixes support for getting the mac address through the ip command. After patching it myself, I figured out the solution was already in master. Maybe this fix deserves a new gem release, as the ip command will be more and more common?

/usr/local/lib/ruby/gems/1.9.1/gems/uuidtools-2.1.2/lib/uuidtools.rb:399: warning: instance variable @string not initialized

I get the the error "Use RbConfig instead of obsolete and deprecated Config" with Ruby 1.9.3. Would it be possible to fix this in the next version of uuidtools?

UUIDTools::UUID.sha1_create(UUIDTools::UUID_DNS_NAMESPACE, "http://github.com").to_s
=> "de33c012-0cb8-5281-8f42-768c47f00bd7"

UUIDTools::UUID.sha1_create(UUIDTools::UUID_DNS_NAMESPACE, "http://github.com").to_s
=> "de33c012-0cb8-5281-8f42-768c47f00bd7"

Hello,

I've found in Gentoo a bug where uuidtools does not pass tests because it can't find a MAC address for the host. -The reason is relatively simple: the host has no IPv4 so the trick with ifconfig+arp will fail.- Edit: I read the logic wrong, the arp trick is for Solaris. There still is some problems as ifconfig on a hardened LXC guest does not report the ethernet address, trying to find out why right now.

I'm working on changing the code to look for the ethernet address on the ifconfig output directly — it's going to be slightly tricky because there are two possible output styles for ifconfig, and at some point it might even disappear in favour of the ip command.

Anyway I'll submit a patch shortly.

https://rubygems.org/gems/uuidtools/versions/2.1.3

But there is no corresponding tag on github. If you use the bundler provided tasks to release to github tagging will be taken care of automatically in the future.

to_s on a uuid object seems to reference internal state, for example:

u = UUIDTools::UUID.random_create
>> #<UUID:0x1ab59b7df8 UUID:c08bf74a-98c5-4d82-bb96-e8dbaa1e1dfb>

u.to_s.gsub! '-', '/'
=> "c08bf74a/98c5/4d82/bb96/e8dbaa1e1dfb"

u
=> #<UUID:0x1ab59b7df8 UUID:c08bf74a/98c5/4d82/bb96/e8dbaa1e1dfb>

I get around the issue by using dup:

u.to_s.dup.gsub! '-', '/'

The results of to_s should be immutable with respect to the uuid object state.

There have been a couple of bug fixes since the last gem version. Any chance of there being new one released?

Hi,

I open a new issue since the rspec output as changed (from this previous issue #12 ):

I copy paste the entire output :

Warning: cannot open /proc/net/dev (No such file or directory). Limited output.
F...............*............Warning: cannot open /proc/net/dev (No such file or directory). Limited output.
F..................F...............

Pending:
  UUIDTools::UUID before obtaining a MAC address should return the output of the ifconfig program
    # I'm not quite sure how to mock backticks
    # ./spec/uuidtools/mac_address_spec.rb:418

Failures:

  1) UUIDTools::UUID when obtaining a MAC address should obtain a MAC address
     Failure/Error: @mac_address.should_not be_nil
       expected: not nil
            got: nil
     # ./spec/uuidtools/mac_address_spec.rb:243:in `block (2 levels) in <top (required)>'

  2) UUIDTools::UUID when generating should correctly generate timestamp variant UUIDs
     Failure/Error: UUIDTools::UUID.timestamp_create.should_not be_random_node_id
       expected random_node_id? to return false, got true
     # ./spec/uuidtools/uuid_creation_spec.rb:17:in `block (2 levels) in <top (required)>'

  3) UUIDTools::UUID when parsing should not treat a timestamp version UUID as a random node UUID
     Failure/Error: UUIDTools::UUID.timestamp_create.should_not be_random_node_id
       expected random_node_id? to return false, got true
     # ./spec/uuidtools/uuid_parsing_spec.rb:27:in `block (2 levels) in <top (required)>'

Finished in 0.1865 seconds
64 examples, 3 failures, 1 pending

Failed examples:

rspec ./spec/uuidtools/mac_address_spec.rb:241 # UUIDTools::UUID when obtaining a MAC address should obtain a MAC address
rspec ./spec/uuidtools/uuid_creation_spec.rb:16 # UUIDTools::UUID when generating should correctly generate timestamp variant UUIDs
rspec ./spec/uuidtools/uuid_parsing_spec.rb:26 # UUIDTools::UUID when parsing should not treat a timestamp version UUID as a random node UUID

I used a new docker image to boot up an older Rails application that depends on the uuidtools gem, specifically the UUIDTools::UUID.timestamp_create method. After the image update, I was seeing a these errors in rspec tests:

      Failure/Error: uuid { UUIDTools::UUID.timestamp_create.to_s }
      
      NoMethodError:
        undefined method `[]' for nil:NilClass

This comes from the assumption that /sbin/ip will exist, at

My solution was to add the OS package that included the ifconfig command (which was smaller than the one that included the ip command).

Noticed this in the log: 'which' is not recognized as an internal or external command,
operable program or batch file.

Changed line 418 to:
if (os_platform =~ /win/ && !(os_platform =~ /darwin/)) || os_platform =~ /w32/

That fixes it.

Here's the new fix, next time I'll just fork this and let you pull in the fix if there is anything else:

Line 415:
windoze = os_platform =~ (/win/ && !(os_platform =~ /darwin/)) ||
os_platform =~ /w32/
if windoze
script_in_path = true
.....

Line 446ish:
elsif windoze
begin
ifconfig_output = ipconfig /all
mac_addresses = ifconfig_output.scan(

I'm had been using uuidtools gem for years, thanks for it! 👍

Because the last commit is from Aug 11, 2015, I'm thinking of using another UUID generator,
Are there better alternatives nowadays? In your opinion whats the best UUID generator in ruby (as 2017)?

Is there anyway to create unique alphanumeric length limited strings with UUIDTools?

I get constant not found error

I installed uuidtools in Windows 7 x64 with the command:

jruby -S gem install uuidtools

have written a helper:

require 'rubygems'
require 'uuidtools'

module UUIDHelper
  def self.parse(uuidstring)
    self.uuid = UUID.parse(uuidstring)
  end
  def before_create()
    self.uuid = UUID.timestamp_create().to_s
  end
end

but can't get the application to work.
The error message is:

no such file to load -- uuidtools

I searched web pages, tried all possible advices, restarted my Webrick 20 times - still no result.
By clicking "Go to declaration" on timestamp_create, NetBeans opens uuidtools.rb - so it CAN find uuidtools.
What could be wrong?

irb(main):001:0> require 'uuidtools'
LoadError: no such file to load -- uuidtools
        from org/jruby/RubyKernel.java:1038:in 'require'
        from (irb):1:in 'evaluate'
        from org/jruby/RubyKernel.java:1088:in 'eval'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:158:in 'eval_input'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:271:in 'signal_status'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:155:in 'eval_input'
        from org/jruby/RubyKernel.java:1419:in 'loop'
        from org/jruby/RubyKernel.java:1191:in 'catch'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:154:in 'eval_input'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:71:in 'start'
        from org/jruby/RubyKernel.java:1191:in 'catch'
        from C:/Program Files/jruby-1.6.4/lib/ruby/1.8/irb.rb:70:in 'start'
        from C:\Program Files\jruby-1.6.4\bin\irb:13:in '(root)'

Process Monitor shows me for "require" command:

Operation: CreateFile
Result: PATH NOT FOUND
Path:   C:\Program Files\jruby-1.6.4\lib\ruby\gems\1.8\gems\uuidtools-2.1.2\rubyjit\debug?_69049681550F92840CD2088A74CA3191A61CC9CA.class
TID:    160
Desired Access: Read Attributes
Disposition:    Open
Options:    Open Reparse Point
Attributes: n/a
ShareMode:  Read, Write, Delete
AllocationSize: n/a

P.S. It seems to be a general problem with JRuby. Other modules behave in such manner too - they can't be loaded from an application, but from irb they are loaded without problems.

Hey,

I am receiving the following error on Jessie os using the timestamp_create method.

[1] pry(main)> UUIDTools::UUID.timestamp_create
Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }
       ip [ -force ] -batch filename
where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |
                   tunnel | tuntap | maddr | mroute | mrule | monitor | xfrm |
                   netns | l2tp | tcp_metrics | token | netconf }
       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |
                    -f[amily] { inet | inet6 | ipx | dnet | bridge | link } |
                    -4 | -6 | -I | -D | -B | -0 |
                    -l[oops] { maximum-addr-flush-attempts } |
                    -o[neline] | -t[imestamp] | -b[atch] [filename] |
                    -rc[vbuf] [size]}
NoMethodError: undefined method `split' for nil:NilClass
from /usr/local/bundle/gems/uuidtools-2.1.4/lib/uuidtools.rb:611:in `first_mac'

I have looked into it in a bit of detail, Jessie uses ip instead of ifconfig and the code for the gem does the following:

all_switch = all == nil ? "" : "-a"

The "-a" options seem to be incorrect options for ip service. Should be 'device a'

root@651fc07a3a3a:r# ip -a
Option "-a" is unknown, try "ip -help".

when running as a windows service i got this error:

uninitialized class variable @@mac_address in UUIDTools::UUID
C:/Ruby/lib/ruby/gems/1.9.1/gems/uuidtools-2.1.2/lib/uuidtools.rb:590:in `mac_address'

if the same code runs inside cmd.exe it works without any problem.

my code is:

uuid = UUIDTools::UUID.mac_address.to_s

thank you.

UUIDTools::UUID.random_create does generate valid Version 4 (Random) UUIDs, but if I parse an invalid UUID like this:

uuid = UUIDTools::UUID.parse('4e062a1e-31bd-4dc2-76b8-bf8c207c52d4')

then uuid.valid? returns true and it should return false since the third group (76b8) starts with a 7, not with, a, b, 8 or 9.

http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_.28random.29

ArgumentError in 'UUIDTools::UUID when parsing should correctly parse integers'
invalid byte sequence in US-ASCII
/var/tmp/portage/dev-ruby/uuidtools-2.1.0/work/uuidtools-2.1.0/spec/uuidtools/uuid_parsing_spec.rb:115:in block (2 levels) in <top (required)>' /usr/lib64/ruby19/1.9.1/timeout.rb:44:intimeout'

ArgumentError in 'UUIDTools::UUID when parsing should correctly parse hexdigests'
invalid byte sequence in US-ASCII
/var/tmp/portage/dev-ruby/uuidtools-2.1.0/work/uuidtools-2.1.0/spec/uuidtools/uuid_parsing_spec.rb:125:in block (2 levels) in <top (required)>' /usr/lib64/ruby19/1.9.1/timeout.rb:44:intimeout'

Finished in 0.323076154 seconds

41 examples, 2 failures
rake aborted!
Command /usr/bin/ruby19 -I"lib" "/usr/lib64/ruby19/gems/1.9.1/gems/rspec-1.2.9/bin/spec" "spec/uuidtools/uuid_parsing_spec.rb" "spec/uuidtools/mac_address_spec.rb" "spec/uuidtools/utility_spec.rb" "spec/uuidtools/uuid_creation_spec.rb" --color --format specdoc failed