Err, the DNF 2.0rc1 package in the COPR repo is actually equivalent to dnf-2.0.0-0.rc1.4.fc26 in Rawhide.

Please provide backtrace.

oops, wrong bug.

we'll fix this.

*** This bug has been marked as a duplicate of bug 1393595 ***

Any progress on this? I've not seen any pull requests related to this issue show up in DNF...

Just FTR, man pages say:

```
SPECIFYING TRANSACTIONS
       <transaction-spec>  can  be  in  one of several forms. If it is an integer, it specifies a transaction ID. Specifying --last is the same as specifying the ID of the most recent transaction. The last form is --last-<offset>, where <offset> is a positive integer. It specifies offset-th transaction preceding the most recent transaction.
```

So trying last:

```
$ sudo dnf history undo --last
usage: dnf history [-c [config file]] [-q] [-v] [--version]
                   [--installroot [path]] [--noplugins]
                   [--disableplugins [plugin]] [--releasever RELEASEVER]
                   [--setopt SETOPTS] [-h] [--allowerasing] [-b] [-C]
                   [-d [debug level]] [--debugsolver] [--showduplicates]
                   [-e ERRORLEVEL] [--rpmverbosity [debug level name]] [-y]
                   [--assumeno] [--enablerepo [repo]] [--disablerepo [repo] |
                   --repo [repo]] [-x [package]] [--disableexcludes [repo]]
                   [--repofrompath [repo,path]] [--nogpgcheck] [--color COLOR]
                   [--refresh] [-4] [-6] [--downloadonly]
                   [[list|info|redo|undo|rollback|userinstalled]
                   [[list|info|redo|undo|rollback|userinstalled] ...]]
dnf history: error: unrecognized arguments: --last
```

But I used to be to use just "last" without dashes when using YUM, but it fails with different error:

```
$ sudo dnf history undo last
Repository 'tiliado-nuvolaplayer' is missing name in configuration, using id.
Last metadata expiration check: 4:24:15 ago on Tue Nov 22 10:37:33 2016 CET.
Failed to synchronize cache for repo 'rcm-tools-fedora-rpms', disabling.
Failed to synchronize cache for repo 'tiliado-nuvolaplayer', disabling.
Bad transaction ID given
Error: Failed history undo
```

So you probably want to clarify the behavior/documentation ...

In document "doc/cli_vs_yum.rst" was documented that dnf considers last option as <package-ID>, but yum considered it as package name. So because of back compatibility it was renamed to "--last" option (Commit https://github.com/rpm-software-management/dnf/commit/1681a5fafbb66e115b8ab71ae9b374227aeb7c6c)

Few weeks later was changed handling or arguments and I found that "--last" option did not work. So I created PR (https://github.com/rpm-software-management/dnf/pull/584) that fixed that but after some discussion about doing this the right way we found out that there was mistake in "doc/cli_vs_yum.rst" and dnf worked as yum.

Unfortunately argparser is not able to handle this option in some new pretty way so we need to apply old parsing of "last" option to new argparser.

(In reply to Štěpán Smetana from comment #8)
> Unfortunately argparser is not able to handle this option in some new pretty
> way so we need to apply old parsing of "last" option to new argparser.

Yep, YUM always accepted just plain "last" as far as I remember, so this plan works for me.

Fixed in
https://github.com/rpm-software-management/dnf/pull/659

Verified that it's fixed:

```
[ngompa@mgacauldron-dnftst Music]$ sudo dnf history info last
Last metadata expiration check: 0:01:58 ago on Thu Nov 24 10:40:27 2016 EST.
Transaction ID : 90
Begin time     : Thu Nov 24 10:42:01 2016
Begin rpmdb    : 2623:fef133c1f4cd41f0af864d6b9d9dffde4e203958
End time       :            10:42:09 2016 (8 seconds)
End rpmdb      : 2623:633bc9ecb97873fcf3dd271784b2fe599cff3b6f
User           : System <unset>
Return-Code    : Success
Command Line   : --best --allowerasing install dnf
Transaction performed with:
    Upgraded      dnf-2.0.0-0.0.1.rc1.mga6.noarch @ngompa-dnf2-mga
    Installed     1:rpm-4.13.0-2.mga6.x86_64      @cauldron-x86_64
Packages Altered:
    Upgraded dnf-2.0.0-0.0.1.rc1.mga6.noarch         @ngompa-dnf2-mga
    Upgrade      2.0.0-0.0.3.rc1.mga6.noarch         @ngompa-dnf2-mga
    Upgraded dnf-conf-2.0.0-0.0.1.rc1.mga6.noarch    @ngompa-dnf2-mga
    Upgrade           2.0.0-0.0.3.rc1.mga6.noarch    @ngompa-dnf2-mga
    Upgraded dnf-yum-2.0.0-0.0.1.rc1.mga6.noarch     @ngompa-dnf2-mga
    Upgrade          2.0.0-0.0.3.rc1.mga6.noarch     @ngompa-dnf2-mga
    Upgraded python3-dnf-2.0.0-0.0.1.rc1.mga6.noarch @ngompa-dnf2-mga
    Upgrade              2.0.0-0.0.3.rc1.mga6.noarch @ngompa-dnf2-mga

```

Fixed with the dnf 2.0rc2 builds in rawhide.