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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="introduction-errors"></a>Error Enums</h2></div></div></div>
<p>
If you have to handle an error, try to use <code class="literal">internal-error</code>
as little as possible.
Just ask on the mailing list, and we can add some more error enums to
cover the type of error in an abstract way as possible.
</p>
<p>
Every error should have an enumerated type
(e.g. <code class="literal">out-of-memory</code>) and also an error description.
The error description is not translated and not converted into the users
locale.
The error description should be descriptive, as it's for power users
and people trying to debug the problem.
For instance, "Out of memory" is not helpful as an error description
that is reported in a bugzilla, but "Could not create database index" is.
For the description use <code class="literal">;</code> to separate the lines if
required.
</p>
<p>
The following error enumerated types are available for use in all
backends:
</p>
<div class="informaltable"><table class="informaltable" border="1">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Error</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><code class="literal">out-of-memory</code></td>
<td>There is an out of memory condition</td>
</tr>
<tr>
<td><code class="literal">no-network</code></td>
<td>There is no network connection that can be used</td>
</tr>
<tr>
<td><code class="literal">not-supported</code></td>
<td>
Not supported by the backend.
NOTE: You shouldn't be setting non-NULL in the compiled
backend symbol table if you find yourself using this.
</td>
</tr>
<tr>
<td><code class="literal">internal-error</code></td>
<td>
There was an unspecified internal error.
NOTE: Please try and be more specific.
If you are using this then we should probably add a new type.
</td>
</tr>
<tr>
<td><code class="literal">no-cache</code></td>
<td>
The operation is trying to read from the cache, but the cache
is not present or invalid
</td>
</tr>
<tr>
<td><code class="literal">gpg-failure</code></td>
<td>There was a GPG failure in the transaction</td>
</tr>
<tr>
<td><code class="literal">package-id-invalid</code></td>
<td>The package ID is not valid for this transaction</td>
</tr>
<tr>
<td><code class="literal">package-not-installed</code></td>
<td>
The package that is trying to be removed or updated is not
installed
</td>
</tr>
<tr>
<td><code class="literal">package-not-found</code></td>
<td>
The package that is trying to be removed or updated is not
installed
</td>
</tr>
<tr>
<td><code class="literal">package-already-installed</code></td>
<td>
The (single) package that is trying to be installed or updated is already
installed
</td>
</tr>
<tr>
<td><code class="literal">all-packages-already-installed</code></td>
<td>
Multiple package installs were attempted, but all of
them were already installed. The backend should
generate package-already-installed messages (not errors)
for each package.
</td>
</tr>
<tr>
<td><code class="literal">package-download-failed</code></td>
<td>A package failed to download correctly</td>
</tr>
<tr>
<td><code class="literal">invalid-package-file</code></td>
<td>
The file that is supposed to contain a package to
install is corrupt, or is not a valid package file
</td>
</tr>
<tr>
<td><code class="literal">package-install-blocked</code></td>
<td>
The backend's configuration or policy prevents the
install or updating of a package
</td>
</tr>
<tr>
<td><code class="literal">dep-resolution-failed</code></td>
<td>Dependency resolution failed</td>
</tr>
<tr>
<td><code class="literal">filter-invalid</code></td>
<td>
The filter was invalid.
NOTE: syntax checking is done in the backend loader, so you
should only use this if the filter is not supported by the
backend.
</td>
</tr>
<tr>
<td><code class="literal">group-not-found</code></td>
<td>
The specified software group was not found.
</td>
</tr>
<tr>
<td><code class="literal">create-thread-failed</code></td>
<td>Failed to create a thread</td>
</tr>
<tr>
<td><code class="literal">transaction-error</code></td>
<td>
There was a generic transaction error, but please give more
details in the description
</td>
</tr>
<tr>
<td><code class="literal">transaction-cancelled</code></td>
<td>
The transaction was cancelled as the result of a call
to Cancel()
</td>
</tr>
<tr>
<td><code class="literal">repo-not-found</code></td>
<td>The repository name could not be found</td>
</tr>
<tr>
<td><code class="literal">repo-configuration-error</code></td>
<td>One of the enabled repositories has invalid configuration</td>
</tr>
<tr>
<td><code class="literal">repo-not-available</code></td>
<td>
There was a (possibly transient) problem connecting to a
repository
</td>
</tr>
<tr>
<td><code class="literal">cannot-remove-system-package</code></td>
<td>
Could not remove a protected system package that is needed for
stable operation of the system
</td>
</tr>
<tr>
<td><code class="literal">process-quit</code></td>
<td>
The process was asked to quit, probably because it was cancelled
</td>
</tr>
<tr>
<td><code class="literal">process-kill</code></td>
<td>
The process was forcibly killed, probably because ignored the
quit request. This is probably due to it being cancelled
</td>
</tr>
<tr>
<td><code class="literal">failed-config-parsing</code></td>
<td>
Configuration files could not be read or parsed.
</td>
</tr>
<tr>
<td><code class="literal">cannot-cancel</code></td>
<td>
The Cancel() method was called, but it is too late to
cancel the current transaction.
</td>
</tr>
<tr>
<td><code class="literal">cannot-get-lock</code></td>
<td>
The backend could not acquire a lock on the underlying
package management system.
</td>
</tr>
<tr>
<td><code class="literal">no-packages-to-update</code></td>
<td>
UpdatePackages() was called, but there are no packages to update.
</td>
</tr>
<tr>
<td><code class="literal">cannot-write-repo-config</code></td>
<td>
RepoEnable() or RepoSetData() was called, but the
repository configuration file could not be written to.
</td>
</tr>
<tr>
<td><code class="literal">local-install-failed</code></td>
<td>
A local file could not be installed. The file might not
be readable, or it might not contain a valid package.
</td>
</tr>
<tr>
<td><code class="literal">bad-gpg-signature</code></td>
<td>
The package is signed with a GPG signature, but that
signature is not valid in some way.
</td>
</tr>
<tr>
<td><code class="literal">package-corrupt</code></td>
<td>
The downloaded package is corrupt.
</td>
</tr>
<tr>
<td><code class="literal">file-not-found</code></td>
<td>
The file could not be found on the system.
</td>
</tr>
</tbody>
</table></div>
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