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href="/docs/extensions"><span itemprop="name">Writing extensions</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/extensions/write"><span itemprop="name">Writing</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">When clause contexts</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type="button" class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><h1>When clause contexts</h1>
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<p>Podman Desktop uses when clauses to enable or disable extensions command and UI customizations, such as views.</p>
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<p>For example, the Kind extension adds a custom icon to a container that has a label equals to <code>io.x-k8s.kind.cluster</code> by using the following instruction.</p>
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<div class="language-json codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-json codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token property">"views"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token property">"icons/containersList"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token property">"when"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"io.x-k8s.kind.cluster in containerLabelKeys"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token property">"icon"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"${kind-icon}"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<p>A when clause can consist of a context key (such as <code>isLinux</code>) or complex expressions to define a specific state.</p>
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<h3 class="anchor anchorWithStickyNavbar_JmGV" id="available-context-keys">Available context keys<a href="#available-context-keys" class="hash-link" aria-label="Direct link to Available context keys" title="Direct link to Available context keys"></a></h3>
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<p>Podman Desktop has a set of context keys that are evaluated to Boolean true/false.</p>
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<table><thead><tr><th>Context key</th><th>True when</th></tr></thead><tbody><tr><td><strong>Operating system contexts</strong></td><td></td></tr><tr><td>isLinux</td><td>True when the OS is Linux.</td></tr><tr><td>isWindows</td><td>True when the OS is Windows.</td></tr><tr><td>isMac</td><td>True when the OS is macOS.</td></tr></tbody></table>
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<p>Podman Desktop also provides context keys that return values that can be used to create meaningful expressions</p>
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<table><thead><tr><th>Context key</th><th>Value in it</th></tr></thead><tbody><tr><td>containerLabelKeys</td><td>A list of all labels belonging to the current container. Example: <code>"value in containerLabelKeys"</code></td></tr><tr><td>selectedImageId</td><td>The image id which the dashboard/image menu opened belong to. Example <code>"selectedImageId in imagesPushInProgressToKind"</code></td></tr></tbody></table>
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<h3 class="anchor anchorWithStickyNavbar_JmGV" id="add-a-custom-when-clause-context">Add a custom when clause context<a href="#add-a-custom-when-clause-context" class="hash-link" aria-label="Direct link to Add a custom when clause context" title="Direct link to Add a custom when clause context"></a></h3>
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<p>If you are creating your own extension and none of the existing keys suit your needs, you can set your own context key by calling the function <code>setValue(key: string, value: any, scope?: 'onboarding')</code> provided by the <code>context</code> namespace in the Podman Desktop API.</p>
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<p>The scope, if specified, triggers a custom behavior to avoid any type of collisions between different extensions for that specific scope. Podman Desktop is responsible for handling its state and cleans it accordingly when necessary.</p>
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<p>If omitted, the key/value is set globally. For this reason it is recommended to use the extension id as part of the key to avoid unexpected collisions with other extensions.</p>
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<p>The first example below sets the key <code>"podmanIsInstalled"</code> to true globally while the second example sets the key <code>"toolInstalled"</code> to <code>oc.exe</code> using the onboarding scope.</p>
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<div class="codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-text codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> extensionsAPI.context.setValue('podmanIsInstalled', true);</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> extensionsAPI.context.setValue('toolInstalled', 'oc.exe', 'onboarding');</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<p>After setting the <code>toolInstalled</code> to <code>oc.exe</code>, you could use this information in the <code>when</code> clause to enable something</p>
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<div class="language-json codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-json codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token property">"when"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"onboardingContext:toolInstalled == oc.exe"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<h3 class="anchor anchorWithStickyNavbar_JmGV" id="conditional-operators">Conditional operators<a href="#conditional-operators" class="hash-link" aria-label="Direct link to Conditional operators" title="Direct link to Conditional operators"></a></h3>
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<p>To create <code>when</code> clauses a bit more complex Podman Desktop offers a set of operators that can be combined with each other.</p>
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<h4 class="anchor anchorWithStickyNavbar_JmGV" id="logical-operators">Logical operators<a href="#logical-operators" class="hash-link" aria-label="Direct link to Logical operators" title="Direct link to Logical operators"></a></h4>
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<p>Logical operators allow combining simple context keys or when-clause expressions that include other operators</p>
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<table><thead><tr><th>Operator</th><th>Symbol</th><th>Example</th></tr></thead><tbody><tr><td>Not</td><td><code>!</code></td><td><code>!podmanIsInstalled</code> or <code>!(podmanIsInstalled && isWindows)</code></td></tr><tr><td>And</td><td><code>&&</code></td><td><code>podmanIsInstalled && isWindows</code></td></tr><tr><td>Or</td><td><code>||</code></td><td><code>isLinux || isWindows</code></td></tr></tbody></table>
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<h4 class="anchor anchorWithStickyNavbar_JmGV" id="equality-operators">Equality operators<a href="#equality-operators" class="hash-link" aria-label="Direct link to Equality operators" title="Direct link to Equality operators"></a></h4>
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<p>Equality operators allow checking for equality of a context key's value against a specified value.</p>
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<p><strong>Note:</strong> the right side is a value and not considered as a context key, so no value is searched in the context. If it contains whitespaces, it must be wrapped in single-quotes (for example <code>'my tool.exe'</code>)</p>
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<table><thead><tr><th>Operator</th><th>Symbol</th><th>Example</th></tr></thead><tbody><tr><td>Equality</td><td><code>==</code></td><td><code>onboardingContext:toolInstalled == oc.exe</code></td></tr><tr><td>Inequality</td><td><code>!=</code></td><td><code>onboardingContext:toolInstalled != oc.exe</code></td></tr></tbody></table>
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<h4 class="anchor anchorWithStickyNavbar_JmGV" id="comparison-operators">Comparison operators<a href="#comparison-operators" class="hash-link" aria-label="Direct link to Comparison operators" title="Direct link to Comparison operators"></a></h4>
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<p>Comparison operator allow comparing a context key's value against a number.</p>
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<p><strong>Note:</strong> the left and right side of the operator must be separated by whitespace - <code>bar < 2</code>, but not <code>bar<2</code></p>
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<table><thead><tr><th>Operator</th><th>Symbol</th><th>Example</th></tr></thead><tbody><tr><td>Greater than</td><td><code>></code>, <code>>=</code></td><td><code>onboardingContext:toolInstalled > 2</code></td></tr><tr><td>Less than</td><td><code><</code>, <code><=</code></td><td><code>onboardingContext:toolInstalled <= 3</code></td></tr></tbody></table>
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<h4 class="anchor anchorWithStickyNavbar_JmGV" id="in-and-not-in">In and not in<a href="#in-and-not-in" class="hash-link" aria-label="Direct link to In and not in" title="Direct link to In and not in"></a></h4>
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<p>The <code>in</code>/<code>not in</code> operators allow checking if a value exists/not exists within the other. The right should be a context key, which value is retrieved in the context. The left can be a value or a context key.</p>
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||
<table><thead><tr><th>Operator</th><th>Symbol</th><th>Example</th></tr></thead><tbody><tr><td>In</td><td><code>in</code></td><td><code>label in containerLabelKeys</code></td></tr><tr><td>Not</td><td><code>not in</code></td><td><code>label not in containerLabelKeys</code></td></tr></tbody></table>
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<h4 class="anchor anchorWithStickyNavbar_JmGV" id="match-operator">Match operator<a href="#match-operator" class="hash-link" aria-label="Direct link to Match operator" title="Direct link to Match operator"></a></h4>
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<p>The match operator allow treating the right side item as a regular expression literal to match against the left side.</p>
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<table><thead><tr><th>Operator</th><th>Symbol</th><th>Example</th></tr></thead><tbody><tr><td>Matches</td><td><code>=~</code></td><td><code>label =~ /podman$/</code></td></tr></tbody></table></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-tags-row row margin-bottom--sm"><div class="col"><b>Tags:</b><ul class="tags_Ow0B padding--none margin-left--sm"><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/docs/tags/podman-desktop">podman-desktop</a></li><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/docs/tags/extension">extension</a></li><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/docs/tags/writing">writing</a></li><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/docs/tags/when-clause">when clause</a></li></ul></div></div><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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