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imagetools: fix concurrent map write from containerd issue - #3510

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Nov 11, 2025
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imagetools: fix concurrent map write from containerd issue#3510
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tonistiigi:fix-mediatype-concurrency

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@tonistiigitonistiigi commented Nov 11, 2025•
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closes#3503

Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.

@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi added this to the v0.30.0 milestone Nov 11, 2025
@jsternberg
jsternberg merged commit 8e8054f into docker:masterNov 11, 2025
139 checks passed
This was referenced Nov 15, 2025
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Concurrent map write

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
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imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
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@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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@jsternbergjsternbergjsternberg approved these changes

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Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
Skip to content
imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Conversation
@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

edited

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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Reviewers

@jsternbergjsternbergjsternberg approved these changes

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@tonistiigitonistiigi

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Milestone

v0.30.0

Development

Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
Skip to content
imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Conversation
@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

edited

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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Reviewers

@jsternbergjsternbergjsternberg approved these changes

Assignees

@tonistiigitonistiigi

Labels

area/cli

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Milestone

v0.30.0

Development

Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
Skip to content
imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Conversation
@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

edited

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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Reviewers

@jsternbergjsternbergjsternberg approved these changes

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@tonistiigitonistiigi

Labels

area/cli

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Milestone

v0.30.0

Development

Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
Skip to content
imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Conversation
@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

edited

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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Reviewers

@jsternbergjsternbergjsternberg approved these changes

Assignees

@tonistiigitonistiigi

Labels

area/cli

Projects


None yet


Milestone

v0.30.0

Development

Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
imagetools: fix concurrent map write from containerd issue by tonistiigi · Pull Request #3510 · docker/buildx · GitHub
Skip to content
imagetools: fix concurrent map write from containerd issue - #3510
Merged
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Nov 11, 2025
Merged
imagetools: fix concurrent map write from containerd issue#3510
jsternberg merged 1 commit into
docker:masterfrom 
tonistiigi:fix-mediatype-concurrency
Conversation
@tonistiigi
@tonistiigitonistiigi
commented
Nov 11, 2025•

edited

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closes#3503
Workaround for containerd issue that can cause concurrent map write when WithMediaTypeKeyPrefix is called in parallel goroutines for context that originated from same base context.
@tonistiigi
imagetools: fix concurrent map write from containerd issue
e980432
Workaround for containerd issue that can cause concurrent map
write when WithMediaTypeKeyPrefix is called in parallel
goroutines for context that originated from same base context.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigitonistiigi
added this to the v0.30.0 milestone
Nov 11, 2025
@jsternberg
jsternberg
merged commit 8e8054f
into
docker:masterNov 11, 2025

139 checks passed


This was referenced Nov 15, 2025
 Merged


Closed

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Reviewers

@jsternbergjsternbergjsternberg approved these changes

Assignees

@tonistiigitonistiigi

Labels

area/cli

Projects


None yet


Milestone

v0.30.0

Development

Successfully merging this pull request may close these issues.

Concurrent map write


2 participants

@tonistiigi@jsternberg