fix(docker): install fontconfig + ttf-dejavu to silence Sharp/libvips…#23
Merged
simonabler merged 1 commit intomasterfrom Mar 11, 2026
Merged
fix(docker): install fontconfig + ttf-dejavu to silence Sharp/libvips…#23simonabler merged 1 commit intomasterfrom
simonabler merged 1 commit intomasterfrom
Conversation
… warning node:24-alpine has no Fontconfig installation. When Sharp composites an SVG overlay that contains <text> elements, libvips internally calls into librsvg/Pango to render it. Pango uses Fontconfig to locate system fonts; without a Fontconfig config file the process prints: Fontconfig error: Cannot load default config file: No such file: (null) This is non-fatal (the SVG is still rendered with a fallback glyph set) but it floods the container log on every watermark/text request. Fix: install fontconfig and ttf-dejavu (a standard, complete free font family covering Latin, Greek, Cyrillic, etc.) in the runtime stage, then rebuild the font cache with fc-cache -f so Fontconfig finds the config file. ttf-dejavu is chosen because: - Available in Alpine apk with no extra repos - Covers the most common scripts users will embed in watermarks - Small (~1 MB compressed)
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
… warning
node:24-alpine has no Fontconfig installation. When Sharp composites an SVG overlay that contains elements, libvips internally calls into librsvg/Pango to render it. Pango uses Fontconfig to locate system fonts; without a Fontconfig config file the process prints:
Fontconfig error: Cannot load default config file: No such file: (null)
This is non-fatal (the SVG is still rendered with a fallback glyph set) but it floods the container log on every watermark/text request.
Fix: install fontconfig and ttf-dejavu (a standard, complete free font family covering Latin, Greek, Cyrillic, etc.) in the runtime stage, then rebuild the font cache with fc-cache -f so Fontconfig finds the config file.
ttf-dejavu is chosen because: