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hongkongkiwi/valid_docker_tag_name

Created June 22, 2022 04:40
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One liner to format a git tag / branch name appropriately for a docker tag
Raw
valid_docker_tag_name
# 1. Replace any non valid characters with dash
# 2. Remove any .- from start of name
# 3. Replace duplicate dash with a single one
# 3. Replace duplicate underscore with a single one
# 4. Replace duplicate dot with a single one
# 5. Truncate string to 128 chars (or less)
sed -e 's/[^[:alnum:]\.\_\-]/-/g' \
-e 's|^[.-]\+||g' \
-e 's|-\+|-|g' \
-e 's|_\+|_|g' \
-e 's|\.\+|.|g' \
-e 's/^\(.\{128\}\).*/\1/'
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