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In a downstream test job, I've seen an e2e test failing to create a directory for Pod logs when running an e2e test. Shorten them to 255 characters. For example, consider this test: "[sig-storage] CSI Mock selinux on mount metrics and SELinuxWarningController SELinuxMount metrics [LinuxOnly] [Feature:SELinux] [Serial] error is not bumped on two Pods with a different policy RWX volume (MountOption + MountOption) [FeatureGate:SELinuxMountReadWriteOncePod] [Beta] [FeatureGate:SELinuxChangePolicy] [Beta] [FeatureGate:SELinuxMount] [Beta] [Feature:OffByDefault] [sig-storage, Feature:SELinux, Serial, FeatureGate:SELinuxMountReadWriteOncePod, Beta, FeatureGate:SELinuxChangePolicy, FeatureGate:SELinuxMount, Feature:OffByDefault, BetaOffByDefault]" During execution, the test will create a directory `error_is_not_bumped_on_two_Pods_with_Recursive_policy_and_a_different_context_on_RWX_volume_FeatureGate_SELinuxMountReadWriteOncePod_Beta_FeatureGate_SELinuxChangePolicy_Beta_FeatureGate_SELinuxMount_Beta_Feature_OffByDefault_`, which has 226 characters and it's close to the limit (256).
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
/*
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Copyright 2025 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"fmt"
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"hash/crc32"
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)
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// The max length for ntfs, ext4, xfs and btrfs.
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const maxFileNameLength = 255
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// Shorten a file name to size allowed by the most common filesystems.
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// If the filename is too long, cut it + add a short hash (crc32) that makes it unique.
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// Note that the input should be a single file / directory name, not a path
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// composed of several directories.
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func ShortenFileName(filename string) string {
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if len(filename) <= maxFileNameLength {
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return filename
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}
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hash := crc32.ChecksumIEEE([]byte(filename))
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hashString := fmt.Sprintf("%x", hash)
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hashLen := len(hashString)
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return fmt.Sprintf("%s-%s", filename[:maxFileNameLength-1-hashLen], hashString)
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}
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