Add rootfs.exe tool to merge tar image layers
#2424
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Add tool to merge layer tarball files, which is used for creating WCOW uVM images with additional features added, without first needing to create a dedicated container image. This basically amounts to the append and flatten container image operations from the [crane](github.com/google/go-containerregistry/cmd/crane) tool, with some specific changes: - use `"path"` and not `"path/filepath"` for path manipulation, which avoids paths with `\` separators; - append a trailing `/` to directory paths (since different `tar` implementations may append them); and - overwrite the owner UID and GID to zero, to avoid any user issues. The tool avoids needing to unpack tar files within the same directory (as is done for LCOW) to combine the deltas with tar images. Based on 2024 Hackathon to replace current LCOW uVM rootfs creation, before the switch to Azure Linux. Signed-off-by: Hamza El-Saawy <[email protected]>
kiashok
reviewed
May 9, 2025
internal/tools/rootfs/merge.go
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kiashok
approved these changes
May 9, 2025
Signed-off-by: Hamza El-Saawy <[email protected]>
ambarve
approved these changes
May 13, 2025
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Add tool to merge layer tarball files, which is used for creating WCOW uVM images with additional features added, without first needing to create a dedicated container image.
This basically amounts to the append and flatten container image operations from the
crane tool, with some specific changes:
"path"and not"path/filepath"for path manipulation, which avoids paths with\separators;/to directory paths (since differenttarimplementations may append them); andThe tool avoids needing to unpack tar files within the same directory (as is done for LCOW) to combine the deltas with tar images.