doc.go: Perfect description #177
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wking
reviewed
Aug 30, 2017
image/doc.go
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| // limitations under the License. | ||
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| // Package image defines methods for validating, and unpacking OCI images. | ||
| // Package image defines methods for validating, unpacking and creating OCI images. |
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What functionality does it provide for creating images? The only creation functionality I can find is for bundle creation (e.g. CreateRuntimeBundle), and that's part of unpacking an image.
I'd expect image creation to include layer generation (in flight with #8), CAS pushing (in flight with #5), and/or index generation (something like it in #5, but I'm not aware of any image-tools work on this front since opencontainers/image-spec#533).
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What functionality does it provide for creating images?
createBundle
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I think the new changes can express my thoughts.
coolljt0725
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Oct 19, 2017
Implementing the logic that is in-flight with [1], but using recursive removal [2]. GNU tar has a --recursive-unlink option that's not enabled by default, with the motivation being something like "folks would be mad if we blew away a full tree and replaced it with a broken symlink" [3]. That makes sense for working filesystems, but we're building the rootfs from scratch here so losing information is not a concern. This commit always uses recursive removal to get that old thing off the filesystem (whatever it takes ;). The exception to the removal is if both the tar entry and existing path occupant are directories. In this case we want to use GNU tar's default --overwrite-dir behavior, but unpackLayer's metadata handling is currently very weak so I've left it at "don't delete the old directory". The reworked directory case also fixes a minor bug from 44210d0 (cmd/oci-image-tool: fix unpacking..., 2016-07-22, #177) where the: if fi, err := os.Lstat(path); !(err == nil && fi.IsDir()) { block would not error out if the Lstat failed for a reason besides the acceptable IsNotExist. Instead, it would attempt to call MkdirAll, which would probably fail for the same reason that Lstat failed (e.g. ENOTDIR). But it's better to handle the Lstat errors directly. [1]: opencontainers/image-spec#317 [2]: https://github.com/opencontainers/image-spec/pull/317/files#r79214718 [3]: https://www.gnu.org/software/tar/manual/html_node/Dealing-with-Old-Files.html Signed-off-by: W. Trevor King <[email protected]>
Mashimiao
reviewed
Nov 9, 2017
image/doc.go
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| // limitations under the License. | ||
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| // Package image defines methods for validating, and unpacking OCI images. | ||
| // Package image defines methods for validating, unpacking OCI images and creating runtime bundle. |
Signed-off-by: zhouhao <[email protected]>
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LGTM |
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LGTM |
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Signed-off-by: zhouhao [email protected]