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[docs] Update builder docs on last-modified times

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Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)
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Josh Hawn 2015-06-08 11:42:00 -07:00
parent 0e10507a1c
commit cd7e2a6b2b
2 changed files with 4 additions and 3 deletions
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3
docs/sources/articles/dockerfile_best-practices.md
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@ -103,7 +103,8 @@ a little more examination and explanation.
being put into the image are examined. Specifically, a checksum is done being put into the image are examined. Specifically, a checksum is done
of the file(s) and then that checksum is used during the cache lookup. of the file(s) and then that checksum is used during the cache lookup.
If anything has changed in the file(s), including its metadata, If anything has changed in the file(s), including its metadata,
then the cache is invalidated. then the cache is invalidated. The last-modified and last-accessed times of the
file(s) are not considered in these checksums.
* Aside from the `ADD` and `COPY` commands cache checking will not look at the * Aside from the `ADD` and `COPY` commands cache checking will not look at the
files in the container to determine a cache match. For example, when processing files in the container to determine a cache match. For example, when processing

4
docs/sources/reference/builder.md
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@ -519,8 +519,8 @@ All new files and directories are created with a UID and GID of 0.
In the case where `<src>` is a remote file URL, the destination will In the case where `<src>` is a remote file URL, the destination will
have permissions of 600. If the remote file being retrieved has an HTTP have permissions of 600. If the remote file being retrieved has an HTTP
`Last-Modified` header, the timestamp from that header will be used `Last-Modified` header, the timestamp from that header will be used
to set the `mtime` on the destination file. Then, like any other file to set the `mtime` on the destination file. However, like any other file
processed during an `ADD`, `mtime` will be included in the determination processed during an `ADD`, `mtime` will not be included in the determination
of whether or not the file has changed and the cache should be updated. of whether or not the file has changed and the cache should be updated.
> **Note**: > **Note**: