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buildkit: add from field to bind and cache mounts so images can be used as source

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Following commit adds buildkit like support for `from` field to `--mount=type=bind`
and `--mount=type=cache` so images and stage can be used as mount source.

Usage looks like
```dockerfile
RUN --mount=type=bind,source=.,from=<your-image>,target=/path ls /path
```
and
```dockerfile
RUN --mount=type=cache,from=<your-image>,target=/path ls /path
```

Signed-off-by: Aditya Rajan <arajan@redhat.com>
This commit is contained in:
Aditya Rajan
2021-10-18 11:21:51 +05:30
parent ee1d23967e
commit 719b660462
27 changed files with 896 additions and 302 deletions
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6
docs/buildah-run.1.md
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@@ -122,7 +122,7 @@ Current supported mount TYPES are bind, cache, secret and tmpfs. <sup>[[1]](#Foo
Common Options:
· src, source: mount source spec for bind and volume. Mandatory for bind.
· src, source: mount source spec for bind and volume. Mandatory for bind. If `from` is specified, `src` is the subpath in the `from` field.
· dst, destination, target: mount destination spec.
@@ -134,6 +134,8 @@ Current supported mount TYPES are bind, cache, secret and tmpfs. <sup>[[1]](#Foo
. bind-nonrecursive: do not setup a recursive bind mount. By default it is recursive.
· from: stage or image name for the root of the source. Defaults to the build context.
Options specific to tmpfs:
· tmpfs-size: Size of the tmpfs mount in bytes. Unlimited by default in Linux.
@@ -158,6 +160,8 @@ Current supported mount TYPES are bind, cache, secret and tmpfs. <sup>[[1]](#Foo
· gid: gid for cache directory.
· from: stage name for the root of the source. Defaults to host cache directory.
**--network**, **--net**=*mode*
Sets the configuration for the network namespace for the container.