diff --git a/README.md b/README.md
index ccc0ccf69..f111bb620 100644
--- a/README.md
+++ b/README.md
@@ -250,14 +250,19 @@ to use `container_push` with custom docker authentication credentials.
## Varying image names
-A common request from folks using `container_push` or `container_bundle` is to
+A common request from folks using
+`container_push`, `container_bundle`, or `container_image` is to
be able to vary the tag that is pushed or embedded. There are two options
at present for doing this.
### Stamping
-The first option is to use stamping. Stamping is enabled when a supported
-attribute contains a python format placeholder (e.g. `{BUILD_USER}`).
+The first option is to use stamping.
+Stamping is enabled when a bazel is run with `--stamp`.
+This enables replacements in stamp-aware attributes.
+A python format placeholder (e.g. `{BUILD_USER}`)
+is replaced by the corresponding key from the `bazel-out/stable-status.txt` or
+`bazel-out/volatile-status.txt` file.
```python
# A common pattern when users want to avoid trampling
@@ -269,31 +274,28 @@ container_push(
# Any of these components may have variables.
registry = "gcr.io",
repository = "my-project/my-image",
+ # This will be replaced with the current user when built with --stamp
tag = "{BUILD_USER}",
)
```
+Rules that are sensitive to stamping can also be forced to stamp or non-stamp mode
+irrespective of the `--stamp` flag to Bazel. Use the `build_context_data` rule
+to make a target that provides `BuildContextInfo`, and pass this to the `build_context_data` attribute.
+
The next natural question is: "Well what variables can I use?" This
option consumes the workspace-status variables Bazel defines in
-`stable-status.txt` and `volatile-status.txt`. These files will appear
-in the target's runfiles:
+`bazel-out/stable-status.txt` and `bazel-out/volatile-status.txt`.
-```shell
-$ bazel build //docker/testdata:push_stamp
-...
+> Note that changes to the stable-status file
+> cause a rebuild of the action, while volatile-status does not.
-$ cat bazel-bin/docker/testdata/push_stamp.runfiles/io_bazel_rules_docker/stable-status.txt
-BUILD_EMBED_LABEL
-BUILD_HOST bazel
-BUILD_USER mattmoor
+You can add more stamp variables via `--workspace_status_command`,
+see the [bazel docs](https://docs.bazel.build/versions/master/user-manual.html#workspace_status).
+A common example is to provide the current git SHA, with
+`--workspace_status_command="echo STABLE_GIT_SHA $(git rev-parse HEAD)"`
-$ cat bazel-bin/docker/testdata/push_stamp.runfiles/io_bazel_rules_docker/volatile-status.txt
-BUILD_TIMESTAMP 1498740967769
-
-```
-
-You can augment these variables via `--workspace_status_command`,
-including through the use of [`.bazelrc`](https://github.com/kubernetes/kubernetes/blob/81ce94ae1d8f5d04058eeb214e9af498afe78ff2/build/root/.bazelrc#L6).
+That flag is typically passed in the `.bazelrc` file, see for example [`.bazelrc` in kubernetes](https://github.com/kubernetes/kubernetes/blob/81ce94ae1d8f5d04058eeb214e9af498afe78ff2/build/root/.bazelrc#L6).
### Make variables
@@ -1546,20 +1548,6 @@ configuration. See [here](#container_push-custom-client-configuration) for detai
This field supports stamp variables.
-
- stamp |
-
- Bool; optional
- Deprecated: it is now automatically inferred.
- If true, enable use of workspace status variables
- (e.g. BUILD_USER, BUILD_EMBED_LABEL,
- and custom values set using --workspace_status_command)
- in tags.
- These fields are specified in the tag using Python format
- syntax, e.g.
- example.org/{BUILD_USER}/image:{BUILD_EMBED_LABEL}.
- |
-
@@ -1794,26 +1782,12 @@ A rule that aliases and saves N images into a single `docker save` tarball.
A collection of the images to save into the tarball.
The keys are the tags with which to alias the image specified by the
value. These tags may contain make variables ($FOO),
- and if stamp is set to true, may also contain workspace
+ and may also contain workspace
status variables ({BAR}).
The values may be the output of container_pull,
container_image, or a docker save tarball.
- Toolchains
- stamp |
-
- Bool; optional
- Deprecated: it is now automatically inferred.
- If true, enable use of workspace status variables
- (e.g. BUILD_USER, BUILD_EMBED_LABEL,
- and custom values set using --workspace_status_command)
- in tags.
- These fields are specified in the tag using Python format
- syntax, e.g.
- example.org/{BUILD_USER}/image:{BUILD_EMBED_LABEL}.
- |
-
diff --git a/container/bundle.bzl b/container/bundle.bzl
index 6f2d9d600..785f38a8d 100644
--- a/container/bundle.bzl
+++ b/container/bundle.bzl
@@ -14,7 +14,7 @@
"""Rule for bundling Container images into a tarball."""
load("@bazel_skylib//lib:dicts.bzl", "dicts")
-load("@io_bazel_rules_docker//container:providers.bzl", "BundleInfo")
+load("@io_bazel_rules_docker//container:providers.bzl", "BUILD_CONTEXT_ATTRS", "BuildContextInfo", "BundleInfo")
load(
"//container:layer_tools.bzl",
_assemble_image = "assemble",
@@ -38,18 +38,11 @@ def _container_bundle_impl(ctx):
images = {}
runfiles = []
- if ctx.attr.stamp:
- print("Attr 'stamp' is deprecated; it is now automatically inferred. Please remove it from %s" % ctx.label)
- stamp = False
+ stamp = ctx.attr.build_context_data[BuildContextInfo].stamp
for unresolved_tag in ctx.attr.images:
# Allow users to put make variables into the tag name.
tag = ctx.expand_make_variables("images", unresolved_tag, {})
- # If any tag contains python format syntax (which is how users
- # configure stamping), we enable stamping.
- if "{" in tag:
- stamp = True
-
target = ctx.attr.images[unresolved_tag]
layer = _get_layers(ctx, ctx.label.name, image_target_dict[target])
@@ -96,15 +89,11 @@ def _container_bundle_impl(ctx):
]
container_bundle_ = rule(
- attrs = dicts.add({
+ attrs = dicts.add(BUILD_CONTEXT_ATTRS, {
"image_target_strings": attr.string_list(),
# Implicit dependencies.
"image_targets": attr.label_list(allow_files = True),
"images": attr.string_dict(),
- "stamp": attr.bool(
- default = False,
- mandatory = False,
- ),
"tar_output": attr.output(),
}, _layer_tools),
executable = True,
diff --git a/container/image.bzl b/container/image.bzl
index b40c07620..dca2297af 100644
--- a/container/image.bzl
+++ b/container/image.bzl
@@ -26,6 +26,8 @@ load(
)
load(
"@io_bazel_rules_docker//container:providers.bzl",
+ "BUILD_CONTEXT_ATTRS",
+ "BuildContextInfo",
"ImageInfo",
"LayerInfo",
)
@@ -105,14 +107,7 @@ def _add_create_image_config_args(
args.add_all(ctx.attr.ports, before_each = "-ports")
args.add_all(ctx.attr.volumes, before_each = "-volumes")
- stamp = None
-
- # If base image is having enabled stamping then it is propagated
- # to child images.
- if ctx.attr.stamp == True:
- stamp = ctx.attr.stamp
- elif ctx.attr.base and ImageInfo in ctx.attr.base:
- stamp = ctx.attr.base[ImageInfo].stamp
+ stamp = ctx.attr.build_context_data[BuildContextInfo].stamp
if creation_time:
args.add("-creationTime", creation_time)
@@ -540,31 +535,11 @@ def _impl(
([container_parts["legacy"]] if container_parts["legacy"] else []),
)
- # Stamp attribute needs to be propagated between definitions to enhance actions
- # with ability to determine properly whether root image has activated stamping.
- #
- # This covers the following example case:
- # container_image(
- # name = “base_image”,
- # base = “@base//image”,
- # stamp = True,
- # )
- #
- # lang_image(
- # base = “:base_image”,
- # )
- stamp = None
- if ctx.attr.stamp:
- stamp = ctx.attr.stamp
- elif ctx.attr.base and ImageInfo in ctx.attr.base:
- stamp = ctx.attr.base[ImageInfo].stamp
-
return [
ImageInfo(
container_parts = container_parts,
legacy_run_behavior = ctx.attr.legacy_run_behavior,
docker_run_flags = docker_run_flags,
- stamp = stamp,
),
DefaultInfo(
executable = build_executable,
@@ -577,7 +552,7 @@ def _impl(
),
]
-_attrs = dicts.add(_layer.attrs, {
+_attrs = dicts.add(BUILD_CONTEXT_ATTRS, _layer.attrs, {
"architecture": attr.string(
doc = "The desired CPU architecture to be used as label in the container image.",
default = "amd64",
@@ -745,16 +720,6 @@ _attrs = dicts.add(_layer.attrs, {
Setting this attribute to `gcr.io/dummy` would set the default tag to
`gcr.io/dummy/package_name:target`.""",
),
- "stamp": attr.bool(
- default = False,
- doc = """If true, enable use of workspace status variables
- (e.g. `BUILD_USER`, `BUILD_EMBED_LABEL`,
- and custom values set using `--workspace_status_command`)
- in tags.
-
- These fields are specified in attributes using Python format
- syntax, e.g. `foo{BUILD_USER}bar`.""",
- ),
"user": attr.string(
doc = """The user that the image should run as.
diff --git a/container/providers.bzl b/container/providers.bzl
index c67dbedad..6873c701b 100644
--- a/container/providers.bzl
+++ b/container/providers.bzl
@@ -27,7 +27,6 @@ ImageInfo = provider(fields = [
"container_parts",
"legacy_run_behavior",
"docker_run_flags",
- "stamp",
])
# A provider containing information exposed by container_import rules
@@ -54,7 +53,6 @@ PushInfo = provider(fields = [
"registry",
"repository",
"tag",
- "stamp",
"stamp_inputs",
"digest",
])
@@ -73,3 +71,25 @@ FilterAspectInfo = provider(
"depset": "a depset of struct(target=, target_deps=)",
},
)
+
+#Modelled after _GoContextData in rules_go/go/private/context.bzl
+BuildContextInfo = provider(
+ doc = "Provides data about the build context, like config_setting's",
+ fields = {
+ "stamp": "If stamping is enabled",
+ },
+)
+
+BUILD_CONTEXT_ATTRS = {
+ "build_context_data": attr.label(
+ default = "@io_bazel_rules_docker//docker:build_context_data",
+ providers = [BuildContextInfo],
+ doc = """Provides info about the build context, such as stamping.
+
+By default it reads from the bazel command line, such as the `--stamp` argument.
+Use this to override values for this target, such as enabling or disabling stamping.
+You can use the `build_context_data` rule from `@io_bazel_rules_docker//docker:context.bzl`
+to create a BuildContextInfo and override the --stamp config setting.
+""",
+ ),
+}
diff --git a/container/push.bzl b/container/push.bzl
index 032d1232d..62eb00419 100644
--- a/container/push.bzl
+++ b/container/push.bzl
@@ -17,7 +17,7 @@ Bazel rule for publishing images.
"""
load("@bazel_skylib//lib:dicts.bzl", "dicts")
-load("@io_bazel_rules_docker//container:providers.bzl", "PushInfo")
+load("@io_bazel_rules_docker//container:providers.bzl", "BUILD_CONTEXT_ATTRS", "BuildContextInfo", "PushInfo")
load(
"//container:layer_tools.bzl",
_gen_img_args = "generate_args_for_image",
@@ -61,11 +61,7 @@ def _impl(ctx):
tag = "$(cat {})".format(_get_runfile_path(ctx, ctx.file.tag_file))
pusher_input.append(ctx.file.tag_file)
- # If any stampable attr contains python format syntax (which is how users
- # configure stamping), we enable stamping.
- if ctx.attr.stamp:
- print("Attr 'stamp' is deprecated; it is now automatically inferred. Please remove it from %s" % ctx.label)
- stamp = "{" in tag or "{" in registry or "{" in repository
+ stamp = ctx.attr.build_context_data[BuildContextInfo].stamp
stamp_inputs = [ctx.info_file, ctx.version_file] if stamp else []
for f in stamp_inputs:
pusher_args += ["-stamp-info-file", "%s" % _get_runfile_path(ctx, f)]
@@ -139,14 +135,13 @@ def _impl(ctx):
registry = registry,
repository = repository,
tag = tag,
- stamp = stamp,
stamp_inputs = stamp_inputs,
digest = ctx.outputs.digest,
),
]
_container_push = rule(
- attrs = dicts.add({
+ attrs = dicts.add(BUILD_CONTEXT_ATTRS, {
"extension": attr.string(
doc = "(optional) The file extension for the push script.",
),
@@ -179,10 +174,6 @@ _container_push = rule(
default = False,
doc = "Only push images if the digest has changed, default to False",
),
- "stamp": attr.bool(
- default = False,
- mandatory = False,
- ),
"tag": attr.string(
default = "latest",
doc = "(optional) The tag of the image, default to 'latest'.",
diff --git a/docker/BUILD b/docker/BUILD
index a7f15b237..c8d9abec8 100644
--- a/docker/BUILD
+++ b/docker/BUILD
@@ -13,6 +13,7 @@
# limitations under the License.
load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
+load(":context.bzl", "build_context_data")
package(default_visibility = ["//visibility:public"])
@@ -26,3 +27,19 @@ bzl_library(
"@io_bazel_rules_docker//toolchains/docker",
],
)
+
+# Detect if the build is running under --stamp
+config_setting(
+ name = "stamp",
+ values = {"stamp": "true"},
+)
+
+# Modelled after go_context_data from rules_go
+# passes config values to starlark via a provider
+build_context_data(
+ name = "build_context_data",
+ stamp = select({
+ "@io_bazel_rules_docker//docker:stamp": True,
+ "//conditions:default": False,
+ }),
+)
diff --git a/docker/context.bzl b/docker/context.bzl
new file mode 100644
index 000000000..d6b5d239e
--- /dev/null
+++ b/docker/context.bzl
@@ -0,0 +1,19 @@
+"build_context_data rule"
+
+load("@io_bazel_rules_docker//container:providers.bzl", "BuildContextInfo")
+
+_DOC = """build_context_data gathers information about the build configuration.
+It is a common dependency of all targets that are sensitive to configuration."""
+
+def _impl(ctx):
+ return [BuildContextInfo(stamp = ctx.attr.stamp)]
+
+# Modelled after go_context_data in rules_go
+# Works around github.com/bazelbuild/bazel/issues/1054
+build_context_data = rule(
+ implementation = _impl,
+ attrs = {
+ "stamp": attr.bool(mandatory = True),
+ },
+ doc = _DOC,
+)
diff --git a/testdata/BUILD b/testdata/BUILD
index 091cd5a33..0a29c03f4 100644
--- a/testdata/BUILD
+++ b/testdata/BUILD
@@ -39,6 +39,7 @@ load(
container_image_with_tag = "container_image",
)
load("//d:image.bzl", "d_image")
+load("//docker:context.bzl", "build_context_data")
load("//docker:docker.bzl", "docker_push")
load("//go:image.bzl", "go_image")
load("//groovy:image.bzl", "groovy_image")
@@ -54,7 +55,6 @@ load("//python:image.bzl", "py_image", "py_layer")
load("//python3:image.bzl", "py3_image")
load("//scala:image.bzl", "scala_image")
load("//testdata:utils.bzl", "generate_deb", "rule_with_symlinks")
-load(":stamp_info.bzl", "stamp_info")
package(default_visibility = ["//visibility:public"])
@@ -334,8 +334,8 @@ container_image(
container_image(
name = "with_stamped_creation_time",
base = ":base_with_volume",
+ build_context_data = ":always_stamp",
creation_time = "{BUILD_TIMESTAMP}",
- stamp = True,
)
container_image(
@@ -346,7 +346,7 @@ container_image(
container_image(
name = "with_default_stamped_creation_time",
base = ":base_with_volume",
- stamp = True,
+ build_context_data = ":always_stamp",
)
container_image(
@@ -405,10 +405,10 @@ container_image(
container_image(
name = "with_stamp_label",
base = ":base_with_volume",
+ build_context_data = ":always_stamp",
labels = {
"BUILDER": "{BUILD_USER}",
},
- stamp = True,
)
[genrule(
@@ -992,8 +992,10 @@ generate_deb(
metadata_compression_type = "xz",
)
-# Make the Bazel stamp file available in tests.
-stamp_info(name = "stamp_info_file")
+build_context_data(
+ name = "always_stamp",
+ stamp = True,
+)
# Auto-generated by Go linter.
go_binary(
@@ -1096,12 +1098,6 @@ container_push(
tags = ["manual"],
)
-bzl_library(
- name = "stamp_info_bzl",
- srcs = ["stamp_info.bzl"],
- visibility = ["//visibility:private"],
-)
-
bzl_library(
name = "utils_bzl",
srcs = ["utils.bzl"],