diff options
| -rw-r--r-- | tools/vm/README.md | 6 | ||||
| -rw-r--r-- | tools/vm/defs.bzl | 11 |
2 files changed, 12 insertions, 5 deletions
diff --git a/tools/vm/README.md b/tools/vm/README.md index 898c95fca..1e9859e66 100644 --- a/tools/vm/README.md +++ b/tools/vm/README.md @@ -25,6 +25,12 @@ vm_image( These images can be built manually by executing the target. The output on `stdout` will be the image id (in the current project). +For example: + +``` +$ bazel build :ubuntu +``` + Images are always named per the hash of all the hermetic input scripts. This allows images to be memoized quickly and easily. diff --git a/tools/vm/defs.bzl b/tools/vm/defs.bzl index 0f67cfa92..9af5ad3b4 100644 --- a/tools/vm/defs.bzl +++ b/tools/vm/defs.bzl @@ -60,11 +60,12 @@ def _vm_image_impl(ctx): # Run the builder to generate our output. echo = ctx.actions.declare_file(ctx.label.name) resolved_inputs, argv, runfiles_manifests = ctx.resolve_command( - command = "echo -ne \"#!/bin/bash\\nset -e\\nimage=$(%s)\\necho ${image}\\n\" > %s && chmod 0755 %s" % ( - ctx.files.builder[0].path, - echo.path, - echo.path, - ), + command = "\n".join([ + "set -e", + "image=$(%s)" % ctx.files.builder[0].path, + "echo -ne \"#!/bin/bash\\necho ${image}\\n\" > %s" % echo.path, + "chmod 0755 %s" % echo.path, + ]), tools = [ctx.attr.builder], ) ctx.actions.run_shell( |