version pipelining

.bazelrc

@@ -89,3 +89,6 @@ try-import %workspace%/.bazelrc.user
 
 build --action_env=AWS_ACCESS_KEY_ID --action_env=AWS_SECRET_ACCESS_KEY --action_env=PULUMI_ACCESS_TOKEN
 test --action_env=PULUMI_ACCESS_TOKEN
+
+# be careful with this!
+test --test_tag_filters=-do_not_run_on_main

.github/workflows/ci.yml

@@ -102,5 +102,5 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Set PR to merge automatically
-        run: gh pr merge --auto --merge --head main --base versioned
+        run: gh pr merge versioned --auto
 

bzl/versioning/BUILD

@@ -1,6 +1,6 @@
 exports_files(
     [
-        "version.tmpl.txt"
+        "bump.py"
     ],
     visibility = ["//visibility:public"],
 )

bzl/versioning/bump.py

@@ -0,0 +1,35 @@
+import argparse
+import os
+import subprocess
+import shutil
+
+parser = argparse.ArgumentParser(description="Performs the action of a version bump.")
+parser.add_argument('--to_bump_in', help="The version file to bump, as a root-relative path.", type=str)
+parser.add_argument('--to_bump_out', help="The version file to bump, as a root-relative path.", type=str)
+parser.add_argument('--lockfile_build_label', help="A label that points to the generated (new) version lockfile.", type=str)
+parser.add_argument('--lockfile_build_rootpath', help="The path from the repo root that the lockfile is generated into", type=str)
+parser.add_argument('--lockfile_out_rootpath', help="The location to place the newly minted version lockfile at.", type=str)
+
+# This happens directly on the real workspace -- also, needs to be
+# run from bazel to have this set.
+os.chdir(os.environ.get('BUILD_WORKSPACE_DIRECTORY'))
+
+args = parser.parse_args()
+
+number = 0
+
+with open(args.to_bump_in, mode='r', encoding='utf-8') as f:
+    number = int(f.read())
+
+
+with open(args.to_bump_out, mode='w', encoding='utf-8') as f:
+    f.write(str(number+1))
+
+# Once the version has been bumped, generate the new version bump file.
+subprocess.run(["bazelisk", "build", args.lockfile_build_label])
+
+# Copy the newly created lockfile across
+shutil.copyfile(
+    os.path.join("dist", "bin", args.lockfile_build_rootpath), 
+    args.lockfile_out_rootpath
+)

bzl/versioning/rules.bzl

@@ -1,3 +1,6 @@
+load("//bzl/hash:rules.bzl", "hashes")
+load("@build_bazel_rules_nodejs//:index.bzl", "generated_file_test")
+load("@rules_python//python:defs.bzl", "py_binary")
 
 def semver_version(name, **kwargs):
     _semver_version(
@@ -34,3 +37,49 @@ _semver_version = rule(
         "output": attr.output(mandatory = True)
     }
 )
+
+def _absolute_label(label):
+    if label.startswith('@') or label.startswith('/'):
+        return label
+    if label.startswith(':'):
+        return native.repository_name() + '//' + native.package_name() + label
+    return native.repository_name() + '//' + native.package_name() + ':' + label
+
+def bump_on_change_test(name, srcs = [], version_lock = None, version = None, run_on_main = False):
+    tags = []
+
+    if not run_on_main:
+        tags = [ 'do_not_run_on_main' ]
+
+    hashes_name = name + "_version_lock_validator"
+    hashes(
+        name = hashes_name,
+        srcs = srcs + [ version ],
+    )
+
+    generated_file_test(
+        name = name,
+        generated = hashes_name,
+        src = version_lock,
+        tags = tags + [ 'version_check' ]
+    )
+
+    py_binary(
+        name = name + ".bump",
+        srcs = [ "//bzl/versioning:bump.py" ],
+        main = "//bzl/versioning:bump.py",
+        data = [ version, hashes_name, version_lock ],
+        args = [
+            "--to_bump_in", "$(rootpath " + version + ")",
+            "--to_bump_out", "$(rootpath " + version + ")",
+            "--lockfile_build_label",  _absolute_label(hashes_name),
+            "--lockfile_build_rootpath", "$(rootpath " + hashes_name + ")",
+            "--lockfile_out_rootpath", "$(rootpath " + version_lock + ")"
+        ]
+    )
+
+
+
+
+
+

bzl/versioning/test/bump_on_change_test/BUILD

@@ -0,0 +1,9 @@
+load("//bzl/versioning:rules.bzl", "bump_on_change_test")
+
+bump_on_change_test(
+    name = "version",
+    srcs = [ "contents.txt" ],
+    version_lock = "version.lock",
+    version = "MAJOR",
+    run_on_main = True
+)

bzl/versioning/test/bump_on_change_test/MAJOR

@@ -0,0 +1 @@
+7

bzl/versioning/test/bump_on_change_test/contents.txt

@@ -0,0 +1 @@
+This is some content of our program

bzl/versioning/test/bump_on_change_test/version.lock

@@ -0,0 +1,2 @@
+040e04c69d4995ce0f768474f63263ccc87c3670b137516fcc1213a8b0f29406  bzl/versioning/test/bump_on_change_test/contents.txt
+7902699be42c8a8e46fbbb4501726517e86b22c56a189f7625a6da49081b2451  bzl/versioning/test/bump_on_change_test/MAJOR