Create Debian packages (#563)

* Adjust build-stamp to always reflect the most recent tag

* Create Debian packages

---------

Co-authored-by: Florian Weikert <fwe@google.com>

MODULE.bazel

@@ -8,6 +8,7 @@ module(
 bazel_dep(name = "gazelle", version = "0.38.0")
 bazel_dep(name = "platforms", version = "0.0.10")
 bazel_dep(name = "rules_go", version = "0.50.0")
+bazel_dep(name = "rules_pkg", version = "0.10.1")
 bazel_dep(name = "aspect_rules_js", version = "1.42.3")
 
 go_sdk = use_extension("@rules_go//go:extensions.bzl", "go_sdk")

deb/BUILD

@@ -0,0 +1,52 @@
+load("@rules_pkg//pkg:deb.bzl", "pkg_deb")
+load("@rules_pkg//pkg:tar.bzl", "pkg_tar")
+
+config_setting(
+    name = "stamp_detect",
+    values = {"stamp": "1"},
+)
+
+genrule(
+    name = "parse_version",
+    outs = ["version.txt"],
+    cmd_bash = select({
+        ":stamp_detect": "sed -ne 's#^STABLE_VERSION v##p' bazel-out/stable-status.txt > $@",
+        "//conditions:default": "echo 0.0.0 > $@",
+    }),
+    cmd_bat = "echo 0.0.0 >> $@",
+    stamp = True,
+)
+
+ARCHES = ["amd64", "arm64"]
+
+[
+    pkg_tar(
+        name = "bazelisk-{}_tar".format(arch),
+        out = "bazelisk-{}.tar".format(arch),
+        srcs = ["//:bazelisk-linux-{}".format(arch)],
+        remap_paths = {"bazelisk-linux_{}".format(arch): "bazelisk"},
+        package_dir = "/usr/bin",
+        stamp = -1,
+        symlinks = {"bazel": "bazelisk"},
+    )
+    for arch in ARCHES
+] 
+
+[
+    pkg_deb(
+        name = "bazelisk-{}_deb".format(arch),
+        architecture = arch,
+        conflicts = ["bazel"],
+        data = ":bazelisk-{}_tar".format(arch),
+        description_file = ":description.txt",
+        homepage = "https://github.com/bazelbuild/bazelisk",
+        license = "Apache-2.0",
+        maintainer = "The Bazel Authors <bazel-dev@googlegroups.com>",
+        out = "bazelisk-{}.deb".format(arch),
+        package = "bazelisk",
+        section = "contrib/devel",
+        version_file = ":version.txt",
+        visibility = ["//visibility:public"],
+    )
+    for arch in ARCHES
+]

deb/description.txt

@@ -0,0 +1,6 @@
+A user-friendly launcher for Bazel
+ Bazelisk is a wrapper for Bazel written in Go. It automatically picks a good
+ version of Bazel given your current working directory, downloads it from the
+ official server (if required) and then transparently passes through all
+ command-line arguments to the real Bazel binary. You can call it just like you
+ would call Bazel.

stamp.sh

@@ -1,10 +1,11 @@
 #!/bin/bash
 
-# Use the first tag that points to the current HEAD
-# if no tag is found, the latest git commit is used as a fallback
+# Use the first tag that points to the current HEAD. If no tag is found, the
+# summary given by `git describe` is used as a fallback (it contains the most
+# recent tag name, the number of commits since, and the short git hash).
 
 CURRENT_TAG=$(git tag -l --points-at HEAD | head -n1)
-CURRENT_COMMIT=$(git rev-parse HEAD)
+CURRENT_COMMIT=$(git describe --tags HEAD)
 
 echo "STABLE_VERSION ${CURRENT_TAG:-$CURRENT_COMMIT}"
 # rules_nodejs expects to read from volatile-status.txt