package: spec file

Provide a spec file for `image-builder-cli`. The spec file is based on
`osbuild-composer`'s spec file except it is simplified as (some)
usecases would currently cloud the intent of the specfile. We can add
back RHEL conditionals when/if we start shipping and building for RHEL.

Some tools from `osbuild-composer` are also included; most notably the
one that generates bundled dependencies from vendored modules.

Signed-off-by: Simon de Vlieger <supakeen@redhat.com>

Makefile

@@ -0,0 +1,158 @@
+#
+# Maintenance Helpers
+#
+# This makefile contains targets used for development, as well as helpers to
+# aid automatization of maintenance. Unless a target is documented in
+# `make help`, it is not supported and is only meant to be used by developers
+# to aid their daily development work.
+#
+# All supported targets honor the `SRCDIR` variable to find the source-tree.
+# For most unsupported targets, you are expected to have the source-tree as
+# your working directory. To specify a different source-tree, simply override
+# the variable via `SRCDIR=<path>` on the commandline. By default, the working
+# directory is used for build output, but `BUILDDIR=<path>` allows overriding
+# it.
+#
+
+BUILDDIR ?= .
+SRCDIR ?= .
+
+RST2MAN ?= rst2man
+
+# see https://hub.docker.com/r/docker/golangci-lint/tags
+# v1.55 to get golang 1.21 (1.21.3)
+# v1.53 to get golang 1.20 (1.20.5)
+GOLANGCI_LINT_VERSION=v1.55
+GOLANGCI_LINT_CACHE_DIR=$(HOME)/.cache/golangci-lint/$(GOLANGCI_LINT_VERSION)
+GOLANGCI_COMPOSER_IMAGE=composer_golangci
+#
+# Automatic Variables
+#
+# This section contains a bunch of automatic variables used all over the place.
+# They mostly try to fetch information from the repository sources to avoid
+# hard-coding them in this makefile.
+#
+# Most of the variables here are pre-fetched so they will only ever be
+# evaluated once. This, however, means they are always executed regardless of
+# which target is run.
+#
+#     VERSION:
+#         This evaluates the `Version` field of the specfile. Therefore, it will
+#         be set to the latest version number of this repository without any
+#         prefix (just a plain number).
+#
+#     COMMIT:
+#         This evaluates to the latest git commit sha. This will not work if
+#         the source is not a git checkout. Hence, this variable is not
+#         pre-fetched but evaluated at time of use.
+#
+
+VERSION := $(shell (cd "$(SRCDIR)" && grep "^Version:" image-builder-cli.spec | sed 's/[^[:digit:]]*\([[:digit:]]\+\).*/\1/'))
+COMMIT = $(shell (cd "$(SRCDIR)" && git rev-parse HEAD))
+
+#
+# Generic Targets
+#
+# The following is a set of generic targets used across the makefile. The
+# following targets are defined:
+#
+#     help
+#         This target prints all supported targets. It is meant as
+#         documentation of targets we support and might use outside of this
+#         repository.
+#         This is also the default target.
+#
+#     $(BUILDDIR)/
+#     $(BUILDDIR)/%/
+#         This target simply creates the specified directory. It is limited to
+#         the build-dir as a safety measure. Note that this requires you to use
+#         a trailing slash after the directory to not mix it up with regular
+#         files. Lastly, you mostly want this as order-only dependency, since
+#         timestamps on directories do not affect their content.
+#
+
+.PHONY: help
+help:
+	@echo "make [TARGETS...]"
+	@echo
+	@echo "This is the maintenance makefile of image-builder-cli. The following"
+	@echo "targets are available:"
+	@echo
+	@echo "    help:               Print this usage information."
+	@echo "    rpm:                Build the RPM"
+	@echo "    srpm:               Build the source RPM"
+	@echo "    scratch:            Quick scratch build of RPM"
+	@echo "    clean:              Remove all built binaries"
+
+$(BUILDDIR)/:
+	mkdir -p "$@"
+
+$(BUILDDIR)/%/:
+	mkdir -p "$@"
+
+
+#
+# Maintenance Targets
+#
+# The following targets are meant for development and repository maintenance.
+# They are not supported nor is their use recommended in scripts.
+#
+
+.PHONY: build
+build: $(BUILDDIR)/bin/
+	go build -o $<image-builder ./cmd/image-builder/
+
+.PHONY: clean
+clean:
+	rm -rf $(BUILDDIR)/bin/
+	rm -rf $(CURDIR)/rpmbuild
+
+#
+# Building packages
+#
+# The following rules build image-builder-cli packages from the current HEAD
+# commit, based on the spec file in this directory.  The resulting packages
+# have the commit hash in their version, so that they don't get overwritten
+# when calling `make rpm` again after switching to another branch.
+#
+# All resulting files (spec files, source rpms, rpms) are written into
+# ./rpmbuild, using rpmbuild's usual directory structure.
+#
+
+RPM_SPECFILE=rpmbuild/SPECS/image-builder-cli.spec
+RPM_TARBALL=rpmbuild/SOURCES/image-builder-cli-$(COMMIT).tar.gz
+
+.PHONY: $(RPM_SPECFILE)
+$(RPM_SPECFILE):
+	mkdir -p $(CURDIR)/rpmbuild/SPECS
+	git show HEAD:image-builder-cli.spec > $(RPM_SPECFILE)
+	./tools/rpm_spec_add_provides_bundle.sh $(RPM_SPECFILE)
+
+$(RPM_TARBALL):
+	mkdir -p $(CURDIR)/rpmbuild/SOURCES
+	git archive --prefix=image-builder-cli-$(COMMIT)/ --format=tar.gz HEAD > $(RPM_TARBALL)
+
+.PHONY: srpm
+srpm: $(RPM_SPECFILE) $(RPM_TARBALL)
+	rpmbuild -bs \
+		--define "_topdir $(CURDIR)/rpmbuild" \
+		--define "commit $(COMMIT)" \
+		--with tests \
+		$(RPM_SPECFILE)
+
+.PHONY: rpm
+rpm: $(RPM_SPECFILE) $(RPM_TARBALL)
+	rpmbuild -bb \
+		--define "_topdir $(CURDIR)/rpmbuild" \
+		--define "commit $(COMMIT)" \
+		--with tests \
+		$(RPM_SPECFILE)
+
+.PHONY: scratch
+scratch: $(RPM_SPECFILE) $(RPM_TARBALL)
+	rpmbuild -bb \
+		--define "_topdir $(CURDIR)/rpmbuild" \
+		--define "commit $(COMMIT)" \
+		--without tests \
+		--nocheck \
+		$(RPM_SPECFILE)