support for image generation

common.mk

@@ -11,21 +11,27 @@ build = $(common_dir)/build.sh
 test = $(common_dir)/test.sh
 tag = $(common_dir)/tag.sh
 clean = $(common_dir)/clean.sh
+generator = $(common_dir)/generate.sh
 
 ifeq ($(TARGET),rhel7)
 	SKIP_SQUASH ?= 0
 	OS := rhel7
 	DOCKERFILE ?= Dockerfile.rhel7
+	DG_CONF := rhel-7-x86_64.yaml
 else ifeq ($(TARGET),fedora)
 	OS := fedora
 	DOCKERFILE ?= Dockerfile.fedora
+	DG_CONF := fedora-27-x86_64.yaml
 else
 	OS := centos7
 	DOCKERFILE ?= Dockerfile
+	DG_CONF ?= centos-7-x86_64.yaml
 endif
 
 SKIP_SQUASH ?= 1
 DOCKER_BUILD_CONTEXT ?= .
+DISTGEN_BIN ?= /usr/bin/dg
+MANIFEST_FILE ?= manifest.sh
 
 script_env = \
 	SKIP_SQUASH=$(SKIP_SQUASH)                      \
@@ -35,6 +41,12 @@ script_env = \
 	DOCKER_BUILD_CONTEXT=$(DOCKER_BUILD_CONTEXT)    \
 	OPENSHIFT_NAMESPACES="$(OPENSHIFT_NAMESPACES)"
 
+generation_env = \
+	DG_CONF=$(DG_CONF) \
+	DG=$(DISTGEN_BIN) \
+	MANIFEST_FILE=$(MANIFEST_FILE)
+
+
 # TODO: switch to 'build: build-all' once parallel builds are relatively safe
 .PHONY: build build-serial build-all
 build: build-serial
@@ -79,3 +91,17 @@ clean:
 	mkdir -p $(@D)
 	go-md2man -in "$^" -out "$@"
 	chmod a+r "$@"
+
+.PHONY: generate
+generate:
+	@$(MAKE) auto_targets.mk
+	@$(MAKE) exec-gen-rules
+	rm auto_targets.mk
+
+auto_targets.mk: $(generator) $(MANIFEST_FILE)
+	VERSIONS="$(VERSIONS)" $(generation_env) $(generator)
+
+include auto_targets.mk
+
+.PHONY: exec-gen-rules
+exec-gen-rules: $(DISTGEN_TARGETS) $(COPY_TARGETS) $(SYMLINK_TARGETS)

generate.sh

@@ -0,0 +1,119 @@
+#!/bin/bash
+
+# This script is used to create image directories using distgen, cp or ln
+# It requires manifest.sh file to be present in image repository
+# The manifest file should contain set of rules in form:
+# <rules_type>="
+# src=<path to source>
+# dest=<path to destination>
+# mode=<destination file mode (optional)>;
+# ...;
+# "
+#
+# Supported type rules are now COPY_RULES, DISTGEN_RULES and SYMLINKS_RULES
+# for real example see https://github.com/sclorg/postgresql-container/blob/master/manifest.sh
+
+source manifest.sh
+
+test -f auto_targets.mk && rm auto_targets.mk
+
+DESTDIR="${DESTDIR:-$PWD}"
+
+clean_rule_variables(){
+    src=""
+    dest=""
+    mode=""
+    link_target=""
+    link_name=""
+}
+
+parse_rules() {
+    targets=""
+    OLD_IFS=$IFS
+    IFS=";"
+    for rule in $rules; do
+        if [ -z $(echo "$rule"| tr -d '[:space:]') ]; then
+            continue
+        fi
+        clean_rule_variables
+        eval $rule
+
+        case "$creator" in
+            copy)
+                [[ -z "$src" ]] && echo "src has to be specified in copy rule" && exit 1
+                [[ -z "$dest" ]] && echo "dest has to be specified in copy rule" && exit 1
+                core_subst=$core
+                ;;
+            distgen)
+                [[ -z "$src" ]] && echo "src has to be specified in distgen rule" && exit 1
+                [[ -z "$dest" ]] && echo "dest has to be specified in distgen rule" && exit 1
+                core_subst=$core
+                ;;
+            link)
+                [[ -z "$link_name" ]] && echo "link_name has to be specified in link rule" && exit 1
+                [[ -z "$link_target" ]] && echo "link_target has to be specified in link rule" && exit 1
+                dest="$link_name"
+                core_subst=$(echo $core | sed -e "s~__link_target__~"${link_target}"~g")
+                ;;
+        esac
+        t=$(echo ${DESTDIR}/${version}/${dest} | sed 's/ /\\ /g')
+        src=$(echo $src | sed 's/ /\\ /g' )
+        targets+="	$t \\
+"
+        cat >> auto_targets.mk << EOF
+$t: $src manifest.sh
+	@echo ${message} ; \\
+	mkdir -p "\$\$(dirname \$@)" || exit 1 ; \\
+	${core_subst}
+    ${mode:+"chmod ${mode} "\$@""}
+
+EOF
+    done
+    IFS=$OLD_IFS
+}
+
+for version in ${VERSIONS}; do
+    # copy targets
+    rules="$COPY_RULES"
+    core="cp \$< \$@ ; \\"
+    message="Copying \"\$@\""
+    creator="copy"
+    parse_rules
+    COPY_TARGETS+="$targets"
+
+
+    # distgen targets
+    rules="$DISTGEN_RULES"
+    core="${DG} --multispec specs/multispec.yml \\
+	--template \"\$<\" --distro \"$DG_CONF\" \\
+	--multispec-selector version=\"$version\" --output \"\$@\" ; \\"
+    message="Generating \"\$@\" using distgen"
+    creator="distgen"
+    parse_rules
+    DISTGEN_TARGETS+="$targets"
+
+
+    rules=$SYMLINK_RULES
+    core="ln -fs __link_target__ \$@ ; \\"
+    message="Creating symlink \"\$@\""
+    creator="link"
+    parse_rules
+    SYMLINK_TARGETS+="$targets"
+done
+
+    # adding COPY_TARGETS variable at the bottom of auto_targets.mk file
+    cat -v >> auto_targets.mk << EOF
+COPY_TARGETS = \\
+$COPY_TARGETS
+EOF
+
+    # adding DISTGEN_TARGETS variable at the bottom of auto_targets.mk file
+    cat -v >> auto_targets.mk << EOF
+DISTGEN_TARGETS = \\
+$DISTGEN_TARGETS
+EOF
+
+    cat -v >> auto_targets.mk << EOF
+SYMLINK_TARGETS = \\
+$SYMLINK_TARGETS
+EOF