*: rework update and generation scripts

This is necessary in order to have proper generation of variant and
version-based Dockerfiles from a single template.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

1 files changed, 74 insertions, 9 deletions

diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index bf54f977..e85a34ae 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -1,16 +1,81 @@
 #!/bin/bash
 set -e
 
+self="$(basename "$BASH_SOURCE")"
 cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
 
-url='git://github.com/nextcloud/docker'
+# Get the most recent commit which modified any of "$@".
+fileCommit() {
+	git log -1 --format='format:%H' HEAD -- "$@"
+}
 
-commit="$(git log -1 --format='format:%H' -- Dockerfile $(awk 'toupper($1) == "COPY" { for (i = 2; i < NF; i++) { print $i } }' Dockerfile))"
-fullVersion="$(grep -m1 'ENV NEXTCLOUD_VERSION ' ./Dockerfile | cut -d' ' -f3)"
+# Get the most recent commit which modified "$1/Dockerfile" or any file that
+# the Dockerfile copies into the rootfs (with COPY).
+dockerfileCommit() {
+	local dir="$1"; shift
+	(
+		cd "$dir";
+		fileCommit Dockerfile \
+			$(git show HEAD:./Dockerfile | awk '
+				toupper($1) == "COPY" {
+					for (i = 2; i < NF; i++)
+							print $i;
+				}
+			')
+	)
+}
 
-echo '# maintainer: docker@nextcloud.com'
-echo
-echo "$fullVersion: ${url}@${commit}"
-echo "${fullVersion%.*}: ${url}@${commit}"
-echo "${fullVersion%.*.*}: ${url}@${commit}"
-echo "latest: ${url}@${commit}"
+# Header.
+cat <<-EOH
+# This file is generated via https://github.com/nextcloud/docker/blob/$(fileCommit "$self")/$self
+
+Maintainers: Nextcloud <docker@nextcloud.com> (@nextcloud),
+             Pierre Ozoux <pierre@ozoux.net> (@pierreozoux)
+GitRepo: https://github.com/nextcloud/docker.git
+EOH
+
+# prints "$2$1$3$1...$N"
+join() {
+	local sep="$1"; shift
+	local out; printf -v out "${sep//%/%%}%s" "$@"
+	echo "${out#$sep}"
+}
+
+latest=$(curl -sSL 'https://nextcloud.com/changelog/' |tac|tac \
+	   | grep -o "\(Version\|Release\)\s\+[[:digit:]]\+\(.[[:digit:]]\+\)\+" \
+	   | awk '{ print $2 }' \
+	   | sort -uV \
+	   | tail -1)
+
+# Generate each of the tags.
+versions=( */ )
+versions=( "${versions[@]%/}" )
+for version in "${versions[@]}"; do
+	variants=( $version/*/ )
+	variants=( $(for variant in "${variants[@]%/}"; do
+		echo "$(basename "$variant")"
+	done) )
+	for variant in "${variants[@]}"; do
+		commit="$(dockerfileCommit "$version/$variant")"
+		fullversion="$(git show "$commit":"$version/$variant/Dockerfile" | awk '$1 == "ENV" && $2 == "NEXTCLOUD_VERSION" { print $3; exit }')"
+
+		versionAliases=( "$fullversion" "${fullversion%.*}" "${fullversion%.*.*}" )
+		if [ "$fullversion" = "$latest" ]; then
+			versionAliases+=( "latest" )
+		fi
+
+		variantAliases=( "${versionAliases[@]/%/-$variant}" )
+		variantAliases=( "${variantAliases[@]//latest-}" )
+
+		if [ "$variant" = "apache" ]; then
+			variantAliases+=( "${versionAliases[@]}" )
+		fi
+
+		cat <<-EOE
+
+			Tags: $(join ', ' "${variantAliases[@]}")
+			GitCommit: $commit
+			Directory: $version/$variant
+		EOE
+	done
+done