www-servers/caddy: add new USE flag - events_handlers_exec

Compiles caddy with events.handlers.exec module[1]

This module lets user 'exec'ute arbitrary command with args when some
events occur in Caddy.[2]

Example use:
Run a script which notifies (via mail/telegram etc) web admin when some
reverse_proxy's upstream becomes healthy/unhealthy or when something
goes wrong while obtaining/renewing TLS certificate automatically.

[1] https://caddyserver.com/docs/modules/events.handlers.exec
[2] https://caddyserver.com/docs/caddyfile/options#event-options

Signed-off-by: Rahil Bhimjiani <me@rahil.rocks>
Closes: https://github.com/gentoo/gentoo/pull/35232
Signed-off-by: Zac Medico <zmedico@gentoo.org>

1 files changed, 42 insertions, 7 deletions

diff --git a/www-servers/caddy/caddy-9999.ebuild b/www-servers/caddy/caddy-9999.ebuild
index 5657c0607730..daa4e4571bd8 100644
--- a/www-servers/caddy/caddy-9999.ebuild
+++ b/www-servers/caddy/caddy-9999.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -12,16 +12,23 @@ if [[ "${PV}" == 9999* ]]; then
 	inherit git-r3
 	EGIT_REPO_URI="https://github.com/caddyserver/caddy.git"
 else
-	SRC_URI="https://github.com/caddyserver/caddy/archive/v${PV}.tar.gz -> ${P}.tar.gz"
-	SRC_URI+=" https://github.com/rahilarious/gentoo-distfiles/releases/download/${P}/deps.tar.xz -> ${P}-deps.tar.xz"
-	SRC_URI+=" https://github.com/caddyserver/dist/archive/refs/tags/v${PV}.tar.gz -> ${P}-docs.tar.gz"
+	SRC_URI="
+		https://github.com/caddyserver/caddy/archive/v${PV}.tar.gz -> ${P}.tar.gz
+		https://github.com/rahilarious/gentoo-distfiles/releases/download/${P}/deps.tar.xz -> ${P}-deps.tar.xz
+		https://github.com/caddyserver/dist/archive/refs/tags/v${PV}.tar.gz -> ${P}-docs.tar.gz
+"
 	KEYWORDS="~amd64 ~arm64 ~loong ~riscv"
 fi
 
+# MAIN
 LICENSE="Apache-2.0"
+# deps
 LICENSE+=" BSD ECL-2.0 MIT CC0-1.0"
 SLOT="0"
+
+IUSE='events-handlers-exec'
 RESTRICT="test"
+
 RDEPEND="
 	acct-user/http
 	acct-group/http"
@@ -35,12 +42,26 @@ PATCHES=(
 	"${FILESDIR}"/remove-binary-altering-commands-2.7.5.patch
 )
 
+# takes a module as an only arg
+add_custom_module() {
+	local LINE_NO=$(grep -n 'plug in Caddy modules here' cmd/caddy/main.go | awk -F: '{print $1;}')
+	sed -i -e "${LINE_NO:?}a \        _ \"$1\"" cmd/caddy/main.go || die
+}
+
 src_unpack() {
 	if [[ "${PV}" == 9999* ]]; then
-		# unpack code
+		# clone main git repo
 		git-r3_src_unpack
 
-		# unpack docs and misc
+		# get extra modules
+		if use events-handlers-exec; then
+			pushd "${P}"
+			add_custom_module 'github.com/mholt/caddy-events-exec' || die
+			ego get github.com/mholt/caddy-events-exec
+			popd
+		fi
+
+		# clone dist repo (docs and misc)
 		EGIT_REPO_URI="https://github.com/caddyserver/dist.git"
 		EGIT_CHECKOUT_DIR="${WORKDIR}/dist-${PV}"
 		git-r3_src_unpack
@@ -51,9 +72,23 @@ src_unpack() {
 	fi
 }
 
-src_prepare(){
+src_prepare() {
 	default
 	sed -i -e "s|User=caddy|User=http|g;s|Group=caddy|Group=http|g;" ../dist-"${PV}"/init/*service || die
+
+	if use events-handlers-exec && [[ "${PV}" != 9999* ]]; then
+		add_custom_module 'github.com/mholt/caddy-events-exec' || die
+		cat <<-EOF >> go.sum || die
+			github.com/mholt/caddy-events-exec v0.0.0-20231121214933-055bfd2e8b82 h1:uRsPaFNQJRDrYcSsgnH0hFhCWFXfgB8QVH8yjX+u154=
+			github.com/mholt/caddy-events-exec v0.0.0-20231121214933-055bfd2e8b82/go.mod h1:Y9JjT8YLxpmk7PeUkvsWAhzzRdC6rXP7QjAHiwmvjD0=
+		EOF
+
+		cat <<-EOF >> go.mod || die
+			require (
+					github.com/mholt/caddy-events-exec v0.0.0-20231121214933-055bfd2e8b82 // indirect
+			)
+		EOF
+	fi
 }
 
 src_compile() {