snap package enablement

.gitignore

@@ -30,3 +30,10 @@ missing
 py-compile
 stamp-h1
 test-driver
+=======
+parts
+stage
+prime
+*.snap
+snap/.snapcraft
+!snap/hooks/*

glue/usr/bin/avahi-help

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# This file is part of avahi.
+#
+# avahi is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# avahi is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with avahi; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+# parse config file for supported settings keys
+# shellcheck disable=SC1091 # SC1091 is irrelevant, ${SNAP} is defined withing snap context
+source "${SNAP}/usr/bin/config" &>/dev/null
+echo -e "avahi snap help"
+echo -e "avahi supports settings keys:"
+echo -e "values can be changed by calling\n$ snap set avahi avahi-daemon-conf.<key name>='<key value>'"
+echo -e "\te.g. $ snap set avahi avahi-daemon-conf.host-name=<host name>"
+
+echo -e "Curretly defined keys:"
+for index in ${!DEFINED_K[*]}; do
+   echo -e "\t${DEFINED_K[${index}]}=${DEFINED_V[${index}]}"
+done
+
+echo -e "Keys with no set value:"
+for index in ${!UNDEFINED_K[*]}; do
+    echo -e "\t${UNDEFINED_K[${index}]}, proposed value '${UNDEFINED_V[${index}]}'"
+done

glue/usr/bin/config

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# This file is part of avahi.
+#
+# avahi is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# avahi is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with avahi; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+# parse avahi config and store keys/values to the separate arrays
+# all commented out keys
+LUNDEFINED_K="$(grep -E '^#.*=' "${SNAP_COMMON}/etc/avahi/avahi-daemon.conf" | awk -F'[=]' '{print $1}' | tr '\n' ' ' | tr -d '#')"
+LUNDEFINED_V="$(grep -E '^#.*=' "${SNAP_COMMON}/etc/avahi/avahi-daemon.conf" | awk -F'[=]' '{print $2}' | tr '\n' ' ')"
+# shellcheck disable=SC2034 # SC2034 is irrelevant, UNDEFINED_K is used by calling script
+# shellcheck disable=SC2206 # SC2206 is irrelevant, we want the words to split
+UNDEFINED_K=(${LUNDEFINED_K})
+# shellcheck disable=SC2034 # SC2034 is irrelevant, UNDEFINED_V is used by calling script
+# shellcheck disable=SC2206 # SC2206 is irrelevant, we want the words to split
+UNDEFINED_V=(${LUNDEFINED_V})
+
+# all set keys
+LDEFINED_K="$(grep '^[a-zA-Z].*=' "${SNAP_COMMON}/etc/avahi/avahi-daemon.conf" | awk -F'[=]' '{print $1}' | tr '\n' ' ')"
+LDEFINED_V="$(grep '^[a-zA-Z].*=' "${SNAP_COMMON}/etc/avahi/avahi-daemon.conf" | awk -F'[=]' '{print $2}' | tr '\n' ' ')"
+# shellcheck disable=SC2034 # SC2034 is irrelevant, DEFINED_K is used by calling script
+# shellcheck disable=SC2206 # SC2206 is irrelevant, we want the words to split
+DEFINED_K=(${LDEFINED_K})
+# shellcheck disable=SC2034 # SC2034 is irrelevant, DEFINED_V is used by calling script
+# shellcheck disable=SC2206 # SC2206 is irrelevant, we want the words to split
+DEFINED_V=(${LDEFINED_V})

snap/hooks/configure

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# This file is part of avahi.
+#
+# avahi is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# avahi is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with avahi; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+hook_name=$(basename "${0}")
+logger "avahi.hook.${hook_name}: entering the hook" || true
+
+config_file="avahi-daemon.conf"
+# work on temp file, before commiting changes back, to reduce number of writes
+cp "${SNAP_COMMON}/etc/avahi/${config_file}" "/tmp/"
+
+process_line() {
+  # each line starts with key name and ends with the value
+  local key="${1}"
+  local value="${2}"
+  sed -i 's/.*'"${key}"'=.*/'"${key}"'='"${value}"'/g' /tmp/${config_file}
+}
+
+# read key value pairs from snap config line by line
+while read -r line
+do
+  # shellcheck disable=SC2086 # SC2086 does not apply, we are passing multiple arguments
+  process_line ${line}
+done < <( snapctl get -d avahi-daemon-conf | jq -r '.[] | to_entries[] | "\(.key) \(.value)"')
+
+# we are done, write back config file, only if it has changed
+if ! cmp "/tmp/${config_file}" "${SNAP_COMMON}/etc/avahi/${config_file}"; then
+  logger "avahi.${hook_name}: ${config_file} changed, updating it...."  || true
+  mv "/tmp/${config_file}" "${SNAP_COMMON}/etc/avahi/"
+  snapctl restart "${SNAP_INSTANCE_NAME}.daemon"
+fi
+
+# no need to restart avahi-daemon, it tracks the changes in the config file
+
+logger "avahi.hook.${hook_name}: hook finished successfully" || true

snap/hooks/install

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+# This file is part of avahi.
+#
+# avahi is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# avahi is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with avahi; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+hook_name=$(basename "${0}")
+logger "avahi.hook.${hook_name}: entering the hook" || true
+
+mkdir -p "${SNAP_COMMON}/etc" "${SNAP_COMMON}/usr/share"
+
+[ ! -d "${SNAP_COMMON}/etc/avahi/services" ] && cp -r "${SNAP}/etc/avahi" "${SNAP_COMMON}/etc"
+[ ! -d "${SNAP_COMMON}/usr/share/dbus-1" ] && cp -r "${SNAP}/usr/share/dbus-1" "${SNAP_COMMON}/usr/share"
+[ ! -e "${SNAP_COMMON}/usr/share/avahi/avahi-service.dtd" ] && cp -r "${SNAP}/usr/share/avahi" "${SNAP_COMMON}/usr/share"
+
+logger "avahi.hook.${hook_name}: hook finished successfully" || true

snap/hooks/post-refresh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+# This file is part of avahi.
+#
+# avahi is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# avahi is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with avahi; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA.
+
+hook_name=$(basename "${0}")
+logger "avahi.hook.${hook_name}: entering the hook" || true
+
+mkdir -p "${SNAP_COMMON}/etc" "${SNAP_COMMON}/usr/share"
+
+[ ! -d "${SNAP_COMMON}/etc/avahi/services" ] && cp -r "${SNAP}/etc/avahi" "${SNAP_COMMON}/etc"
+[ ! -d "${SNAP_COMMON}/usr/share/dbus-1" ] && cp -r "${SNAP}/usr/share/dbus-1" "${SNAP_COMMON}/usr/share"
+[ ! -e "${SNAP_COMMON}/usr/share/avahi/avahi-service.dtd" ] && cp -r "${SNAP}/usr/share/avahi" "${SNAP_COMMON}/usr/share"
+
+logger "avahi.hook.${hook_name}: hook finished successfully" || true