setup-apt-repo: Use /etc/os-release instead of lsb_release.

But still install lsb-release for now since Puppet acts funny without
it.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

scripts/lib/setup-apt-repo

@@ -52,6 +52,8 @@ if ! [ -d "$LIST_PATH" ]; then
     exit 1
 fi
 
+release="$(. /etc/os-release && printf '%s' "$VERSION_CODENAME")"
+
 DEPENDENCIES_HASH=$(sha1sum "$LIST_PATH/"*.asc "$0")
 DEPENDENCIES_HASH_FILE="/var/lib/zulip/setup-repositories-state-$LIST"
 # Ensure that DEPENDENCIES_HASH_FILE exists before hashing it.
@@ -78,7 +80,6 @@ if ! apt-get -dy install "${pre_setup_deps[@]}"; then
 fi
 apt-get -y install "${pre_setup_deps[@]}"
 
-release=$(lsb_release -sc)
 if [ -f "$LIST_PATH/$release.list" ]; then
     apt-key add "$LIST_PATH/"*.asc
     cp "$LIST_PATH/$release.list" "$SOURCES_FILE"

scripts/setup/apt-repos/zulip/custom.sh

@@ -19,8 +19,11 @@ if [[ ! -e /usr/share/doc/groonga-apt-source/copyright ]]; then
                 | cut --delimiter=: --fields=10 \
                 | head --lines=1
         )
-        release=$(lsb_release -sc)
-        distribution=$(lsb_release -si | tr '[:upper:]' '[:lower:]')
+        os_info="$(. /etc/os-release && printf '%s\n' "$ID" "$VERSION_CODENAME")"
+        {
+            read -r distribution
+            read -r release
+        } <<<"$os_info"
         groonga_apt_source_deb="groonga-apt-source-latest-$release.deb"
         groonga_apt_source_deb_sign="$groonga_apt_source_deb.asc.$pgroonga_apt_sign_key_fingerprint"
         curl -fLO "https://packages.groonga.org/$distribution/$groonga_apt_source_deb"