install.sh: capture quoted environment variables (#4275)

Leverage posix builtins + grep (with regex matching) to emit quoted environment variables to K3S_FILE_ENV, e.g.: ```shell $ export CONTAINERD_TEST_1='one!1' K3S_TEST_2=two K3S_TEST_3='thr ee' TEST_4='!@#$%^&*()_+four!' $ sh -c export | while read x v; do echo $v; done | grep -E '^(K3S|CONTAINERD)_' CONTAINERD_TEST_1='one!1' K3S_TEST_2='two' K3S_TEST_3='thr ee' ``` Fixes #3395 Addresses rancher/k3os#708 Signed-off-by: Jacob Blain Christen <jacob@rancher.com>

install.sh: capture quoted environment variables (#4275)
72a1925a · Jacob Blain Christen · GitHub · 6058ab51 · 72a1925a
Unverified Commit 72a1925a authored Oct 22, 2021 by Jacob Blain Christen Committed by GitHub Oct 22, 2021
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install.sh install.sh +2 -3

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--- a/install.sh
+++ b/install.sh
@@ -727,9 +727,8 @@ create_env_file() {
    info "env: Creating environment file ${FILE_K3S_ENV}"
    $SUDO touch ${FILE_K3S_ENV}
    $SUDO chmod 0600 ${FILE_K3S_ENV}
-    env | grep '^K3S_' | $SUDO tee ${FILE_K3S_ENV} >/dev/null
-    env | grep '^CONTAINERD_' | $SUDO tee -a ${FILE_K3S_ENV} >/dev/null
-    env | grep -Ei '^(NO|HTTP|HTTPS)_PROXY' | $SUDO tee -a ${FILE_K3S_ENV} >/dev/null
+    sh -c export | while read x v; do echo $v; done | grep -E '^(K3S|CONTAINERD)_' | $SUDO tee ${FILE_K3S_ENV} >/dev/null
+    sh -c export | while read x v; do echo $v; done | grep -Ei '^(NO|HTTP|HTTPS)_PROXY' | $SUDO tee -a ${FILE_K3S_ENV} >/dev/null
 }

 # --- write systemd service file ---