e2k: make serial hook more fault-proof

The early scheme consisted of boot.conf template with a separate hook filling it in; this was nice for serial console setup script which could just amend the kernel command line as needed _but_ this got changed towards the more generic scheme (breaking the hook in question, unfortunately).

e2k: make serial hook more fault-proof
bbfad01e · Michael Shigorin · d44be875 · bbfad01e
Commit bbfad01e authored May 21, 2018 by Michael Shigorin
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50-e2k-serial features.in/e2k/rootfs/image-scripts.d/50-e2k-serial +6 -1

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--- a/features.in/e2k/rootfs/image-scripts.d/50-e2k-serial
+++ b/features.in/e2k/rootfs/image-scripts.d/50-e2k-serial
 #!/bin/sh

 CFG="/boot/boot.conf"
+[ -s "$CFG" ] || {
+	echo "50-e2k-serial: $CFG missing, exiting" >&2
+	exit 0
+}

-[ -f "$CFG" ] || exit 1
 [ -n "$GLOBAL_TTY_DEV" -a -n "$GLOBAL_TTY_RATE" ] || exit 0

 # tty0 first
 sed -i "s/console=tty0 /console=$GLOBAL_TTY_DEV,$GLOBAL_TTY_RATE &/" "$CFG"
+
+### NB: there's no boot.conf yet!  could only be the sample one