I have the following script (what it does exactly is not important):
#!/bin/sh -e
### BEGIN INIT INFO
# Provides: watchdog_early
# Required-Start: udev
# Required-Stop:
# Default-Start: S
# Default-Stop:
# X-Interactive: true
# Short-Description: Start watchdog early.
### END INIT INFO
# Do stuff here...
I insert it into the S runlevel by invoking:
insserv watchdog_early
The aproriate link is created in /etc/rcS.d:
S04watchdog_early -> ../init.d/watchdog_early
and /etc/init.d/watchdog_early is executable (has mode 755).
Despite all this, it is NOT being run at boot. Why?
Post the full script.
Your shebang line, "#!/bin/sh -e" will exit on error. If the error condition is met before your debug output / lines run, you won't see them.
Alternately, remove the '-e' option and retry your script.