This checks for /sys/modules/loop before modprobing the loop module. My
understanding is that if this module is built into the kernel, that this
directory is still created. For a kernel without loop built in,
losetup.py will try to load the module using modprobe.
Thanks, cmdr2! Here's the text from his PR:
Fixes an issue on alpine-vanilla, where `/dev/loop` is a directory (containing `/dev/loop/0`, `/dev/loop/1` ..etc), and causes `./pmbootstrap install` to fail.
Ignoring the `/dev/loop` directory works because `/dev/` also contains files named `/dev/loop0`, `/dev/loop1` ..etc, which the new code will still pick up.
The `install` command passes after this fix on my alpine-vanilla.
Oliver Smith
clayton craft
Brian Otto
cmdr2