handle realpath in makerootfs.sh sanely

[deitch]

We use realpath in makerootfs.sh to find the absolute path to various elements. Unfortunately, that has two shortcomings:

1. realpath is not available on all systems, mainly some Mac
2. even where realpath is available, we run it against a filename that may not yet exist. Some systems will resolve it, but others will error out.

This updates makerootfs.sh to handle those cases sanely. Instead of realpath the target file, we realpath the parent directory.

If realpath does not exist, we fall back to cd $parent && pwd -P, which gives the same result.

[andrewd-zededa]

I removed my symlink workaround and tried the build, works great. Thanks

[eriknordmark]

If realpath does not exist, we fall back to cd $parent && pwd -P, which gives the same result.

Why can't we always do this if it gives the same result?

[deitch]

Why can't we always do this if it gives the same result?

No idea. I guess we could. I will try it and update.

[deitch]

OK, updated

[andrewd-zededa]

Latest changes are still a working build on my machine.

[eriknordmark]

LGTM

[zedi-pramodh]

If realpath is removed then we do not need the commit. You might as well revert that commit.

commit bbce625
Author: Pramodh Pallapothu pramodh@zededa.com
Date: Tue Jun 6 12:40:58 2023 -0700

Add coreutils package as prereq for MAC

Signed-off-by: Pramodh Pallapothu <pramodh@zededa.com>

[deitch]

That commit isn't in here.

[zedi-pramodh]

I know I did that. But since you are removing realpath you might as remove the prerequisites of coreutils for the MAC.

[deitch]

No problem @zedi-pramodh ; done.

[eriknordmark]

Run eden