Allow patches, scripts and overrides in /etc/dkms

[scaronni]

Resolves #562.

Overrides in /etc/dkms:

• Patches declared with the PATCH[#] directives, can now:
  • Reside in /etc/dkms/<module>/patches/
  • Be overridden by a patch with the same name in /etc/dkms/<module>/patches/
  • As before, the directory structure is preserved, as the whole patches directory is copied.
• Scripts declared with POST_ADD, PRE_BUILD, POST_BUILD, PRE_INSTALL, POST_INSTALL and POST_REMOVE can now:
  • Reside in /etc/dkms/<module>/
  • Be overridden by a script with the same name in /etc/dkms/<module>/

Examples

Overriding a patch

Original:

$ ls -l /usr/src/gasket-1.0/my.patch
-rw-r--r--. 1 root root 2909 Mar  5 01:00 /usr/src/gasket-1.0/my.patch
$ cat /usr/src/gasket-1.0/dkms.conf
PATCH[0]="my.patch"

Override:

$ ls -l /etc/dkms/gasket/patches/my.patch
-rw-r--r--. 1 root root 2828 Mar 16 01:00 /etc/dkms/gasket/patches/my.patch

New local patch

Adding a new local patch that survives across DKMS module upgrades:

$ ls -l /etc/dkms/cxr88/patches/local.patch
-rw-r--r--. 1 root root 2834 Mar 19 01:00 /etc/dkms/cxr88/patches/local.patch
$ cat /etc/dkms/cxr88.conf
PATCH[0]="local.patch"

New post script

Adding a new post script that survives across DKMS module upgrades:

$ ls -l /etc/dkms/nvidia/scripts/reload-nvidia-peermem.sh
-rw-r--r--. 1 root root 2834 Mar 19 01:00 /etc/dkms/nvidia/scripts/reload-nvidia-peermem.sh
$ cat /etc/dkms/nvidia.conf
POST_INSTALL="reload-nvidia-peermem.sh"

[scaronni]

@cyqsimon can I get some feedback? To test:

$ git clone https://github.com/scaronni/dkms.git
$ cd dkms
$ git checkout patches_and_scripts_in_etc
$ make
$ sudo cp dkms $(which dkms)

[amilonenv]

LGTM

[scaronni]

@cyqsimon any chance for some feedback?

[cyqsimon]

Please forgive me for the slow response; some minor personal health issues these couple of days is limiting my free time and energy.

If you are in a rush please proceed with the merge. Otherwise I will take a look later tonight or perhaps tomorrow.

[scaronni]

@cyqsimon I'll wait until the end of the week, no problem. Take care!

[cyqsimon]

This PR is much more feature-rich than my needs. I only need the simple "new patches in /etc feature", so that's all I've tested. And so far everything seems to work great.

Thanks all for the effort.