debian/prerm: add --system flag

Rasmus Villemoes · Rasmus Villemoes · commit c2536883dda9 · 2018-09-20T13:21:34.000+02:00
I was wondering why my ~/.gitconfig would sometimes end up being owned
by root, with 0600 permissions, making git unable to read it and thus
interfering with my normal workflow. Looking at the mtime/ctime of
.gitconfig, I finally correlated it with

2018-09-20 09:55:47 upgrade git-lfs:amd64 2.5.1 2.5.2
2018-09-20 09:55:47 status half-configured git-lfs:amd64 2.5.1
2018-09-20 09:55:47 status unpacked git-lfs:amd64 2.5.1
2018-09-20 09:55:47 status half-installed git-lfs:amd64 2.5.1
2018-09-20 09:55:47 status half-installed git-lfs:amd64 2.5.1
2018-09-20 09:55:47 status unpacked git-lfs:amd64 2.5.2
2018-09-20 09:55:47 status unpacked git-lfs:amd64 2.5.2

in my dpkg.log. So while the postinst script does change the global git
config, the prerm script modifies the .gitconfig of whichever user did
the "apt-get upgrade".
diff --git a/debian/prerm b/debian/prerm
@@ -1,2 +1,2 @@
 #!/bin/sh
-git lfs uninstall
+git lfs uninstall --system

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`	`1`	`#!/bin/sh`
`2`		`-git lfs uninstall`
	`2`	`+git lfs uninstall --system`