learning
/
rpm_tut
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
master
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'master'
${ noResults }
rpm_tut/rpm_packaging_guide_tut/patching/README.md

1.0 KiB
Raw Permalink Blame History

Patching

A patch is a source code that updates other source code. It is formatted as a diff, because it represents what is different between two versions of text. You create a diff with thie diff utility, which is then applied to the source code using the patch utility.

NOTE: Other version control systems like git provide their own methods of creating diffs or patching software.

This is an example where we are creating a patch from the original source code using diff and then applying it via patch.

Patching in 6 easy-ish steps

Preserve the original source code

cp cello.c cello.c.orig

Change the source code

Generate a patch using the diff utility

diff -Naur cello.c.orig cello.c

Save the patch to a file

diff -Naur cello.c.orig cello.c > cello-output-first-patch.patch

Restore the original file

cp cello.c.orig cello.c

Patch the original with the contents of the new patch file using the patch utility

patch < cello-output-first.patch