doc: add a hook examples doc (currently just a post install one)

somasis · Jul 2, 2015 · 5ed2d22 · 5ed2d22
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+# Examples of kernel_* functions
+
+## Post install
+On my machine, I use gummiboot for managing the boot process.
+So, my kernel_post_install() is...
+
+    kernel_post_install() {
+        default_kernel_post_install "$@"
+        sed -e "s#^linux /vmlinuz-.*#linux /vmlinuz-${target_version//v}#" -i /boot/loader/entries/exherbo.conf
+    }
+
+Which changes the kernel line in the gummiboot configuration to use the
+new kernel version, so I don't have to do it by hand.