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docs: Update HACKING.md with the mkosi boot/qemu commands + options

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Let's use the mkosi commands in HACKING.md and recommend some options
that speed up mkosi builds. Also includes some other small improvements.
This commit is contained in:
Daan De Meyer 2021-01-23 12:16:18 +00:00 committed by Luca Boccassi
parent 4cc06b8073
commit c38667f70d
1 changed files with 22 additions and 14 deletions
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@ -44,28 +44,37 @@ generate a disk image `image.raw` you can boot either in `systemd-nspawn` or in
an UEFI-capable VM:
```
# systemd-nspawn -bi image.raw
# mkosi boot
```
or:
```
# qemu-system-x86_64 -enable-kvm -m 512 -smp 2 -bios /usr/share/edk2/ovmf/OVMF_CODE.fd -hda image.raw
# mkosi qemu
```
Every time you rerun the `mkosi` command a fresh image is built, incorporating
all current changes you made to the project tree.
all current changes you made to the project tree. To save time when rebuilding,
you can use mkosi's incremental mode (`-i`). This instructs mkosi to build a set
of cache images that make future builds a lot faster. Note that the `-i` flag
both instructs mkosi to build cached images if they don't exist yet and to use
cached images if they already exist so make sure to always specify `-i` if you
want mkosi to use the cached images.
Alternatively, you may install the systemd version from your git check-out
directly on top of your host system's directory tree. This mostly works fine,
but of course you should know what you are doing as you might make your system
unbootable in case of a bug in your changes. Also, you might step into your
package manager's territory with this. Be careful!
If you're going to build mkosi images that use the same distribution and release
that you're currently using, you can speed up the initial mkosi run by having it
reuse the host's package cache. To do this, create a mkosi override file in
mkosi.default.d/ (e.g 20-local.conf) and add the following contents:
And never forget: most distributions provide very simple and convenient ways to
install all development packages necessary to build systemd. For example, on
Fedora the following command line should be sufficient to install all of
systemd's build dependencies:
```
[Packages]
Cache=<full-path-to-package-manager-cache> # (e.g. /var/cache/dnf)
```
If you want to do a local build without mkosi, most distributions also provide
very simple and convenient ways to install all development packages necessary
to build systemd. For example, on Fedora the following command line should be
sufficient to install all of systemd's build dependencies:
```
# dnf builddep systemd
@ -84,9 +93,8 @@ $ meson build # configure the build
$ meson compile -C build # build it locally, see if everything compiles fine
$ meson test -C build # run some simple regression tests
$ ln -s .mkosi/mkosi.fedora mkosi.default # Configure mkosi to build a fedora image
$ (umask 077; echo 123 > mkosi.rootpw) # set root password used by mkosi
$ sudo mkosi # build a test image
$ sudo systemd-nspawn -bi image.raw # boot up the test image
$ sudo mkosi boot # boot up the test image
$ git add -p # interactively put together your patch
$ git commit # commit it
$ git push REMOTE HEAD:refs/heads/BRANCH