Fedora¶

Debuginfo¶

To debug python3-cryptography, install debug symbols:

sudo dnf debuginfo-install python3-cryptography

Download a source RPM¶

sudo yum install yum-utils
yumdownloader --source <package>
# install build dependencies:
yum-builddep python

You may have to enable “Source” repositories: see also “yumdownloader –enablerepo=xxx” option.

Search a package without updating yum cache¶

yum search -C pattern

Which package provides the program route?¶

$ rpm -qf $(which route)
net-tools-2.0-0.15.20131119git.fc20.x86_64

Or if the package is not installed:

$ yum whatprovides route
...
net-tools-2.0-0.15.20131119git.fc20.x86_64 : Basic networking tools
...
Nom de fichier: /usr/sbin/route

Listing the files in a package¶

rpm -ql mongodb-server

Install dependencies to build the package digikam¶

yum-builddep digikam

Packages¶

https://apps.fedoraproject.org/packages/
Example with gdb: https://apps.fedoraproject.org/packages/s/gdb
https://koji.fedoraproject.org/koji/ : server where packages are built

Install manually a different version, package already installed:

rpm -e gdb-8.2.50.20181010-5.fc30.x86_64.rpm

Rebuild a Fedora package¶

Rebuild a package: Fedora Source RPM.

If you get a .src.rpm package, you can rebuild it with:

rpmbuild --rebuild wrk-3.1.0-1.fc21.src.rpm

Unpack RPM¶

Unpack file.rpm in a new dir/ subdirectory:

mkdir dir
cp file.rpm dir/
cd dir
rpm2cpio file.rpm | cpio -idmv

sudo: add user to wheel group¶

usermod -aG wheel vstinner

Python¶

Multiple Python interpreters

Upgrade¶

Upgrade Fedora 29 to Fedora 30 in command line:

# sudo dnf upgrade --refresh
sudo dnf install dnf-plugin-system-upgrade
sudo dnf system-upgrade download --refresh --releasever=34 --allowerasing # --skip-broken
sudo dnf system-upgrade reboot
# at first boot on the new Fedora, fix SELinux labels:
sudo fixfiles -B onboot
# and reboot

https://fedoraproject.org/wiki/DNF_system_upgrade

ABRT¶

ABRT components¶

/usr/bin/abrt-applet
/usr/bin/abrt-dump-journal-core run by abrt-journal-core.service
/usr/sbin/abrtd run by abrtd.service
/usr/sbin/abrt-dbus run by DBus activation
/usr/bin/abrt-dump-journal-oops run by abrt-oops.service

Ignore crashes in $HOME¶

Edit BlackListedPaths in /etc/abrt/abrt-action-save-package-data.conf:

$ sudo vim /etc/abrt/abrt-action-save-package-data.conf
BlackListedPaths = (...), /home/vstinner/*

where (...) was the existing configuration. Full example:

BlackListedPaths = /usr/share/doc/*, */example*, /usr/bin/nspluginviewer, /usr/lib*/firefox/plugin-container, /home/vstinner/*

Rawhide and GPG keys¶

Rawhide: https://fedoraproject.org/wiki/Releases/Rawhide

GPG:

$ rpm -qf /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-31-x86_64
fedora-gpg-keys-31-0.2.noarch

Import Fedora’s GPG key(s) (command comming from https://getfedora.org/security/):

curl https://getfedora.org/static/fedora.gpg | gpg –import

Last resort: disable gpgcheck in /etc/yum.repos.d/fedora-rawhide.repo (then reenable it).

List all packages installed on the system¶

Using dnf:

dnf history userinstalled

Using rpm:

rpm -qa

dnf: file … of xxx conflicts with file from package yyy¶

Attempt dnf remove xxx.

If it’s really not possible:

dnf download yyy
sudo rpm -ihv --force <downloaded RPM file>

RPM specfile¶

%bcond_without rpmwheels enables rpmwheels feature (true)
%bcond_with rpmwheels disables rpmwheels feature (false)

Change root password¶

Official doc: https://docs.fedoraproject.org/en-US/quick-docs/reset-root-password/

At boot, hold the CTRL key
In GRUB, select the latest kernel with up/down keys, press “e”, edit the “linux” line, add rw init=/bin/bash, press CTRL+x or F10 to boot.

In bash, type:

# mount -o remount,rw /  # if you forgot rw
# passwd
<enter new root password here>
# touch /.autorelabel
# sync
# /sbin/reboot -f

The touch /.autorelabel command recreate SELinux labels, especially on the /etc/shadow file (label: system_u:object_r:shadow_t:s0).