mirror of
https://github.com/systemd/systemd.git
synced 2024-12-20 23:53:38 +08:00
b67f541f13
Let's try to standardize on a single non-cryptographic hash algorithm, and for that SipHash appears to be the best answer. With this change there are two other hash functions left in systemd: an older version of MurmurHash embedded into libudev for the bloom filters in udev messages (which is hard to update, given that the we probably should stay compatible with older versions of the library). And lookup3 in the journal files (which we could replace for new files, but which is probably not worth the work).
199 lines
7.0 KiB
Plaintext
199 lines
7.0 KiB
Plaintext
systemd System and Service Manager
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DETAILS:
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http://0pointer.de/blog/projects/systemd.html
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WEB SITE:
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http://www.freedesktop.org/wiki/Software/systemd
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GIT:
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git://anongit.freedesktop.org/systemd/systemd
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ssh://git.freedesktop.org/git/systemd/systemd
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GITWEB:
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http://cgit.freedesktop.org/systemd/systemd
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MAILING LIST:
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http://lists.freedesktop.org/mailman/listinfo/systemd-devel
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http://lists.freedesktop.org/mailman/listinfo/systemd-commits
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IRC:
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#systemd on irc.freenode.org
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BUG REPORTS:
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https://bugs.freedesktop.org/enter_bug.cgi?product=systemd
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AUTHOR:
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Lennart Poettering
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Kay Sievers
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...and many others
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LICENSE:
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LGPLv2.1+ for all code
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- except sd-daemon.[ch] and sd-readahead.[ch] which are MIT
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- except src/shared/MurmurHash2.c which is Public Domain
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- except src/shared/siphash24.c which is CC0 Public Domain
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- except src/journal/lookup3.c which is Public Domain
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- except src/udev/* which is (currently still) GPLv2, GPLv2+
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REQUIREMENTS:
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Linux kernel >= 3.0
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CONFIG_DEVTMPFS
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CONFIG_CGROUPS (it's OK to disable all controllers)
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CONFIG_INOTIFY_USER
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CONFIG_SIGNALFD
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CONFIG_TIMERFD
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CONFIG_EPOLL
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CONFIG_NET
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CONFIG_SYSFS
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CONFIG_PROC_FS
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Linux kernel >= 3.8 for Smack support
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Udev will fail to work with the legacy layout:
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CONFIG_SYSFS_DEPRECATED=n
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Legacy hotplug slows down the system and confuses udev:
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CONFIG_UEVENT_HELPER_PATH=""
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Userspace firmware loading is deprecated, will go away, and
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sometimes causes problems:
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CONFIG_FW_LOADER_USER_HELPER=n
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Some udev rules and virtualization detection relies on it:
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CONFIG_DMIID
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Mount and bind mount handling might require it:
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CONFIG_FHANDLE
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Support for some SCSI devices serial number retrieval, to
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create additional symlinks in /dev/disk/ and /dev/tape:
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CONFIG_BLK_DEV_BSG
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Optional but strongly recommended:
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CONFIG_IPV6
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CONFIG_AUTOFS4_FS
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CONFIG_TMPFS_POSIX_ACL
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CONFIG_TMPFS_XATTR
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CONFIG_SECCOMP
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For systemd-bootchart, several proc debug interfaces are required:
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CONFIG_SCHEDSTATS
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CONFIG_SCHED_DEBUG
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For UEFI systems:
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CONFIG_EFI_VARS
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CONFIG_EFI_PARTITION
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Note that kernel auditing is broken when used with systemd's
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container code. When using systemd in conjunction with
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containers, please make sure to either turn off auditing at
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runtime using the kernel command line option "audit=0", or
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turn it off at kernel compile time using:
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CONFIG_AUDIT=n
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glibc >= 2.14
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libcap
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libblkid >= 2.20 (from util-linux) (optional)
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libkmod >= 15 (optional)
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PAM >= 1.1.2 (optional)
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libcryptsetup (optional)
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libaudit (optional)
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libacl (optional)
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libattr (optional)
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libselinux (optional)
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liblzma (optional)
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tcpwrappers (optional)
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libgcrypt (optional)
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libqrencode (optional)
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libmicrohttpd (optional)
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libpython (optional)
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make, gcc, and similar tools
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During runtime, you need the following additional
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dependencies:
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util-linux >= v2.19 (requires fsck -l, agetty -s),
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v2.21 required for tests in test/
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dbus >= 1.4.0 (strictly speaking optional, but recommended)
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sulogin (from util-linux >= 2.22 or sysvinit-tools, optional but recommended,
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required for tests in test/)
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dracut (optional)
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PolicyKit (optional)
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When building from git, you need the following additional
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dependencies:
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docbook-xsl
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xsltproc
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automake
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autoconf
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libtool
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intltool
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gperf
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gtkdocize (optional)
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python (optional)
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sphinx (optional)
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python-lxml (entirely optional)
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When systemd-hostnamed is used, it is strongly recommended to
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install nss-myhostname to ensure that, in a world of
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dynamically changing hostnames, the hostname stays resolvable
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under all circumstances. In fact, systemd-hostnamed will warn
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if nss-myhostname is not installed.
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To build HTML documentation for python-systemd using sphinx,
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please first install systemd (using 'make install'), and then
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invoke sphinx-build with 'make sphinx-<target>', with <target>
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being 'html' or 'latexpdf'. If using DESTDIR for installation,
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pass the same DESTDIR to 'make sphinx-html' invocation.
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USERS AND GROUPS:
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Default udev rules use the following standard system group
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names, which need to be resolvable by getgrnam() at any time,
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even in the very early boot stages, where no other databases
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and network are available:
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tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk
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During runtime, the journal daemon requires the
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"systemd-journal" system group to exist. New journal files will
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be readable by this group (but not writable), which may be used
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to grant specific users read access.
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It is also recommended to grant read access to all journal
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files to the system groups "wheel" and "adm" with a command
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like the following in the post installation script of the
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package:
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# setfacl -nm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/
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The journal gateway daemon requires the
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"systemd-journal-gateway" system user and group to
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exist. During execution this network facing service will drop
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privileges and assume this uid/gid for security reasons.
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WARNINGS:
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systemd will warn you during boot if /etc/mtab is not a
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symlink to /proc/mounts. Please ensure that /etc/mtab is a
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proper symlink.
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systemd will warn you during boot if /usr is on a different
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file system than /. While in systemd itself very little will
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break if /usr is on a separate partition, many of its
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dependencies very likely will break sooner or later in one
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form or another. For example, udev rules tend to refer to
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binaries in /usr, binaries that link to libraries in /usr or
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binaries that refer to data files in /usr. Since these
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breakages are not always directly visible, systemd will warn
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about this, since this kind of file system setup is not really
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supported anymore by the basic set of Linux OS components.
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For more information on this issue consult
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http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken
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To run systemd under valgrind, compile with VALGRIND defined
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(e.g. ./configure CPPFLAGS='... -DVALGRIND=1'). Otherwise,
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false positives will be triggered by code which violates
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some rules but is actually safe.
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