This patchset allows systemd to parse resume= kernel command line parameter and initiate resume from the specified device.
It adds: - a 'systemd-hibernate-resume' tool which takes path to a device node and writes its major:minor to /sys/power/resume; - a corresponding 'systemd-hibernate-resume@.service' templated unit; - a 'systemd-hibernate-resume-generator' generator which parses the kernel command line and instantiates the unit as necessary. This functionality already exists in-kernel, but only for "/dev/sdXY"-style pathes. Implementing it in userspace allows to use arbitrary udev-created symlinks, e. g. persistent block device pathes ("/dev/disk/by-foo/bar") or fstab-like specifiers ("FOO=bar"). Userspace parsing of resume= kernel command line parameter has been traditionally done in initramfs via shell scripts (for Arch Linux, this is "resume" mkinitcpio hook), so I feel that this feature has its place within systemd. Due to the nature of hibernation, the resume unit must be activated before any modifications to filesystems take place. This can happen only in initramfs before mounting anything. So, first patch orders all non-root fsck after local-fs-pre.target, which in turn allows to order the resume unit before those fsck instances. Second and third patches add the tool, the unit and the generator. Thanks for reviewing! v2: fix issues pointed out by Andrei: - don't RemainAfterExit because it's useless - don't attempt to resume outside of initramfs because it's unsafe (reiserfs replays journal even if mounted RO) v3: fix mistakes spotted by Thomas: - return 0 in main path of resume.c:process_resume() - fix type and add missing cleanup attribute in resume-generator.c:main() v4: drop the [RFC] prefix as there are no more issues with this approach; incorporate feedback from Lennart: - fix indentation in resume-generator.c:parse_proc_cmdline_item() - remove overly aggressive 80-column line breaks - don't Before=usr.mount and After=systemd-udevd.service as the respective configurations are deemed broken - reword the "Failed to resume" message and downgrade it to log_info() v5: add the binaries and preprocessed unit to respective .gitignore files incorporate feedback from Lennart: - rename systemd-resume-* to systemd-hibernate-resume-* incorporate feedback from Dave: - use fstab_node_to_udev_node() in the generator to also handle fstab-like specifiers Ivan Shapovalov (3): units: order systemd-fsck@.service after local-fs-pre.target. hibernate-resume: add a tool to write a device node's major:minor to /sys/power/resume. hibernate-resume-generator: add a generator for instantiating the resume unit. .gitignore | 2 + Makefile-man.am | 21 +++---- Makefile.am | 28 +++++++-- man/kernel-command-line.xml | 14 ++++- man/systemd-hibernate-resume-generator.xml | 93 +++++++++++++++++++++++++++++ man/systemd-hibernate-res...@.service.xml | 81 +++++++++++++++++++++++++ src/hibernate-resume/Makefile | 1 + src/hibernate-resume/hibernate-resume.c | 81 +++++++++++++++++++++++++ src/resume-generator/Makefile | 1 + src/resume-generator/resume-generator.c | 95 ++++++++++++++++++++++++++++++ units/.gitignore | 1 + units/systemd-f...@.service.in | 2 +- units/systemd-hibernate-res...@.service.in | 20 +++++++ 13 files changed, 422 insertions(+), 18 deletions(-) create mode 100644 man/systemd-hibernate-resume-generator.xml create mode 100644 man/systemd-hibernate-res...@.service.xml create mode 120000 src/hibernate-resume/Makefile create mode 100644 src/hibernate-resume/hibernate-resume.c create mode 120000 src/resume-generator/Makefile create mode 100644 src/resume-generator/resume-generator.c create mode 100644 units/systemd-hibernate-res...@.service.in -- 2.1.0 _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel