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Add support for freebsd and various small fixes - #16
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Empty parentheses declare an unspecified argument list in C; use (void) for the functions that take no arguments so the compiler checks call sites. No behavioural change. DEBUG_PRINT was declared variadic (fmt, ...) but its body never expands the arguments, and invoking a variadic macro with no variadic argument is not portable under -pedantic-errors. It is only ever used with a bare format string, so drop the variadic parameter. Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Most applications expect a writable /tmp. Mount a tmpfs there in mount_special_fs; urunit itself does not depend on it, so a failure is logged but not fatal. Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Declare the platform-specific hooks in common.h (setup_console, remount_root_rw, get_boot_var, read_raw_device, configure_network) and the struct net_config they use, and provide their Linux implementations: no-ops where the kernel already handles the concern (console, remount, boot vars, network via ip=). This is the seam FreeBSD support plugs into. The configuration may be handed to the guest as a tiny (virtio) block or character device rather than a regular file. read_file_and_size now detects that from st_mode and dispatches to the platform read_raw_device, which reads the whole device; regular files keep the stdio path. Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
When URUNIT_CONFIG / URUNIT_DEFROUTE are not in the process environment, consult the kernel boot variables via get_boot_var (used when the kernel passes parameters through its environment, e.g. FreeBSD as init). Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
When urunit is started with no command line (e.g. by the FreeBSD kernel as init), take the application and its arguments from the UCS/UCE section of the configuration (ARC count + verbatim ARV arguments). Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Implement the platform hooks for FreeBSD in src/freebsd.c (console via /dev/console, kenv boot vars, raw virtio config device, network via the routing socket, root remount, tmpfs, subreaper via procctl, reboot) and add the Makefile rule that builds it when TARGET_OS is FreeBSD. Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Parse the UNS/UNE section (IP/GW/MSK) and hand it to the platform configure_network hook, for guests that cannot get the network from the kernel command line. No-op on Linux (network comes from ip=). Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Describe the UCS/UCE application-command section and the UNS/UNE network section of the configuration file in the README. Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
Signed-off-by: Charalampos Mainas <charalampos.mainas@gmail.com>
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This PR adds a platform-abstraction layer to
urunitand a FreeBSD implementation of it, plus new configuration fields for passing the command arguments and the network config.Until now
urunitwas Linux-only and relied on the Linux kernel to hand over things like the console, the network, and a writable root. However, this is not the case for FreeBSD and all the previously mentioned functionalities are now handled by urunit. The OS-specific pieces are moved behind a small platform interface. Linux and FreeBSD each provide their own implementation, and the shared logic stays free of per-OS branching.On top of that, the configuration can be read from a regular file or straight from a raw device, since FreeBSD does not expose initrd in the same way as Linux.