mirror of https://github.com/nocturn9x/nimd.git
Modularized the system further, added mounting of virtual filesystems
This commit is contained in:
Nocturn9x
parent
c6f6fcb54e
commit
7652a2c1cf
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# nimd
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A minimal init system written in Nim
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A minimal, self-contained dependency-based Linux init system written in Nim
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@ -0,0 +1,49 @@
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# Copyright 2021 Mattia Giambirtone & All Contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import segfaults # Makes us catch segfaults as NilAccessDefect exceptions!
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import strformat
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import posix
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import os
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import ../util/[logging, disks, misc]
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proc mainLoop*(logger: Logger, mountDisks: bool = true) =
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## NimD's main execution loop
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try:
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if mountDisks:
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logger.info("Mounting virtual disks")
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mountVirtualDisks(logger)
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logger.info("Mounting real disks")
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mountRealDisks(logger)
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else:
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logger.info("Skipping disk mounting, did we restart after a critical error?")
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except IndexDefect: # Check parseFileSystemTable for more info on this catch block
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logger.fatal("Improperly formatted /etc/fstab, exiting")
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nimDExit(logger, 131)
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logger.info("Disks mounted")
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logger.info("Processing boot runlevel")
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# TODO
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logger.info("Processing default runlevel")
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# TODO
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logger.info("System initialization complete, going idle")
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while true:
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try:
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# TODO
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sleepSeconds(5)
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except:
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logger.critical(&"A critical error has occurred while running, restarting the mainloop! Error -> {getCurrentExceptionMsg()}")
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# We *absolutely* cannot die
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mainLoop(logger, mountDisks=false)
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42
src/main.nim
42
src/main.nim
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@ -16,43 +16,13 @@ import strformat
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import posix
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import os
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import util/[logging, constants, mount]
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proc sleepSeconds(amount: SomeInteger) = sleep(amount * 1000)
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proc handleControlC {.noconv.} =
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getDefaultLogger().warning("Main process received SIGINT: exiting") # TODO: Call exit point
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quit(0)
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proc mainLoop(logger: Logger) =
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## NimD's main execution loop
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try:
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logger.info("Reading disk entries from /etc/fstab")
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for entry in parseFileSystemTable(readFile("/etc/fstab")):
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logger.debug(&"Mounting filesystem {entry.source} of type {entry.filesystemtype} at {entry.target} with mountflags {entry.mountflags} and mount options {entry.data}")
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logger.trace("Calling mount()")
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var retcode = mount(entry.source, entry.target, entry.filesystemtype, entry.mountflags, entry.data)
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logger.trace(&"mount() returned {retcode}")
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if retcode == -1:
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logger.warning(&"Mounting disk {entry.source} has failed with error {posix.errno}: {posix.strerror(posix.errno)}")
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else:
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logger.debug(&"Mounted {entry.source} at {entry.target}")
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posix.errno = cint(0)
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except IndexDefect:
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logger.fatal("Improperly formatted /etc/fstab, exiting")
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quit(131)
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logger.info("Disks mounted")
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while true:
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logger.info("NimD is running")
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sleepSeconds(5)
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# NimD's own stuff
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import util/[logging, constants, misc]
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import core/mainloop
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proc main(logger: Logger) =
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## NimD entry point
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## NimD's entry point
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logger.debug("Starting NimD: A minimal, self-contained dependency-based Linux init system written in Nim")
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logger.info(&"NimD version {NimdVersion.major}.{NimdVersion.minor}.{NimdVersion.patch} is starting up...")
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logger.trace("Calling getCurrentProcessId()")
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@ -84,7 +54,7 @@ when isMainModule:
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echo helpMessage
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quit(0)
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of "version":
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echo &"NimD version {NimdVersion.major}.{NimdVersion.minor}.{NimdVersion.patch} ({CompileDate}, {CompileTime}, {hostOS}, {hostCPU}) compiled with Nim {NimVersion}"
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echo NimDVersionString
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quit(0)
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of "verbose":
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logger.setLevel(LogLevel.Debug)
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@ -99,7 +69,7 @@ when isMainModule:
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echo helpMessage
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quit(0)
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of "v":
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echo &"NimD version {NimdVersion.major}.{NimdVersion.minor}.{NimdVersion.patch} ({CompileDate}, {CompileTime}, {hostOS}, {hostCPU}) compiled with Nim {NimVersion}"
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echo NimDVersionString
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quit(0)
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of "V":
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logger.setLevel(LogLevel.Debug)
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@ -11,8 +11,11 @@
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import strformat
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const NimdVersion*: tuple[major, minor, patch: int] = (major: 0, minor: 0, patch: 1)
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const NimDVersion*: tuple[major, minor, patch: int] = (major: 0, minor: 0, patch: 1)
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const NimDVersionString* = &"NimD version {NimDVersion.major}.{NimDVersion.minor}.{NimDVersion.patch} ({CompileDate}, {CompileTime}, {hostOS}, {hostCPU}) compiled with Nim {NimVersion}"
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const helpMessage* = """The NimD init system, Copyright (C) 2021 Mattia Giambirtone & All contributors
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This program is free software, see the license distributed with this program or check
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@ -0,0 +1,94 @@
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# Copyright 2021 Mattia Giambirtone & All Contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import strutils
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import sequtils
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import strformat
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import posix
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import logging
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import misc
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const virtualFileSystems: seq[tuple[source: cstring, target: cstring, filesystemtype: cstring, mountflags: culong, data: cstring]] = @[
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(source: cstring("proc"), target: cstring("/proc"), filesystemtype: cstring("proc"), mountflags: culong(0), data: cstring("nosuid,noexec,nodev")),
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(source: cstring("sys"), target: cstring("/sys"), filesystemtype: cstring("sysfs"), mountflags: culong(0), data: cstring("nosuid,noexec,nodev")),
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(source: cstring("run"), target: cstring("/run"), filesystemtype: cstring("tmpfs"), mountflags: culong(0), data: cstring("mode=0755,nosuid,nodev")),
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(source: cstring("dev"), target: cstring("/dev"), filesystemtype: cstring("devtmpfs"), mountflags: culong(0), data: cstring("mode=0755,nosuid")),
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(source: cstring("devpts"), target: cstring("/dev/pts"), filesystemtype: cstring("devpts"), mountflags: culong(0), data: cstring("mode=0620,gid=5,nosuid,noexec")),
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(source: cstring("shm"), target: cstring("/dev/shm"), filesystemtype: cstring("tmpfs"), mountflags: culong(0), data: cstring("mode=1777,nosuid,nodev")),
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]
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proc parseFileSystemTable*(fstab: string): seq[tuple[source: cstring, target: cstring, filesystemtype: cstring, mountflags: culong, data: cstring]] =
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## Parses the contents of the given file (the contents of /etc/fstab)
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## and returns a sequence of tuples with elements source, target,
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## filesystemtype, mountflags and data as required by mount in sys/mount.h
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## which is wrapped below. An improperly formatted fstab will cause this
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## function to error out with an IndexDefect exception (when an fstab entry is
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## incomplete) that should be caught by the caller. No other checks other than
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## very basic syntax are performed, as that job is delegated to the operating
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## system.
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var temp: seq[string] = @[]
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var line: string = ""
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for l in fstab.splitlines():
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line = l.strip().replace("\t", " ")
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if line.startswith("#"):
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continue
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if line.isEmptyOrWhitespace():
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continue
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# This madness will make sure we only get (hopefully) 6 entries
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# in our temporary list
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temp = line.split().filterIt(it != "").join(" ").split(maxsplit=6)
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result.add((source: cstring(temp[0]), target: cstring(temp[1]), filesystemtype: cstring(temp[2]), mountflags: culong(0), data: cstring(temp[3])))
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proc mount*(source: cstring, target: cstring, filesystemtype: cstring,
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mountflags: culong, data: pointer): cint {.header: "sys/mount.h", importc.}
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proc mountRealDisks*(logger: Logger) =
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## Mounts real disks from /etc/fstab
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try:
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logger.info("Reading disk entries from /etc/fstab")
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for entry in parseFileSystemTable(readFile("/etc/fstab")):
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logger.debug(&"Mounting filesystem {entry.source} ({entry.filesystemtype}) at {entry.target} with mount option(s) {entry.data}")
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logger.trace(&"Calling mount({entry.source}, {entry.target}, {entry.filesystemtype}, {entry.mountflags}, {entry.data})")
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var retcode = mount(entry.source, entry.target, entry.filesystemtype, entry.mountflags, entry.data)
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logger.trace(&"mount({entry.source}, {entry.target}, {entry.filesystemtype}, {entry.mountflags}, {entry.data}) returned {retcode}")
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if retcode == -1:
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logger.error(&"Mounting disk {entry.source} has failed with error {posix.errno}: {posix.strerror(posix.errno)}")
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# Resets the error code
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posix.errno = cint(0)
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else:
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logger.debug(&"Mounted {entry.source} at {entry.target}")
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except IndexDefect: # Check parseFileSystemTable for more info on this catch block
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logger.fatal("Improperly formatted /etc/fstab, exiting")
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nimDExit(logger, 131)
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proc mountVirtualDisks*(logger: Logger) =
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## Mounts POSIX virtual filesystems/partitions,
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## such as /proc and /sys
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for entry in virtualFileSystems:
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logger.debug(&"Mounting filesystem {entry.source} ({entry.filesystemtype}) at {entry.target} with mount option(s) {entry.data}")
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logger.trace(&"Calling mount({entry.source}, {entry.target}, {entry.filesystemtype}, {entry.mountflags}, {entry.data})")
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var retcode = mount(entry.source, entry.target, entry.filesystemtype, entry.mountflags, entry.data)
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logger.trace(&"mount({entry.source}, {entry.target}, {entry.filesystemtype}, {entry.mountflags}, {entry.data}) returned {retcode}")
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if retcode == -1:
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logger.error(&"Mounting disk {entry.source} has failed with error {posix.errno}: {posix.strerror(posix.errno)}")
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# Resets the error code
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posix.errno = cint(0)
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logger.fatal("Failed mounting vital system disk partition, system is likely corrupted, booting cannot continue")
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nimDExit(logger, 131) # ENOTRECOVERABLE - State not recoverable
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else:
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logger.debug(&"Mounted {entry.source} at {entry.target}")
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@ -0,0 +1,35 @@
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# Copyright 2021 Mattia Giambirtone & All Contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import logging
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proc nimDExit*(logger: Logger, code: int) =
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logger.warning("The system is being shut down, beginning child process termination")
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# TODO
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logger.info("Processing shutdown runlevel")
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# TODO
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logger.warning("Process termination complete, sending final shutdown signal")
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# TODO
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quit(code)
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proc sleepSeconds*(amount: SomeInteger) = sleep(amount * 1000)
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proc handleControlC* {.noconv.} =
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getDefaultLogger().warning("Main process received SIGINT: exiting") # TODO: Call exit point
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nimDExit(getDefaultLogger(), 130) # Exit code 130 indicates a SIGINT
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@ -1,40 +0,0 @@
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# Copyright 2021 Mattia Giambirtone & All Contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import strutils
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import sequtils
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proc parseFileSystemTable*(fstab: string): seq[tuple[source: cstring, target: cstring, filesystemtype: cstring, mountflags: culong, data: cstring]] =
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## Parses the contents of the given file (the contents of /etc/fstab)
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## and returns a sequence of tuples with elements source, target,
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## filesystemtype, mountflags and data as required by mount in sys/mount.h
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## which is wrapped below. An improperly formatted fstab will cause this
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## function to error out with an IndexDefect exception (when an fstab entry is
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## incomplete) that should be caught by the caller. No other checks other than
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## very basic syntax are performed, as that job is delegated to the operating
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## system.
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var temp: seq[string] = @[]
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var line: string
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for l in fstab.splitlines():
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if l.strip().startswith("#"):
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continue
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if l.strip().len() == 0:
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continue
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line = l.filterIt(it != ' ').join("")
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temp = line.split(maxsplit=6)
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result.add((source: cstring(temp[0]), target: cstring(temp[1]), filesystemtype: cstring(temp[2]), mountflags: culong(0), data: cstring(temp[3])))
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proc mount*(source: cstring, target: cstring, filesystemtype: cstring,
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mountflags: culong, data: pointer): cint {.header: "sys/mount.h", importc.}
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