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Add support for a rescue (recovery) mode from kernel cmdline

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This patch adds a rescue (revovery) mode to Finit.  Simply add `rescue`
to the kernel cmdline at boot and the following steps at bootstrap will
be skipped:

- Load of services/run/task/etc in /etc/finit.conf + /etc/finit.d/*.conf
- fsck of filesystems in /etc/fstab
- Remount of / to read-write
- Mount of all filesystems in /etc/fstab
- swapon
- A few plugin hooks:
  - HOOK_ROOTFS_UP
  - HOOK_MOUNT_ERROR
  - HOOK_BASEFS_UP
- `runparts DIR`
- /etc/rc.local

Instead of loading /etc/finit.conf and /etc/finit.d/*.conf Finit loads
the file /lib/finit/rescue.conf, which can be overridden by the operator
if needed.  If this file is removed (or lost), Finit falls back to start
a simple root shell, without any login.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson committed 2017-12-30 21:20:06 +01:00
1 parent bc149d95fc
commit ab723d2f31
7 files changed
+58 -23
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src/finit.c
+29 -20
View File
@@ -53,6 +53,7 @@ int wdogpid = 0; /* No watchdog by default */
int runlevel = 0; /* Bootstrap 'S' */
int cfglevel = RUNLEVEL; /* Fallback if no configured runlevel */
int prevlevel = -1;
int rescue = 0; /* rescue mode from kernel cmdline */
char *sdown = NULL;
char *network = NULL;
char *hostname = NULL;
@@ -262,18 +263,20 @@ static void finalize(void)
/*
* Network stuff
*/
_d("Setting up networking ...");
networking();
umask(022);
if (!rescue) {
_d("Setting up networking ...");
networking();
/* Hooks that rely on loopback, or basic networking being up. */
_d("Calling all network up hooks ...");
plugin_run_hooks(HOOK_NETWORK_UP);
/* Hooks that rely on loopback, or basic networking being up. */
_d("Calling all network up hooks ...");
plugin_run_hooks(HOOK_NETWORK_UP);
}
umask(022);
/*
* Run startup scripts in the runparts directory, if any.
*/
if (runparts && fisdir(runparts)) {
if (runparts && fisdir(runparts) && !rescue) {
_d("Running startup scripts in %s ...", runparts);
run_parts(runparts, NULL);
if (conf_any_change())
@@ -296,7 +299,7 @@ static void finalize(void)
service_step_all(SVC_TYPE_ANY);
/* Convenient SysV compat for when you just don't care ... */
if (!access(FINIT_RC_LOCAL, X_OK)) {
if (!access(FINIT_RC_LOCAL, X_OK) && !rescue) {
run_interactive(FINIT_RC_LOCAL, "Calling %s", FINIT_RC_LOCAL);
if (conf_any_change())
service_reload_dynamic();
@@ -385,7 +388,7 @@ int main(int argc, char* argv[])
/*
* Check file filesystems in /etc/fstab
*/
for (int pass = 1; pass < 10; pass++) {
for (int pass = 1; pass < 10 && !rescue; pass++) {
if (fsck(pass))
break;
}
@@ -479,12 +482,14 @@ int main(int argc, char* argv[])
/*
* Mount filesystems
*/
if (!rescue) {
#ifdef REMOUNT_ROOTFS
run("mount -n -o remount,rw /");
run("mount -n -o remount,rw /");
#endif
#ifdef SYSROOT
mount(SYSROOT, "/", NULL, MS_MOVE, NULL);
mount(SYSROOT, "/", NULL, MS_MOVE, NULL);
#endif
}
/* Debian has this little script to copy generated rules while the system was read-only */
if (fexist("/lib/udev/udev-finish"))
@@ -493,15 +498,17 @@ int main(int argc, char* argv[])
/* Bootstrap conditions, needed for hooks */
cond_init();
_d("Root FS up, calling hooks ...");
plugin_run_hooks(HOOK_ROOTFS_UP);
if (!rescue) {
_d("Root FS up, calling hooks ...");
plugin_run_hooks(HOOK_ROOTFS_UP);
umask(0);
if (run_interactive("mount -na", "Mounting filesystems"))
plugin_run_hooks(HOOK_MOUNT_ERROR);
umask(0);
if (run_interactive("mount -na", "Mounting filesystems"))
plugin_run_hooks(HOOK_MOUNT_ERROR);
run("swapon -ea");
umask(0022);
run("swapon -ea");
umask(0022);
}
/* Base FS up, enable standard SysV init signals */
sig_setup(&loop);
@@ -512,8 +519,10 @@ int main(int argc, char* argv[])
*/
conf_monitor(&loop);
_d("Base FS up, calling hooks ...");
plugin_run_hooks(HOOK_BASEFS_UP);
if (!rescue) {
_d("Base FS up, calling hooks ...");
plugin_run_hooks(HOOK_BASEFS_UP);
}
/*
* Initalize state machine and start all bootstrap tasks