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devd: Warn for deprecated 'kern' system type 

One year ago, I deprecated 'kern' in favor of 'kernel' for the system
name for some power events. I'm about to remove it from the kernel, but
realized there's been no warning generated for users. Preserve POLA by
converting on the fly here and issuing a warning for 14.x, and an fatal
error after we branch 15. Make compiling it an error on 16 to remove
the gross hack after we branch.

Sponsored by:		Netflix
Reviewed by:		bapt
Differential Revision:	https://reviews.freebsd.org/D37584
This commit is contained in:
Warner Losh 2022-12-02 10:47:22 -07:00
parent 8d147537bf
commit 7652743540
2 changed files with 34 additions and 2 deletions
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34
sbin/devd/devd.cc
View File

@ -173,6 +173,8 @@ delete_and_clear(vector<T *> &v)
static config cfg;
static const char *curr_cf = NULL;
event_proc::event_proc() : _prio(-1)
{
_epsvec.reserve(4);
@ -452,17 +454,28 @@ config::reset(void)
delete_and_clear(_notify_list);
}
/*
* Called recursively as new files are included, so current stack of old names
* saved in each instance of 'old' on the call stack. Called single threaded
* so global varaibles curr_cf and lineno (and all of yacc's parser state)
* are safe to access w/o a lock.
*/
void
config::parse_one_file(const char *fn)
{
const char *old;
devdlog(LOG_DEBUG, "Parsing %s\n", fn);
yyin = fopen(fn, "r");
old = curr_cf;
curr_cf = fn;
if (yyin == NULL)
err(1, "Cannot open config file %s", fn);
lineno = 1;
if (yyparse() != 0)
errx(1, "Cannot parse %s at line %d", fn, lineno);
fclose(yyin);
curr_cf = old;
}
void
@ -1194,6 +1207,27 @@ new_action(const char *cmd)
eps *
new_match(const char *var, const char *re)
{
/*
* In FreeBSD 14, we changed the system=kern to system=kernel for the
* resume message to match all the other 'kernel' messages. Generate a
* warning for the life of 14.x that we've 'fixed' the file on the fly,
* but make it a fatal error in 15.x and newer.
*/
if (strcmp(var, "kern") == 0) {
#if __FreeBSD_version < 1500000
devdlog(LOG_WARNING,
"Changing deprecated system='kern' to new name 'kernel' in %s line %d.",
curr_cf, lineno);
free(const_cast<char *>(var));
var = strdup("kernel");
#elif __FreeBSD_version < 1600000
errx(1, "Encountered deprecated system=\"kern\" rule in %s line %d",
curr_cf, lineno);
#else
#error "Remove this gross hack"
#endif
}
eps *e = new match(cfg, var, re);
free(const_cast<char *>(var));
free(const_cast<char *>(re));

2
sys/kern/kern_devctl.c
View File

@ -568,5 +568,3 @@ devctl_safe_quote_sb(struct sbuf *sb, const char *src)
sbuf_putc(sb, *src++);
}
}