Date: Thu, 5 Jul 2018 16:25:48 +0000 (UTC) From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r335995 - in head: sys/kern sys/sys usr.sbin/config Message-ID: <201807051625.w65GPmg4038972@repo.freebsd.org>
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Author: kevans Date: Thu Jul 5 16:25:48 2018 New Revision: 335995 URL: https://svnweb.freebsd.org/changeset/base/335995 Log: kern_environment: use any provided environments, evict hintmode/envmode At the moment, hintmode and envmode are used to indicate whether static hints or static env have been provided in the kernel config(5) and the static versions are mutually exclusive with loader(8)-provided environment. hintmode *can* be reconfigured later to pull from the dynamic environment, thus taking advantage of the loader(8) or post-kmem environment setting. This changeset fixes both problems at once to move us from a semi-confusing state to a consistent state: if an environment file, hints file, or loader(8) environment are provided, we use them in a well-known order of precedence: - loader(8) environment - static environment - static hints file Once the dynamic environment is setup this becomes a moot point. The loader(8) and static environments are merged (respecting the above order of precedence), and the static hints are merged in on an as-needed basis after the dynamic environment has been setup. Hints lookup are changed to respect all of the above. Before the dynamic environment is setup, lookups use the above-mentioned order and fallback to the next environment if a matching hint is not found. Once the dynamic environment is setup, that is used on its own since it captures all of the above information plus any dynamic kenv settings that came up later in boot. The following tangentially related changes were made to res_find: - A hintp cookie is now passed in so that related searches continue using the chain of environments (or dynamic environment) without relying on global state - All three environments will be searched if they actually have valid hints to use, rather than just choosing the first environment that actually had a hint and rolling with that only The hintmode sysctl has been ripped out. static_{env,hints}.disabled are still honored and will disable their respective environments from being used for hint lookups and from being merged into the dynamic environment, as expected. MFC after: 1 month (maybe) Differential Revision: https://reviews.freebsd.org/D15953 Modified: head/sys/kern/kern_environment.c head/sys/kern/subr_hints.c head/sys/kern/tty.c head/sys/sys/systm.h head/usr.sbin/config/config.5 head/usr.sbin/config/config.h head/usr.sbin/config/config.y head/usr.sbin/config/mkmakefile.c Modified: head/sys/kern/kern_environment.c ============================================================================== --- head/sys/kern/kern_environment.c Thu Jul 5 16:18:05 2018 (r335994) +++ head/sys/kern/kern_environment.c Thu Jul 5 16:25:48 2018 (r335995) @@ -57,14 +57,21 @@ __FBSDID("$FreeBSD$"); #include <security/mac/mac_framework.h> +static char *_getenv_dynamic_locked(const char *name, int *idx); +static char *_getenv_dynamic(const char *name, int *idx); + static MALLOC_DEFINE(M_KENV, "kenv", "kernel environment"); #define KENV_SIZE 512 /* Maximum number of environment strings */ -/* pointer to the static environment */ +/* pointer to the config-generated static environment */ char *kern_envp; -static int env_len; -static int env_pos; + +/* pointer to the md-static environment */ +char *md_envp; +static int md_env_len; +static int md_env_pos; + static char *kernenv_next(char *); /* dynamic environment variables */ @@ -220,16 +227,9 @@ done: * environment obtained from a boot loader, or to provide an empty buffer into * which MD code can store an initial environment using kern_setenv() calls. * - * When a copy of an initial environment is passed in, we start by scanning that - * env for overrides to the compiled-in envmode and hintmode variables. + * kern_envp is set to the static_env generated by config(8). This implements + * the env keyword described in config(5). * - * If the global envmode is 1, the environment is initialized from the global - * static_env[], regardless of the arguments passed. This implements the env - * keyword described in config(5). In this case env_pos is set to env_len, - * causing kern_setenv() to return -1 (if len > 0) or panic (if len == 0) until - * the dynamic environment is available. The envmode and static_env variables - * are defined in env.c which is generated by config(8). - * * If len is non-zero, the caller is providing an empty buffer. The caller will * subsequently use kern_setenv() to add up to len bytes of initial environment * before the dynamic environment is available. @@ -237,68 +237,112 @@ done: * If len is zero, the caller is providing a pre-loaded buffer containing * environment strings. Additional strings cannot be added until the dynamic * environment is available. The memory pointed to must remain stable at least - * until sysinit runs init_dynamic_kenv(). If no initial environment is - * available from the boot loader, passing a NULL pointer allows the static_env - * to be installed if it is configured. + * until sysinit runs init_dynamic_kenv() and preferably until after SI_SUB_KMEM + * is finished so that subr_hints routines may continue to use it until the + * environments have been fully merged at the end of the pass. If no initial + * environment is available from the boot loader, passing a NULL pointer allows + * the static_env to be installed if it is configured. In this case, any call + * to kern_setenv() prior to the setup of the dynamic environment will result in + * a panic. */ void init_static_kenv(char *buf, size_t len) { - char *cp; - - for (cp = buf; cp != NULL && cp[0] != '\0'; cp += strlen(cp) + 1) { - if (strcmp(cp, "static_env.disabled=1") == 0) - envmode = 0; - if (strcmp(cp, "static_hints.disabled=1") == 0) - hintmode = 0; - } + char *eval; - if (envmode == 1) { + md_envp = buf; + md_env_len = len; + md_env_pos = 0; + + /* + * static_env and static_hints may both be disabled, but in slightly + * different ways. For static_env, we just don't setup kern_envp and + * it's as if a static env wasn't even provided. For static_hints, + * we effectively zero out the buffer to stop the rest of the kernel + * from being able to use it. + * + * We're intentionally setting this up so that static_hints.disabled may + * be specified in either the MD env or the static env. This keeps us + * consistent in our new world view. + */ + eval = kern_getenv("static_env.disabled"); + if (eval == NULL || strcmp(eval, "1") != 0) kern_envp = static_env; - env_len = len; - env_pos = len; - } else { - kern_envp = buf; - env_len = len; - env_pos = 0; - } + eval = kern_getenv("static_hints.disabled"); + if (eval != NULL && strcmp(eval, "1") == 0) + *static_hints = '\0'; } -/* - * Setup the dynamic kernel environment. - */ static void -init_dynamic_kenv(void *data __unused) +init_dynamic_kenv_from(char *init_env, int *curpos) { - char *cp, *cpnext; + char *cp, *cpnext, *eqpos, *found; size_t len; int i; - kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV, - M_WAITOK | M_ZERO); - i = 0; - if (kern_envp && *kern_envp != '\0') { - for (cp = kern_envp; cp != NULL; cp = cpnext) { + if (init_env && *init_env != '\0') { + found = NULL; + i = *curpos; + for (cp = init_env; cp != NULL; cp = cpnext) { cpnext = kernenv_next(cp); len = strlen(cp) + 1; if (len > KENV_MNAMELEN + 1 + KENV_MVALLEN + 1) { printf( "WARNING: too long kenv string, ignoring %s\n", cp); - continue; + goto sanitize; } - if (i < KENV_SIZE) { - kenvp[i] = malloc(len, M_KENV, M_WAITOK); - strcpy(kenvp[i++], cp); - explicit_bzero(cp, strlen(cp)); - } else + eqpos = strchr(cp, '='); + if (eqpos == NULL) { printf( + "WARNING: malformed static env value, ignoring %s\n", + cp); + goto sanitize; + } + *eqpos = 0; + /* + * De-dupe the environment as we go. We don't add the + * duplicated assignments because config(8) will flip + * the order of the static environment around to make + * kernel processing match the order of specification + * in the kernel config. + */ + found = _getenv_dynamic_locked(cp, NULL); + *eqpos = '='; + if (found != NULL) + goto sanitize; + if (i > KENV_SIZE) { + printf( "WARNING: too many kenv strings, ignoring %s\n", cp); + goto sanitize; + } + + kenvp[i] = malloc(len, M_KENV, M_WAITOK); + strcpy(kenvp[i++], cp); +sanitize: + explicit_bzero(cp, len - 1); } + *curpos = i; } - kenvp[i] = NULL; +} +/* + * Setup the dynamic kernel environment. + */ +static void +init_dynamic_kenv(void *data __unused) +{ + int dynamic_envpos; + + kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV, + M_WAITOK | M_ZERO); + + dynamic_envpos = 0; + init_dynamic_kenv_from(md_envp, &dynamic_envpos); + init_dynamic_kenv_from(kern_envp, &dynamic_envpos); + kenvp[dynamic_envpos] = NULL; + mtx_init(&kenv_lock, "kernel environment", NULL, MTX_DEF); dynamic_kenv = 1; } @@ -318,12 +362,11 @@ freeenv(char *env) * Internal functions for string lookup. */ static char * -_getenv_dynamic(const char *name, int *idx) +_getenv_dynamic_locked(const char *name, int *idx) { char *cp; int len, i; - mtx_assert(&kenv_lock, MA_OWNED); len = strlen(name); for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) { if ((strncmp(cp, name, len) == 0) && @@ -337,12 +380,20 @@ _getenv_dynamic(const char *name, int *idx) } static char * -_getenv_static(const char *name) +_getenv_dynamic(const char *name, int *idx) { + + mtx_assert(&kenv_lock, MA_OWNED); + return (_getenv_dynamic_locked(name, idx)); +} + +static char * +_getenv_static_from(char *chkenv, const char *name) +{ char *cp, *ep; int len; - for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) { + for (cp = chkenv; cp != NULL; cp = kernenv_next(cp)) { for (ep = cp; (*ep != '=') && (*ep != 0); ep++) ; if (*ep != '=') @@ -355,6 +406,20 @@ _getenv_static(const char *name) return (NULL); } +static char * +_getenv_static(const char *name) +{ + char *val; + + val = _getenv_static_from(md_envp, name); + if (val != NULL) + return (val); + val = _getenv_static_from(kern_envp, name); + if (val != NULL) + return (val); + return (NULL); +} + /* * Look up an environment variable by name. * Return a pointer to the string if found. @@ -399,20 +464,25 @@ testenv(const char *name) return (0); } +/* + * Set an environment variable in the MD-static environment. This cannot + * feasibly be done on config(8)-generated static environments as they don't + * generally include space for extra variables. + */ static int setenv_static(const char *name, const char *value) { int len; - if (env_pos >= env_len) + if (md_env_pos >= md_env_len) return (-1); /* Check space for x=y and two nuls */ len = strlen(name) + strlen(value); - if (len + 3 < env_len - env_pos) { - len = sprintf(&kern_envp[env_pos], "%s=%s", name, value); - env_pos += len+1; - kern_envp[env_pos] = '\0'; + if (len + 3 < md_env_len - md_env_pos) { + len = sprintf(&md_envp[md_env_pos], "%s=%s", name, value); + md_env_pos += len+1; + md_envp[md_env_pos] = '\0'; return (0); } else return (-1); @@ -428,7 +498,7 @@ kern_setenv(const char *name, const char *value) char *buf, *cp, *oldenv; int namelen, vallen, i; - if (dynamic_kenv == 0 && env_len > 0) + if (dynamic_kenv == 0 && md_env_len > 0) return (setenv_static(name, value)); KENV_CHECK; Modified: head/sys/kern/subr_hints.c ============================================================================== --- head/sys/kern/subr_hints.c Thu Jul 5 16:18:05 2018 (r335994) +++ head/sys/kern/subr_hints.c Thu Jul 5 16:25:48 2018 (r335995) @@ -31,61 +31,36 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/lock.h> +#include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mutex.h> #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/bus.h> -#define HINTMODE_KENV 0 -#define HINTMODE_STATIC 1 -#define HINTMODE_FALLBACK 2 +#define FBACK_MDENV 0 /* MD env (e.g. loader.conf) */ +#define FBACK_STENV 1 /* Static env */ +#define FBACK_STATIC 2 /* static_hints */ /* - * Access functions for device resources. + * We'll use hintenv_merged to indicate that the dynamic environment has been + * properly prepared for hint usage. This implies that the dynamic environment + * has already been setup (dynamic_kenv) and that we have added any supplied + * static_hints to the dynamic environment. */ +static int hintenv_merged; -static int checkmethod = 1; -static char *hintp; - /* - * Define kern.hintmode sysctl, which only accept value 2, that cause to - * switch from Static KENV mode to Dynamic KENV. So systems that have hints - * compiled into kernel will be able to see/modify KENV (and hints too). + * Access functions for device resources. */ -static int -sysctl_hintmode(SYSCTL_HANDLER_ARGS) +static void +static_hints_to_env(void *data __unused) { const char *cp; char *line, *eq; - int eqidx, error, i, value; + int eqidx, i; - value = hintmode; - - /* Fetch candidate for new hintmode value */ - error = sysctl_handle_int(oidp, &value, 0, req); - if (error || req->newptr == NULL) - return (error); - - if (value != HINTMODE_FALLBACK) - /* Only accept swithing to hintmode 2 */ - return (EINVAL); - - /* - * The rest of the sysctl handler is just making sure that our - * environment is consistent with the world we've already seen. - * If we came from kenv at all, then we have nothing to do: static - * kenv will get merged into dynamic kenv as soon as kmem becomes - * available, dynamic kenv is the environment we'd be setting these - * things in anyways. Therefore, we have nothing left to do unless - * we came from a static hints configuration. - */ - if (hintmode != HINTMODE_STATIC) { - hintmode = value; - return (0); - } - cp = static_hints; while (cp && *cp != '\0') { eq = strchr(cp, '='); @@ -95,103 +70,152 @@ sysctl_hintmode(SYSCTL_HANDLER_ARGS) eqidx = eq - cp; i = strlen(cp); - line = malloc(i+1, M_TEMP, M_WAITOK); + line = malloc(i + 1, M_TEMP, M_WAITOK); strcpy(line, cp); - line[eqidx] = '\0'; - kern_setenv(line, line + eqidx + 1); + line[eqidx] = line[i] = '\0'; + /* + * Before adding a hint to the dynamic environment, check if + * another value for said hint has already been added. This is + * needed because static environment overrides static hints and + * dynamic environment overrides all. + */ + if (testenv(line) == 0) + kern_setenv(line, line + eqidx + 1); free(line, M_TEMP); cp += i + 1; } - - hintmode = value; - return (0); + hintenv_merged = 1; } -SYSCTL_PROC(_kern, OID_AUTO, hintmode, CTLTYPE_INT|CTLFLAG_RW, - &hintmode, 0, sysctl_hintmode, "I", "Get/set current hintmode"); +/* Any time after dynamic env is setup */ +SYSINIT(hintenv, SI_SUB_KMEM, SI_ORDER_ANY, static_hints_to_env, NULL); /* + * Checks the environment to see if we even have any hints. If it has no hints, + * then res_find can take the hint that there's no point in searching it and + * either move on to the next environment or fail early. + */ +static bool +_res_checkenv(char *envp) +{ + char *cp; + + cp = envp; + while (cp) { + if (strncmp(cp, "hint.", 5) == 0) + return (true); + while (*cp != '\0') + cp++; + cp++; + if (*cp == '\0') + break; + } + return (false); +} + +/* * Evil wildcarding resource string lookup. * This walks the supplied env string table and returns a match. * The start point can be remembered for incremental searches. */ static int -res_find(int *line, int *startln, +res_find(char **hintp_cookie, int *line, int *startln, const char *name, int *unit, const char *resname, const char *value, const char **ret_name, int *ret_namelen, int *ret_unit, const char **ret_resname, int *ret_resnamelen, const char **ret_value) { - int n = 0, hit, i = 0; + int dyn_used = 0, fbacklvl = FBACK_MDENV, hit, i = 0, n = 0; char r_name[32]; - int r_unit, use_kenv = (hintmode != HINTMODE_STATIC && dynamic_kenv); + int r_unit; char r_resname[32]; char r_value[128]; const char *s, *cp; - char *p; + char *hintp, *p; - if (checkmethod) { - hintp = NULL; - switch (hintmode) { - case HINTMODE_KENV: /* loader hints in environment only */ - break; - case HINTMODE_STATIC: /* static hints only */ - hintp = static_hints; - checkmethod = 0; - break; - case HINTMODE_FALLBACK: /* fallback mode */ - if (dynamic_kenv) { - mtx_lock(&kenv_lock); - cp = kenvp[0]; - for (i = 0; cp != NULL; cp = kenvp[++i]) { - if (!strncmp(cp, "hint.", 5)) { - use_kenv = 1; - checkmethod = 0; - break; - } + /* + * We are expecting that the caller will pass us a hintp_cookie that + * they are tracking. Upon entry, if *hintp_cookie is *not* set, this + * indicates to us that we should be figuring out based on the current + * environment where to search. This keeps us sane throughout the + * entirety of a single search. + */ + if (*hintp_cookie == NULL) { + hintp = NULL; + if (hintenv_merged) { + /* + * static_hints, if it was previously used, has + * already been folded in to the environment + * by this point. + */ + mtx_lock(&kenv_lock); + cp = kenvp[0]; + for (i = 0; cp != NULL; cp = kenvp[++i]) { + if (!strncmp(cp, "hint.", 5)) { + hintp = kenvp[0]; + break; } - mtx_unlock(&kenv_lock); - } else { - cp = kern_envp; - while (cp) { - if (strncmp(cp, "hint.", 5) == 0) { - cp = NULL; - hintp = kern_envp; - break; - } - while (*cp != '\0') - cp++; - cp++; - if (*cp == '\0') { - cp = NULL; - hintp = static_hints; - break; - } - } } - break; - default: - break; - } - if (hintp == NULL) { - if (dynamic_kenv) { - use_kenv = 1; - checkmethod = 0; - } else + mtx_unlock(&kenv_lock); + dyn_used = 1; + } else { + /* + * We'll have a chance to keep coming back here until + * we've actually exhausted all of our possibilities. + * We might have chosen the MD/Static env because it + * had some kind of hints, but perhaps it didn't have + * the hint we are looking for. We don't provide any + * fallback when searching the dynamic environment. + */ +fallback: + if (dyn_used || fbacklvl >= FBACK_STATIC) + return (ENOENT); + + if (fbacklvl <= FBACK_MDENV && + _res_checkenv(md_envp)) { + hintp = md_envp; + goto found; + } + fbacklvl++; + + if (fbacklvl <= FBACK_STENV && + _res_checkenv(kern_envp)) { hintp = kern_envp; + goto found; + } + fbacklvl++; + + /* We'll fallback to static_hints if needed/can */ + if (fbacklvl <= FBACK_STATIC && + _res_checkenv(static_hints)) + hintp = static_hints; +found: + fbacklvl++; } + + if (hintp == NULL) + return (ENOENT); + *hintp_cookie = hintp; + } else { + hintp = *hintp_cookie; + if (hintenv_merged && hintp == kenvp[0]) + dyn_used = 1; + else + /* + * If we aren't using the dynamic environment, we need + * to run through the proper fallback procedure again. + * This is so that we do continuations right if we're + * working with *line and *startln. + */ + goto fallback; } - if (use_kenv) { + if (dyn_used) { mtx_lock(&kenv_lock); i = 0; - cp = kenvp[0]; - if (cp == NULL) { - mtx_unlock(&kenv_lock); - return (ENOENT); - } - } else - cp = hintp; + } + + cp = hintp; while (cp) { hit = 1; (*line)++; @@ -200,25 +224,28 @@ res_find(int *line, int *startln, else n = sscanf(cp, "hint.%32[^.].%d.%32[^=]=%127s", r_name, &r_unit, r_resname, r_value); - if (hit && n != 4) { - printf("CONFIG: invalid hint '%s'\n", cp); - p = strchr(cp, 'h'); - *p = 'H'; - hit = 0; + /* We'll circumvent all of the checks if we already know */ + if (hit) { + if (n != 4) { + printf("CONFIG: invalid hint '%s'\n", cp); + p = strchr(cp, 'h'); + *p = 'H'; + hit = 0; + } + if (hit && startln && *startln >= 0 && *line < *startln) + hit = 0; + if (hit && name && strcmp(name, r_name) != 0) + hit = 0; + if (hit && unit && *unit != r_unit) + hit = 0; + if (hit && resname && strcmp(resname, r_resname) != 0) + hit = 0; + if (hit && value && strcmp(value, r_value) != 0) + hit = 0; + if (hit) + break; } - if (hit && startln && *startln >= 0 && *line < *startln) - hit = 0; - if (hit && name && strcmp(name, r_name) != 0) - hit = 0; - if (hit && unit && *unit != r_unit) - hit = 0; - if (hit && resname && strcmp(resname, r_resname) != 0) - hit = 0; - if (hit && value && strcmp(value, r_value) != 0) - hit = 0; - if (hit) - break; - if (use_kenv) { + if (dyn_used) { cp = kenvp[++i]; if (cp == NULL) break; @@ -232,10 +259,10 @@ res_find(int *line, int *startln, } } } - if (use_kenv) + if (dyn_used) mtx_unlock(&kenv_lock); if (cp == NULL) - return ENOENT; + goto fallback; s = cp; /* This is a bit of a hack, but at least is reentrant */ @@ -273,11 +300,13 @@ resource_find(int *line, int *startln, { int i; int un; + char *hintp; *line = 0; + hintp = NULL; /* Search for exact unit matches first */ - i = res_find(line, startln, name, unit, resname, value, + i = res_find(&hintp, line, startln, name, unit, resname, value, ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen, ret_value); if (i == 0) @@ -286,7 +315,7 @@ resource_find(int *line, int *startln, return ENOENT; /* If we are still here, search for wildcard matches */ un = -1; - i = res_find(line, startln, name, &un, resname, value, + i = res_find(&hintp, line, startln, name, &un, resname, value, ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen, ret_value); if (i == 0) Modified: head/sys/kern/tty.c ============================================================================== --- head/sys/kern/tty.c Thu Jul 5 16:18:05 2018 (r335994) +++ head/sys/kern/tty.c Thu Jul 5 16:25:48 2018 (r335995) @@ -269,7 +269,7 @@ ttydev_open(struct cdev *dev, int oflags, int devtype struct thread *td) { struct tty *tp; - int error; + int cflags, error; tp = dev->si_drv1; error = 0; @@ -325,7 +325,14 @@ ttydev_open(struct cdev *dev, int oflags, int devtype if (TTY_CALLOUT(tp, dev) || dev == dev_console) tp->t_termios.c_cflag |= CLOCAL; - ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); + cflags = 0; + if (tp->t_termios.c_cflag & CDTR_IFLOW) + cflags |= SER_DTR; + if (tp->t_termios.c_cflag & CRTS_IFLOW) + cflags |= SER_RTS; + + if (cflags != 0) + ttydevsw_modem(tp, cflags, 0); error = ttydevsw_open(tp); if (error != 0) Modified: head/sys/sys/systm.h ============================================================================== --- head/sys/sys/systm.h Thu Jul 5 16:18:05 2018 (r335994) +++ head/sys/sys/systm.h Thu Jul 5 16:25:48 2018 (r335995) @@ -156,11 +156,10 @@ void kassert_panic(const char *fmt, ...) __printflike * XXX most of these variables should be const. */ extern int osreldate; -extern int envmode; -extern int hintmode; /* 0 = off. 1 = config, 2 = fallback */ extern int dynamic_kenv; extern struct mtx kenv_lock; extern char *kern_envp; +extern char *md_envp; extern char static_env[]; extern char static_hints[]; /* by config for now */ Modified: head/usr.sbin/config/config.5 ============================================================================== --- head/usr.sbin/config/config.5 Thu Jul 5 16:18:05 2018 (r335994) +++ head/usr.sbin/config/config.5 Thu Jul 5 16:25:48 2018 (r335995) @@ -23,7 +23,7 @@ .\" .\" $FreeBSD$ .\" -.Dd June 26, 2018 +.Dd July 5, 2018 .Dt CONFIG 5 .Os .Sh NAME @@ -114,13 +114,25 @@ are defined in the file .Pp .It Ic env Ar filename Specifies a filename containing a kernel environment definition. -The kernel normally uses an environment prepared for it at boot time -by +.Pp +The kernel will augment this compiled-in environment with the environment +prepared for it at boot time by .Xr loader 8 . -This directive makes the kernel ignore the boot environment and use -the compiled-in environment instead, unless the boot environment contains -.Va static_env.disabled=1 . +Environment variables specified in the +.Xr loader 8 +environment will take precedence over environment variables specified in +.Ar filename , +and environment variables specified in the dynamic environment take precedence +over both of these. .Pp +.Va static_env.disabled=1 +may be specified in the +.Xr loader 8 +environment to disable use of this compiled-in environment. +This option has no effect if specified in any environment after the +.Xr loader 8 +environment is processed. +.Pp This directive is useful for setting kernel tunables in embedded environments that do not start from .Xr loader 8 . @@ -172,9 +184,28 @@ time (see .Xr device.hints 5 ) . This directive configures the kernel to use the static device configuration listed in -.Ar filename , -unless the boot environment contains -.Va static_hints.disabled=1 . +.Ar filename . +.Pp +Hints provided in this static device configuration will be overwritten in the +order in which they're encountered. +Hints in the compiled-in environment takes precedence over compiled-in hints, +and hints in the environment prepared for the kernel by +.Xr loader 8 +takes precedence over hints in the compiled-in environment. +.Pp +Once the dynamic environment becomes available, all compiled-in hints will be +added to the dynamic environment if they do not already have an override in +the dynamic environment. +The dynamic environment will then be used for all searches of hints. +.Pp +.Va static_hints.disabled=1 +may be specified in either a compiled-in environment or the +.Xr loader 8 +environment to disable use of these hints files. +This option has no effect if specified in any environment after the +.Xr loader 8 +environment is processed. +.Pp The file .Ar filename must conform to the syntax specified by Modified: head/usr.sbin/config/config.h ============================================================================== --- head/usr.sbin/config/config.h Thu Jul 5 16:18:05 2018 (r335994) +++ head/usr.sbin/config/config.h Thu Jul 5 16:25:48 2018 (r335995) @@ -179,8 +179,6 @@ SLIST_HEAD(, includepath) includepath; extern char *ident; extern char kernconfstr[]; extern int do_trace; -extern int envmode; -extern int hintmode; extern int incignore; char *get_word(FILE *); Modified: head/usr.sbin/config/config.y ============================================================================== --- head/usr.sbin/config/config.y Thu Jul 5 16:18:05 2018 (r335994) +++ head/usr.sbin/config/config.y Thu Jul 5 16:25:48 2018 (r335995) @@ -82,8 +82,7 @@ struct device_head dtab; char *ident; -int envmode; -int hintmode; +char *env; int yyline; const char *yyfile; struct file_list_head ftab; @@ -201,7 +200,6 @@ Config_spec: err(EXIT_FAILURE, "calloc"); hint->hint_name = $2; STAILQ_INSERT_HEAD(&hints, hint, hint_next); - hintmode = 1; } System_spec: @@ -361,7 +359,6 @@ newenvvar(char *name, bool is_file) envvar->env_str = name; envvar->env_is_file = is_file; STAILQ_INSERT_HEAD(&envvars, envvar, envvar_next); - envmode = 1; } /* Modified: head/usr.sbin/config/mkmakefile.c ============================================================================== --- head/usr.sbin/config/mkmakefile.c Thu Jul 5 16:18:05 2018 (r335994) +++ head/usr.sbin/config/mkmakefile.c Thu Jul 5 16:25:48 2018 (r335995) @@ -197,7 +197,6 @@ makehints(void) fprintf(ofp, "#include <sys/types.h>\n"); fprintf(ofp, "#include <sys/systm.h>\n"); fprintf(ofp, "\n"); - fprintf(ofp, "int hintmode = %d;\n", hintmode); fprintf(ofp, "char static_hints[] = {\n"); STAILQ_FOREACH(hint, &hints, hint_next) { ifp = fopen(hint->hint_name, "r"); @@ -312,7 +311,6 @@ makeenv(void) fprintf(ofp, "#include <sys/types.h>\n"); fprintf(ofp, "#include <sys/systm.h>\n"); fprintf(ofp, "\n"); - fprintf(ofp, "int envmode = %d;\n", envmode); fprintf(ofp, "char static_env[] = {\n"); STAILQ_FOREACH(envvar, &envvars, envvar_next) { if (envvar->env_is_file) {
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