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config(8): De-dupe hint/env vars within a single file

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r335653 flipped the order in which hints/env files are concatenated to match
the order in which vars are processed by the kernel. This is the other
hammer to drop.

Use nv(9) to de-dupe entries within a single `hint` or `env` file, using the
latest value specified for a key. This leaves some duplicates if a variable
is specified in multiple hint/env files or via `envvar` in a kernel config,
but the reversed order of concatenation (from r335653) makes this a
non-issue as the latest-specified version will be seen first.

This change also silently rewrote hint bits to use the same sanitization
process that ian@ wrote for r335642. To the kernel, hints and env vars are
basically the same thing through early boot, then get merged into the
dynamic environment once kmem becomes available and the dynamic environment
is created. They should be subjected to the same restrictions.

MFC after:	1 month
This commit is contained in:
Kyle Evans 2018-07-05 17:53:51 +00:00
parent 945a6b310b
commit 51c854f028
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336011
2 changed files with 97 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
usr.sbin/config/Makefile
View File

@ -18,7 +18,7 @@ CFLAGS+= -I. -I${SRCDIR}
NO_WMISSING_VARIABLE_DECLARATIONS=
LIBADD= l sbuf
LIBADD= l nv sbuf
CLEANFILES+= kernconf.c

169
usr.sbin/config/mkmakefile.c
View File

@ -49,6 +49,8 @@ static const char rcsid[] =
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/cnv.h>
#include <sys/nv.h>
#include <sys/param.h>
#include "y.tab.h"
#include "config.h"
@ -62,6 +64,10 @@ static void do_objs(FILE *);
static void do_before_depend(FILE *);
static int opteq(const char *, const char *);
static void read_files(void);
static void sanitize_envline(char *result, const char *src);
static void process_into_file(char *line, FILE *ofp);
static void process_into_nvlist(char *line, nvlist_t *nvl);
static void dump_nvlist(nvlist_t *nvl, FILE *ofp);
static void errout(const char *fmt, ...)
{
@ -180,64 +186,6 @@ makefile(void)
moveifchanged(path("Makefile.new"), path("Makefile"));
}
/*
* Build hints.c from the skeleton
*/
void
makehints(void)
{
FILE *ifp, *ofp;
char line[BUFSIZ];
char *s;
struct hint *hint;
ofp = fopen(path("hints.c.new"), "w");
if (ofp == NULL)
err(1, "%s", path("hints.c.new"));
fprintf(ofp, "#include <sys/types.h>\n");
fprintf(ofp, "#include <sys/systm.h>\n");
fprintf(ofp, "\n");
fprintf(ofp, "char static_hints[] = {\n");
STAILQ_FOREACH(hint, &hints, hint_next) {
ifp = fopen(hint->hint_name, "r");
if (ifp == NULL)
err(1, "%s", hint->hint_name);
while (fgets(line, BUFSIZ, ifp) != NULL) {
/* zap trailing CR and/or LF */
while ((s = strrchr(line, '\n')) != NULL)
*s = '\0';
while ((s = strrchr(line, '\r')) != NULL)
*s = '\0';
/* remove # comments */
s = strchr(line, '#');
if (s)
*s = '\0';
/* remove any whitespace and " characters */
s = line;
while (*s) {
if (*s == ' ' || *s == '\t' || *s == '"') {
while (*s) {
s[0] = s[1];
s++;
}
/* start over */
s = line;
continue;
}
s++;
}
/* anything left? */
if (*line == '\0')
continue;
fprintf(ofp, "\"%s\\0\"\n", line);
}
fclose(ifp);
}
fprintf(ofp, "\"\\0\"\n};\n");
fclose(ofp);
moveifchanged(path("hints.c.new"), path("hints.c"));
}
static void
sanitize_envline(char *result, const char *src)
{
@ -295,6 +243,87 @@ sanitize_envline(char *result, const char *src)
*dst = 0;
}
static void
process_into_file(char *line, FILE *ofp)
{
char result[BUFSIZ];
sanitize_envline(result, line);
/* anything left? */
if (*result == '\0')
return;
fprintf(ofp, "\"%s\\0\"\n", result);
}
static void
process_into_nvlist(char *line, nvlist_t *nvl)
{
char result[BUFSIZ], *s;
sanitize_envline(result, line);
/* anything left? */
if (*result == '\0')
return;
s = strchr(result, '=');
*s = 0;
if (nvlist_exists(nvl, result))
nvlist_free(nvl, result);
nvlist_add_string(nvl, result, s + 1);
}
static void
dump_nvlist(nvlist_t *nvl, FILE *ofp)
{
const char *name;
void *cookie;
if (nvl == NULL)
return;
while (!nvlist_empty(nvl)) {
cookie = NULL;
name = nvlist_next(nvl, NULL, &cookie);
fprintf(ofp, "\"%s=%s\\0\"\n", name,
cnvlist_get_string(cookie));
cnvlist_free_string(nvl, cookie);
}
}
/*
* Build hints.c from the skeleton
*/
void
makehints(void)
{
FILE *ifp, *ofp;
nvlist_t *nvl;
char line[BUFSIZ];
struct hint *hint;
ofp = fopen(path("hints.c.new"), "w");
if (ofp == NULL)
err(1, "%s", path("hints.c.new"));
fprintf(ofp, "#include <sys/types.h>\n");
fprintf(ofp, "#include <sys/systm.h>\n");
fprintf(ofp, "\n");
fprintf(ofp, "char static_hints[] = {\n");
nvl = nvlist_create(0);
STAILQ_FOREACH(hint, &hints, hint_next) {
ifp = fopen(hint->hint_name, "r");
if (ifp == NULL)
err(1, "%s", hint->hint_name);
while (fgets(line, BUFSIZ, ifp) != NULL)
process_into_nvlist(line, nvl);
dump_nvlist(nvl, ofp);
fclose(ifp);
}
nvlist_destroy(nvl);
fprintf(ofp, "\"\\0\"\n};\n");
fclose(ofp);
moveifchanged(path("hints.c.new"), path("hints.c"));
}
/*
* Build env.c from the skeleton
*/
@ -302,7 +331,8 @@ void
makeenv(void)
{
FILE *ifp, *ofp;
char line[BUFSIZ], result[BUFSIZ], *linep;
nvlist_t *nvl;
char line[BUFSIZ];
struct envvar *envvar;
ofp = fopen(path("env.c.new"), "w");
@ -312,27 +342,20 @@ makeenv(void)
fprintf(ofp, "#include <sys/systm.h>\n");
fprintf(ofp, "\n");
fprintf(ofp, "char static_env[] = {\n");
nvl = nvlist_create(0);
STAILQ_FOREACH(envvar, &envvars, envvar_next) {
if (envvar->env_is_file) {
ifp = fopen(envvar->env_str, "r");
if (ifp == NULL)
err(1, "%s", envvar->env_str);
while (fgets(line, BUFSIZ, ifp) != NULL) {
sanitize_envline(result, line);
/* anything left? */
if (*result == '\0')
continue;
fprintf(ofp, "\"%s\\0\"\n", result);
}
while (fgets(line, BUFSIZ, ifp) != NULL)
process_into_nvlist(line, nvl);
dump_nvlist(nvl, ofp);
fclose(ifp);
} else {
linep = envvar->env_str;
sanitize_envline(result, linep);
if (*result == '\0')
continue;
fprintf(ofp, "\"%s\\0\"\n", result);
}
} else
process_into_file(envvar->env_str, ofp);
}
nvlist_destroy(nvl);
fprintf(ofp, "\"\\0\"\n};\n");
fclose(ofp);
moveifchanged(path("env.c.new"), path("env.c"));