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sysctl: ignore errors from lines starting with -

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The systemd sysctl ignores errors from preload files that start
with a hyphen.  This change brings the procps sysctl into line with
their change.

References:
    procps-ng/procps#138
    https://github.com/systemd/systemd/pull/13191
    https://github.com/systemd/systemd/pull/13141
This commit is contained in:
Craig Small 2019-09-21 15:50:53 +10:00
parent 4c4d8b2464
commit 7af88da373
2 changed files with 19 additions and 7 deletions
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20
sysctl.c
View File

@ -378,6 +378,7 @@ static int WriteSetting(const char *setting)
char *tmpname; char *tmpname;
char *outname; char *outname;
char *last_dot; char *last_dot;
bool ignore_failure;
FILE *fp; FILE *fp;
struct stat ts; struct stat ts;
@ -402,6 +403,10 @@ static int WriteSetting(const char *setting)
return -2; return -2;
} }
ignore_failure = name[0] == '-';
if (ignore_failure)
name++;
/* used to open the file */ /* used to open the file */
tmpname = xmalloc(equals - name + 1 + strlen(PROC_PATH)); tmpname = xmalloc(equals - name + 1 + strlen(PROC_PATH));
strcpy(tmpname, PROC_PATH); strcpy(tmpname, PROC_PATH);
@ -446,19 +451,22 @@ static int WriteSetting(const char *setting)
switch (errno) { switch (errno) {
case ENOENT: case ENOENT:
if (!IgnoreError) { if (!IgnoreError) {
xwarnx(_("\"%s\" is an unknown key"), outname); xwarnx(_("\"%s\" is an unknown key%s"), outname, (ignore_failure?_(", ignoring"):""));
rc = -1; if (!ignore_failure)
rc = -1;
} }
break; break;
case EPERM:
case EROFS:
case EACCES: case EACCES:
xwarnx(_("permission denied on key '%s'"), outname); xwarnx(_("permission denied on key \"%s\"%s"), outname, (ignore_failure?_(", ignoring"):""));
rc = -1;
break; break;
default: default:
xwarn(_("setting key \"%s\""), outname); xwarn(_("setting key \"%s\"%s"), outname, (ignore_failure?_(", ignoring"):""));
rc = -1;
break; break;
} }
if (!ignore_failure && errno != ENOENT)
rc = -1;
} else { } else {
rc = fprintf(fp, "%s\n", value); rc = fprintf(fp, "%s\n", value);
if (0 < rc) if (0 < rc)

6
sysctl.conf.5
View File

@ -6,7 +6,7 @@
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details." .\" GNU General Public License for more details."
.TH SYSCTL.CONF "5" "January 2012" "procps-ng" "File Formats" .TH SYSCTL.CONF "5" "2019-09-21" "procps-ng" "File Formats"
.SH NAME .SH NAME
sysctl.conf \- sysctl preload/configuration file sysctl.conf \- sysctl preload/configuration file
.SH DESCRIPTION .SH DESCRIPTION
@ -28,6 +28,10 @@ token = value
Note that blank lines are ignored, and whitespace before and after a token or Note that blank lines are ignored, and whitespace before and after a token or
value is ignored, although a value can contain whitespace within. Lines which value is ignored, although a value can contain whitespace within. Lines which
begin with a # or ; are considered comments and ignored. begin with a # or ; are considered comments and ignored.
If a line begins with a single \-, any attempts to set the value that fail will be
ignored.
.SH NOTES .SH NOTES
As the As the
.BR /etc/sysctl.conf .BR /etc/sysctl.conf