sysctl: print dotted keys again

When the globbing update was put into sysctl, you could no longer
simply use the keys because one key could potentially be
multiple paths once the glob expansion occured.  Using the path
instead gave a unique output.

Except certain programs, such as salt, expected the output to use
the dotted path "kernel.hostname" and not "kernel/hostname".

We can no longer use the original key, so now for each path:
  Copy the path
  strip off /proc/
  convert all / to .

The sysctl testsuite was also updated to check for a few different
types of conversion failures.

References:
 commit 6389deca5bf667f5fab5912acde78ba8e0febbc7
 https://www.freelists.org/post/procps/some-procpsn4400-fixes,4
 https://repo.saltproject.io/

Signed-off-by: Craig Small <csmall@dropbear.xyz>

4 files changed, 44 insertions, 14 deletions

diff --git a/NEWS b/NEWS
index a0ac258..62fac07 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,14 @@
 procps-ng-NEXT
+<<<<<<< HEAD
+=======
+  * library
+    Re-add elogind support                                 merge #151
+  * ps: threads again display when -L is used with -q      issue #234
+  * ps: proper aix format string behavior was restored
+  * sysctl: print dotted keys again
+
+procps-ng-4.0.0
+>>>>>>> b159c198 (sysctl: print dotted keys again)
 ---------------
   * Rename pwait to pidwait
   * sysctl: Add support for systemd glob patterns          issue #191
diff --git a/sysctl.c b/sysctl.c
index d26cd11..3139152 100644
--- a/sysctl.c
+++ b/sysctl.c
@@ -152,7 +152,7 @@ static SysctlSetting *setting_new(
         strcat(path + proc_len, key+1);
     else
         strcat(path + proc_len, key);
-    /* change . to / */
+    /* change . to / for path */
     slashdot(path + proc_len, '.', '/');
 
     s = xmalloc(sizeof(SysctlSetting));
@@ -510,7 +510,8 @@ static int WriteSetting(
 
     int rc = EXIT_SUCCESS;
     FILE *fp;
-	struct stat ts;
+    struct stat ts;
+    char *dotted_key;
 
     if (!key || !path)
         return rc;
@@ -523,13 +524,22 @@ static int WriteSetting(
         return rc;
 	}
 
-	if ((ts.st_mode & S_IWUSR) == 0) {
-		xwarn(_("setting key \"%s\""), key);
+    /* Convert the globbed path into a dotted key */
+    if ( (dotted_key = strdup(path + strlen(PROC_PATH))) == NULL) {
+	xerrx(EXIT_FAILURE, _("strdup key"));
+	return EXIT_FAILURE;
+    }
+    slashdot(dotted_key, '/', '.');
+
+    if ((ts.st_mode & S_IWUSR) == 0) {
+        xwarn(_("setting key \"%s\""), dotted_key);
+	free(dotted_key);
         return rc;
 	}
 
-	if (S_ISDIR(ts.st_mode)) {
-		xwarn(_("setting key \"%s\""), key);
+    if (S_ISDIR(ts.st_mode)) {
+        xwarn(_("setting key \"%s\""), dotted_key);
+	free(dotted_key);
         return rc;
 	}
 
@@ -539,7 +549,7 @@ static int WriteSetting(
             case ENOENT:
                 if (!IgnoreError) {
                     xwarnx(_("\"%s\" is an unknown key%s"),
-                           key, (ignore_failure?_(", ignoring"):""));
+                           dotted_key, (ignore_failure?_(", ignoring"):""));
 				if (!ignore_failure)
 				    rc = EXIT_FAILURE;
 			}
@@ -548,11 +558,11 @@ static int WriteSetting(
             case EROFS:
             case EACCES:
                 xwarnx(_("permission denied on key \"%s\"%s"),
-                       key, (ignore_failure?_(", ignoring"):""));
+                       dotted_key, (ignore_failure?_(", ignoring"):""));
                 break;
             default:
                 xwarn(_("setting key \"%s\"%s"),
-                      key, (ignore_failure?_(", ignoring"):""));
+                      dotted_key, (ignore_failure?_(", ignoring"):""));
                 break;
             }
             if (!ignore_failure && errno != ENOENT)
@@ -561,7 +571,7 @@ static int WriteSetting(
 	    if (0 < fprintf(fp, "%s\n", value))
 		rc = EXIT_SUCCESS;
             if (close_stream(fp) != 0) {
-                xwarn(_("setting key \"%s\""), path);
+                xwarn(_("setting key \"%s\""), dotted_key);
                 return rc;
             }
         }
@@ -571,7 +581,7 @@ static int WriteSetting(
             printf("%s\n", value);
         } else {
             if (PrintName) {
-                printf("%s = %s\n", path, value);
+                printf("%s = %s\n", dotted_key, value);
             } else {
                 if (PrintNewline)
                     printf("%s\n", value);
@@ -580,6 +590,7 @@ static int WriteSetting(
             }
         }
     }
+    free(dotted_key);
     return rc;
 }
 
diff --git a/testsuite/sysctl.test/sysctl_write.exp b/testsuite/sysctl.test/sysctl_write.exp
index 5a74dec..ff4b4a2 100644
--- a/testsuite/sysctl.test/sysctl_write.exp
+++ b/testsuite/sysctl.test/sysctl_write.exp
@@ -3,11 +3,19 @@ set sysctl ${topdir}sysctl
 
 set test "sysctl write from command line"
 spawn $sysctl --dry-run kernel.hostname=procps-test
-expect_pass "$test" "/proc/sys/kernel/hostname = procps-test"
+expect_pass "$test" "kernel.hostname = procps-test"
+
+set test "sysctl write from command line using slash"
+spawn $sysctl --dry-run kernel/hostname=procps-test
+expect_pass "$test" "kernel.hostname = procps-test"
 
 set test "sysctl write from configuration file"
 spawn $sysctl --dry-run -f ${topdir}testsuite/sysctl_glob_test.conf
-expect_pass "$test" "/proc/sys/fs/protected_fifos = 2\\s+/proc/sys/fs/protected_symlinks = 2\\s+/proc/sys/fs/protected_hardlinks = 1"
+expect_pass "$test" "fs.protected_fifos = 2\\s+fs.protected_symlinks = 2\\s+fs.protected_hardlinks = 1"
+
+set test "sysctl write from file with slashes"
+spawn $sysctl --dry-run -f ${topdir}testsuite/sysctl_slash_test.conf
+expect_pass "$test" "kernel.hostname = procps-test"
 
 set hostname_file "/proc/sys/kernel/hostname"
 if {[file exists ${hostname_file}]} {
@@ -25,5 +33,5 @@ if {[file exists ${hostname_file}]} {
     expect_spawn_retval "$test" 0
   }
 } else {
-  unsupported "sysctl write: hostname file doe not exist"
+  unsupported "sysctl write: hostname file does not exist"
 }
diff --git a/testsuite/sysctl_slash_test.conf b/testsuite/sysctl_slash_test.conf
new file mode 100644
index 0000000..77e9b37
--- /dev/null
+++ b/testsuite/sysctl_slash_test.conf
@@ -0,0 +1 @@
+kernel/hostname = procps-test