Fixed: SEGV when starting FCGI restconf program

- Reverted removal of CLICON_RESTCONF_PATH since it was used there
Misc fixes: initialized variables, docs, removed obsolete --enable-optyang

CHANGELOG.md

@@ -61,7 +61,6 @@ Users may have to change how they access the system
   * Imported (as a sub-spec):  clixon-clispec.yang
   * Removed obsolete options:
     * `CLICON_YANG_LIST_CHECK`
-    * `CLICON_RESTCONF_PATH` (moved to restconf/fcgi-path)
   * Fixed: Configure option `CLICON_RESTCONF_PRETTY` was marked as obsolete but was still used.
     * `CLICON_RESTCONF_PRETTY` is now obsolete for sure
     * Instead restconf/pretty is used with API function restconf_pretty_get()

apps/restconf/restconf_main_fcgi.c

@@ -211,7 +211,7 @@ main(int    argc,
     FCGX_Request   request;
     FCGX_Request  *req = &request;
     int            c;
-    char          *sockpath;
+    char          *sockpath = NULL;
     char          *path;
     clicon_handle  h;
     char          *dir;
@@ -523,6 +523,17 @@ main(int    argc,
 	clicon_err(OE_DAEMON, EFAULT, "Restconf daemon config not found or disabled");
 	goto done;
     }
+    /* XXX see restconf_config_init access directly */
+    if ((sockpath = clicon_option_str(h, "CLICON_RESTCONF_PATH")) == NULL){
+	clicon_err(OE_CFG, errno, "No CLICON_RESTCONF_PATH in clixon configure file");
+	goto done;
+    }
+    /* XXX CLICON_RESTCONF_PATH is marked as obsolete and should use 
+     *  fcgi-socket in clixon-restconf.yang instead */
+    if ((sockpath = clicon_option_str(h, "CLICON_RESTCONF_PATH")) == NULL){
+       clicon_err(OE_CFG, errno, "No CLICON_RESTCONF_PATH in clixon configure file");
+       goto done;
+    }
     if (FCGX_Init() != 0){ /* How to cleanup memory after this? */
 	clicon_err(OE_CFG, errno, "FCGX_Init");
 	goto done;

doc/DEVELOP.md

@@ -106,6 +106,13 @@ Use `/* */`. Use `//` only for temporal comments.
 
 Do not use "======", ">>>>>" or "<<<<<<" in comments since git merge conflict uses that.
 
+### Format ints
+
+Use:
+- %zu for size_t
+- PRIu64 for uint64
+- %p for pointers
+
 ## How to work in git
 
 Clixon uses semantic versioning (https://semver.org).

lib/clixon/clixon_handle.h

@@ -53,11 +53,8 @@ typedef void *clicon_handle;
 typedef void *plghndl_t;
 
 /*! Indirect output functions to print with something else than fprintf
- * @param[in]  h       Clicon handle 
- * @param[in]  xn      Request: <rpc><xn></rpc> 
- * @param[out] cbret   Return xml tree, eg <rpc-reply>..., <rpc-error.. 
- * @param[in]  arg     Domain specific arg, ec client-entry or FCGX_Request 
- * @param[in]  regarg  User argument given at rpc_callback_register() 
+ *
+ * @see man fprintf
  * @retval     0       OK
  * @retval    -1       Error
  */

test/cicd/clixon-config.sh

@@ -10,7 +10,7 @@ fi
 restconf=$1
 
 if [ $(uname) = "FreeBSD" ]; then
-    ./configure  --with-cligen=/usr/local --enable-optyangs --with-restconf=$restconf
+    ./configure  --with-cligen=/usr/local --with-restconf=$restconf
 else
-   ./configure --enable-optyangs --with-restconf=$restconf
+   ./configure --with-restconf=$restconf
 fi

test/vagrant/clixon.sh

@@ -63,10 +63,10 @@ cd src/clixon
 git pull origin master
 
 if [ $release = "freebsd" ]; then
-    LDFLAGS=-L/usr/local/lib ./configure --with-cligen=/usr/local --enable-optyangs --with-restconf=${with_restconf}
+    LDFLAGS=-L/usr/local/lib ./configure --with-cligen=/usr/local --with-restconf=${with_restconf}
 else
    # Problems with su not having "sbin" in path on centos when when we run tests later
-    ./configure --sbindir=/usr/sbin --libdir=/usr/lib --enable-optyangs --with-restconf=${with_restconf}
+    ./configure --sbindir=/usr/sbin --libdir=/usr/lib --with-restconf=${with_restconf}
 fi
 $MAKE clean
 $MAKE -j10

util/clixon_util_regexp.c

@@ -116,6 +116,7 @@ regex_posix(char *regexp,
 	fprintf(stderr, "pattern too long\n");
 	return -1;
     }
+    /* note following two lines trigger [-Wstringop-truncation] warnings, but see no actual error */
     strncpy(pattern, "^(", 2);
     strncpy(pattern+2, posix, sizeof(pattern)-2);
     strncat(pattern, ")$",  sizeof(pattern)-len0-1);

yang/clixon/clixon-config@2021-12-05.yang

@@ -53,7 +53,6 @@ module clixon-config {
                     clixon-clispec.yang
              Removed obsolete options:
                     CLICON_YANG_LIST_CHECK
-                    CLICON_RESTCONF_PATH
              Released in Clixon 5.5";
     }
     revision 2021-11-11 {
@@ -472,6 +471,16 @@ module clixon-config {
                  only loading from startup but may occur in other circumstances as well. This
                  means that sanity checks of erroneous XML/JSON may not be properly signalled.";
 	}
+	leaf CLICON_RESTCONF_PATH {
+	    type string;
+	    default "/www-data/fastcgi_restconf.sock";
+	    description
+		"FastCGI unix socket. Should be specified in webserver
+                Eg in nginx: fastcgi_pass unix:/www-data/clicon_restconf.sock
+                 Only if with-restconf=fcgi, NOT native
+                 Note: Obsolete, use fcgi-socket in clixon-restconf.yang instead";
+	    status obsolete;
+	}
 	leaf CLICON_BACKEND_DIR {
 	    type string;
 	    description