doas: fix path in vidoas

By default (and securely), vidoas explicitly sets the PATH to only include
the bare minimum standard bin directories (under /, /usr, and /usr/local).
However, since macports installs in /opt/local, when vidoas gets to the stage
of validating the new configuration (using `doas -C`), it fails because doas
is not on the PATH. This adds a patch to update the PATH in vidoas so it can
succeed when installed via macports.

sysutils/doas/Portfile

@@ -5,7 +5,7 @@ PortGroup           codeberg 1.0
 PortGroup           makefile 1.0
 
 codeberg.setup      thejessesmith doas 6.3p13
-revision            1
+revision            2
 checksums           rmd160  7584ac777c09e07bbeb153f28be1f750963713a8 \
                     sha256  2cca9003856e92ec0a50b3e559b7f3132bf8293dc8302613933f8ed06c8c7fc5 \
                     size    34883
@@ -29,6 +29,12 @@ depends_build       port:bison
 
 build.env           "OPT=${configure.optflags}"
 
+patchfiles          vidoas-fix-path.diff
+
+post-patch {
+    reinplace "s|@PREFIX@|${prefix}|" ${worksrcpath}/vidoas
+}
+
 post-destroot {
     xinstall -m 0644 ${worksrcpath}/doas.conf.sample ${destroot}${prefix}/etc
     set docdir ${prefix}/share/doc/${subport}

sysutils/doas/files/vidoas-fix-path.diff

@@ -0,0 +1,21 @@
+--- vidoas.orig
++++ vidoas
+@@ -15,17 +15,17 @@
+ # TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ # PERFORMANCE OF THIS SOFTWARE.
+ 
+ # Edit a temporary copy of the doas.conf file and check it for syntax
+ # errors before installing it as the actual doas.conf file.
+ 
+ set -eu
+ 
+-PATH=/bin:/usr/bin:/usr/local/bin
++PATH=/bin:/usr/bin:/usr/local/bin:@PREFIX@/bin
+ export PATH
+ 
+ PROG="${0##*/}"
+ 
+ umask 022
+ 
+ DOAS_CONF=@DOAS_CONF@
+ doas_conf_mode="0600"