devel/libsoup: make samba a (not registered) runtime dep

This picks up an idea from PR 235207 again, where NTLM authentication
is optional. Previous commits made samba a build-dependency so
that the --enable-ntlm option would work. The meson build -- even
though the dep is entirely runtime -- would check for the presence
of ntlm_auth at build-time, to be able to pass in the path to
ntlm_auth to the build.

Re-jig this to not do the check, accept the option as-is, and
use a likely path to ntlm_auth instead (which is what the original
patch in 235207 did).

A circular dependency from samba41[23] -> libsoup and back
can be triggered by setting option SMB in libsoup and
option SPOTLIGHT in samba. Originally the runtime dependency
was registered as
	USES=	samba:run
A _RUN dependency still wants to build, though, and package and
index builds failed. Cut the circular dependency by **not**
registering samba as a runtime dependency and using a pkg-message
to tell users to possibly install samba.

Anyone who now has "but my samba is installed in a different prefix"
can file a PR with a patch fixing meson better.

PR:		256076
Reported by:	Dimitry Andric

3 files changed, 50 insertions, 8 deletions

diff --git a/devel/libsoup/Makefile b/devel/libsoup/Makefile
index ab65d9a4bc01..be036f740e3d 100644
--- a/devel/libsoup/Makefile
+++ b/devel/libsoup/Makefile
@@ -2,7 +2,7 @@
 
 PORTNAME=	libsoup
 PORTVERSION=	2.72.0
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	devel gnome
 MASTER_SITES=	GNOME
 DIST_SUBDIR=	gnome
@@ -18,14 +18,27 @@ LIB_DEPENDS=	libgcrypt.so:security/libgcrypt \
 		libpsl.so:dns/libpsl
 RUN_DEPENDS=	glib-networking>=2.29.18:net/glib-networking
 
-PORTSCOUT=	limitw:1,even
+USES=		gettext gnome localbase meson \
+		pkgconfig python:3.6+,build sqlite ssl tar:xz
+USE_GNOME=	glib20 intlhack introspection:build \
+		libxml2
+USE_LDCONFIG=	yes
 
 OPTIONS_DEFINE=			SMB
 OPTIONS_SINGLE=			GSSAPI
 OPTIONS_SINGLE_GSSAPI=		GSSAPI_BASE GSSAPI_HEIMDAL GSSAPI_MIT GSSAPI_NONE
 OPTIONS_DEFAULT=		SMB GSSAPI_${${SSL_DEFAULT} == base :?BASE :NONE}
 
-SMB_USES=			samba:build
+# Circular dependency samba -> tracker -> libsoup if the SPOTLIGHT
+# option is turned on in samba. Since samba is a **runtime** only
+# dependency, we can just tell it to be used. However, the Meson
+# build does a **build** time check for samba (even though the code does
+# a run-time check, too).
+#
+# Runtime deps still trigger a build / a dependency cycle, so as
+# a stopgap, patch it in, don't build anything, and inform the
+# user via pkg-message.
+# SMB_USES=			samba:run
 SMB_MESON_ENABLED=		ntlm
 
 GSSAPI_BASE_USES=		gssapi
@@ -39,11 +52,6 @@ GSSAPI_MIT_MESON_ON=		-Dgssapi=enabled -Dkrb5_config=${KRB5CONFIG}
 
 GSSAPI_NONE_MESON_DISABLED=	gssapi
 
-USES=		gettext gnome localbase meson \
-		pkgconfig python:3.6+,build sqlite ssl tar:xz
-USE_GNOME=	glib20 intlhack introspection:build \
-		libxml2
-USE_LDCONFIG=	yes
 MESON_ARGS=	-Dvapi=disabled \
 		-Dsysprof=disabled \
 		-Dtests=false \
@@ -53,4 +61,11 @@ MESON_ARGS=	-Dvapi=disabled \
 LIBVERSION=	1.11.0
 PLIST_SUB=	VERSION="2.4" LIBVERSION=${LIBVERSION}
 
+PORTSCOUT=	limitw:1,even
+
+post-patch:
+	${REINPLACE_CMD} \
+		-e 's+@@NTLM_AUTH@@+${LOCALBASE}/bin/ntlm_auth+' \
+		${WRKSRC}/meson.build
+
 .include <bsd.port.mk>
diff --git a/devel/libsoup/files/patch-meson.build b/devel/libsoup/files/patch-meson.build
new file mode 100644
index 000000000000..a5c6a02454bb
--- /dev/null
+++ b/devel/libsoup/files/patch-meson.build
@@ -0,0 +1,17 @@
+--- meson.build.orig	2021-06-12 13:43:16 UTC
++++ meson.build
+@@ -340,11 +340,11 @@ endif
+ ################
+ # NTLM not supported on Windows
+ if host_machine.system() != 'windows'
+-  ntlm_auth = find_program(get_option('ntlm_auth'), required: get_option('ntlm'))
++  # ntlm_auth = find_program(get_option('ntlm_auth'), required: get_option('ntlm'))
+ 
+-  if ntlm_auth.found()
++  if get_option('ntlm').enabled()
+     add_project_arguments('-DUSE_NTLM_AUTH=1', language : 'c')
+-    add_project_arguments('-DNTLM_AUTH="' + ntlm_auth.path() + '"', language : 'c')
++    add_project_arguments('-DNTLM_AUTH="@@NTLM_AUTH@@"', language : 'c')
+   endif
+ endif
+ 
diff --git a/devel/libsoup/pkg-message b/devel/libsoup/pkg-message
new file mode 100644
index 000000000000..3b9b3c2e1209
--- /dev/null
+++ b/devel/libsoup/pkg-message
@@ -0,0 +1,10 @@
+[
+{
+  type: install
+  message: <<EOM
+libsoup can use NTLM authentication if it is compiled
+with the SMB option. To use it, you must install a
+port that provides NTLM, like net/samba412 or net/samba413.
+EOM
+}
+]