bitbake.conf/base: Improve handling of SRCPV

If SRCPV is set, it can be expanded when SRC_URI doesn't support it
leading to errors. Avoid doing this by setting it only when it makes
sense.

This patch depends on the bitbake python expansion patch series.

[YCOTO #7772]

(From OE-Core rev: ce64da2b80f99c82d96513d8dfb5e572757b0cda)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/base.bbclass

@@ -549,6 +549,7 @@ python () {
                 elif pn in htincompatwl:
                     bb.note("INCLUDING " + pn + " as buildable despite INCOMPATIBLE_LICENSE because it has been whitelisted for HOSTTOOLS")
 
+    needsrcrev = False
     srcuri = d.getVar('SRC_URI', True)
     for uri in srcuri.split():
         (scheme, _ , path) = bb.fetch.decodeurl(uri)[:3]
@@ -559,14 +560,17 @@ python () {
 
         # Svn packages should DEPEND on subversion-native
         if scheme == "svn":
+            needsrcrev = True
             d.appendVarFlag('do_fetch', 'depends', ' subversion-native:do_populate_sysroot')
 
         # Git packages should DEPEND on git-native
         elif scheme == "git":
+            needsrcrev = True
             d.appendVarFlag('do_fetch', 'depends', ' git-native:do_populate_sysroot')
 
         # Mercurial packages should DEPEND on mercurial-native
         elif scheme == "hg":
+            needsrcrev = True
             d.appendVarFlag('do_fetch', 'depends', ' mercurial-native:do_populate_sysroot')
 
         # OSC packages should DEPEND on osc-native
@@ -593,6 +597,9 @@ python () {
         elif path.endswith('.src.rpm'):
             d.appendVarFlag('do_unpack', 'depends', ' file-native:do_populate_sysroot')
 
+    if needsrcrev:
+        d.setVar("SRCPV", "${@bb.fetch2.get_srcrev(d)}")
+
     set_packagetriplet(d)
 
     # 'multimachine' handling

meta/conf/bitbake.conf

@@ -610,7 +610,8 @@ FETCHCMD_hg = "/usr/bin/env hg"
 SRCDATE = "${DATE}"
 SRCREV ??= "INVALID"
 AUTOREV = "${@bb.fetch2.get_autorev(d)}"
-SRCPV = "${@bb.fetch2.get_srcrev(d)}"
+# Set Dynamically in base.bbclass
+# SRCPV = "${@bb.fetch2.get_srcrev(d)}"
 SRCPV[vardepvalue] = "${SRCPV}"
 
 SRC_URI = ""