[PATCH] sstate: Add extra intercept functions

[Richard Purdie <richard.purdie@linuxfoundation.org>]

In some cases we do either need to add extra sstate manipulation
functions, or change the existing modification functions. This patch
parametrises them to SSTATECREATEFUNCS and SSTATEPOSTUNPACKFUNCS and
abstracts the "hardcoded path" functions into separate functions using
these new variables.

We may use this new functionality to improve binary relocating using
patchelf for example, this at least lets us have the hooks to be able to
experiment.

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

diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 3411fac..940b19e 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -32,8 +32,10 @@ BB_HASHFILENAME = "${SSTATE_EXTRAPATH} ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}"
 
 SSTATE_MANMACH ?= "${SSTATE_PKGARCH}"
 
-SSTATEPREINSTFUNCS ?= ""
-SSTATEPOSTINSTFUNCS ?= ""
+SSTATECREATEFUNCS = "sstate_hardcode_path"
+SSTATEPREINSTFUNCS = ""
+SSTATEPOSTUNPACKFUNCS = "sstate_hardcode_path_unpack"
+SSTATEPOSTINSTFUNCS = ""
 EXTRA_STAGING_FIXMES ?= ""
 
 # Specify dirs in which the shell function is executed and don't use ${B}
@@ -239,16 +241,32 @@ def sstate_installpkg(ss, d):
     d.setVar('SSTATE_INSTDIR', sstateinst)
     d.setVar('SSTATE_PKG', sstatepkg)
 
-    for preinst in (d.getVar('SSTATEPREINSTFUNCS', True) or '').split():
-        bb.build.exec_func(preinst, d)
+    for f in (d.getVar('SSTATEPREINSTFUNCS', True) or '').split() + ['sstate_unpack_package'] + (d.getVar('SSTATEPOSTUNPACKFUNCS', True) or '').split():
+        bb.build.exec_func(f, d)
 
-    bb.build.exec_func('sstate_unpack_package', d)
+    for state in ss['dirs']:
+        prepdir(state[1])
+        os.rename(sstateinst + state[0], state[1])
+    sstate_install(ss, d)
 
+    for plain in ss['plaindirs']:
+        workdir = d.getVar('WORKDIR', True)
+        src = sstateinst + "/" + plain.replace(workdir, '')
+        dest = plain
+        bb.utils.mkdirhier(src)
+        prepdir(dest)
+        os.rename(src, dest)
+
+    return True
+
+python sstate_hardcode_path_unpack () {
     # Fixup hardcoded paths
     #
     # Note: The logic below must match the reverse logic in
     # sstate_hardcode_path(d)
+    import subprocess
 
+    sstateinst = d.getVar('SSTATE_INSTDIR', True)
     fixmefn =  sstateinst + "fixmepath"
     if os.path.isfile(fixmefn):
         staging = d.getVar('STAGING_DIR', True)
@@ -276,21 +294,7 @@ def sstate_installpkg(ss, d):
         # Need to remove this or we'd copy it into the target directory and may 
         # conflict with another writer
         os.remove(fixmefn)
-
-    for state in ss['dirs']:
-        prepdir(state[1])
-        os.rename(sstateinst + state[0], state[1])
-    sstate_install(ss, d)
-
-    for plain in ss['plaindirs']:
-        workdir = d.getVar('WORKDIR', True)
-        src = sstateinst + "/" + plain.replace(workdir, '')
-        dest = plain
-        bb.utils.mkdirhier(src)
-        prepdir(dest)
-        os.rename(src, dest)
-
-    return True
+}
 
 def sstate_clean_cachefile(ss, d):
     import oe.path
@@ -395,7 +399,7 @@ python sstate_cleanall() {
         sstate_clean(shared_state, ld)
 }
 
-def sstate_hardcode_path(d):
+python sstate_hardcode_path () {
     import subprocess, platform
 
     # Need to remove hardcoded paths and fix these when we install the
@@ -449,6 +453,7 @@ def sstate_hardcode_path(d):
     else:
         bb.note("Replacing absolute paths in fixmepath file: '%s'" % (sstate_filelist_relative_cmd))
         subprocess.call(sstate_filelist_relative_cmd, shell=True)
+}
 
 def sstate_package(ss, d):
     import oe.path
@@ -506,9 +511,10 @@ def sstate_package(ss, d):
 
     d.setVar('SSTATE_BUILDDIR', sstatebuild)
     d.setVar('SSTATE_PKG', sstatepkg)
-    sstate_hardcode_path(d)
-    bb.build.exec_func('sstate_create_package', d)
-    
+
+    for f in (d.getVar('SSTATECREATEFUNCS', True) or '').split() + ['sstate_create_package']:
+        bb.build.exec_func(f, d)
+  
     bb.siggen.dump_this_task(sstatepkg + ".siginfo", d)
 
     return