[PATCH] sstate/gcc: Fix shared workdir handling for siginfo files

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

For a shared workdir, any one of the fetch/unpack/patch tasks may run yet the 
PN and architecture fields in SSTATE_PKGSPEC may differ. This makes looking up
the appropriate siginfo file near impossible.

I've tried several different ways of resolving this and this is the neatest
solution I could find, its still rather ugly. I believe the usefulness of 
better sstate debugging outweighs the ugliness of the code.

This patch also changes the sstate_checkhashes() code to look for siginfo 
files rather than the actual sstate packages themselves. This means the
function can be used in other contexts to find info files for tasks that
may not have sstate data. It is assumed that sstate mirrors will have both
files available. This is done to allow bitbake to query whether tasks have
matching signatures in sstate directories or not.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 678d5e3..9df9ac2 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -10,6 +10,7 @@ def generate_sstatefn(spec, hash, d):
 
 SSTATE_PKGARCH    = "${PACKAGE_ARCH}"
 SSTATE_PKGSPEC    = "sstate-${PN}-${PACKAGE_ARCH}${TARGET_VENDOR}-${TARGET_OS}-${PV}-${PR}-${SSTATE_PKGARCH}-${SSTATE_VERSION}-"
+SSTATE_SWSPEC     = ""
 SSTATE_PKGNAME    = "${SSTATE_EXTRAPATH}${@generate_sstatefn(d.getVar('SSTATE_PKGSPEC', True), d.getVar('BB_TASKHASH', True), d)}"
 SSTATE_PKG        = "${SSTATE_DIR}/${SSTATE_PKGNAME}"
 SSTATE_EXTRAPATH   = ""
@@ -26,7 +27,7 @@ SSTATE_DUPWHITELIST += "${STAGING_ETCDIR_NATIVE}/sgml ${STAGING_DATADIR_NATIVE}/
 SSTATE_SCAN_FILES ?= "*.la *-config *_config"
 SSTATE_SCAN_CMD ?= 'find ${SSTATE_BUILDDIR} \( -name "${@"\" -o -name \"".join(d.getVar("SSTATE_SCAN_FILES", True).split())}" \) -type f'
 
-BB_HASHFILENAME = "${SSTATE_EXTRAPATH} ${SSTATE_PKGSPEC}"
+BB_HASHFILENAME = "${SSTATE_EXTRAPATH} ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}"
 
 SSTATE_MANMACH ?= "${SSTATE_PKGARCH}"
 
@@ -606,11 +607,28 @@ def sstate_checkhashes(sq_fn, sq_task, sq_hash, sq_hashfn, d):
         e = extra.split(":")
         mapping[e[0]] = e[1]
 
+    def getpathcomponents(task, d):
+        # Magic data from BB_HASHFILENAME
+        splithashfn = sq_hashfn[task].split(" ")
+        spec = splithashfn[1]
+        extrapath = splithashfn[0]
+
+        tname = sq_task[task][3:]
+        if sq_task[task] in mapping:
+            tname = mapping[sq_task[task]]
+
+        if tname in ["fetch", "unpack", "patch"] and splithashfn[2]:
+            spec = splithashfn[2]
+            extrapath = ""
+
+        return spec, extrapath, tname
+
+
     for task in range(len(sq_fn)):
-        spec = sq_hashfn[task].split(" ")[1]
-        extrapath = sq_hashfn[task].split(" ")[0]
 
-        sstatefile = d.expand("${SSTATE_DIR}/" + extrapath + generate_sstatefn(spec, sq_hash[task], d) + "_" + mapping[sq_task[task]] + ".tgz")
+        spec, extrapath, tname = getpathcomponents(task, d)
+
+        sstatefile = d.expand("${SSTATE_DIR}/" + extrapath + generate_sstatefn(spec, sq_hash[task], d) + "_" + tname + ".tgz.siginfo")
         if os.path.exists(sstatefile):
             bb.debug(2, "SState: Found valid sstate file %s" % sstatefile)
             ret.append(task)
@@ -639,9 +657,9 @@ def sstate_checkhashes(sq_fn, sq_task, sq_hash, sq_hashfn, d):
             if task in ret:
                 continue
 
-            spec = sq_hashfn[task].split(" ")[1]
-            extrapath = sq_hashfn[task].split(" ")[0]
-            sstatefile = d.expand(extrapath + generate_sstatefn(spec, sq_hash[task], d) + "_" + mapping[sq_task[task]] + ".tgz")
+            spec, extrapath, tname = getpathcomponents(task, d)
+
+            sstatefile = d.expand(extrapath + generate_sstatefn(spec, sq_hash[task], d) + "_" + tname + ".tgz.siginfo")
 
             srcuri = "file://" + sstatefile
             localdata.setVar('SRC_URI', srcuri)
@@ -743,6 +761,12 @@ python sstate_eventhandler() {
     spkg = d.getVar('SSTATE_PKG', True)
     if not spkg.endswith(".tgz"):
         taskname = d.getVar("BB_RUNTASK", True)[3:]
-        bb.siggen.dump_this_task(d.getVar('SSTATE_PKG', True) + '_' + taskname + ".tgz" ".siginfo", d)
+        spec = d.getVar('SSTATE_PKGSPEC', True)
+        swspec = d.getVar('SSTATE_SWSPEC', True)
+        if taskname in ["fetch", "unpack", "patch"] and swspec:
+            d.setVar("SSTATE_PKGSPEC", "${SSTATE_SWSPEC}")
+            d.setVar("SSTATE_EXTRAPATH", "")
+        sstatepkg = d.getVar('SSTATE_PKG', True)
+        bb.siggen.dump_this_task(sstatepkg + '_' + taskname + ".tgz" ".siginfo", d)
 }
 
diff --git a/meta/recipes-devtools/gcc/gcc-common.inc b/meta/recipes-devtools/gcc/gcc-common.inc
index 55c6185..e49d724 100644
--- a/meta/recipes-devtools/gcc/gcc-common.inc
+++ b/meta/recipes-devtools/gcc/gcc-common.inc
@@ -95,6 +95,7 @@ do_patch[stamp-base-clean] = "${SSCLEAN}"
 
 # SW means Shared Work directory
 SW = "${TMPDIR}/work-shared/gcc-${PV}-${PR}"
+SSTATE_SWSPEC = "sstate-gcc-${PV}-${PR}-${SSTATE_VERSION}-"
 WORKDIR_task-unpack = "${SW}"
 WORKDIR_task-patch = "${SW}"