[gnome-continuous-yocto/gnomeostree-3.28-rocko: 5594/8267] classes/buildhistory: save output file signatures for sstate tasks

[Emmanuele Bassi <ebassi src gnome org>]

commit 3df7ee4755653f3783a9eaa81b019abf6be7a29a
Author: Paul Eggleton <paul eggleton linux intel com>
Date:   Fri Apr 7 16:57:23 2017 +1200

    classes/buildhistory: save output file signatures for sstate tasks
    
    Save a file per task listing sha256sums for each file staged, i.e.
    the output of the task. Some caveats:
    
    1) This only covers sstate tasks since it uses SSTATEPOSTUNPACKFUNCS,
       however those are generally the most interesting in terms of output
       anyway.
    2) The signature is taken before applying any relocations, so any
       relocated files will actually have different signatures, but that's
       churn that you probably won't want to see here.
    3) At the moment if you run the same build twice without sstate you will
       very likely see changes in the output for certain tasks due to things
       like timestamps being present in the binary output. Fixing that is
       a general Linux ecosystem problem - see this page for our efforts to
       resolve it on our side:
         https://wiki.yoctoproject.org/wiki/Reproducible_Builds
    
    NOTE: you need to set your BUILDHISTORY_FEATURES value to include
    "task" to enable collection of these signatures as it is is disabled by
    default.
    
    (From OE-Core rev: ca5d1273432e20059ab66d721a9eb314a54e81e7)
    
    Signed-off-by: Paul Eggleton <paul eggleton linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/buildhistory.bbclass |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)
---
diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 4fc19a0..f543bb7 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -47,6 +47,11 @@ sstate_install[vardepsexclude] += "buildhistory_emit_pkghistory"
 # then the value added to SSTATEPOSTINSTFUNCS:
 SSTATEPOSTINSTFUNCS[vardepvalueexclude] .= "| buildhistory_emit_pkghistory"
 
+# Similarly for our function that gets the output signatures
+SSTATEPOSTUNPACKFUNCS_append = " buildhistory_emit_outputsigs"
+sstate_installpkgdir[vardepsexclude] += "buildhistory_emit_outputsigs"
+SSTATEPOSTUNPACKFUNCS[vardepvalueexclude] .= "| buildhistory_emit_outputsigs"
+
 # All items excepts those listed here will be removed from a recipe's
 # build history directory by buildhistory_emit_pkghistory(). This is
 # necessary because some of these items (package directories, files that
@@ -292,6 +297,29 @@ python buildhistory_emit_pkghistory() {
     bb.build.exec_func("buildhistory_list_pkg_files", d)
 }
 
+python buildhistory_emit_outputsigs() {
+    if not "task" in (d.getVar('BUILDHISTORY_FEATURES') or "").split():
+        return
+
+    taskoutdir = os.path.join(d.getVar('BUILDHISTORY_DIR'), 'task', 'output')
+    bb.utils.mkdirhier(taskoutdir)
+    currenttask = d.getVar('BB_CURRENTTASK')
+    pn = d.getVar('PN')
+    taskfile = os.path.join(taskoutdir, '%s.%s' % (pn, currenttask))
+
+    cwd = os.getcwd()
+    filesigs = {}
+    for root, _, files in os.walk(cwd):
+        for fname in files:
+            if fname == 'fixmepath':
+                continue
+            fullpath = os.path.join(root, fname)
+            filesigs[os.path.relpath(fullpath, cwd)] = bb.utils.sha256_file(fullpath)
+    with open(taskfile, 'w') as f:
+        for fpath, fsig in sorted(filesigs.items(), key=lambda item: item[0]):
+            f.write('%s %s\n' % (fpath, fsig))
+}
+
 
 def write_recipehistory(rcpinfo, d):
     bb.debug(2, "Writing recipe history")