classes/buildhistory: Add option to strip path prefix

Adds an option to strip a prefix from the paths reported in
buildhistory. This makes it easier to compare task signatures in the
build history when the builds were done from different directories.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 15 insertions, 3 deletions

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 059de36a5d..55b12d7893 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -43,6 +43,7 @@ BUILDHISTORY_COMMIT ?= "1"
 BUILDHISTORY_COMMIT_AUTHOR ?= "buildhistory <buildhistory@${DISTRO}>"
 BUILDHISTORY_PUSH_REPO ?= ""
 BUILDHISTORY_TAG ?= "build"
+BUILDHISTORY_PATH_PREFIX_STRIP ?= ""
 
 SSTATEPOSTINSTFUNCS_append = " buildhistory_emit_pkghistory"
 # We want to avoid influencing the signatures of sstate tasks - first the function itself:
@@ -697,7 +698,7 @@ python buildhistory_write_sigs() {
     if hasattr(bb.parse.siggen, 'dump_siglist'):
         taskoutdir = os.path.join(d.getVar('BUILDHISTORY_DIR'), 'task')
         bb.utils.mkdirhier(taskoutdir)
-        bb.parse.siggen.dump_siglist(os.path.join(taskoutdir, 'tasksigs.txt'))
+        bb.parse.siggen.dump_siglist(os.path.join(taskoutdir, 'tasksigs.txt'), d.getVar("BUILDHISTORY_PATH_PREFIX_STRIP"))
 }
 
 def buildhistory_get_build_id(d):
diff --git a/meta/lib/oe/sstatesig.py b/meta/lib/oe/sstatesig.py
index e86a09b332..47f3ca4efb 100644
--- a/meta/lib/oe/sstatesig.py
+++ b/meta/lib/oe/sstatesig.py
@@ -248,13 +248,24 @@ class SignatureGeneratorOEBasicHashMixIn(object):
                 f.write('    "\n')
             f.write('SIGGEN_LOCKEDSIGS_TYPES_%s = "%s"' % (self.machine, " ".join(l)))
 
-    def dump_siglist(self, sigfile):
+    def dump_siglist(self, sigfile, path_prefix_strip=None):
+        def strip_fn(fn):
+            nonlocal path_prefix_strip
+            if not path_prefix_strip:
+                return fn
+
+            fn_exp = fn.split(":")
+            if fn_exp[-1].startswith(path_prefix_strip):
+                fn_exp[-1] = fn_exp[-1][len(path_prefix_strip):]
+
+            return ":".join(fn_exp)
+
         with open(sigfile, "w") as f:
             tasks = []
             for taskitem in self.taskhash:
                 (fn, task) = taskitem.rsplit(":", 1)
                 pn = self.lockedpnmap[fn]
-                tasks.append((pn, task, fn, self.taskhash[taskitem]))
+                tasks.append((pn, task, strip_fn(fn), self.taskhash[taskitem]))
             for (pn, task, fn, taskhash) in sorted(tasks):
                 f.write('%s:%s %s %s\n' % (pn, task, fn, taskhash))