[gnome-continuous-yocto/gnomeostree-3.28-rocko: 2469/8267] bitbake: bitbake: fetch2: Make SRCREV_FORMAT name substitution safer

[Emmanuele Bassi <ebassi src gnome org>]

commit c3f630df52c3a278316fba89c92f90b5426c36d8
Author: Ulf Magnusson <ulfalizer gmail com>
Date:   Tue Sep 13 00:40:37 2016 +0200

    bitbake: bitbake: fetch2: Make SRCREV_FORMAT name substitution safer
    
    The implementation of SRCREV_FORMAT has at least two issues:
    
     1. Given two names "foo" and "foobar" and SRCREV_FORMAT = "foo_foobar",
        "foo" might currently get substituted twice, and "foobar" not at
        all.
    
     2. If the revision substitued for some name happens to contain another
        name as a substring, then that substring might incorrectly get
        replaced.
    
    Fix both issues by sorting the names with the longest ones first and
    replacing all names at once with a regular expression. This was inspired
    by
    http://stackoverflow.com/questions/6116978/python-replace-multiple-strings.
    
    (Bitbake rev: 8e6a893cb7f13ea14051fc40c6c9baf41aa47fee)
    
    Signed-off-by: Ulf Magnusson <ulfalizer gmail com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 bitbake/lib/bb/fetch2/__init__.py |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 11c75cc..06f1eb4 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -761,6 +761,7 @@ def get_srcrev(d, method_name='sortable_revision'):
     if not format:
         raise FetchError("The SRCREV_FORMAT variable must be set when multiple SCMs are used.")
 
+    name_to_rev = {}
     seenautoinc = False
     for scm in scms:
         ud = urldata[scm]
@@ -769,7 +770,16 @@ def get_srcrev(d, method_name='sortable_revision'):
             seenautoinc = seenautoinc or autoinc
             if len(rev) > 10:
                 rev = rev[:10]
-            format = format.replace(name, rev)
+            name_to_rev[name] = rev
+    # Replace names by revisions in the SRCREV_FORMAT string. The approach used
+    # here can handle names being prefixes of other names and names appearing
+    # as substrings in revisions (in which case the name should not be
+    # expanded). The '|' regular expression operator tries matches from left to
+    # right, so we need to sort the names with the longest ones first.
+    names_descending_len = sorted(name_to_rev, key=len, reverse=True)
+    name_to_rev_re = "|".join(re.escape(name) for name in names_descending_len)
+    format = re.sub(name_to_rev_re, lambda match: name_to_rev[match.group(0)], format)
+
     if seenautoinc:
        format = "AUTOINC+" + format