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| -rw-r--r-- | classes/base.bbclass | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/classes/base.bbclass b/classes/base.bbclass index 11f6554d2d..9bcd2abb3c 100644 --- a/classes/base.bbclass +++ b/classes/base.bbclass @@ -10,6 +10,35 @@ def base_path_join(a, *p): path += '/' + b return path +def base_path_relative(src, dest): + """ Return a relative path from src to dest. + + >>> base_path_relative("/usr/bin", "/tmp/foo/bar") + ../../tmp/foo/bar + + >>> base_path_relative("/usr/bin", "/usr/lib") + ../lib + + >>> base_path_relative("/tmp", "/tmp/foo/bar") + foo/bar + """ + from os.path import sep, pardir, normpath, commonprefix + + destlist = normpath(dest).split(sep) + srclist = normpath(src).split(sep) + + # Find common section of the path + common = commonprefix([destlist, srclist]) + commonlen = len(common) + + # Climb back to the point where they differentiate + relpath = [ pardir ] * (len(srclist) - commonlen) + if commonlen < len(destlist): + # Add remaining portion + relpath += destlist[commonlen:] + + return sep.join(relpath) + # for MD5/SHA handling def base_chk_load_parser(config_path): import ConfigParser, os, bb |