patman: Support absolute and ~user-relative alias files

Python doesn't naturally support tilde (~) as a user-home marker in
paths, but git-config does. So we need to resolve it before continuing.

We also shouldn't blindly join the top-level tree with the aliasesfile
path, because it might be an absolute path.

This resolves warnings like the following:

  Warning: Cannot find alias file '/path/to/source/tree/~/.git-email'

Seen when git-config is like:

  $ git config sendemail.aliasesfile
  ~/.git-email

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Otavio Salvador <otavio@ossystems.com.br>

1 files changed, 8 insertions, 3 deletions

diff --git a/tools/patman/gitutil.py b/tools/patman/gitutil.py
index 5e4c1128dc..e1ef96df22 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -616,9 +616,14 @@ def GetAliasFile():
     """
     fname = command.OutputOneLine('git', 'config', 'sendemail.aliasesfile',
             raise_on_error=False)
-    if fname:
-        fname = os.path.join(GetTopLevel(), fname.strip())
-    return fname
+    if not fname:
+        return None
+
+    fname = os.path.expanduser(fname.strip())
+    if os.path.isabs(fname):
+        return fname
+
+    return os.path.join(GetTopLevel(), fname)
 
 def GetDefaultUserName():
     """Gets the user.name from .gitconfig file.