buildman: Try to guess the upstream commit
Buildman normally obtains the upstream commit by asking git. Provided that
the branch was created with 'git checkout -b <branch> <some_upstream>' then
this normally works.
When there is no upstream, we can try to guess one, by looking up through
the commits until we find a branch. Add a function to try this and print
a warning if buildman ends up relying on it.
Also update the documentation to match.
Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Wolfgang Denk <wd@denx.de>
diff --git a/tools/patman/gitutil.py b/tools/patman/gitutil.py
index b68df5d..34c6b04 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -61,6 +61,52 @@
patch_count = int(stdout)
return patch_count
+def NameRevision(commit_hash):
+ """Gets the revision name for a commit
+
+ Args:
+ commit_hash: Commit hash to look up
+
+ Return:
+ Name of revision, if any, else None
+ """
+ pipe = ['git', 'name-rev', commit_hash]
+ stdout = command.RunPipe([pipe], capture=True, oneline=True).stdout
+
+ # We expect a commit, a space, then a revision name
+ name = stdout.split(' ')[1].strip()
+ return name
+
+def GuessUpstream(git_dir, branch):
+ """Tries to guess the upstream for a branch
+
+ This lists out top commits on a branch and tries to find a suitable
+ upstream. It does this by looking for the first commit where
+ 'git name-rev' returns a plain branch name, with no ! or ^ modifiers.
+
+ Args:
+ git_dir: Git directory containing repo
+ branch: Name of branch
+
+ Returns:
+ Tuple:
+ Name of upstream branch (e.g. 'upstream/master') or None if none
+ Warning/error message, or None if none
+ """
+ pipe = [LogCmd(branch, git_dir=git_dir, oneline=True, count=100)]
+ result = command.RunPipe(pipe, capture=True, capture_stderr=True,
+ raise_on_error=False)
+ if result.return_code:
+ return None, "Branch '%s' not found" % branch
+ for line in result.stdout.splitlines()[1:]:
+ commit_hash = line.split(' ')[0]
+ name = NameRevision(commit_hash)
+ if '~' not in name and '^' not in name:
+ if name.startswith('remotes/'):
+ name = name[8:]
+ return name, "Guessing upstream as '%s'" % name
+ return None, "Cannot find a suitable upstream for branch '%s'" % branch
+
def GetUpstream(git_dir, branch):
"""Returns the name of the upstream for a branch
@@ -69,7 +115,9 @@
branch: Name of branch
Returns:
- Name of upstream branch (e.g. 'upstream/master') or None if none
+ Tuple:
+ Name of upstream branch (e.g. 'upstream/master') or None if none
+ Warning/error message, or None if none
"""
try:
remote = command.OutputOneLine('git', '--git-dir', git_dir, 'config',
@@ -77,13 +125,14 @@
merge = command.OutputOneLine('git', '--git-dir', git_dir, 'config',
'branch.%s.merge' % branch)
except:
- return None
+ upstream, msg = GuessUpstream(git_dir, branch)
+ return upstream, msg
if remote == '.':
return merge
elif remote and merge:
leaf = merge.split('/')[-1]
- return '%s/%s' % (remote, leaf)
+ return '%s/%s' % (remote, leaf), None
else:
raise ValueError, ("Cannot determine upstream branch for branch "
"'%s' remote='%s', merge='%s'" % (branch, remote, merge))
@@ -99,10 +148,11 @@
Expression in the form 'upstream..branch' which can be used to
access the commits. If the branch does not exist, returns None.
"""
- upstream = GetUpstream(git_dir, branch)
+ upstream, msg = GetUpstream(git_dir, branch)
if not upstream:
- return None
- return '%s%s..%s' % (upstream, '~' if include_upstream else '', branch)
+ return None, msg
+ rstr = '%s%s..%s' % (upstream, '~' if include_upstream else '', branch)
+ return rstr, msg
def CountCommitsInBranch(git_dir, branch, include_upstream=False):
"""Returns the number of commits in the given branch.
@@ -114,14 +164,14 @@
Number of patches that exist on top of the branch, or None if the
branch does not exist.
"""
- range_expr = GetRangeInBranch(git_dir, branch, include_upstream)
+ range_expr, msg = GetRangeInBranch(git_dir, branch, include_upstream)
if not range_expr:
- return None
+ return None, msg
pipe = [LogCmd(range_expr, git_dir=git_dir, oneline=True),
['wc', '-l']]
result = command.RunPipe(pipe, capture=True, oneline=True)
patch_count = int(result.stdout)
- return patch_count
+ return patch_count, msg
def CountCommits(commit_range):
"""Returns the number of commits in the given range.