bug#66027: [PATCH v3 3/3] etc: teams: Parse 'From' commit more leniently.

[Maxim Cournoyer]

When a Change-Id is used, patman prepends a Message-Id field on the first line
of the patch, which broke the assumption that the 'From $commit' line must
appear on the first line.

* etc/teams.scm.in (git-patch->commit-id): Loop each line of the file until a
match is found.  Update doc.

Change-Id: I20400f87469ffb761ffc82dd32e34cd06f619043
---

Changes in v3:
 - New commit

 etc/teams.scm.in | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/etc/teams.scm.in b/etc/teams.scm.in
index 55242caad1..703d76fe8d 100644
--- a/etc/teams.scm.in
+++ b/etc/teams.scm.in
@@ -770,13 +770,16 @@ (define (diff-revisions rev-start rev-end)
     files))
 
 (define (git-patch->commit-id file)
-  "Parse the commit ID from the first line of FILE, a patch produced with git."
+  "Parse the commit ID from FILE, a patch produced with git."
   (call-with-input-file file
     (lambda (port)
-      (let ((m (string-match "^From ([0-9a-f]{40})" (read-line port))))
-        (unless m
-          (error "invalid patch file:" file))
-        (match:substring m 1)))))
+      (let loop ((line (read-line port)))
+        (when (eof-object? line)
+          (error "could not find 'from' commit in patch" file))
+        (let ((m (string-match "^From ([0-9a-f]{40})" line)))
+          (if m
+           (match:substring m 1)
+           (loop (read-line port))))))))
 
 (define (git-patch->revisions file)
   "Return the start and end revisions of FILE, a patch file produced with git."
-- 
2.41.0