Grafts is a poor name for the list of merges. Let's call it merges

[invirt/scripts/git-migration.git] / git-migrate

diff --git a/git-migrate b/git-migrate
index b79053a..796f937 100755 (executable)
--- a/git-migrate
+++ b/git-migrate
@@ -44,16 +44,63 @@ def mergeHistory(old_pkg, new_pkg, n):
     subprocess.check_call(['git', 'push',
                            'file:///%s/%s.git' % (cwd, new_pkg),
                            'master:refs/heads/%s' % old_pkg],
-                          cwd=new_pkg)
+                          cwd='%s.git' % new_pkg)
+    
+    graft = []
+    p = subprocess.Popen(['git', 'rev-list',
+                          '--reverse',
+                          '--skip=%s' % n,
+                          'master'],
+                         cwd='%s.git' % new_pkg,
+                         stdout=subprocess.PIPE)
+    p.wait()
+    new_rev = p.stdout.read().split()[0]
+    graft.append(new_rev)
+    
+    # If n isn't 0, then n has a parent commit already that we
+    # shouldn't forget about.
+    if n != 0:
+        p = subprocess.Popen(['git', 'rev-parse',
+                              '%s^' % new_rev],
+                             cwd='%s.git' % new_pkg,
+                             stdout=subprocess.PIPE)
+        p.wait()
+        graft.append(p.stdout.read().strip())
+    
+    # And regardless, the HEAD of old_pkg should be a parent of
+    # new_pkg
+    p = subprocess.Popen(['git', 'rev-parse',
+                          'master'],
+                         cwd='%s.git' % old_pkg,
+                         stdout=subprocess.PIPE)
+    p.wait()
+    graft.append(p.stdout.read().strip())
+    
+    f = open('%s.git/info/grafts' % new_pkg, 'a')
+    
+    print >>f, ' '.join(graft)
 
 def mergeHistories():
-    for line in open('grafts'):
+    merges = []
+    for line in open('merges'):
         line = line.strip()
         if line[0] == '#' or line == '':
             continue
         
-        old_pkg, new_pkg, n = line.split()
-        mergeHistory(old_pkg, new_pkg, int(n))
+        merges.append(line.split())
+    
+    for merge in merges:
+        mergeHistory(*merge)
+    
+    for line in open('package-list'):
+        line = line.strip()
+        subprocess.check_call(['git', 'filter-branch',
+                               '--',
+                               '--all'],
+                              cwd='%s.git' % line)
+    
+    for merge in merges:
+        shutil.rmtree('%s.git' % merge[0])
 
 if __name__ == '__main__':
     try: