From 61b3cf7c471d2f94eefcf6616c1204f32e641542 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <hausmann@kde.org>
Date: Thu, 1 Feb 2007 00:08:51 +0100
Subject: [PATCH] Started working on incremental imports from Perforce.

Try to find the last imported p4 change number from the git tags and try to pass the right parent for commits to git fast-import.

Signed-off-by: Simon Hausmann <hausmann@kde.org>
---
 contrib/fast-import/p4-fast-export.py | 37 +++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/contrib/fast-import/p4-fast-export.py b/contrib/fast-import/p4-fast-export.py
index 588554d672..da3eb35841 100755
--- a/contrib/fast-import/p4-fast-export.py
+++ b/contrib/fast-import/p4-fast-export.py
@@ -26,6 +26,8 @@
     print ""
     sys.exit(1)
 
+master = "refs/heads/p4"
+branch = "refs/heads/p4-import"
 prefix = sys.argv[1]
 changeRange = ""
 try:
@@ -70,6 +72,25 @@ def getUserMap():
     return users
 
 users = getUserMap()
+topMerge = ""
+
+incremental = 0
+# try incremental import
+if len(changeRange) == 0:
+    try:
+        sout, sin, serr = popen2.popen3("git-name-rev --tags `git-rev-parse %s`" % master)
+        output = sout.read()
+        tagIdx = output.index(" tags/p4/")
+        caretIdx = output.index("^")
+        revision = int(output[tagIdx + 9 : caretIdx]) + 1
+        changeRange = "@%s,#head" % revision
+        topMerge = os.popen("git-rev-parse %s" % master).read()[:-1]
+        incremental = 1
+    except:
+        pass
+
+if incremental == 0:
+    branch = master
 
 output = os.popen("p4 changes %s...%s" % (prefix, changeRange)).readlines()
 
@@ -80,6 +101,10 @@ def getUserMap():
 
 changes.reverse()
 
+if len(changes) == 0:
+    print "no changes to import!"
+    sys.exit(1)
+
 sys.stderr.write("\n")
 
 tz = - time.timezone / 36
@@ -97,7 +122,7 @@ def getUserMap():
     epoch = description["time"]
     author = description["user"]
 
-    gitStream.write("commit refs/heads/master\n")
+    gitStream.write("commit %s\n" % branch)
     committer = ""
     if author in users:
         committer = "%s %s %s" % (users[author], epoch, tz)
@@ -111,6 +136,10 @@ def getUserMap():
     gitStream.write("\n[ imported from %s; change %s ]\n" % (prefix, change))
     gitStream.write("EOT\n\n")
 
+    if len(topMerge) > 0:
+        gitStream.write("merge %s\n" % topMerge)
+        topMerge = ""
+
     fnum = 0
     while description.has_key("depotFile%s" % fnum):
         path = description["depotFile%s" % fnum]
@@ -143,7 +172,7 @@ def getUserMap():
     gitStream.write("\n")
 
     gitStream.write("tag p4/%s\n" % change)
-    gitStream.write("from refs/heads/master\n");
+    gitStream.write("from %s\n" % branch);
     gitStream.write("tagger %s\n" % committer);
     gitStream.write("data 0\n\n")
 
@@ -152,4 +181,8 @@ def getUserMap():
 gitOutput.close()
 gitError.close()
 
+if incremental == 1:
+    os.popen("git rebase p4-import p4")
+    os.popen("git branch -d p4-import")
+
 print ""