mercurial --> plain text --> mercurial

[Matt Mackall]

Alright, here's a pair of scripts that will do end-to-end:

diff -r bc142ee1522c contrib/dumprevlog
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/dumprevlog	Thu Mar 27 12:40:17 2008 -0500
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# Dump revlogs as raw data stream
+# $ find .hg/store/ -name "*.i" | xargs dumprevlog > repo.dump
+
+import sys
+from mercurial import revlog, node
+
+for f in sys.argv[1:]:
+    r = revlog.revlog(open, f)
+    print "file:", f
+    for i in xrange(r.count()):
+        n = r.node(i)
+        p = r.parents(n)
+        d = r.revision(n)
+        print "node:", node.hex(n)
+        print "linkrev:", r.linkrev(n)
+        print "parents:", node.hex(p[0]), node.hex(p[1])
+        print "length:", len(d)
+        print "-start-"
+        print d
+        print "-end-"
diff -r bc142ee1522c contrib/undumprevlog
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/undumprevlog	Thu Mar 27 12:40:17 2008 -0500
@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+# Undump a dump from dumprevlog
+# $ hg init
+# $ undumprevlog < repo.dump
+
+import sys
+from mercurial import revlog, node, util, transaction
+
+opener = util.opener('.', False)
+tr = transaction.transaction(sys.stderr.write, opener, "undump.journal")
+while 1:
+    l = sys.stdin.readline()
+    if not l:
+        break
+    if l.startswith("file:"):
+        f = l[6:-1]
+        r = revlog.revlog(opener, f)
+        print f
+    elif l.startswith("node:"):
+        n = node.bin(l[6:-1])
+    elif l.startswith("linkrev:"):
+        lr = int(l[9:-1])
+    elif l.startswith("parents:"):
+        p = l[9:-1].split()
+        p1 = node.bin(p[0])
+        p2 = node.bin(p[1])
+    elif l.startswith("length:"):
+        length = int(l[8:-1])
+        sys.stdin.readline() # start marker
+        d = sys.stdin.read(length)
+        sys.stdin.readline() # end marker
+        r.addrevision(d, tr, lr, p1, p2)
+
+tr.close()

Tested on the Mercurial repo.

ps: making this work on systems that have braindead notions about text
vs binary files is an exercise left to the reader

-- 
Mathematics is the supreme nostalgia of our time.