$ cat >> $HGRCPATH <<EOF

  > [extensions]

  > graphlog=

  > rebase=

  > 

  > [alias]

  > tglog = log -G --template "{rev}: '{desc}' {branches}\n"

  > EOF

  $ hg init a

  $ cd a

  $ echo C1 > C1

  $ hg ci -Am C1

  adding C1

  $ echo C2 > C2

  $ hg ci -Am C2

  adding C2

  $ cd ..

  $ hg clone a b

  updating to branch default

  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg clone a c

  updating to branch default

  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cd b

  $ echo L1 > L1

  $ hg ci -Am L1

  adding L1

  $ cd ../a

  $ echo R1 > R1

  $ hg ci -Am R1

  adding R1

  $ cd ../b

Now b has one revision to be pulled from a:

  $ hg pull --rebase

  pulling from */a (glob)

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files (+1 heads)

  saved backup bundle to */.hg/strip-backup/*-backup.hg (glob)

  $ hg tglog

  @  3: 'L1'

  |

  o  2: 'R1'

  |

  o  1: 'C2'

  |

  o  0: 'C1'

Re-run:

  $ hg pull --rebase

  pulling from */a (glob)

  searching for changes

  no changes found

Invoke pull --rebase and nothing to rebase:

  $ cd ../c

  $ hg pull --rebase

  pulling from */a (glob)

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  nothing to rebase

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg tglog -l 1

  @  2: 'R1'

  |

pull --rebase --update should ignore --update:

  $ hg pull --rebase --update

  pulling from */a (glob)

  searching for changes

  no changes found

pull --rebase doesn't update if nothing has been pulled:

  $ hg up -q 1

  $ hg pull --rebase

  pulling from */a (glob)

  searching for changes

  no changes found

  $ hg tglog -l 1

  o  2: 'R1'

  |