git-branch, git-checkout: autosetup for remote branch tracking

In order to track and build on top of a branch 'topic' you track from
your upstream repository, you often would end up doing this sequence:

  git checkout -b mytopic origin/topic
  git config --add branch.mytopic.remote origin
  git config --add branch.mytopic.merge refs/heads/topic

This would first fork your own 'mytopic' branch from the 'topic'
branch you track from the 'origin' repository; then it would set up two
configuration variables so that 'git pull' without parameters does the
right thing while you are on your own 'mytopic' branch.

This commit adds a --track option to git-branch, so that "git
branch --track mytopic origin/topic" performs the latter two actions
when creating your 'mytopic' branch.

If the configuration variable branch.autosetupmerge is set to true, you
do not have to pass the --track option explicitly; further patches in
this series allow setting the variable with a "git remote add" option.
The configuration variable is off by default, and there is a --no-track
option to countermand it even if the variable is set.

Signed-off-by: Paolo Bonzini  <bonzini@gnu.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 54 insertions, 11 deletions

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 5565c2703..75c000a96 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -47,17 +47,6 @@ test_expect_success \
 	 test ! -f .git/refs/heads/d/e/f &&
 	 test ! -f .git/logs/refs/heads/d/e/f'
 
-cat >expect <<EOF
-0000000000000000000000000000000000000000 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	checkout: Created from master
-EOF
-test_expect_success \
-    'git checkout -b g/h/i -l should create a branch and a log' \
-	'GIT_COMMITTER_DATE="2005-05-26 23:30" \
-     git-checkout -b g/h/i -l master &&
-	 test -f .git/refs/heads/g/h/i &&
-	 test -f .git/logs/refs/heads/g/h/i &&
-	 diff expect .git/logs/refs/heads/g/h/i'
-
 test_expect_success \
     'git branch j/k should work after branch j has been deleted' \
        'git-branch j &&
@@ -117,4 +106,58 @@ test_expect_failure \
      ln -s real-u .git/logs/refs/heads/u &&
      git-branch -m u v'
 
+test_expect_success 'test tracking setup via --track' \
+    'git-config remote.local.url . &&
+     git-config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
+     (git-show-ref -q refs/remotes/local/master || git-fetch local) &&
+     git-branch --track my1 local/master &&
+     test $(git-config branch.my1.remote) = local &&
+     test $(git-config branch.my1.merge) = refs/heads/master'
+
+test_expect_success 'test tracking setup (non-wildcard, matching)' \
+    'git-config remote.local.url . &&
+     git-config remote.local.fetch refs/heads/master:refs/remotes/local/master &&
+     (git-show-ref -q refs/remotes/local/master || git-fetch local) &&
+     git-branch --track my4 local/master &&
+     test $(git-config branch.my4.remote) = local &&
+     test $(git-config branch.my4.merge) = refs/heads/master'
+
+test_expect_success 'test tracking setup (non-wildcard, not matching)' \
+    'git-config remote.local.url . &&
+     git-config remote.local.fetch refs/heads/s:refs/remotes/local/s &&
+     (git-show-ref -q refs/remotes/local/master || git-fetch local) &&
+     git-branch --track my5 local/master &&
+     ! test $(git-config branch.my5.remote) = local &&
+     ! test $(git-config branch.my5.merge) = refs/heads/master'
+
+test_expect_success 'test tracking setup via config' \
+    'git-config branch.autosetupmerge true &&
+     git-config remote.local.url . &&
+     git-config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
+     (git-show-ref -q refs/remotes/local/master || git-fetch local) &&
+     git-branch my3 local/master &&
+     test $(git-config branch.my3.remote) = local &&
+     test $(git-config branch.my3.merge) = refs/heads/master'
+
+test_expect_success 'test overriding tracking setup via --no-track' \
+    'git-config branch.autosetupmerge true &&
+     git-config remote.local.url . &&
+     git-config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
+     (git-show-ref -q refs/remotes/local/master || git-fetch local) &&
+     git-branch --no-track my2 local/master &&
+     ! test $(git-config branch.my2.remote) = local &&
+     ! test $(git-config branch.my2.merge) = refs/heads/master'
+
+# Keep this test last, as it changes the current branch
+cat >expect <<EOF
+0000000000000000000000000000000000000000 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	branch: Created from master
+EOF
+test_expect_success \
+    'git checkout -b g/h/i -l should create a branch and a log' \
+	'GIT_COMMITTER_DATE="2005-05-26 23:30" \
+     git-checkout -b g/h/i -l master &&
+	 test -f .git/refs/heads/g/h/i &&
+	 test -f .git/logs/refs/heads/g/h/i &&
+	 diff expect .git/logs/refs/heads/g/h/i'
+
 test_done