Merge pull request #4539 from sayap/git-sha1

git: Always return the before/after revisions, even in check mode.

library/source_control/git

@@ -41,7 +41,8 @@ options:
         default: "HEAD"
         description:
             - What version of the repository to check out.  This can be the
-              git I(SHA), the literal string C(HEAD), a branch name, or a tag name.
+              full 40-character I(SHA-1) hash, the literal string C(HEAD), a
+              branch name, or a tag name.
     remote:
         required: false
         default: "origin"
@@ -107,7 +108,7 @@ import tempfile
 def get_version(git_path, dest):
     ''' samples the version of the git repo '''
     os.chdir(dest)
-    cmd = "%s show --abbrev-commit" % (git_path,)
+    cmd = "%s show" % (git_path,)
     sha = os.popen(cmd).read().split("\n")
     sha = sha[0].split()[1]
     return sha
@@ -121,8 +122,9 @@ def clone(git_path, module, repo, dest, remote, depth, version):
         pass
     os.chdir(dest_dirname)
     cmd = [ git_path, 'clone', '-o', remote, '--recursive' ]
-    if version and version != 'HEAD':
-        cmd.extend([ '--branch', str(version) ])
+    if is_remote_branch(git_path, module, dest, repo, version) \
+    or is_remote_tag(git_path, module, dest, repo, version):
+        cmd.extend([ '--branch', version ])
     if depth:
         cmd.extend([ '--depth', str(depth) ])
     cmd.extend([ repo, dest ])
@@ -135,24 +137,30 @@ def has_local_mods(git_path, dest):
     lines = filter(lambda c: not re.search('^\\?\\?.*$', c), lines)
     return len(lines) > 0
 
-def reset(git_path, module, dest, force):
+def reset(git_path, module, dest):
     '''
     Resets the index and working tree to HEAD.
     Discards any changes to tracked files in working
     tree since that commit.
     '''
     os.chdir(dest)
-    if not force and has_local_mods(git_path, dest):
-        module.fail_json(msg="Local modifications exist in repository (force=no).")
     cmd = "%s reset --hard HEAD" % (git_path,)
     return module.run_command(cmd, check_rc=True)
 
 def get_remote_head(git_path, module, dest, version, remote):
-    cmd = ''
+    cloning = False
+    if remote == module.params['repo']:
+        cloning = True
+    else:
         os.chdir(dest)
     if version == 'HEAD':
-        version = get_head_branch(git_path, module, dest, remote)
-    if is_remote_branch(git_path, module, dest, remote, version):
+        if cloning:
+            # cloning the repo, just get the remote's HEAD version
+            cmd = '%s ls-remote %s -h HEAD' % (git_path, remote)
+        else:
+            head_branch = get_head_branch(git_path, module, dest, remote)
+            cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, head_branch)
+    elif is_remote_branch(git_path, module, dest, remote, version):
         cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, version)
     elif is_remote_tag(git_path, module, dest, remote, version):
         cmd = '%s ls-remote %s -t refs/tags/%s' % (git_path, remote, version)
@@ -167,9 +175,8 @@ def get_remote_head(git_path, module, dest, version, remote):
     return rev
 
 def is_remote_tag(git_path, module, dest, remote, version):
-    os.chdir(dest)
     cmd = '%s ls-remote %s -t refs/tags/%s' % (git_path, remote, version)
-    (rc, out, err) = module.run_command(cmd)
+    (rc, out, err) = module.run_command(cmd, check_rc=True)
     if version in out:
         return True
     else:
@@ -186,10 +193,10 @@ def get_branches(git_path, module, dest):
         branches.append(line.strip())
     return branches
 
-def is_remote_branch(git_path, module, dest, remote, branch):
-    branches = get_branches(git_path, module, dest)
-    rbranch = 'remotes/%s/%s' % (remote, branch)
-    if rbranch in branches:
+def is_remote_branch(git_path, module, dest, remote, version):
+    cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, version)
+    (rc, out, err) = module.run_command(cmd, check_rc=True)
+    if version in out:
         return True
     else:
         return False
@@ -335,8 +342,9 @@ def main():
     local_mods = False
     if not os.path.exists(gitconfig):
         if module.check_mode:
-            module.exit_json(changed=True)
-        (rc, out, err) = clone(git_path, module, repo, dest, remote, depth, version)
+            remote_head = get_remote_head(git_path, module, dest, version, repo)
+            module.exit_json(changed=True, before=before, after=remote_head)
+        clone(git_path, module, repo, dest, remote, depth, version)
     elif not update:
         # Just return having found a repo already in the dest path
         # this does no checking that the repo is the actual repo
@@ -347,44 +355,28 @@ def main():
         # else do a pull
         local_mods = has_local_mods(git_path, dest)
         before = get_version(git_path, dest)
-        # if force, do a reset
-        if local_mods and module.check_mode:
-            module.exit_json(changed=True, msg='Local modifications exist')
-        (rc, out, err) = reset(git_path, module, dest, force)
-        if rc != 0:
-            module.fail_json(msg=err)
-        # exit if already at desired sha version
-        # abbreviate version in case full sha is given
-        if before == str(version)[:7]:
-            module.exit_json(changed=False)
-        # check or get changes from remote
         remote_head = get_remote_head(git_path, module, dest, version, remote)
-        if module.check_mode:
-            changed = False
-            if remote_head == version:
-                # get_remote_head returned version as-is
-                # were given a sha1 object, see if it is present
-                (rc, out, err) = module.run_command("%s show %s" % (git_path, version))
-                if version in out:
-                    changed = False
-                else:
-                    changed = True
-            else:
-                remote_head = remote_head[0:7]
-                if before != remote_head:
-                    changed = True
+        if local_mods:
+            # failure should happen regardless of check mode
+            if not force:
+                module.fail_json(msg="Local modifications exist in repository (force=no).")
+            # if force and in non-check mode, do a reset
+            if not module.check_mode:
+                reset(git_path, module, dest)
+        # exit if already at desired sha version
+        if before == remote_head:
+            if local_mods:
+                module.exit_json(changed=True, before=before, after=remote_head,
+                    msg="Local modifications exist")
             else:
-                    changed = False
-            module.exit_json(changed=changed, before=before, after=remote_head)
-        (rc, out, err) = fetch(git_path, module, repo, dest, version, remote)
-        if rc != 0:
-            module.fail_json(msg=err)
+                module.exit_json(changed=False, before=before, after=remote_head)
+        if module.check_mode:
+            module.exit_json(changed=True, before=before, after=remote_head)
+        fetch(git_path, module, repo, dest, version, remote)
 
     # switch to version specified regardless of whether
     # we cloned or pulled
-    (rc, out, err) = switch_version(git_path, module, dest, remote, version)
-    if rc != 0:
-        module.fail_json(msg=err)
+    switch_version(git_path, module, dest, remote, version)
 
     # determine if we changed anything
     after = get_version(git_path, dest)