[buildbot] phase1: support creating tags on demand

[LEDE Commits]

jow pushed a commit to buildbot.git, branch master:
https://git.lede-project.org/4c5fdcbcca6065a2a7a986f8cb3d956165295309

commit 4c5fdcbcca6065a2a7a986f8cb3d956165295309
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Mon Nov 28 19:36:18 2016 +0100

    phase1: support creating tags on demand
    
    If a build is forcibly invoked with a custom tag=x.y.z property, the builder
    will prepare and push the appropriate Git repository tag.
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 phase1/master.cfg | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/phase1/master.cfg b/phase1/master.cfg
index bbed054..f8b11df 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -174,6 +174,16 @@ def IsCleanRequested(pattern):
 
 	return CheckCleanProperty
 
+def IsTaggingRequested(step):
+	val = step.getProperty("tag")
+	if val and re.match("^[0-9]+\.[0-9]+\.[0-9]+$", val):
+		return True
+	else:
+		return False
+
+def IsNoTaggingRequested(step):
+	return not IsTaggingRequested(step)
+
 
 c['builders'] = []
 
@@ -273,6 +283,26 @@ for target in targets:
 			doStepIf = IsCleanRequested(tuple[0])
 		))
 
+	factory.addStep(MasterShellCommand(
+		name = "maketag",
+		description = "Tagging Git repository",
+		command = [home_dir+'/maketag.sh', '-i', '-k', str(gpg_keyid or ''),
+		           '-p', str(gpg_passfile or ''), '-v', WithProperties("%(tag:-)s")],
+		path = home_dir+'/source.git',
+		env = {'GNUPGHOME': gpg_home},
+		haltOnFailure = True,
+		doStepIf = IsTaggingRequested
+	))
+
+	# switch to branch
+	factory.addStep(ShellCommand(
+		name = "switchbranch",
+		description = "Checking out Git branch",
+		command = ["git", "checkout", repo_branch],
+		haltOnFailure = True,
+		doStepIf = IsNoTaggingRequested
+	))
+
 	# check out the source
 	factory.addStep(Git(
 		repourl = repo_url,
@@ -280,6 +310,24 @@ for target in targets:
 		mode = 'incremental',
 		method = 'clean'))
 
+	# fetch tags
+	factory.addStep(ShellCommand(
+		name = "fetchtag",
+		description = "Fetching Git tags",
+		command = ["git", "fetch", "--tags", "--", repo_url],
+		haltOnFailure = True,
+		doStepIf = IsTaggingRequested
+	))
+
+	# switch to tag
+	factory.addStep(ShellCommand(
+		name = "switchtag",
+		description = "Checking out Git tag",
+		command = ["git", "checkout", WithProperties("tags/v%(tag:-)s")],
+		haltOnFailure = True,
+		doStepIf = IsTaggingRequested
+	))
+
 	factory.addStep(ShellCommand(
 		name = "rmtmp",
 		description = "Remove tmp folder",