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module Propellor.Git.VerifiedBranch where
import Propellor.Base
import Propellor.Git
import Propellor.PrivData.Paths
import Utility.FileMode
{- To verify origin branch commit's signature, have to convince gpg
- to use our keyring.
- While running git log. Which has no way to pass options to gpg.
- Argh!
-}
verifyOriginBranch :: String -> IO Bool
verifyOriginBranch originbranch = do
let gpgconf = privDataDir </> "gpg.conf"
keyring <- privDataKeyring
writeFile gpgconf $ unlines
[ " keyring " ++ keyring
, "no-auto-check-trustdb"
]
-- gpg is picky about perms
modifyFileMode privDataDir (removeModes otherGroupModes)
s <- readProcessEnv "git" ["log", "-n", "1", "--format=%G?", originbranch]
(Just [("GNUPGHOME", privDataDir)])
nukeFile $ privDataDir </> "trustdb.gpg"
nukeFile $ privDataDir </> "pubring.gpg"
nukeFile $ privDataDir </> "gpg.conf"
return (s == "U\n" || s == "G\n")
-- Returns True if HEAD is changed by fetching and merging from origin.
fetchOrigin :: IO Bool
fetchOrigin = do
fetched <- actionMessage "Pull from central git repository" $
boolSystem "git" [Param "fetch"]
if fetched
then mergeOrigin
else return False
mergeOrigin :: IO Bool
mergeOrigin = do
branchref <- getCurrentBranch
let originbranch = "origin" </> branchref
oldsha <- getCurrentGitSha1 branchref
keyring <- privDataKeyring
whenM (doesFileExist keyring) $
ifM (verifyOriginBranch originbranch)
( do
putStrLn $ "git branch " ++ originbranch ++ " gpg signature verified; merging"
hFlush stdout
void $ boolSystem "git" [Param "merge", Param originbranch]
, warningMessage $ "git branch " ++ originbranch ++ " is not signed with a trusted gpg key; refusing to deploy it! (Running with previous configuration instead.)"
)
newsha <- getCurrentGitSha1 branchref
return $ oldsha /= newsha
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