Linux standalone: Improved process names of linker shimmed programs.

Build/LinuxMkLibs.hs

@@ -44,31 +44,40 @@ mklibs top = do
 	-- Various files used by runshell to set up env vars used by the
 	-- linker shims.
 	writeFile (top </> "libdirs") (unlines libdirs)
-	writeFile (top </> "linker")
-		(Prelude.head $ filter ("ld-linux" `isInfixOf`) libs')
 	writeFile (top </> "gconvdir")
 		(parentDir $ Prelude.head $ filter ("/gconv/" `isInfixOf`) glibclibs)
 	
-	mapM_ (installLinkerShim top) exes
+	let linker = Prelude.head $ filter ("ld-linux" `isInfixOf`) libs'
+	mapM_ (installLinkerShim top linker) exes
 
 {- Installs a linker shim script around a binary.
  -
  - Note that each binary is put into its own separate directory,
  - to avoid eg git looking for binaries in its directory rather
- - than in PATH.-}
-installLinkerShim :: FilePath -> FilePath -> IO ()
-installLinkerShim top exe = do
-	createDirectoryIfMissing True shimdir
+ - than in PATH.
+ -
+ - The linker is symlinked to a file with the same basename as the binary,
+ - since that looks better in ps than "ld-linux.so".
+ -}
+installLinkerShim :: FilePath -> FilePath -> FilePath -> IO ()
+installLinkerShim top linker exe = do
+	createDirectoryIfMissing True (top </> shimdir)
+	createDirectoryIfMissing True (top </> exedir)
 	renameFile exe exedest
+	link <- relPathDirToFile (top </> exedir) (top ++ linker)
+	unlessM (doesFileExist (top </> exelink)) $
+		createSymbolicLink link (top </> exelink)
 	writeFile exe $ unlines
 		[ "#!/bin/sh"
-		, "exec \"$GIT_ANNEX_LINKER\" --library-path \"$GIT_ANNEX_LD_LIBRARY_PATH\" \"$GIT_ANNEX_SHIMMED/" ++ base ++ "/" ++ base ++ "\" \"$@\""
+		, "exec \"$GIT_ANNEX_DIR/" ++ exelink ++ "\" --library-path \"$GIT_ANNEX_LD_LIBRARY_PATH\" \"$GIT_ANNEX_DIR/shimmed/" ++ base ++ "/" ++ base ++ "\" \"$@\""
 		]
 	modifyFileMode exe $ addModes executeModes
   where
 	base = takeFileName exe
-	shimdir = top </> "shimmed" </> base
-	exedest = shimdir </> base
+	shimdir = "shimmed" </> base
+	exedir = "exe"
+	exedest = top </> shimdir </> base
+	exelink = exedir </> base
 
 {- Converting symlinks to hard links simplifies the binary shimming
  - process. -}

debian/changelog

@@ -31,6 +31,7 @@ git-annex (5.20150206) UNRELEASED; urgency=medium
   * sync, assistant: Use the ssh-options git config when doing git pull
     and push.
   * remotedaemon: Use the ssh-options git config.
+  * Linux standalone: Improved process names of linker shimmed programs.
 
  -- Joey Hess <id@joeyh.name>  Fri, 06 Feb 2015 13:57:08 -0400
 

doc/bugs/weird_entry_in_process_list.mdwn

@@ -37,3 +37,5 @@ root@koumbit-mp-test:/var/isuma/media/video# ps axf | grep annex
 """]]
 
 couldn't it alter its process name to make this a little more intuitive? This is especially problematic because i am trying to hook git-annex into Puppet and Facter, which require me to guess where the various git-annex repos are on the server. The way i was doing that so far was with `lsof -c 'git-annex' -F0tn`, which is obviously failing under those circumstances.... Unless there's a better way to find those repos across the system? I assume there's a git-annex assistant running here... --[[anarcat]]
+
+> [[fixed|done]] --[[Joey]]

doc/bugs/weird_entry_in_process_list/comment_1_61e1fc604b49964ef97f31c9d5546afc._comment

@@ -0,0 +1,13 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2015-02-16T23:35:08Z"
+ content="""
+Haskell programs actually cannot alter their process name. I've had a bug
+open on ghc for a year about that.
+
+However, I can make a nicer symlink name than ld-linux.so, and use that,
+and it will then be clear what program is being run, although the
+parameters to it will still be unusual due to the shimming used in the
+standalone build.
+"""]]

standalone/linux/skel/runshell

@@ -66,10 +66,8 @@ for lib in $(cat $base/libdirs); do
 	GIT_ANNEX_LD_LIBRARY_PATH="$base/$lib:$GIT_ANNEX_LD_LIBRARY_PATH"
 done
 export GIT_ANNEX_LD_LIBRARY_PATH
-GIT_ANNEX_LINKER="$base/$(cat $base/linker)"
-export GIT_ANNEX_LINKER
-GIT_ANNEX_SHIMMED="$base/shimmed"
-export GIT_ANNEX_SHIMMED
+GIT_ANNEX_DIR="$base"
+export GIT_ANNEX_DIR
 
 ORIG_GCONV_PATH="$GCONV_PATH"
 export ORIG_GCONV_PATH