bitbake: fetch2: preserve current working directory

Fix the methods in all fetchers so they don't change
the current working directory of the calling process, which
could lead to "changed cwd" warnings from bitbake.

(Bitbake rev: 6aa78bf3bd1f75728209e2d01faef31cb8887333)

Signed-off-by: Matt Madison <matt@madison.systems>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

13 files changed, 101 insertions, 137 deletions

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 9054b2ec18..7a3eb3c5ab 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -779,7 +779,7 @@ def localpath(url, d):
     fetcher = bb.fetch2.Fetch([url], d)
     return fetcher.localpath(url)
 
-def runfetchcmd(cmd, d, quiet=False, cleanup=None, log=None):
+def runfetchcmd(cmd, d, quiet=False, cleanup=None, log=None, workdir=None):
     """
     Run cmd returning the command output
     Raise an error if interrupted or cmd fails
@@ -821,7 +821,7 @@ def runfetchcmd(cmd, d, quiet=False, cleanup=None, log=None):
     error_message = ""
 
     try:
-        (output, errors) = bb.process.run(cmd, log=log, shell=True, stderr=subprocess.PIPE)
+        (output, errors) = bb.process.run(cmd, log=log, shell=True, stderr=subprocess.PIPE, cwd=workdir)
         success = True
     except bb.process.NotFoundError as e:
         error_message = "Fetch command %s" % (e.command)
@@ -1436,17 +1436,11 @@ class FetchMethod(object):
         if not cmd:
             return
 
-        # Change to unpackdir before executing command
-        save_cwd = os.getcwd();
-        os.chdir(unpackdir)
-
         path = data.getVar('PATH', True)
         if path:
             cmd = "PATH=\"%s\" %s" % (path, cmd)
-        bb.note("Unpacking %s to %s/" % (file, os.getcwd()))
-        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True)
-
-        os.chdir(save_cwd)
+        bb.note("Unpacking %s to %s/" % (file, unpackdir))
+        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True, cwd=unpackdir)
 
         if ret != 0:
             raise UnpackError("Unpack command %s failed with return value %s" % (cmd, ret), urldata.url)
@@ -1559,6 +1553,8 @@ class Fetch(object):
         network = self.d.getVar("BB_NO_NETWORK", True)
         premirroronly = (self.d.getVar("BB_FETCH_PREMIRRORONLY", True) == "1")
 
+        save_cwd = os.getcwd()
+
         for u in urls:
             ud = self.ud[u]
             ud.setup_localpath(self.d)
@@ -1633,6 +1629,7 @@ class Fetch(object):
                 raise
 
             finally:
+                os.chdir(save_cwd)
                 if ud.lockfile:
                     bb.utils.unlockfile(lf)
 
@@ -1641,6 +1638,8 @@ class Fetch(object):
         Check all urls exist upstream
         """
 
+        save_cwd = os.getcwd()
+
         if not urls:
             urls = self.urls
 
@@ -1664,6 +1663,8 @@ class Fetch(object):
             if not ret:
                 raise FetchError("URL %s doesn't work" % u, u)
 
+        os.chdir(save_cwd)
+
     def unpack(self, root, urls=None):
         """
         Check all urls exist upstream
diff --git a/bitbake/lib/bb/fetch2/bzr.py b/bitbake/lib/bb/fetch2/bzr.py
index ce11ee7c20..72264afb5a 100644
--- a/bitbake/lib/bb/fetch2/bzr.py
+++ b/bitbake/lib/bb/fetch2/bzr.py
@@ -88,19 +88,15 @@ class Bzr(FetchMethod):
             bzrcmd = self._buildbzrcommand(ud, d, "update")
             logger.debug(1, "BZR Update %s", ud.url)
             bb.fetch2.check_network_access(d, bzrcmd, ud.url)
-            os.chdir(os.path.join (ud.pkgdir, os.path.basename(ud.path)))
-            runfetchcmd(bzrcmd, d)
+            runfetchcmd(bzrcmd, d, workdir=os.path.join(ud.pkgdir, os.path.basename(ud.path)))
         else:
             bb.utils.remove(os.path.join(ud.pkgdir, os.path.basename(ud.pkgdir)), True)
             bzrcmd = self._buildbzrcommand(ud, d, "fetch")
             bb.fetch2.check_network_access(d, bzrcmd, ud.url)
             logger.debug(1, "BZR Checkout %s", ud.url)
             bb.utils.mkdirhier(ud.pkgdir)
-            os.chdir(ud.pkgdir)
             logger.debug(1, "Running %s", bzrcmd)
-            runfetchcmd(bzrcmd, d)
-
-        os.chdir(ud.pkgdir)
+            runfetchcmd(bzrcmd, d, workdir=ud.pkgdir)
 
         scmdata = ud.parm.get("scmdata", "")
         if scmdata == "keep":
@@ -109,7 +105,8 @@ class Bzr(FetchMethod):
             tar_flags = "--exclude='.bzr' --exclude='.bzrtags'"
 
         # tar them up to a defined filename
-        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, os.path.basename(ud.pkgdir)), d, cleanup = [ud.localpath])
+        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, os.path.basename(ud.pkgdir)),
+                    d, cleanup=[ud.localpath], workdir=ud.pkgdir)
 
     def supports_srcrev(self):
         return True
diff --git a/bitbake/lib/bb/fetch2/clearcase.py b/bitbake/lib/bb/fetch2/clearcase.py
index ba83e7cb60..70e280a8dd 100644
--- a/bitbake/lib/bb/fetch2/clearcase.py
+++ b/bitbake/lib/bb/fetch2/clearcase.py
@@ -202,11 +202,10 @@ class ClearCase(FetchMethod):
 
     def _remove_view(self, ud, d):
         if os.path.exists(ud.viewdir):
-            os.chdir(ud.ccasedir)
             cmd = self._build_ccase_command(ud, 'rmview');
             logger.info("cleaning up [VOB=%s label=%s view=%s]", ud.vob, ud.label, ud.viewname)
             bb.fetch2.check_network_access(d, cmd, ud.url)
-            output = runfetchcmd(cmd, d)
+            output = runfetchcmd(cmd, d, workdir=ud.ccasedir)
             logger.info("rmview output: %s", output)
 
     def need_update(self, ud, d):
@@ -241,11 +240,10 @@ class ClearCase(FetchMethod):
                 raise e
 
         # Set configspec: Setting the configspec effectively fetches the files as defined in the configspec
-        os.chdir(ud.viewdir)
         cmd = self._build_ccase_command(ud, 'setcs');
         logger.info("fetching data [VOB=%s label=%s view=%s]", ud.vob, ud.label, ud.viewname)
         bb.fetch2.check_network_access(d, cmd, ud.url)
-        output = runfetchcmd(cmd, d)
+        output = runfetchcmd(cmd, d, workdir=ud.viewdir)
         logger.info("%s", output)
 
         # Copy the configspec to the viewdir so we have it in our source tarball later
diff --git a/bitbake/lib/bb/fetch2/cvs.py b/bitbake/lib/bb/fetch2/cvs.py
index 43a234f590..5ff70ba921 100644
--- a/bitbake/lib/bb/fetch2/cvs.py
+++ b/bitbake/lib/bb/fetch2/cvs.py
@@ -123,22 +123,23 @@ class Cvs(FetchMethod):
         pkg = d.getVar('PN', True)
         pkgdir = os.path.join(d.getVar('CVSDIR', True), pkg)
         moddir = os.path.join(pkgdir, localdir)
+        workdir = None
         if os.access(os.path.join(moddir, 'CVS'), os.R_OK):
             logger.info("Update " + ud.url)
             bb.fetch2.check_network_access(d, cvsupdatecmd, ud.url)
             # update sources there
-            os.chdir(moddir)
+            workdir = moddir
             cmd = cvsupdatecmd
         else:
             logger.info("Fetch " + ud.url)
             # check out sources there
             bb.utils.mkdirhier(pkgdir)
-            os.chdir(pkgdir)
+            workdir = pkgdir
             logger.debug(1, "Running %s", cvscmd)
             bb.fetch2.check_network_access(d, cvscmd, ud.url)
             cmd = cvscmd
 
-        runfetchcmd(cmd, d, cleanup = [moddir])
+        runfetchcmd(cmd, d, cleanup=[moddir], workdir=workdir)
 
         if not os.access(moddir, os.R_OK):
             raise FetchError("Directory %s was not readable despite sucessful fetch?!" % moddir, ud.url)
@@ -150,15 +151,15 @@ class Cvs(FetchMethod):
             tar_flags = "--exclude='CVS'"
 
         # tar them up to a defined filename
+        workdir = None
         if 'fullpath' in ud.parm:
-            os.chdir(pkgdir)
+            workdir = pkgdir
             cmd = "tar %s -czf %s %s" % (tar_flags, ud.localpath, localdir)
         else:
-            os.chdir(moddir)
-            os.chdir('..')
+            workdir = os.path.dirname(os.path.realpath(moddir))
             cmd = "tar %s -czf %s %s" % (tar_flags, ud.localpath, os.path.basename(moddir))
 
-        runfetchcmd(cmd, d, cleanup = [ud.localpath])
+        runfetchcmd(cmd, d, cleanup=[ud.localpath], workdir=workdir)
 
     def clean(self, ud, d):
         """ Clean CVS Files and tarballs """
diff --git a/bitbake/lib/bb/fetch2/git.py b/bitbake/lib/bb/fetch2/git.py
index fd8f3fdf4d..1bec60ab71 100644
--- a/bitbake/lib/bb/fetch2/git.py
+++ b/bitbake/lib/bb/fetch2/git.py
@@ -219,9 +219,8 @@ class Git(FetchMethod):
     def need_update(self, ud, d):
         if not os.path.exists(ud.clonedir):
             return True
-        os.chdir(ud.clonedir)
         for name in ud.names:
-            if not self._contains_ref(ud, d, name):
+            if not self._contains_ref(ud, d, name, ud.clonedir):
                 return True
         if ud.write_tarballs and not os.path.exists(ud.fullmirror):
             return True
@@ -242,8 +241,7 @@ class Git(FetchMethod):
         # If the checkout doesn't exist and the mirror tarball does, extract it
         if not os.path.exists(ud.clonedir) and os.path.exists(ud.fullmirror):
             bb.utils.mkdirhier(ud.clonedir)
-            os.chdir(ud.clonedir)
-            runfetchcmd("tar -xzf %s" % (ud.fullmirror), d)
+            runfetchcmd("tar -xzf %s" % (ud.fullmirror), d, workdir=ud.clonedir)
 
         repourl = self._get_repo_url(ud)
 
@@ -258,34 +256,32 @@ class Git(FetchMethod):
             progresshandler = GitProgressHandler(d)
             runfetchcmd(clone_cmd, d, log=progresshandler)
 
-        os.chdir(ud.clonedir)
         # Update the checkout if needed
         needupdate = False
         for name in ud.names:
-            if not self._contains_ref(ud, d, name):
+            if not self._contains_ref(ud, d, name, ud.clonedir):
                 needupdate = True
         if needupdate:
             try: 
-                runfetchcmd("%s remote rm origin" % ud.basecmd, d) 
+                runfetchcmd("%s remote rm origin" % ud.basecmd, d, workdir=ud.clonedir)
             except bb.fetch2.FetchError:
                 logger.debug(1, "No Origin")
 
-            runfetchcmd("%s remote add --mirror=fetch origin %s" % (ud.basecmd, repourl), d)
+            runfetchcmd("%s remote add --mirror=fetch origin %s" % (ud.basecmd, repourl), d, workdir=ud.clonedir)
             fetch_cmd = "LANG=C %s fetch -f --prune --progress %s refs/*:refs/*" % (ud.basecmd, repourl)
             if ud.proto.lower() != 'file':
                 bb.fetch2.check_network_access(d, fetch_cmd, ud.url)
             progresshandler = GitProgressHandler(d)
-            runfetchcmd(fetch_cmd, d, log=progresshandler)
-            runfetchcmd("%s prune-packed" % ud.basecmd, d)
-            runfetchcmd("%s pack-redundant --all | xargs -r rm" % ud.basecmd, d)
+            runfetchcmd(fetch_cmd, d, log=progresshandler, workdir=ud.clonedir)
+            runfetchcmd("%s prune-packed" % ud.basecmd, d, workdir=ud.clonedir)
+            runfetchcmd("%s pack-redundant --all | xargs -r rm" % ud.basecmd, d, workdir=ud.clonedir)
             try:
                 os.unlink(ud.fullmirror)
             except OSError as exc:
                 if exc.errno != errno.ENOENT:
                     raise
-        os.chdir(ud.clonedir)
         for name in ud.names:
-            if not self._contains_ref(ud, d, name):
+            if not self._contains_ref(ud, d, name, ud.clonedir):
                 raise bb.fetch2.FetchError("Unable to find revision %s in branch %s even from upstream" % (ud.revisions[name], ud.branches[name]))
 
     def build_mirror_data(self, ud, d):
@@ -295,10 +291,9 @@ class Git(FetchMethod):
             if os.path.islink(ud.fullmirror):
                 os.unlink(ud.fullmirror)
 
-            os.chdir(ud.clonedir)
             logger.info("Creating tarball of git repository")
-            runfetchcmd("tar -czf %s %s" % (ud.fullmirror, os.path.join(".") ), d)
-            runfetchcmd("touch %s.done" % (ud.fullmirror), d)
+            runfetchcmd("tar -czf %s %s" % (ud.fullmirror, os.path.join(".") ), d, workdir=ud.clonedir)
+            runfetchcmd("touch %s.done" % (ud.fullmirror), d, workdir=ud.clonedir)
 
     def unpack(self, ud, destdir, d):
         """ unpack the downloaded src to destdir"""
@@ -321,21 +316,21 @@ class Git(FetchMethod):
             cloneflags += " --mirror"
 
         runfetchcmd("%s clone %s %s/ %s" % (ud.basecmd, cloneflags, ud.clonedir, destdir), d)
-        os.chdir(destdir)
         repourl = self._get_repo_url(ud)
-        runfetchcmd("%s remote set-url origin %s" % (ud.basecmd, repourl), d)
+        runfetchcmd("%s remote set-url origin %s" % (ud.basecmd, repourl), d, workdir=destdir)
         if not ud.nocheckout:
             if subdir != "":
-                runfetchcmd("%s read-tree %s%s" % (ud.basecmd, ud.revisions[ud.names[0]], readpathspec), d)
-                runfetchcmd("%s checkout-index -q -f -a" % ud.basecmd, d)
+                runfetchcmd("%s read-tree %s%s" % (ud.basecmd, ud.revisions[ud.names[0]], readpathspec), d,
+                            workdir=destdir)
+                runfetchcmd("%s checkout-index -q -f -a" % ud.basecmd, d, workdir=destdir)
             elif not ud.nobranch:
                 branchname =  ud.branches[ud.names[0]]
                 runfetchcmd("%s checkout -B %s %s" % (ud.basecmd, branchname, \
-                            ud.revisions[ud.names[0]]), d)
+                            ud.revisions[ud.names[0]]), d, workdir=destdir)
                 runfetchcmd("%s branch --set-upstream %s origin/%s" % (ud.basecmd, branchname, \
-                            branchname), d)
+                            branchname), d, workdir=destdir)
             else:
-                runfetchcmd("%s checkout %s" % (ud.basecmd, ud.revisions[ud.names[0]]), d)
+                runfetchcmd("%s checkout %s" % (ud.basecmd, ud.revisions[ud.names[0]]), d, workdir=destdir)
 
         return True
 
@@ -349,7 +344,7 @@ class Git(FetchMethod):
     def supports_srcrev(self):
         return True
 
-    def _contains_ref(self, ud, d, name):
+    def _contains_ref(self, ud, d, name, wd):
         cmd = ""
         if ud.nobranch:
             cmd = "%s log --pretty=oneline -n 1 %s -- 2> /dev/null | wc -l" % (
@@ -358,7 +353,7 @@ class Git(FetchMethod):
             cmd =  "%s branch --contains %s --list %s 2> /dev/null | wc -l" % (
                 ud.basecmd, ud.revisions[name], ud.branches[name])
         try:
-            output = runfetchcmd(cmd, d, quiet=True)
+            output = runfetchcmd(cmd, d, quiet=True, workdir=wd)
         except bb.fetch2.FetchError:
             return False
         if len(output.split()) > 1:
diff --git a/bitbake/lib/bb/fetch2/gitannex.py b/bitbake/lib/bb/fetch2/gitannex.py
index e4527f1c75..4937a10891 100644
--- a/bitbake/lib/bb/fetch2/gitannex.py
+++ b/bitbake/lib/bb/fetch2/gitannex.py
@@ -34,43 +34,42 @@ class GitANNEX(Git):
         """
         return ud.type in ['gitannex']
 
-    def uses_annex(self, ud, d):
+    def uses_annex(self, ud, d, wd):
         for name in ud.names:
             try:
-                runfetchcmd("%s rev-list git-annex" % (ud.basecmd), d, quiet=True)
+                runfetchcmd("%s rev-list git-annex" % (ud.basecmd), d, quiet=True, workdir=wd)
                 return True
             except bb.fetch.FetchError:
                 pass
 
         return False
 
-    def update_annex(self, ud, d):
+    def update_annex(self, ud, d, wd):
         try:
-            runfetchcmd("%s annex get --all" % (ud.basecmd), d, quiet=True)
+            runfetchcmd("%s annex get --all" % (ud.basecmd), d, quiet=True, workdir=wd)
         except bb.fetch.FetchError:
             return False
-        runfetchcmd("chmod u+w -R %s/annex" % (ud.clonedir), d, quiet=True)
+        runfetchcmd("chmod u+w -R %s/annex" % (ud.clonedir), d, quiet=True, workdir=wd)
 
         return True
 
     def download(self, ud, d):
         Git.download(self, ud, d)
 
-        os.chdir(ud.clonedir)
-        annex = self.uses_annex(ud, d)
+        annex = self.uses_annex(ud, d, ud.clonedir)
         if annex:
-            self.update_annex(ud, d)
+            self.update_annex(ud, d, ud.clonedir)
 
     def unpack(self, ud, destdir, d):
         Git.unpack(self, ud, destdir, d)
 
-        os.chdir(ud.destdir)
         try:
-            runfetchcmd("%s annex init" % (ud.basecmd), d)
+            runfetchcmd("%s annex init" % (ud.basecmd), d, workdir=ud.destdir)
         except bb.fetch.FetchError:
             pass
 
-        annex = self.uses_annex(ud, d)
+        annex = self.uses_annex(ud, d, ud.destdir)
         if annex:
-            runfetchcmd("%s annex get" % (ud.basecmd), d)
-            runfetchcmd("chmod u+w -R %s/.git/annex" % (ud.destdir), d, quiet=True)
+            runfetchcmd("%s annex get" % (ud.basecmd), d, workdir=ud.destdir)
+            runfetchcmd("chmod u+w -R %s/.git/annex" % (ud.destdir), d, quiet=True, workdir=ud.destdir)
+
diff --git a/bitbake/lib/bb/fetch2/gitsm.py b/bitbake/lib/bb/fetch2/gitsm.py
index 752f1d3c15..6613762048 100644
--- a/bitbake/lib/bb/fetch2/gitsm.py
+++ b/bitbake/lib/bb/fetch2/gitsm.py
@@ -43,10 +43,10 @@ class GitSM(Git):
         """
         return ud.type in ['gitsm']
 
-    def uses_submodules(self, ud, d):
+    def uses_submodules(self, ud, d, wd):
         for name in ud.names:
             try:
-                runfetchcmd("%s show %s:.gitmodules" % (ud.basecmd, ud.revisions[name]), d, quiet=True)
+                runfetchcmd("%s show %s:.gitmodules" % (ud.basecmd, ud.revisions[name]), d, quiet=True, workdir=wd)
                 return True
             except bb.fetch.FetchError:
                 pass
@@ -107,28 +107,25 @@ class GitSM(Git):
         os.mkdir(tmpclonedir)
         os.rename(ud.clonedir, gitdir)
         runfetchcmd("sed " + gitdir + "/config -i -e 's/bare.*=.*true/bare = false/'", d)
-        os.chdir(tmpclonedir)
-        runfetchcmd(ud.basecmd + " reset --hard", d)
-        runfetchcmd(ud.basecmd + " checkout " + ud.revisions[ud.names[0]], d)
-        runfetchcmd(ud.basecmd + " submodule update --init --recursive", d)
+        runfetchcmd(ud.basecmd + " reset --hard", d, workdir=tmpclonedir)
+        runfetchcmd(ud.basecmd + " checkout " + ud.revisions[ud.names[0]], d, workdir=tmpclonedir)
+        runfetchcmd(ud.basecmd + " submodule update --init --recursive", d, workdir=tmpclonedir)
         self._set_relative_paths(tmpclonedir)
-        runfetchcmd("sed " + gitdir + "/config -i -e 's/bare.*=.*false/bare = true/'", d)
+        runfetchcmd("sed " + gitdir + "/config -i -e 's/bare.*=.*false/bare = true/'", d, workdir=tmpclonedir)
         os.rename(gitdir, ud.clonedir,)
         bb.utils.remove(tmpclonedir, True)
 
     def download(self, ud, d):
         Git.download(self, ud, d)
 
-        os.chdir(ud.clonedir)
-        submodules = self.uses_submodules(ud, d)
+        submodules = self.uses_submodules(ud, d, ud.clonedir)
         if submodules:
             self.update_submodules(ud, d)
 
     def unpack(self, ud, destdir, d):
         Git.unpack(self, ud, destdir, d)
         
-        os.chdir(ud.destdir)
-        submodules = self.uses_submodules(ud, d)
+        submodules = self.uses_submodules(ud, d, ud.destdir)
         if submodules:
-            runfetchcmd(ud.basecmd + " checkout " + ud.revisions[ud.names[0]], d)
-            runfetchcmd(ud.basecmd + " submodule update --init --recursive", d)
+            runfetchcmd(ud.basecmd + " checkout " + ud.revisions[ud.names[0]], d, workdir=ud.destdir)
+            runfetchcmd(ud.basecmd + " submodule update --init --recursive", d, workdir=ud.destdir)
diff --git a/bitbake/lib/bb/fetch2/hg.py b/bitbake/lib/bb/fetch2/hg.py
index 3b743ff51d..20df8016da 100644
--- a/bitbake/lib/bb/fetch2/hg.py
+++ b/bitbake/lib/bb/fetch2/hg.py
@@ -169,25 +169,22 @@ class Hg(FetchMethod):
         # If the checkout doesn't exist and the mirror tarball does, extract it
         if not os.path.exists(ud.pkgdir) and os.path.exists(ud.fullmirror):
             bb.utils.mkdirhier(ud.pkgdir)
-            os.chdir(ud.pkgdir)
-            runfetchcmd("tar -xzf %s" % (ud.fullmirror), d)
+            runfetchcmd("tar -xzf %s" % (ud.fullmirror), d, workdir=ud.pkgdir)
 
         if os.access(os.path.join(ud.moddir, '.hg'), os.R_OK):
             # Found the source, check whether need pull
             updatecmd = self._buildhgcommand(ud, d, "update")
-            os.chdir(ud.moddir)
             logger.debug(1, "Running %s", updatecmd)
             try:
-                runfetchcmd(updatecmd, d)
+                runfetchcmd(updatecmd, d, workdir=ud.moddir)
             except bb.fetch2.FetchError:
                 # Runnning pull in the repo
                 pullcmd = self._buildhgcommand(ud, d, "pull")
                 logger.info("Pulling " + ud.url)
                 # update sources there
-                os.chdir(ud.moddir)
                 logger.debug(1, "Running %s", pullcmd)
                 bb.fetch2.check_network_access(d, pullcmd, ud.url)
-                runfetchcmd(pullcmd, d)
+                runfetchcmd(pullcmd, d, workdir=ud.moddir)
                 try:
                     os.unlink(ud.fullmirror)
                 except OSError as exc:
@@ -200,17 +197,15 @@ class Hg(FetchMethod):
             logger.info("Fetch " + ud.url)
             # check out sources there
             bb.utils.mkdirhier(ud.pkgdir)
-            os.chdir(ud.pkgdir)
             logger.debug(1, "Running %s", fetchcmd)
             bb.fetch2.check_network_access(d, fetchcmd, ud.url)
-            runfetchcmd(fetchcmd, d)
+            runfetchcmd(fetchcmd, d, workdir=ud.pkgdir)
 
         # Even when we clone (fetch), we still need to update as hg's clone
         # won't checkout the specified revision if its on a branch
         updatecmd = self._buildhgcommand(ud, d, "update")
-        os.chdir(ud.moddir)
         logger.debug(1, "Running %s", updatecmd)
-        runfetchcmd(updatecmd, d)
+        runfetchcmd(updatecmd, d, workdir=ud.moddir)
 
     def clean(self, ud, d):
         """ Clean the hg dir """
@@ -246,10 +241,9 @@ class Hg(FetchMethod):
             if os.path.islink(ud.fullmirror):
                 os.unlink(ud.fullmirror)
 
-            os.chdir(ud.pkgdir)
             logger.info("Creating tarball of hg repository")
-            runfetchcmd("tar -czf %s %s" % (ud.fullmirror, ud.module), d)
-            runfetchcmd("touch %s.done" % (ud.fullmirror), d)
+            runfetchcmd("tar -czf %s %s" % (ud.fullmirror, ud.module), d, workdir=ud.pkgdir)
+            runfetchcmd("touch %s.done" % (ud.fullmirror), d, workdir=ud.pkgdir)
 
     def localpath(self, ud, d):
         return ud.pkgdir
@@ -269,10 +263,8 @@ class Hg(FetchMethod):
                 logger.debug(2, "Unpack: creating new hg repository in '" + codir + "'")
                 runfetchcmd("%s init %s" % (ud.basecmd, codir), d)
             logger.debug(2, "Unpack: updating source in '" + codir + "'")
-            os.chdir(codir)
-            runfetchcmd("%s pull %s" % (ud.basecmd, ud.moddir), d)
-            runfetchcmd("%s up -C %s" % (ud.basecmd, revflag), d)
+            runfetchcmd("%s pull %s" % (ud.basecmd, ud.moddir), d, workdir=codir)
+            runfetchcmd("%s up -C %s" % (ud.basecmd, revflag), d, workdir=codir)
         else:
             logger.debug(2, "Unpack: extracting source to '" + codir + "'")
-            os.chdir(ud.moddir)
-            runfetchcmd("%s archive -t files %s %s" % (ud.basecmd, revflag, codir), d)
+            runfetchcmd("%s archive -t files %s %s" % (ud.basecmd, revflag, codir), d, workdir=ud.moddir)
diff --git a/bitbake/lib/bb/fetch2/npm.py b/bitbake/lib/bb/fetch2/npm.py
index 2fd43034ba..b26ac22eff 100644
--- a/bitbake/lib/bb/fetch2/npm.py
+++ b/bitbake/lib/bb/fetch2/npm.py
@@ -113,16 +113,13 @@ class Npm(FetchMethod):
             bb.fatal("NPM package %s downloaded not a tarball!" % file)
 
         # Change to subdir before executing command
-        save_cwd = os.getcwd()
         if not os.path.exists(destdir):
             os.makedirs(destdir)
-        os.chdir(destdir)
         path = d.getVar('PATH', True)
         if path:
             cmd = "PATH=\"%s\" %s" % (path, cmd)
-        bb.note("Unpacking %s to %s/" % (file, os.getcwd()))
-        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True)
-        os.chdir(save_cwd)
+        bb.note("Unpacking %s to %s/" % (file, destdir))
+        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True, cwd=destdir)
 
         if ret != 0:
             raise UnpackError("Unpack command %s failed with return value %s" % (cmd, ret), ud.url)
@@ -239,10 +236,7 @@ class Npm(FetchMethod):
         if not os.listdir(ud.pkgdatadir) and os.path.exists(ud.fullmirror):
             dest = d.getVar("DL_DIR", True)
             bb.utils.mkdirhier(dest)
-            save_cwd = os.getcwd()
-            os.chdir(dest)
-            runfetchcmd("tar -xJf %s" % (ud.fullmirror), d)
-            os.chdir(save_cwd)
+            runfetchcmd("tar -xJf %s" % (ud.fullmirror), d, workdir=dest)
             return
 
         shwrf = d.getVar('NPM_SHRINKWRAP', True)
@@ -275,10 +269,8 @@ class Npm(FetchMethod):
             if os.path.islink(ud.fullmirror):
                 os.unlink(ud.fullmirror)
 
-            save_cwd = os.getcwd()
-            os.chdir(d.getVar("DL_DIR", True))
+            dldir = d.getVar("DL_DIR", True)
             logger.info("Creating tarball of npm data")
-            runfetchcmd("tar -cJf %s npm/%s npm/%s" % (ud.fullmirror, ud.bbnpmmanifest, ud.pkgname), d)
-            runfetchcmd("touch %s.done" % (ud.fullmirror), d)
-            os.chdir(save_cwd)
-
+            runfetchcmd("tar -cJf %s npm/%s npm/%s" % (ud.fullmirror, ud.bbnpmmanifest, ud.pkgname), d,
+                        workdir=dldir)
+            runfetchcmd("touch %s.done" % (ud.fullmirror), d, workdir=dldir)
diff --git a/bitbake/lib/bb/fetch2/osc.py b/bitbake/lib/bb/fetch2/osc.py
index d051dfdafa..295abf953b 100644
--- a/bitbake/lib/bb/fetch2/osc.py
+++ b/bitbake/lib/bb/fetch2/osc.py
@@ -88,23 +88,21 @@ class Osc(FetchMethod):
             oscupdatecmd = self._buildosccommand(ud, d, "update")
             logger.info("Update "+ ud.url)
             # update sources there
-            os.chdir(ud.moddir)
             logger.debug(1, "Running %s", oscupdatecmd)
             bb.fetch2.check_network_access(d, oscupdatecmd, ud.url)
-            runfetchcmd(oscupdatecmd, d)
+            runfetchcmd(oscupdatecmd, d, workdir=ud.moddir)
         else:
             oscfetchcmd = self._buildosccommand(ud, d, "fetch")
             logger.info("Fetch " + ud.url)
             # check out sources there
             bb.utils.mkdirhier(ud.pkgdir)
-            os.chdir(ud.pkgdir)
             logger.debug(1, "Running %s", oscfetchcmd)
             bb.fetch2.check_network_access(d, oscfetchcmd, ud.url)
-            runfetchcmd(oscfetchcmd, d)
+            runfetchcmd(oscfetchcmd, d, workdir=ud.pkgdir)
 
-        os.chdir(os.path.join(ud.pkgdir + ud.path))
         # tar them up to a defined filename
-        runfetchcmd("tar -czf %s %s" % (ud.localpath, ud.module), d, cleanup = [ud.localpath])
+        runfetchcmd("tar -czf %s %s" % (ud.localpath, ud.module), d,
+                    cleanup=[ud.localpath], workdir=os.path.join(ud.pkgdir + ud.path))
 
     def supports_srcrev(self):
         return False
diff --git a/bitbake/lib/bb/fetch2/perforce.py b/bitbake/lib/bb/fetch2/perforce.py
index b8169f2cc9..50cb479096 100644
--- a/bitbake/lib/bb/fetch2/perforce.py
+++ b/bitbake/lib/bb/fetch2/perforce.py
@@ -168,15 +168,13 @@ class Perforce(FetchMethod):
 
         bb.utils.remove(ud.pkgdir, True)
         bb.utils.mkdirhier(ud.pkgdir)
-        os.chdir(ud.pkgdir)
 
         for afile in filelist:
             p4fetchcmd = self._buildp4command(ud, d, 'print', afile)
             bb.fetch2.check_network_access(d, p4fetchcmd)
-            runfetchcmd(p4fetchcmd, d)
+            runfetchcmd(p4fetchcmd, d, workdir=ud.pkgdir)
 
-        os.chdir(ud.pkgdir)
-        runfetchcmd('tar -czf %s p4' % (ud.localpath), d, cleanup = [ud.localpath])
+        runfetchcmd('tar -czf %s p4' % (ud.localpath), d, cleanup=[ud.localpath], workdir=ud.pkgdir)
 
     def clean(self, ud, d):
         """ Cleanup p4 specific files and dirs"""
diff --git a/bitbake/lib/bb/fetch2/repo.py b/bitbake/lib/bb/fetch2/repo.py
index fd64b7e626..ecc6e68e97 100644
--- a/bitbake/lib/bb/fetch2/repo.py
+++ b/bitbake/lib/bb/fetch2/repo.py
@@ -69,15 +69,14 @@ class Repo(FetchMethod):
         else:
             username = ""
 
-        bb.utils.mkdirhier(os.path.join(codir, "repo"))
-        os.chdir(os.path.join(codir, "repo"))
-        if not os.path.exists(os.path.join(codir, "repo", ".repo")):
+        repodir = os.path.join(codir, "repo")
+        bb.utils.mkdirhier(repodir)
+        if not os.path.exists(os.path.join(repodir, ".repo")):
             bb.fetch2.check_network_access(d, "repo init -m %s -b %s -u %s://%s%s%s" % (ud.manifest, ud.branch, ud.proto, username, ud.host, ud.path), ud.url)
-            runfetchcmd("repo init -m %s -b %s -u %s://%s%s%s" % (ud.manifest, ud.branch, ud.proto, username, ud.host, ud.path), d)
+            runfetchcmd("repo init -m %s -b %s -u %s://%s%s%s" % (ud.manifest, ud.branch, ud.proto, username, ud.host, ud.path), d, workdir=repodir)
 
         bb.fetch2.check_network_access(d, "repo sync %s" % ud.url, ud.url)
-        runfetchcmd("repo sync", d)
-        os.chdir(codir)
+        runfetchcmd("repo sync", d, workdir=repodir)
 
         scmdata = ud.parm.get("scmdata", "")
         if scmdata == "keep":
@@ -86,7 +85,7 @@ class Repo(FetchMethod):
             tar_flags = "--exclude='.repo' --exclude='.git'"
 
         # Create a cache
-        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, os.path.join(".", "*") ), d)
+        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, os.path.join(".", "*") ), d, workdir=codir)
 
     def supports_srcrev(self):
         return False
diff --git a/bitbake/lib/bb/fetch2/svn.py b/bitbake/lib/bb/fetch2/svn.py
index 968ca79b30..9ff94108ed 100644
--- a/bitbake/lib/bb/fetch2/svn.py
+++ b/bitbake/lib/bb/fetch2/svn.py
@@ -126,25 +126,22 @@ class Svn(FetchMethod):
         if os.access(os.path.join(ud.moddir, '.svn'), os.R_OK):
             svnupdatecmd = self._buildsvncommand(ud, d, "update")
             logger.info("Update " + ud.url)
-            # update sources there
-            os.chdir(ud.moddir)
             # We need to attempt to run svn upgrade first in case its an older working format
             try:
-                runfetchcmd(ud.basecmd + " upgrade", d)
+                runfetchcmd(ud.basecmd + " upgrade", d, workdir=ud.moddir)
             except FetchError:
                 pass
             logger.debug(1, "Running %s", svnupdatecmd)
             bb.fetch2.check_network_access(d, svnupdatecmd, ud.url)
-            runfetchcmd(svnupdatecmd, d)
+            runfetchcmd(svnupdatecmd, d, workdir=ud.moddir)
         else:
             svnfetchcmd = self._buildsvncommand(ud, d, "fetch")
             logger.info("Fetch " + ud.url)
             # check out sources there
             bb.utils.mkdirhier(ud.pkgdir)
-            os.chdir(ud.pkgdir)
             logger.debug(1, "Running %s", svnfetchcmd)
             bb.fetch2.check_network_access(d, svnfetchcmd, ud.url)
-            runfetchcmd(svnfetchcmd, d)
+            runfetchcmd(svnfetchcmd, d, ud.pkgdir)
 
         scmdata = ud.parm.get("scmdata", "")
         if scmdata == "keep":
@@ -152,9 +149,9 @@ class Svn(FetchMethod):
         else:
             tar_flags = "--exclude='.svn'"
 
-        os.chdir(ud.pkgdir)
         # tar them up to a defined filename
-        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, ud.path_spec), d, cleanup = [ud.localpath])
+        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, ud.path_spec), d,
+                    cleanup=[ud.localpath], workdir=ud.pkgdir)
 
     def clean(self, ud, d):
         """ Clean SVN specific files and dirs """