fetch2: fix fetching git submodules with git 1.7.9.x or older

Git versions older than 1.7.10 put absolute paths in configuration files
for the submodule repositories, leading to errors when the repository
checkout is moved. We move the repository as a matter of course in the
gitsm fetcher; the failure occurs in do_unpack). Change the absolute
paths to be relative during processing to fix this.

(At the time of writing, Ubuntu 12.04.4 LTS ships Git version 1.7.9.5,
hence the desire to fix this rather than just mandating a newer Git
version.)

Fixes [YOCTO #5525].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/bb/fetch2/gitsm.py b/lib/bb/fetch2/gitsm.py
index 9fdde468cb2ce20a5b0713845096ceb6a774ba74..1a762153c49982bd43e4a67bf36ce488a4edd333 100644 (file)
--- a/lib/bb/fetch2/gitsm.py
+++ b/lib/bb/fetch2/gitsm.py
@@ -42,6 +42,53 @@ class GitSM(Git):
                 pass
         return False
 
+    def _set_relative_paths(self, repopath):
+        """
+        Fix submodule paths to be relative instead of absolute,
+        so that when we move the repo it doesn't break
+        (In Git 1.7.10+ this is done automatically)
+        """
+        submodules = []
+        with open(os.path.join(repopath, '.gitmodules'), 'r') as f:
+            for line in f.readlines():
+                if line.startswith('[submodule'):
+                    submodules.append(line.split('"')[1])
+
+        for module in submodules:
+            repo_conf = os.path.join(repopath, module, '.git')
+            if os.path.exists(repo_conf):
+                with open(repo_conf, 'r') as f:
+                    lines = f.readlines()
+                newpath = ''
+                for i, line in enumerate(lines):
+                    if line.startswith('gitdir:'):
+                        oldpath = line.split(': ')[-1].rstrip()
+                        if oldpath.startswith('/'):
+                            newpath = '../' * (module.count('/') + 1) + '.git/modules/' + module
+                            lines[i] = 'gitdir: %s\n' % newpath
+                            break
+                if newpath:
+                    with open(repo_conf, 'w') as f:
+                        for line in lines:
+                            f.write(line)
+
+            repo_conf2 = os.path.join(repopath, '.git', 'modules', module, 'config')
+            if os.path.exists(repo_conf2):
+                with open(repo_conf2, 'r') as f:
+                    lines = f.readlines()
+                newpath = ''
+                for i, line in enumerate(lines):
+                    if line.lstrip().startswith('worktree = '):
+                        oldpath = line.split(' = ')[-1].rstrip()
+                        if oldpath.startswith('/'):
+                            newpath = '../' * (module.count('/') + 3) + module
+                            lines[i] = '\tworktree = %s\n' % newpath
+                            break
+                if newpath:
+                    with open(repo_conf2, 'w') as f:
+                        for line in lines:
+                            f.write(line)
+
     def update_submodules(self, ud, d):
         # We have to convert bare -> full repo, do the submodule bit, then convert back
         tmpclonedir = ud.clonedir + ".tmp"
@@ -54,6 +101,7 @@ class GitSM(Git):
         runfetchcmd(ud.basecmd + " reset --hard", d)
         runfetchcmd(ud.basecmd + " submodule init", d)
         runfetchcmd(ud.basecmd + " submodule update", d)
+        self._set_relative_paths(tmpclonedir)
         runfetchcmd("sed " + gitdir + "/config -i -e 's/bare.*=.*false/bare = true/'", d)
         os.rename(gitdir, ud.clonedir,)
         bb.utils.remove(tmpclonedir, True)