Added a comment

doc/bugs/Android_fails_on_Google_Nexus_10_Jellybean/comment_1_b41666c032aeb2d0de35023328391edb._comment

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+[[!comment format=mdwn
+ username="http://joeyh.name/"
+ ip="209.250.56.55"
+ subject="comment 1"
+ date="2014-07-03T20:10:41Z"
+ content="""
+This is not an installation problem; the /data/app-lib message is a red herring.
+
+Is /sdcard/mediashare a directory that already existed? If so, perhaps it's some \"mediashare\" thing that has a even more crippled filesystem than usual. Seems possible, but I don't know. Want to rule it out..
+
+The actual failure seems to be when git tries to write to its config.lock file, and changes its permissions. This is a recent change in git, commit daa22c6f8da466bd7a438f1bc27375fd737ffcf3, \"config: preserve config file permissions on edits\".
+
+[[!language C \"\"\"
++               if (fchmod(fd, st.st_mode & 07777) < 0) {
++                       error(\"fchmod on %s failed: %s\",
++                               lock->filename, strerror(errno));
++                       ret = CONFIG_NO_WRITE;
++                       goto out_free;
++               }
+\"\"\"]]
+
+This seems utterly innocuous; the config file has some mode, and this just sets that same mode back (excluding some high bit flags). But Android goes out of its way to make /sdcard the most craptacular filesystem in use on any Linux system, so I'm not really surprised that it might just refuse all fchmod even when it's a no-op. (This is the only fchmod call currently in git.)
+
+I've patched the bundled git to work around this. Will be a while until there is an updated autobuild..
+"""]]