Re: [BUG] inconsistent user context handling w/ tramp

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+From: David Bremner <david@tethera.net>\r
+To: Simon Campese <notmuchmail_org@campese.de>, notmuch@notmuchmail.org\r
+Subject: Re: [BUG] inconsistent user context handling w/ tramp\r
+In-Reply-To: <874nguxbvq.fsf@tu-dortmund.de>\r
+References: <874nguxbvq.fsf@tu-dortmund.de>\r
+User-Agent: Notmuch/0.15.2+32~g16aa65b (http://notmuchmail.org) Emacs/24.2.1\r
+       (x86_64-pc-linux-gnu)\r
+Date: Sat, 02 Mar 2013 14:50:19 -0400\r
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+\r
+Simon Campese <notmuchmail_org@campese.de> writes:\r
+\r
+> Hello,\r
+>\r
+> after using tramp to open a file using the 'su' or 'sudo' protocol as\r
+> user X, the next time I run 'compose-mail' to compose a message it\r
+> apparently looks in the home directory of user X for its config file,\r
+> mail directory etc. In the compose window, I get the error message\r
+>\r
+> 'Error reading configuration file $X_homedir/.notmuch-config: No such\r
+> file or directory'\r
+>\r
+> in all header fields (From, Fcc etc.) that should be filled by notmuch\r
+> ($X_homedir  is the home directory of user X from above).\r
+>\r
+\r
+I don't think this is specific to notmuch. Notmuch uses the HOME\r
+environment variable to locate it's configuration file, and tramp is\r
+modifying this environment variable. \r
+\r
+To verify this:\r
+\r
+Start emacs with "emacs -Q"\r
+open a file use /su:user_@localhost:filename\r
+run M-! (or M-x shell-command) echo $HOME\r
+\r
+you will see that the variable is changed to the home directory of\r
+user_x.\r
+\r
+If you think this behaviour of tramp is wrong (I didn't think through\r
+all the implications), then you could file an emacs bug.\r
+\r
+Do you see this behaviour when running compose-mail from a buffer that\r
+is not a tramp buffer?\r
+\r
+All that said, the patches of \r
+\r
+     mid:2f89028f7986f67792478f1728ca1f1fdd382d3c.1359495450.git.jani@nikula.org\r
+\r
+could be used to work around this "feature" of tramp.  In fact since\r
+they were stalled a bit waiting for a convincing use case, maybe your\r
+report will help get them into notmuch more quickly.\r
+\r
+Someone would still have to modify the emacs client side code, but at\r
+least conceptually I don't think that would be difficult.\r
+\r
+d\r
+\r
+PS: all my tests where with Emacs 24.2.1\r
+\r
+\r