bug#7130: 24.0.50; EPA queries twice and doesn't cache passwords when decrypting files

[Tassilo Horn]

I use several symmetrically encrypted files, like my ~/.authinfo.gpg
used by Gnus.  That file is a symlink to
~/repos/configs/dot-authinfo.gpg.  When I find it using emacs (started
with or without -Q), I have to give my password in a pinentry window,
then I have to accept following the symlink, and then I have to provide
the password a second time.

--8<---------------cut here---------------start------------->8---
For information about GNU Emacs and the GNU system, type C-h C-a.
/home/horn/.authinfo: 0% (0/248)
/home/horn/.authinfo: 100% (248/248)
Loading vc-git...done
/home/horn/repos/con: 0% (0/248)
/home/horn/repos/con: 100% (248/248)
Followed link to /home/horn/repos/configs/dot-authinfo.gpg
--8<---------------cut here---------------end--------------->8---

And although I have epa-file-cache-passphrase-for-symmetric-encryption
set to t, the passwords are not cached (epa-file-passphrase-alist is
nil).  I've tried to edebug epa-file-passphrase-callback-function, but
I'm never put into the debugger.  That function seems not to be
called...

That's a pretty serious issue for me, because since I entrypted my
.authinfo (which is good!), I have to enter my password for that file
gazillion times when starting up Gnus where I use 4 mail/news accounts
requiring authentication...


In GNU Emacs 24.0.50.1 (x86_64-pc-linux-gnu)
 of 2010-09-28 on thinkpad
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
configured using `configure  '--prefix=/usr' '--build=x86_64-pc-linux-gnu' 
'--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' 
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' 
'--localstatedir=/var/lib' '--libdir=/usr/lib64' '--program-suffix=-emacs-24' 
'--infodir=/usr/share/info/emacs-24' '--with-crt-dir=/usr/lib64' 
'--without-compress-info' '--with-sound' '--with-x' '--without-gconf' 
'--with-xml2' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' 
'--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--with-imagemagick' 
'--with-xft' '--with-libotf' '--with-m17n-flt' '--with-x-toolkit=no' 
'--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' 
'--with-dbus' 'build_alias=x86_64-pc-linux-gnu' 
'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-march=native -O2 -pipe' 
'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  diff-auto-refine-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  recentf-mode: t
  window-number-meta-mode: t
  window-number-mode: t
  autopair-global-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-c a a s t a t <return> M-x g n u s <return> C-c o 
o C-c o a a f M-x C-g <down> <down> <down> <down> <down> 
<down> q C-x b <return> <up> <up> <up> <up> <down> 
<tab> <tab> <down> <down> <tab> <return> <backspace> 
C-e <return> * * * SPC C O D O <backspace> <backspace> 
<backspace> <backspace> T O D O SPC A l l g e m e i 
n e n SPC T e i l SPC v e r v o l l s t ä n d i g e 
n C-c C-d <S-down> <S-right> <S-right> <return> <down> 
<return> <up> <up> C-x C-s C-x b g r <return> l <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <return> <up> <up> <return> <up> <up> <up> ^ 
<down> O q <down> <up> <return> <up> <up> <return> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <up> M-b r e M-x r e p 
<tab> o <tab> r <tab> b <tab> <return>

Recent messages:
20100929T093025.142> Group nndraft:queue contains no messages
20100929T093102.612> Retrieving newsgroup: nndraft:drafts...
20100929T093102.622> Group nndraft:drafts contains no messages
20100929T093103.885> Retrieving newsgroup: nndraft:queue...
20100929T093103.894> Group nndraft:queue contains no messages
20100929T093109.203> Compiling format specs...
20100929T093109.207> Compiling user specs...done
==> ~/.gnus.el successfully loaded. <==
20100929T093109.207> Read ~/.gnus
Making completion list... [2 times]

Load-path shadows:
~/repos/el/gnus/lisp/sha1 hides /usr/share/emacs/24.0.50/lisp/sha1
~/repos/el/gnus/lisp/pgg-pgp hides /usr/share/emacs/24.0.50/lisp/pgg-pgp
~/repos/el/gnus/lisp/pgg-parse hides /usr/share/emacs/24.0.50/lisp/pgg-parse
~/repos/el/gnus/lisp/pgg-pgp5 hides /usr/share/emacs/24.0.50/lisp/pgg-pgp5
~/repos/el/gnus/lisp/pgg hides /usr/share/emacs/24.0.50/lisp/pgg
~/repos/el/gnus/lisp/pgg-gpg hides /usr/share/emacs/24.0.50/lisp/pgg-gpg
~/repos/el/gnus/lisp/pgg-def hides /usr/share/emacs/24.0.50/lisp/pgg-def
~/repos/el/gnus/lisp/password-cache hides 
/usr/share/emacs/24.0.50/lisp/password-cache
~/repos/el/gnus/lisp/md4 hides /usr/share/emacs/24.0.50/lisp/md4
~/repos/el/gnus/lisp/hex-util hides /usr/share/emacs/24.0.50/lisp/hex-util
~/repos/el/gnus/lisp/format-spec hides /usr/share/emacs/24.0.50/lisp/format-spec
~/repos/el/gnus/lisp/dns-mode hides 
/usr/share/emacs/24.0.50/lisp/textmodes/dns-mode
~/repos/el/org-mode/lisp/org-xoxo hides 
/usr/share/emacs/24.0.50/lisp/org/org-xoxo
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/usr/share/emacs/24.0.50/lisp/org/org-table
~/repos/el/org-mode/lisp/org-w3m hides /usr/share/emacs/24.0.50/lisp/org/org-w3m
~/repos/el/org-mode/lisp/org-timer hides 
/usr/share/emacs/24.0.50/lisp/org/org-timer
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~/repos/el/org-mode/lisp/org-mac-message hides 
/usr/share/emacs/24.0.50/lisp/org/org-mac-message
~/repos/el/org-mode/lisp/org-latex hides 
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~/repos/el/org-mode/lisp/org-jsinfo hides 
/usr/share/emacs/24.0.50/lisp/org/org-jsinfo
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~/repos/el/org-mode/lisp/org-install hides 
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~/repos/el/org-mode/lisp/org-indent hides 
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~/repos/el/org-mode/lisp/org-html hides 
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~/repos/el/org-mode/lisp/org-habit hides 
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~/repos/el/org-mode/lisp/org hides /usr/share/emacs/24.0.50/lisp/org/org
~/repos/el/org-mode/lisp/org-freemind hides 
/usr/share/emacs/24.0.50/lisp/org/org-freemind
~/repos/el/org-mode/lisp/org-gnus hides 
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~/repos/el/org-mode/lisp/org-feed hides 
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~/repos/el/org-mode/lisp/org-exp hides /usr/share/emacs/24.0.50/lisp/org/org-exp
~/repos/el/org-mode/lisp/org-exp-blocks hides 
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~/repos/el/org-mode/lisp/org-footnote hides 
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~/repos/el/org-mode/lisp/org-docview hides 
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~/repos/el/org-mode/lisp/org-docbook hides 
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~/repos/el/org-mode/lisp/org-entities hides 
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~/repos/el/org-mode/lisp/org-capture hides 
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~/repos/el/org-mode/lisp/org-bibtex hides 
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~/repos/el/org-mode/lisp/org-bbdb hides 
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~/repos/el/org-mode/lisp/org-attach hides 
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~/repos/el/org-mode/lisp/org-archive hides 
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~/repos/el/org-mode/lisp/ob-tangle hides 
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~/repos/el/org-mode/lisp/ob-sqlite hides 
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~/repos/el/org-mode/lisp/ob-sql hides /usr/share/emacs/24.0.50/lisp/org/ob-sql
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~/repos/el/org-mode/lisp/ob-dot hides /usr/share/emacs/24.0.50/lisp/org/ob-dot
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~/repos/el/gnus/lisp/tls hides /usr/share/emacs/24.0.50/lisp/net/tls
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Features:
(shadow sort gnus-cite footnote emacsbug gnus-draft gnus-ml disp-table
mule-util cal-move org-colview cal-iso xgit-dvc xgit xgit-annotate
dvc-annotate xgit-log gnus-topic nnagent nnml utf-7 nnimap parse-time
utf7 nndraft nnmh bbdb-gnus bbdb-snarf mail-extr bbdb-com nnnil
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art
mm-uu mml2015 mm-view smime password-cache dig nntp gnus-cache nnir
gnus-sum nnoo gnus-group gnus-undo nnmail mail-source th-private
gnus-start gnus-spec gnus-int gnus-range gnus-win tla smerge-mode
dvc-state dvc-config dvc-diff dvc-fileinfo diff tla-gnus dvc-gnus
dvc-cmenu dvc-about dvc-version dvc-revlist bzr-core tla-core
tla-autoconf tla-defs dvc-log vc vc-dispatcher dvc-unified dvc-tips
ediff-merg ediff-diff ediff-wind ediff-help ediff-util ediff-mult
ediff-init ediff xdarcs-core xgit-core xhg-core xmtn-minimal filecache
eldoc finder-inf package go-mode-load flymake greqlscript-mode
greql-mode tg-mode generic th-latex paredit dvc-autoloads dvc-core
dvc-lisp dvc-buffers dvc-ui dvc-register dvc-utils dvc-emacs ewoc
dvc-defs dvc-site magit diff-mode log-edit pcvs-util add-log
magit-key-mode epa-file epa epg epg-config wtf cus-edit cus-start
cus-load rdictcc org-location-google-maps google-maps google-maps-static
google-maps-geocode google-maps-base json org-google-weather format-spec
google-weather xml url-cache org-beamer solar cal-dst holidays
hol-loaddefs appt diary-lib diary-loaddefs vc-git hl-line org-w3m
org-irc org-jsinfo org-infojs org-html org-exp ob-exp org-exp-blocks
org-info org-gnus org-docview org-bibtex org-bbdb org-protocol
org-attach org-id org-agenda org ob-emacs-lisp ob-tangle ob-ref ob-lob
ob-table org-footnote org-src ob-comint ob-keys ob org-list org-faces
org-compat org-entities org-macs time-date org-install cal-menu calendar
cal-loaddefs dired-x dired-aux highlight-symbol hi-lock th-boxquote
boxquote rect ecomplete message idna sendmail rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader info
server auto-complete-config auto-complete popup yasnippet dropdown-list
help-mode view noutline outline browse-kill-ring derived recentf
tree-widget sr-speedbar speedbar sb-image ezimage dframe assoc
anything-config warnings compile comint ring semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw eieio
byte-opt bytecomp byte-compile mode-local cedet imenu w3m-bookmark w3m
browse-url doc-view jka-compr image-mode w3m-hist w3m-fb w3m-ems w3m-ccl
ccl w3m-favicon w3m-image w3m-proc w3m-util bookmark pp easymenu rx ffap
thingatpt anything window-number uniquify autopair easy-mmode subword
saveplace savehist paren lusty-explorer dired cl cl-19 edmacro kmacro
advice help-fns advice-preload th-common mm-url gnus gnus-ems nnheader
mail-utils wid-edit url-http tls url url-proxy url-privacy url-expand
url-methods url-history mailcap url-auth mail-parse rfc2231 rfc2047
rfc2045 ietf-drums url-cookie url-util url-parse auth-source netrc
gnus-util url-gw url-vars mm-util mail-prsvr windmove gnus-load
site-gentoo w3m-load preview-latex bbdb-autoloads bbdb regexp-opt
timezone tex-site auto-loads tooltip ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew
greek romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
font-render-setting x multi-tty emacs)