[pacman-dev] trans.c : reworking of transaction interruptions.

[Xavier]

My two previous hack related to this part (8038190c7c4786e1c49494eea1b40cdddcbd5136
and b15a5194d1a8485a2769560e49e6ff03e1862533) were caused by the lack of understanding
of a feature introduced a while ago :
Better control over CTRL-C interruptions -- do not leave the DB in an inconsistent state
(54008798efcc9646f622f6b052ecd83281d57cda).

Now I have been looking at this commit, and the added feature is indeed interesting.
The main problem I had with it is that it does a rather unusual use of alpm_trans_release,
which caused a few problems that I tried to fix in a weird way. I think these problems were
caused by the fact that there wasn't any difference between an "interrupt transaction" and
a "release a transaction which failed" actions from alpm_trans_release POV.
So I decided to add a new function instead, alpm_trans_interrupt, which is called on Ctrl+C,
and which only sets trans->state to STATE_INTERRUPTED so that remove_commit and add_commit
can exit cleanly at a safe moment.
This allowed me to revert my two previous hacks as well.

Signed-off-by: Chantry Xavier <shiningxc at gmail.com>
---
 lib/libalpm/add.c    |    8 +++-----
 lib/libalpm/alpm.h   |    1 +
 lib/libalpm/db.c     |    6 ++----
 lib/libalpm/remove.c |    5 ++---
 lib/libalpm/trans.c  |   33 ++++++++++++++++++++++-----------
 src/pacman/pacman.c  |    4 ++--
 6 files changed, 32 insertions(+), 25 deletions(-)
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