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|
/*
* dpkg - main program for package management
* trigdeferred.l - parsing of triggers/Deferred
*
* Copyright (C) 2007 Canonical Ltd
* written by Ian Jackson <ian@chiark.greenend.org.uk>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2,
* or (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with dpkg; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
%option prefix="trigdef_yy"
/* Reset the name to the default value (instead of using "trigdeferred.c")
* so that automake (ylwrap) can find it. */
%option outfile="lex.yy.c"
%option noyywrap
%option batch
%option nodefault
%option perf-report
%option warn
%option nounput
%x midline
%{
#include <config.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <dpkg.h>
#include <dpkg-db.h>
static struct varbuf fn, newfn;
%}
%%
[ \t\n] /* whitespace */
#.*\n /* comments */
[\x21-\x7e]+ {
trigdef->trig_begin(trigdef_yytext);
BEGIN(midline);
}
<midline>[ \t] /* whitespace */
<midline>[-0-9a-z][-+.0-9a-z]* {
if (trigdef_yytext[0] == '-' && trigdef_yytext[1])
ohshit(_("invalid package name `%.250s' in triggers deferred "
"file `%.250s'"), trigdef_yytext, fn.buf);
trigdef->package(trigdef_yytext);
}
<midline>\n|#.*\n {
trigdef->trig_end();
BEGIN(0);
}
<midline><<EOF>> {
ohshit(_("truncated triggers deferred file `%.250s'"), fn.buf);
}
<*>. {
ohshit(_("syntax error in triggers deferred file `%.250s' at "
"character `%s'%s"),
fn.buf, yytext, YY_START == midline ? " midline": "");
}
%%
/*---------- Deferred file handling ----------*/
static int lock_fd = -1;
static FILE *old_deferred;
FILE *trig_new_deferred;
const struct trigdefmeths *trigdef;
static void
constructfn(struct varbuf *vb, const char *admindir, const char *tail)
{
varbufreset(vb);
varbufaddstr(vb, admindir);
varbufaddstr(vb, "/" TRIGGERSDIR);
varbufaddstr(vb, tail);
varbufaddc(vb, 0);
}
int
trigdef_update_start(enum trigdef_updateflags uf, const char *admindir)
{
struct stat stab;
int r;
if (uf & tduf_write) {
constructfn(&fn, admindir, TRIGGERSLOCKFILE);
if (lock_fd == -1) {
lock_fd = open(fn.buf, O_RDWR | O_CREAT | O_TRUNC, 0600);
if (lock_fd == -1) {
if (!(errno == ENOENT && (uf & tduf_nolockok)))
ohshite(_("unable to open/create "
"triggers lockfile `%.250s'"),
fn.buf);
return -1;
}
}
lock_file(&lock_fd, fn.buf, _("unable to lock triggers area"),
NULL);
} else {
/* Dummy for pop_cleanups. */
push_cleanup(NULL, 0, NULL, 0, 0);
}
constructfn(&fn, admindir, TRIGGERSDEFERREDFILE);
r = stat(fn.buf, &stab);
if (r) {
if (errno != ENOENT)
ohshite(_("unable to stat triggers deferred file `%.250s'"),
fn.buf);
} else if (!stab.st_size) {
if (!(uf & tduf_writeifempty)) {
pop_cleanup(ehflag_normaltidy);
return -2;
}
}
if (old_deferred)
fclose(old_deferred);
old_deferred = fopen(fn.buf, "r");
if (!old_deferred) {
if (errno != ENOENT)
ohshite(_("unable to open triggers deferred file `%.250s'"),
fn.buf);
if (!(uf & tduf_writeifenoent)) {
pop_cleanup(ehflag_normaltidy);
return -3;
}
}
if (uf & tduf_write) {
constructfn(&newfn, admindir, TRIGGERSDEFERREDFILE ".new");
if (trig_new_deferred)
fclose(trig_new_deferred);
trig_new_deferred = fopen(newfn.buf, "w");
if (!trig_new_deferred)
ohshite(_("unable to open/create new triggers deferred file `%.250s'"),
newfn.buf);
}
if (!old_deferred)
return 1;
trigdef_yyrestart(old_deferred);
BEGIN(0);
return 2;
}
void
trigdef_process_done(void)
{
int r;
if (old_deferred) {
if (ferror(old_deferred))
ohshite(_("error reading triggers deferred file `%.250s'"),
fn.buf);
fclose(old_deferred);
old_deferred = NULL;
}
if (trig_new_deferred) {
if (ferror(trig_new_deferred))
ohshite(_("unable to write new triggers deferred "
"file `%.250s'"), newfn.buf);
r = fclose(trig_new_deferred);
trig_new_deferred = NULL;
if (r)
ohshite(_("unable to close new triggers deferred "
"file `%.250s'"), newfn.buf);
if (rename(newfn.buf, fn.buf))
ohshite(_("unable to install new triggers deferred "
"file `%.250s'"), fn.buf);
}
/* Unlock. */
pop_cleanup(ehflag_normaltidy);
}
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