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|
/*
* libdpkg - Debian packaging suite library routines
* trigdeferred.l - parsing of triggers/Deferred
*
* Copyright © 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 of the License, 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
%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 noinput
%option nounput
%x midline
%top {
#include <config.h>
#include <compat.h>
}
%{
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/file.h>
#include <dpkg/dir.h>
#include <dpkg/trigdeferred.h>
#include <dpkg/triglib.h>
#define YY_DECL int trigdef_parse(void)
static struct varbuf fn, newfn;
static const struct trigdefmeths *trigdef;
%}
%%
[ \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 char *triggersdir;
static int lock_fd = -1;
static FILE *old_deferred;
static FILE *trig_new_deferred;
static void
constructfn(struct varbuf *vb, const char *dir, const char *tail)
{
varbuf_reset(vb);
varbuf_add_str(vb, dir);
varbuf_add_char(vb, '/');
varbuf_add_str(vb, tail);
varbuf_end_str(vb);
}
/**
* Start processing of the triggers deferred file.
*
* @retval -1 Lock ENOENT with O_CREAT (directory does not exist).
* @retval -2 Unincorp empty, tduf_writeifempty unset.
* @retval -3 Unincorp ENOENT, tduf_writeifenoent unset.
* @retval 1 Unincorp ENOENT, tduf_writeifenoent set.
* @retval 2 Ok.
*
* For positive return values the caller must call trigdef_update_done!
*/
enum trigdef_update_status
trigdef_update_start(enum trigdef_updateflags uf)
{
struct stat stab;
int r;
triggersdir = dpkg_db_get_path(TRIGGERSDIR);
if (uf & tduf_write) {
constructfn(&fn, triggersdir, 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 tdus_error_no_dir;
}
}
file_lock(&lock_fd, FILE_LOCK_WAIT, fn.buf, _("triggers area"));
} else {
/* Dummy for pop_cleanups. */
push_cleanup(NULL, 0, NULL, 0, 0);
}
constructfn(&fn, triggersdir, 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 tdus_error_empty_deferred;
}
}
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 tdus_error_no_deferred;
}
}
if (uf & tduf_write) {
constructfn(&newfn, triggersdir, 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 tdus_no_deferred;
trigdef_yyrestart(old_deferred);
BEGIN(0);
return tdus_ok;
}
void
trigdef_set_methods(const struct trigdefmeths *methods)
{
trigdef = methods;
}
void
trigdef_update_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(trig_new_deferred, format, ap);
va_end(ap);
}
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);
dir_sync_path(triggersdir);
}
free(triggersdir);
triggersdir = NULL;
/* Unlock. */
pop_cleanup(ehflag_normaltidy);
}
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