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/*
* dselect - Debian package maintenance user interface
* method.cc - access method handling
*
* Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright © 2001,2002 Wichert Akkerman <wakkerma@debian.org>
*
* 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 <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/subproc.h>
#include <dpkg/command.h>
#include "dselect.h"
#include "method.h"
static const char *const methoddirectories[]= {
LIBDIR "/" METHODSDIR,
LOCALLIBDIR "/" METHODSDIR,
nullptr
};
static char *methodlockfile = nullptr;
static int methlockfd= -1;
static void
sthfailed(const char * reasoning)
{
curseson();
clear();
printw("\n\n%s: %s\n", DSELECT, reasoning);
attrset(A_BOLD);
addstr(_("\nPress <enter> to continue."));
attrset(A_NORMAL);
refresh(); getch();
}
static void cu_unlockmethod(int, void**) {
struct flock fl;
if (methodlockfile == nullptr)
internerr("method lock file is nullptr");
if (methlockfd < 0)
internerr("method lock fd is %d < 0", methlockfd);
fl.l_type=F_UNLCK; fl.l_whence= SEEK_SET; fl.l_start=fl.l_len=0;
if (fcntl(methlockfd,F_SETLK,&fl) == -1)
sthfailed(_("cannot unlock access method area"));
}
static enum urqresult ensureoptions(void) {
const char *const *ccpp;
dselect_option *newoptions;
int nread;
if (!options) {
newoptions = nullptr;
nread= 0;
for (ccpp= methoddirectories; *ccpp; ccpp++)
readmethods(*ccpp, &newoptions, &nread);
if (!newoptions) {
sthfailed(_("no access methods are available"));
return urqr_fail;
}
options= newoptions;
noptions= nread;
}
return urqr_normal;
}
static enum urqresult lockmethod(void) {
struct flock fl;
if (methodlockfile == nullptr)
methodlockfile = dpkg_db_get_path(METHLOCKFILE);
if (methlockfd == -1) {
methlockfd= open(methodlockfile, O_RDWR|O_CREAT|O_TRUNC, 0660);
if (methlockfd == -1) {
if ((errno == EPERM) || (errno == EACCES)) {
sthfailed(_("requested operation requires superuser privilege"));
return urqr_fail;
}
sthfailed(_("cannot open or create access method lockfile"));
return urqr_fail;
}
}
fl.l_type=F_WRLCK; fl.l_whence=SEEK_SET; fl.l_start=fl.l_len=0;
if (fcntl(methlockfd,F_SETLK,&fl) == -1) {
if (errno == EACCES || errno == EAGAIN) {
sthfailed(_("the access method area is already locked"));
return urqr_fail;
}
sthfailed(_("cannot lock access method area"));
return urqr_fail;
}
push_cleanup(cu_unlockmethod, ~0, 0);
return urqr_normal;
}
static urqresult
falliblesubprocess(struct command *cmd)
{
pid_t pid;
int i, c;
cursesoff();
subproc_signals_ignore(cmd->name);
pid = subproc_fork();
if (pid == 0) {
subproc_signals_cleanup(0, nullptr);
command_exec(cmd);
}
fprintf(stderr, "\n");
i = subproc_reap(pid, cmd->name, SUBPROC_WARN);
subproc_signals_restore();
if (i == 0) {
sleep(1);
return urqr_normal;
}
fprintf(stderr,_("Press <enter> to continue.\n"));
m_output(stderr, _("<standard error>"));
do {
c = fgetc(stdin);
} while ((c == EOF && errno == EINTR) || (c != '\n' && c != EOF));
if (c == EOF)
ohshite(_("error reading acknowledgement of program failure message"));
return urqr_fail;
}
static urqresult runscript(const char *exepath, const char *name) {
urqresult ur;
ur= ensureoptions(); if (ur != urqr_normal) return ur;
ur=lockmethod(); if (ur != urqr_normal) return ur;
getcurrentopt();
if (coption) {
struct command cmd;
strcpy(coption->meth->pathinmeth,exepath);
command_init(&cmd, coption->meth->path, name);
command_add_args(&cmd, exepath, dpkg_db_get_dir(),
coption->meth->name, coption->name, nullptr);
ur = falliblesubprocess(&cmd);
command_destroy(&cmd);
} else {
sthfailed(_("no access method is selected or configured"));
ur= urqr_fail;
}
pop_cleanup(ehflag_normaltidy);
return ur;
}
urqresult urq_update(void) {
return runscript(METHODUPDATESCRIPT,_("update available list script"));
}
urqresult urq_install(void) {
return runscript(METHODINSTALLSCRIPT,_("installation script"));
}
static urqresult rundpkgauto(const char *name, const char *dpkgmode) {
urqresult ur;
struct command cmd;
command_init(&cmd, DPKG, name);
command_add_args(&cmd, DPKG, "--admindir", dpkg_db_get_dir(), "--pending",
dpkgmode, nullptr);
cursesoff();
printf(_("running %s %s ...\n"), "dpkg --pending", dpkgmode);
fflush(stdout);
ur = falliblesubprocess(&cmd);
command_destroy(&cmd);
return ur;
}
urqresult urq_remove(void) {
return rundpkgauto("dpkg --remove","--remove");
}
urqresult urq_config(void) {
return rundpkgauto("dpkg --configure","--configure");
}
urqresult urq_setup(void) {
quitaction qa;
urqresult ur;
ur= ensureoptions(); if (ur != urqr_normal) return ur;
ur=lockmethod(); if (ur != urqr_normal) return ur;
getcurrentopt();
curseson();
methodlist *l= new methodlist();
qa= l->display();
delete l;
if (qa == qa_quitchecksave) {
struct command cmd;
strcpy(coption->meth->pathinmeth,METHODSETUPSCRIPT);
command_init(&cmd, coption->meth->path, _("query/setup script"));
command_add_args(&cmd, METHODSETUPSCRIPT, dpkg_db_get_dir(),
coption->meth->name, coption->name, nullptr);
ur = falliblesubprocess(&cmd);
command_destroy(&cmd);
if (ur == urqr_normal) writecurrentopt();
} else {
ur= urqr_fail;
}
pop_cleanup(ehflag_normaltidy);
return ur;
}
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