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/*
* dselect - Debian package maintenance user interface
* method.cc - access method handling
*
* Copyright © 1995 Ian Jackson <ian@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,
* 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.
*/
#include <config.h>
#include <compat.h>
#include <dpkg/i18n.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <limits.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/file.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/subproc.h>
#include "dselect.h"
#include "method.h"
static const char *const methoddirectories[]= {
LIBDIR "/" METHODSDIR,
LOCALLIBDIR "/" METHODSDIR,
0
};
static char *methodlockfile= 0;
static int methlockfd= -1;
static void
sthfailed(const char * reasoning)
{
char buf[2048];
curseson();
clear();
sprintf(buf,_("\n\n%s: %s\n"),DSELECT,reasoning);
addstr(buf);
attrset(A_BOLD);
addstr(_("\nPress <enter> to continue."));
attrset(A_NORMAL);
refresh(); getch();
}
static void cu_unlockmethod(int, void**) {
struct flock fl;
assert(methodlockfile);
assert(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("unable to unlock access method area");
}
static enum urqresult ensureoptions(void) {
const char *const *ccpp;
dselect_option *newoptions;
int nread;
if (!options) {
newoptions= 0;
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) {
int l;
l= strlen(admindir);
methodlockfile= new char[l+sizeof(METHLOCKFILE)+2];
strcpy(methodlockfile,admindir);
strcpy(methodlockfile+l, "/" 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("unable to open/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 == EWOULDBLOCK || errno == EAGAIN) {
sthfailed("the access method area is already locked");
return urqr_fail;
}
sthfailed("unable to lock access method area");
return urqr_fail;
}
push_cleanup(cu_unlockmethod,~0, 0,0, 0);
return urqr_normal;
}
urqresult falliblesubprocess(const char *exepath, const char *name,
const char *const *args) {
pid_t c1, cr;
int status, i, c;
cursesoff();
setup_subproc_signals(name);
if (!(c1= m_fork())) {
cu_subproc_signals(0, 0);
execvp(exepath,(char* const*) args);
ohshite(_("unable to run %.250s process `%.250s'"),name,exepath);
}
while ((cr= waitpid(c1,&status,0)) == -1)
if (errno != EINTR) ohshite(_("unable to wait for %.250s"),name);
if (cr != c1)
ohshit(_("got wrong child's status - asked for %ld, got %ld"),(long)c1,(long)cr);
pop_cleanup(ehflag_normaltidy);
if (WIFEXITED(status) && !WEXITSTATUS(status)) {
sleep(1);
return urqr_normal;
}
fprintf(stderr,"\n%s ",name);
if (WIFEXITED(status)) {
i= WEXITSTATUS(status);
fprintf(stderr,_("returned error exit status %d.\n"),i);
} else if (WIFSIGNALED(status)) {
i= WTERMSIG(status);
if (i == SIGINT) {
fprintf(stderr,_("was interrupted.\n"));
} else {
fprintf(stderr,_("was terminated by a signal: %s.\n"),strsignal(i));
}
if (WCOREDUMP(status))
fprintf(stderr,_("(It left a coredump.)\n"));
} else {
fprintf(stderr,_("failed with an unknown wait return code %d.\n"),status);
}
fprintf(stderr,_("Press <enter> to continue.\n"));
m_output(stderr, _("<standard error>"));
do { c= fgetc(stdin); } while ((c == ERR && errno==EINTR) || ((c != '\n') && c != EOF));
if ((c == ERR) || (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) {
strcpy(coption->meth->pathinmeth,exepath);
const char *fallibleargs[] = {
exepath,
admindir,
coption->meth->name,
coption->name,
0
};
ur= falliblesubprocess(coption->meth->path,name,fallibleargs);
} else {
sthfailed("no access method is selected/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) {
const char *fallibleargs[] = {
DPKG,
"--admindir",
admindir,
"--pending",
dpkgmode,
0
};
cursesoff();
printf("running dpkg --pending %s ...\n",dpkgmode);
fflush(stdout);
return falliblesubprocess(DPKG,name,fallibleargs);
}
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) {
strcpy(coption->meth->pathinmeth,METHODSETUPSCRIPT);
const char *fallibleargs[] = {
METHODSETUPSCRIPT,
admindir,
coption->meth->name,
coption->name,
0
};
ur= falliblesubprocess(coption->meth->path,_("query/setup script"),fallibleargs);
if (ur == urqr_normal) writecurrentopt();
} else {
ur= urqr_fail;
}
pop_cleanup(ehflag_normaltidy);
return ur;
}
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