|
 |
2ff057 |
#include "system.h"
|
|
|
2ff057 |
#include <stdlib.h>
|
|
|
2ff057 |
#include <rpm/rpmstring.h>
|
|
|
2ff057 |
#include <rpm/rpmlog.h>
|
|
|
2ff057 |
#include "lib/rpmchroot.h"
|
|
|
2ff057 |
#include "debug.h"
|
|
|
2ff057 |
|
|
|
2ff057 |
struct rootState_s {
|
|
|
2ff057 |
char *rootDir;
|
|
|
2ff057 |
int chrootDone;
|
|
|
2ff057 |
int cwd;
|
|
|
2ff057 |
};
|
|
|
2ff057 |
|
|
|
2ff057 |
/* Process global chroot state */
|
|
|
2ff057 |
static struct rootState_s rootState = {
|
|
|
2ff057 |
.rootDir = NULL,
|
|
|
2ff057 |
.chrootDone = 0,
|
|
|
2ff057 |
.cwd = -1,
|
|
|
2ff057 |
};
|
|
|
2ff057 |
|
|
|
2ff057 |
int rpmChrootSet(const char *rootDir)
|
|
|
2ff057 |
{
|
|
|
2ff057 |
int rc = 0;
|
|
|
2ff057 |
|
|
|
2ff057 |
/* Setting same rootDir again is a no-op and not an error */
|
|
|
2ff057 |
if (rootDir && rootState.rootDir && rstreq(rootDir, rootState.rootDir))
|
|
|
2ff057 |
return 0;
|
|
|
2ff057 |
|
|
|
2ff057 |
/* Resetting only permitted in neutral state */
|
|
|
2ff057 |
if (rootState.chrootDone != 0)
|
|
|
2ff057 |
return -1;
|
|
|
2ff057 |
|
|
|
2ff057 |
rootState.rootDir = _free(rootState.rootDir);
|
|
|
2ff057 |
if (rootState.cwd >= 0) {
|
|
|
2ff057 |
close(rootState.cwd);
|
|
|
2ff057 |
rootState.cwd = -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
if (rootDir != NULL) {
|
|
|
2ff057 |
rootState.rootDir = rstrdup(rootDir);
|
|
|
2ff057 |
rootState.cwd = open(".", O_RDONLY);
|
|
|
2ff057 |
if (rootState.cwd < 0) {
|
|
|
2ff057 |
rpmlog(RPMLOG_ERR, _("Unable to open current directory: %m\n"));
|
|
|
2ff057 |
rc = -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
return rc;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
int rpmChrootIn(void)
|
|
|
2ff057 |
{
|
|
|
2ff057 |
int rc = 0;
|
|
|
2ff057 |
|
|
|
2ff057 |
if (rootState.rootDir == NULL || rstreq(rootState.rootDir, "/"))
|
|
|
2ff057 |
return 0;
|
|
|
2ff057 |
|
|
|
2ff057 |
if (rootState.cwd < 0) {
|
|
|
2ff057 |
rpmlog(RPMLOG_ERR, _("%s: chroot directory not set\n"), __func__);
|
|
|
2ff057 |
return -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
/* "refcounted" entry to chroot */
|
|
|
2ff057 |
if (rootState.chrootDone > 0) {
|
|
|
2ff057 |
rootState.chrootDone++;
|
|
|
2ff057 |
} else if (rootState.chrootDone == 0) {
|
|
|
2ff057 |
if (chdir("/") == 0 && chroot(rootState.rootDir) == 0) {
|
|
|
2ff057 |
rootState.chrootDone = 1;
|
|
|
2ff057 |
} else {
|
|
|
2ff057 |
rpmlog(RPMLOG_ERR, _("Unable to change root directory: %m\n"));
|
|
|
2ff057 |
rc = -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
}
|
|
|
2ff057 |
return rc;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
int rpmChrootOut(void)
|
|
|
2ff057 |
{
|
|
|
2ff057 |
int rc = 0;
|
|
|
2ff057 |
if (rootState.rootDir == NULL || rstreq(rootState.rootDir, "/"))
|
|
|
2ff057 |
return 0;
|
|
|
2ff057 |
|
|
|
2ff057 |
if (rootState.cwd < 0) {
|
|
|
2ff057 |
rpmlog(RPMLOG_ERR, _("%s: chroot directory not set\n"), __func__);
|
|
|
2ff057 |
return -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
/* "refcounted" return from chroot */
|
|
|
2ff057 |
if (rootState.chrootDone > 1) {
|
|
|
2ff057 |
rootState.chrootDone--;
|
|
|
2ff057 |
} else if (rootState.chrootDone == 1) {
|
|
|
2ff057 |
if (chroot(".") == 0 && fchdir(rootState.cwd) == 0) {
|
|
|
2ff057 |
rootState.chrootDone = 0;
|
|
|
2ff057 |
} else {
|
|
|
2ff057 |
rpmlog(RPMLOG_ERR, _("Unable to restore root directory: %m\n"));
|
|
|
2ff057 |
rc = -1;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
}
|
|
|
2ff057 |
return rc;
|
|
|
2ff057 |
}
|
|
|
2ff057 |
|
|
|
2ff057 |
int rpmChrootDone(void)
|
|
|
2ff057 |
{
|
|
|
2ff057 |
return (rootState.chrootDone > 0);
|
|
|
2ff057 |
}
|