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redirect scriptlet stderr synchronously through alpm

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Fixes FS#18770, and hopefully an occasional deadlock in my frontend as well.
For simplicity it redirects all scriptlet output through SCRIPTLET_INFO, and
all callbacks in the child process have been replaced for thread-safety.

Signed-off-by: Jonathan Conder <j@skurvy.no-ip.org>
Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Jonathan Conder 2010-08-19 00:07:18 +12:00 committed by Dan McGee
parent d14a98db25
commit 0223a028e0
1 changed files with 55 additions and 36 deletions
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91
lib/libalpm/util.c
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@ -456,6 +456,7 @@ int _alpm_run_chroot(const char *root, const char *cmd)
{
char cwd[PATH_MAX];
pid_t pid;
int pipefd[2];
int restore_cwd = 0;
int retval = 0;
@ -479,6 +480,12 @@ int _alpm_run_chroot(const char *root, const char *cmd)
/* Flush open fds before fork() to avoid cloning buffers */
fflush(NULL);
if(pipe(pipefd) == -1) {
_alpm_log(PM_LOG_ERROR, _("could not create pipe (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
/* fork- parent and child each have seperate code blocks below */
pid = fork();
if(pid == -1) {
@ -488,55 +495,67 @@ int _alpm_run_chroot(const char *root, const char *cmd)
}
if(pid == 0) {
FILE *pipe;
/* this code runs for the child only (the actual chroot/exec) */
_alpm_log(PM_LOG_DEBUG, "chrooting in %s\n", root);
close(1);
close(2);
while(dup2(pipefd[1], 1) == -1 && errno == EINTR);
while(dup2(pipefd[1], 2) == -1 && errno == EINTR);
close(pipefd[0]);
close(pipefd[1]);
/* use fprintf instead of _alpm_log to send output through the parent */
if(chroot(root) != 0) {
_alpm_log(PM_LOG_ERROR, _("could not change the root directory (%s)\n"),
strerror(errno));
fprintf(stderr, _("could not change the root directory (%s)\n"), strerror(errno));
exit(1);
}
if(chdir("/") != 0) {
_alpm_log(PM_LOG_ERROR, _("could not change directory to / (%s)\n"),
strerror(errno));
fprintf(stderr, _("could not change directory to / (%s)\n"), strerror(errno));
exit(1);
}
umask(0022);
pipe = popen(cmd, "r");
if(!pipe) {
_alpm_log(PM_LOG_ERROR, _("call to popen failed (%s)\n"),
strerror(errno));
exit(1);
}
while(!feof(pipe)) {
char line[PATH_MAX];
if(fgets(line, PATH_MAX, pipe) == NULL)
break;
alpm_logaction("%s", line);
EVENT(handle->trans, PM_TRANS_EVT_SCRIPTLET_INFO, line, NULL);
}
retval = pclose(pipe);
exit(WEXITSTATUS(retval));
execl("/bin/sh", "sh", "-c", cmd, (char *) NULL);
fprintf(stderr, _("call to execl failed (%s)\n"), strerror(errno));
exit(1);
} else {
/* this code runs for the parent only (wait on the child) */
pid_t retpid;
int status;
do {
retpid = waitpid(pid, &status, 0);
} while(retpid == -1 && errno == EINTR);
if(retpid == -1) {
_alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"),
strerror(errno));
FILE *pipe;
close(pipefd[1]);
pipe = fdopen(pipefd[0], "r");
if(pipe == NULL) {
close(pipefd[0]);
retval = 1;
goto cleanup;
} else {
/* check the return status, make sure it is 0 (success) */
if(WIFEXITED(status)) {
_alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n");
if(WEXITSTATUS(status) != 0) {
_alpm_log(PM_LOG_ERROR, _("command failed to execute correctly\n"));
retval = 1;
}
while(!feof(pipe)) {
char line[PATH_MAX];
if(fgets(line, PATH_MAX, pipe) == NULL)
break;
alpm_logaction("%s", line);
EVENT(handle->trans, PM_TRANS_EVT_SCRIPTLET_INFO, line, NULL);
}
fclose(pipe);
}
while(waitpid(pid, &status, 0) == -1) {
if(errno != EINTR) {
_alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
}
/* report error from above after the child has exited */
if(retval != 0) {
_alpm_log(PM_LOG_ERROR, _("could not open pipe (%s)\n"), strerror(errno));
goto cleanup;
}
/* check the return status, make sure it is 0 (success) */
if(WIFEXITED(status)) {
_alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n");
if(WEXITSTATUS(status) != 0) {
_alpm_log(PM_LOG_ERROR, _("command failed to execute correctly\n"));
retval = 1;
}
}
}