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/*
## Copyright 2009- ECMWF.
## This software is licensed under the terms of the Apache Licence version 2.0
## which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
## In applying this licence, ECMWF does not waive the privileges and immunities
## granted to it by virtue of its status as an intergovernmental organisation
## nor does it submit to any jurisdiction.
*
* Read stdin and create a session from it
*
* Read standard in, to a input file, forks a child process as a separate session
* and then run the shell using the input file. In the child process, we close
* standard out, and duplicate standard out as standard error. The next fopen()
* is then used as standard out/error. i.e output file.
*
# Build stand alone to test
gcc -g -Dlinux ecflow_standalone.c -o ecflow_standalone
# Create file exe.sh use in the test below.
cat > $(pwd)/exe.sh <<\!!
xxx="hello worlds from /home/ma/ma0"
#printenv
echo $SHELL
fred="ma0@ecmwf.int"
if [ '"module unload emos" "module unload fftw" "module unload grib_api" "module unload eccodes" "module unload git" "module unload python" "module unload metview"' != '' ] ; then
array_of_module_cleanup=("module unload emos" "module unload fftw" "module unload grib_api" "module unload eccodes" "module unload git" "module unload python" "module unload metview")
for module_cleanup_i in "${array_of_module_cleanup[@]}";do
echo "${module_cleanup_i}"
${module_cleanup_i}
done
echo $PATH
fi
@@
!!
# Both these tests must work.
ssh localhost $(pwd)/ecflow_standalone -s /bin/bash -o $(pwd)/out.txt < $(pwd)/exe.sh # EXPECT non empty out.txt, and mail
ssh localhost $(pwd)/ecflow_standalone -s /bin/bash -o $(pwd)/out.txt -i $(pwd)/exe.sh # EXPECT non empty out.txt, and mail
# Compare ecflow_standalone with standalone
/usr/local/apps/sms/bin/standalone -s /bin/bash -o $(pwd)/out1.txt < $(pwd)/exe.sh
meld out.txt out1.txt
# Make sure output of echo and module commands is shown
std=/usr/local/apps/sms/bin/standalone
ssh eurus.ecmwf.int $std -s /bin/bash -o $(pwd)/out.txt < $(pwd)/exe.sh # OK
ssh localhost $std -s /bin/bash -o $(pwd)/out.txt -i $(pwd)/exe.sh # OK
*
* Other test using:
* echo "xxx=\"hello worlds from $HOME\"\nfred=$USER" | ./ecflow_standalone -i in.txt -o out.txt
*
* in.txt
* xxx="hello worlds from /home/ma/ma0"
* fred=ma0
*
* out.txt
* + xxx='hello worlds from /home/ma/ma0'
* + fred=ma0
************************************o*************************************/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <limits.h> /* for PATH_MAX */
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif
#ifndef PATH_MAX /* Hurd */
#define PATH_MAX 1024
#endif
#define MAXLEN 1024 /* Maximum line length */
char *nameof(char *name) {
char *s;
int len = strlen(name);
for( s=name+len-1 ; len && *s != '/' ; len-- ) s--;
if(*s == '/') s++;
return s;
}
pid_t do_setsid(void) {
#if defined(linux) || defined(__APPLE__) || defined(__MACH__) || defined(hpux) || defined(solaris) || defined(SGI) || \
defined(SVR4) || defined(AIX) || defined(SYG) || defined(alpha) || defined(__NVCOMPILER)
return setsid();
#else
return setsid(0);
#endif
}
int main(int argc, char** argv)
{
char *infile = NULL; /* Temporary input file */
char *outfile= "/dev/null"; /* Output file (def /dev/null) */
char *shell= "/bin/sh"; /* default shell */
/* int keep_file=FALSE;*/ /* Flag to keep the input file */
FILE *input_fp; /* Temp to write the input file */
char buff[MAXLEN]; /* Temp buffer to read in lines */
char fname[PATH_MAX];
int option;
extern char *optarg; /* Needed for the getopt */
extern int optind;
signal(SIGCHLD,SIG_IGN);
while( (option=getopt(argc,argv,"i:o:s:")) != -1 )
switch( option ) {
case 'i':
infile = optarg;
/* keep_file = TRUE; */
break;
case 'o':
outfile = optarg;
break;
case 's':
shell = optarg;
if (shell == NULL) {
fprintf(stderr,"usage: %s [-i inputfile] -o [outputfile] -s shell # empty shell argument passed for -s\n",*argv);
exit(0);
}
break;
default:
fprintf(stderr,"usage: %s [-i inputfile] -o [outputfile]\n",*argv);
exit(0);
}
/* Copy standard input to infile */
if( !infile ) {
/* printf("!infile\n"); */
static char template[] = "/tmp/tmp_ecflowXXXXXX";
strcpy(fname, template); /* Copy template */
int fd = mkstemp(fname);
/* printf("input Filename is %s\n", fname); Print it for information */
infile = fname;
close(fd);
if (!(input_fp = fopen(infile, "w"))) {
perror("ecflow_standalone.c, temp file creation error");
exit(1);
}
while( fgets(buff, MAXLEN-1, stdin)) {
/* fprintf(stderr, "%s", buff); */
fputs(buff,input_fp);
}
}
else {
if( !(input_fp=fopen(infile,"r")) ) {
perror("STANDALONE-INPUT-FILE cannot open");
exit(1);
}
}
fclose(input_fp);
/* fork child process, closing the parent */
switch(fork()) {
case -1: perror(*argv); exit(1);
case 0: break; /* child */
default: exit(0); /* The parent exits */
}
/* close standard out,and make standard out a copy of standard error
* This is done so that very next fopen(), will be used as stdout/srderr for execl
*
* int dup2(int oldfd, int newfd);
* makes newfd be the copy of oldfd, closing newfd first if necessary
* */
close(2); /* close standard error in child */
FILE* fout = fopen(outfile,"w"); /* Open file for output and error, when running execl(..) */
dup2(2,1);
close(0); /* close standard in , in child */
/* make sure infile exists and is readable */
if( !(input_fp=fopen(infile,"r")) ) {
perror("STANDALONE-INPUT-FILE-FOR-SHELL");
exit(1);
}
/* fclose(input_fp); */
/* if( !keep_file ) unlink(infile);
for (n=3; n<65535 ;n++) fclose(n); */
/* create a new session from the child process */
if( do_setsid() == -1 )
{
perror("STANDALONE-SETSID");
exit(1);
}
execl(shell,nameof(shell),"-x",infile,(char *)0);
/* if( !keep_file ) unlink(infile); */
fclose(fout);
exit(1);
}
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