source: MondoRescue/branches/2.2.10/mondo/src/common/libmondo-fork.c@ 2375

/* libmondo-fork.c
   $Id: libmondo-fork.c 2375 2009-09-09 10:00:56Z bruno $

- subroutines for handling forking/pthreads/etc.
*/


#include "my-stuff.h"
#include "mr_mem.h"
#include "mondostructures.h"
#include "libmondo-fork.h"
#include "libmondo-string-EXT.h"
#include "libmondo-gui-EXT.h"
#include "libmondo-files-EXT.h"
#include "libmondo-tools-EXT.h"
#include "lib-common-externs.h"

/*@unused@*/
//static char cvsid[] = "$Id: libmondo-fork.c 2375 2009-09-09 10:00:56Z bruno $";

extern t_bkptype g_backup_media_type;
extern bool g_text_mode;
extern char *MONDO_LOGFILE;

/* Reference to global bkpinfo */
extern struct s_bkpinfo *bkpinfo;
pid_t g_buffer_pid = 0;


/**
 * Call a program and retrieve its last line of output.
 * @param call The program to run.
 * @return The last line of its output.
 * @note The returned value points to static storage that will be overwritten with each call.
 */
char *call_program_and_get_last_line_of_output(char *call)
{
    /*@ buffers ***************************************************** */
    static char result[512];
    char *tmp = NULL;

    /*@ pointers **************************************************** */
    FILE *fin;

    /*@ initialize data ********************************************* */
    result[0] = '\0';

    /*@******************************************************************** */

    assert_string_is_neither_NULL_nor_zerolength(call);
    if ((fin = popen(call, "r"))) {
        for (mr_getline(tmp, fin); !feof(fin); mr_getline(tmp, fin)) {
            if (strlen(tmp) > 1) {
                strncpy(result, tmp, 511);
            }
            mr_free(tmp);
        }
        mr_free(tmp);
        paranoid_pclose(fin);
    } else {
        log_OS_error("Unable to popen call");
    }
    strip_spaces(result);
    return (result);
}






#define MONDO_POPMSG  "Your PC will not retract the CD tray automatically. Please call mondoarchive with the -m (manual CD tray) flag."

/**
 * Call mkisofs to create an ISO image.
 * @param bkpinfo The backup information structure. Fields used:
 * - @c bkpinfo->manual_cd_tray
 * - @c bkpinfo->backup_media_type
 * - @c bkpinfo->please_dont_eject_when_restoring
 * @param basic_call The call to mkisofs. May contain tokens that will be resolved to actual data. The tokens are:
 * - @c _ISO_ will become the ISO file (@p isofile)
 * - @c _CD#_ becomes the CD number (@p cd_no)
 * - @c _ERR_ becomes the logfile (@p g_logfile)
 * @param isofile Replaces @c _ISO_ in @p basic_call. Should probably be the ISO image to create (-o parameter to mkisofs).
 * @param cd_no Replaces @c _CD#_ in @p basic_call. Should probably be the CD number.
 * @param what_i_am_doing The action taking place (e.g. "Making ISO #1"). Used as the title of the progress dialog.
 * @return Exit code of @c mkisofs (0 is success, anything else indicates failure).
 */
int
eval_call_to_make_ISO(char *basic_call, char *isofile, int cd_no, char *what_i_am_doing) {

    /*@ int's  *** */
    int retval = 0;


    /*@ buffers      *** */
    char *midway_call = NULL;
    char *ultimate_call = NULL;
    char *tmp = NULL;
    char *incoming, *old_stderr; 
        
    char *cd_number_str = NULL;
    char *command = NULL;
    char *p;
    char *tmp1 = NULL;
    char *tmp2 = NULL;

/*@***********   End Variables ***************************************/

    log_msg(3, "Starting");
    assert(bkpinfo != NULL);
    assert_string_is_neither_NULL_nor_zerolength(isofile);
    malloc_string(incoming);
    malloc_string(old_stderr);

    incoming[0] = '\0';
    old_stderr[0] = '\0';

    if (bkpinfo->nfs_user) {
        mr_asprintf(tmp1, "su - %s -c \"%s\"", bkpinfo->nfs_user, basic_call);
    } else {
        mr_asprintf(tmp1, "%s", basic_call);
    }

    mr_asprintf(cd_number_str, "%d", cd_no);
    log_msg(4, "basic call = '%s'", tmp1);
    midway_call = resolve_naff_tokens(tmp1, isofile, "_ISO_");
    mr_free(tmp1);

    log_msg(4, "midway_call = '%s'", midway_call);
    tmp = resolve_naff_tokens(midway_call, cd_number_str, "_CD#_");
    mr_free(cd_number_str);
    mr_free(midway_call);

    log_msg(4, "tmp = '%s'", tmp);
    ultimate_call = resolve_naff_tokens(tmp, MONDO_LOGFILE, "_ERR_");
    mr_free(tmp);

    log_msg(4, "ultimate call = '%s'", ultimate_call);
    mr_asprintf(command, "%s >> %s", ultimate_call, MONDO_LOGFILE);
    mr_free(ultimate_call);

    log_to_screen
        ("Please be patient. Do not be alarmed by on-screen inactivity.");
    log_msg(4, "Calling open_evalcall_form() with what_i_am_doing='%s'",
            what_i_am_doing);
    if (bkpinfo->manual_cd_tray) {
        mr_asprintf(tmp2, "%s", command);
        p = strstr(tmp2, "2>>");
        if (p) {
            *p++ = ' ';
            *p++ = ' ';
            *p++ = ' ';
            while (*p == ' ') {
                p++;
            }
            for (; (*p != ' ') && (*p != '\0'); p++) {
                *p = ' ';
            }
        }
        mr_free(command);
        command = tmp2;
        if (!g_text_mode) {
            newtSuspend();
        }
        log_msg(1, "command = '%s'", command);
        retval += system(command);
        if (!g_text_mode) {
            newtResume();
        }
        if (retval) {
            popup_and_OK("mkisofs and/or cdrecord returned an error. CD was not created");
        }
    }
    /* if text mode then do the above & RETURN; if not text mode, do this... */
    else {
        log_msg(3, "command = '%s'", command);
        retval = run_external_binary_with_percentage_indicator_NEW(what_i_am_doing, command);
    }
    mr_free(command);
    paranoid_free(incoming);
    paranoid_free(old_stderr);
    return (retval);
}


/**
 * Call copy of data to create an USB image.
 * @param bkpinfo The backup information structure. Fields used:
 * - @c bkpinfo->backup_media_type
 * @return Exit code of @c copy (0 is success, anything else indicates failure).
 */
int
eval_call_to_make_USB(char *command, char *what_i_am_doing) {

    /*@ int's  *** */
    int retval = 0;


/*@***********   End Variables ***************************************/

    log_msg(3, "Starting");
    assert(bkpinfo != NULL);

    log_to_screen
        ("Please be patient. Do not be alarmed by on-screen inactivity.");
    log_msg(4, "Calling open_evalcall_form() with what_i_am_doing='%s'",
            what_i_am_doing);

    if (!g_text_mode) {
        newtSuspend();
    }
    log_msg(1, "command = '%s'", command);
    if (!g_text_mode) {
        retval = run_external_binary_with_percentage_indicator_NEW(what_i_am_doing, command);
    } else {
        retval += system(command);
    }
    if (!g_text_mode) {
        newtResume();
    }

    return (retval);
}




/**
 * Run a program and log its output (stdout and stderr) to the logfile.
 * @param program The program to run. Passed to the shell, so you can use pipes etc.
 * @param debug_level If @p g_loglevel is higher than this, do not log the output.
 * @return The exit code of @p program (depends on the command, but 0 almost always indicates success).
 */
int run_program_and_log_output(char *program, int debug_level)
{
    /*@ buffer ****************************************************** */
    char *callstr = NULL;
    char incoming[MAX_STR_LEN * 2];
    char *tmp1 = NULL;

    /*@ int ********************************************************* */
    int res;
    bool log_if_failure = FALSE;
    bool log_if_success = FALSE;

    /*@ pointers *************************************************** */
    FILE *fin;
    char *p;

    /*@ end vars *************************************************** */

    assert(program != NULL);
    if (!program[0]) {
        log_msg(2, "Warning - asked to run zerolength program");
        return (1);
    }

    if (debug_level <= g_loglevel) {
        log_if_success = TRUE;
        log_if_failure = TRUE;
    }
    mr_asprintf(callstr, "%s > %s/mondo-run-prog-thing.tmp 2> %s/mondo-run-prog-thing.err", program, bkpinfo->tmpdir, bkpinfo->tmpdir);
    while ((p = strchr(callstr, '\r'))) {
        *p = ' ';
    }
    while ((p = strchr(callstr, '\n'))) {
        *p = ' ';
    }                           /* single '=' is intentional */


    res = system(callstr);
    if (((res == 0) && log_if_success) || ((res != 0) && log_if_failure)) {
        log_msg(0, "running: %s", callstr);
        log_msg(0, "--------------------------------start of output-----------------------------");
    }
    mr_free(callstr);

    mr_asprintf(callstr, "cat %s/mondo-run-prog-thing.err >> %s/mondo-run-prog-thing.tmp 2> /dev/null", bkpinfo->tmpdir, bkpinfo->tmpdir);
    if (log_if_failure && system(callstr)) {
        log_OS_error("Command failed");
    }
    mr_free(callstr);

    mr_asprintf(tmp1, "%s/mondo-run-prog-thing.err", bkpinfo->tmpdir);
    unlink(tmp1);
    mr_free(tmp1);

    mr_asprintf(tmp1, "%s/mondo-run-prog-thing.tmp", bkpinfo->tmpdir);
    fin = fopen(tmp1, "r");
    if (fin) {
        for (fgets(incoming, MAX_STR_LEN, fin); !feof(fin); fgets(incoming, MAX_STR_LEN, fin)) {
            p = incoming;
            while (p && *p) {
                if ((p = strchr(p, '%'))) {
                    memmove(p, p + 1, strlen(p) + 1);
                    p += 2;
                }
            }
            strip_spaces(incoming);
            if ((res == 0 && log_if_success) || (res != 0 && log_if_failure)) {
                log_msg(0, incoming);
            }
        }
        paranoid_fclose(fin);
    }
    unlink(tmp1);
    mr_free(tmp1);

    if ((res == 0 && log_if_success) || (res != 0 && log_if_failure)) {
        log_msg(0,
                "--------------------------------end of output------------------------------");
        if (res) {
            log_msg(0, "...ran with res=%d", res);
        } else {
            log_msg(0, "...ran just fine. :-)");
        }
    }
    return (res);
}



/**
 * Run a program and log its output to the screen.
 * @param basic_call The program to run.
 * @param what_i_am_doing The title of the evalcall form.
 * @return The return value of the command (varies, but 0 almost always means success).
 * @see run_program_and_log_output
 * @see log_to_screen
 */
int run_program_and_log_to_screen(char *basic_call, char *what_i_am_doing)
{
    /*@ int ******************************************************** */
    int retval = 0;
    int res = 0;
    int i;

    /*@ pointers **************************************************** */
    FILE *fin;

    /*@ buffers **************************************************** */
    char *command = NULL;
    char *lockfile = NULL;

    /*@ end vars *************************************************** */

    assert_string_is_neither_NULL_nor_zerolength(basic_call);

    mr_asprintf(lockfile, "%s/mojo-jojo.bla.bla", bkpinfo->tmpdir);

    mr_asprintf(command, "echo hi > %s ; %s >> %s 2>> %s; res=$?; sleep 1; rm -f %s; exit $res", lockfile, basic_call, MONDO_LOGFILE, MONDO_LOGFILE, lockfile);
    open_evalcall_form(what_i_am_doing);
    log_msg(2, "Executing %s", basic_call);

    if (!(fin = popen(command, "r"))) {
        log_OS_error("Unable to popen-in command");
        log_to_screen("Failed utterly to call '%s'", command);
        mr_free(command);
        mr_free(lockfile);
        return (1);
    }
    mr_free(command);

    if (!does_file_exist(lockfile)) {
        log_to_screen("Waiting for external binary to start");
        for (i = 0; i < 60 && !does_file_exist(lockfile); sleep(1), i++) {
            log_msg(3, "Waiting for lockfile %s to exist", lockfile);
        }
    }

    for (; does_file_exist(lockfile); sleep(1)) {
        log_file_end_to_screen(MONDO_LOGFILE, "");
        update_evalcall_form(1);
    }

    /* Evaluate the status returned by pclose to get the exit code of the called program. */
    errno = 0;
    res = pclose(fin);
    /* Log actual pclose errors. */
    if (errno) log_msg(5, "pclose err: %d", errno);
    /* Check if we have a valid status. If we do, extract the called program's exit code. */
    /* If we don't, highlight this fact by returning -1. */
    if (WIFEXITED(res)) {
        retval = WEXITSTATUS(res);
    } else {
        retval = -1;
    }
    close_evalcall_form();
    unlink(lockfile);
    mr_free(lockfile);

    return (retval);
}




/**
 * Apparently unused. @bug This has a purpose, but what?
 */
#define PIMP_START_SZ "STARTSTARTSTART9ff3kff9a82gv34r7fghbkaBBC2T231hc81h42vws8"
#define PIMP_END_SZ "ENDENDEND0xBBC10xBBC2T231hc81h42vws89ff3kff9a82gv34r7fghbka"




int copy_from_src_to_dest(FILE * f_orig, FILE * f_archived, char direction)
{
// if dir=='w' then copy from orig to archived
// if dir=='r' then copy from archived to orig
    char *tmp = NULL;
    char *tmp1 = NULL;
    char *buf = NULL;
    char *filestr = NULL;
    long int bytes_to_be_read, bytes_read_in, bytes_written_out =
        0, bufcap, subsliceno = 0;
    int retval = 0;
    FILE *fin;
    FILE *fout;
    FILE *ftmp;
    int tmpcap = 512;

    log_msg(5, "Opening.");

    bufcap = 256L * 1024L;
    if (!(buf = malloc(bufcap))) {
        fatal_error("Failed to malloc() buf");
    }

    if (direction == 'w') {
        fin = f_orig;
        fout = f_archived;
        mr_asprintf(tmp, "%-64s", PIMP_START_SZ);
        if (fwrite(tmp, 1, 64, fout) != 64) {
            mr_free(tmp);
            fatal_error("Can't write the introductory block");
        }
        mr_free(tmp);

        while (1) {
            bytes_to_be_read = bytes_read_in = fread(buf, 1, bufcap, fin);
            if (bytes_read_in == 0) {
                break;
            }
            mr_asprintf(tmp, "%-64ld", bytes_read_in);
            if (fwrite(tmp, 1, 64, fout) != 64) {
                mr_free(tmp);
                fatal_error("Cannot write introductory block");
            }
            mr_free(tmp);

            log_msg(7,
                    "subslice #%ld --- I have read %ld of %ld bytes in from f_orig",
                    subsliceno, bytes_read_in, bytes_to_be_read);
            bytes_written_out += fwrite(buf, 1, bytes_read_in, fout);
            mr_asprintf(tmp, "%-64ld", subsliceno);
            if (fwrite(tmp, 1, 64, fout) != 64) {
                mr_free(tmp);
                fatal_error("Cannot write post-thingy block");
            }
            mr_free(tmp);
            log_msg(7, "Subslice #%d written OK", subsliceno);
            subsliceno++;
        }
        mr_asprintf(tmp, "%-64ld", 0L);
        if (fwrite(tmp, 1, 64L, fout) != 64L) {
            mr_free(tmp);
            fatal_error("Cannot write final introductory block");
        }
        mr_free(tmp);

        mr_asprintf(tmp, "%-64s", PIMP_END_SZ);
        if (fwrite(tmp, 1, 64, fout) != 64) {
            mr_free(tmp);
            fatal_error("Can't write the final block");
        }
        mr_free(tmp);
    } else {
        fin = f_archived;
        fout = f_orig;
        if (!(tmp1 = malloc(tmpcap))) {
            fatal_error("Failed to malloc() tmp");
        }
        if (fread(tmp1, 1, 64L, fin) != 64L) {
            mr_free(tmp1);
            fatal_error("Cannot read the introductory block");
        }
        log_msg(5, "tmp1 is %s", tmp1);
        if (!strstr(tmp1, PIMP_START_SZ)) {
            mr_free(tmp1);
            fatal_error("Can't find intro blk");
        }
        if (fread(tmp1, 1, 64L, fin) != 64L) {
            mr_free(tmp1);
            fatal_error("Cannot read introductory blk");
        }
        bytes_to_be_read = atol(tmp1);
        while (bytes_to_be_read > 0) {
            log_msg(7, "subslice#%ld, bytes=%ld", subsliceno, bytes_to_be_read);
            bytes_read_in = fread(buf, 1, bytes_to_be_read, fin);
            if (bytes_read_in != bytes_to_be_read) {
                mr_free(tmp1);
                fatal_error("Danger, WIll Robinson. Failed to read whole subvol from archives.");
            }
            bytes_written_out += fwrite(buf, 1, bytes_read_in, fout);
            if (fread(tmp1, 1, 64, fin) != 64) {
                mr_free(tmp1);
                fatal_error("Cannot read post-thingy block");
            }
            if (atol(tmp1) != subsliceno) {
                log_msg(1, "Wanted subslice %ld but got %ld ('%s')", subsliceno, atol(tmp1), tmp1);
            }
            log_msg(7, "Subslice #%ld read OK", subsliceno);
            subsliceno++;
            if (fread(tmp1, 1, 64, fin) != 64) {
                mr_free(tmp1);
                fatal_error("Cannot read introductory block");
            }
            bytes_to_be_read = atol(tmp1);
        }
        log_msg(1, "tmpA is %s", tmp1);
        if (!strstr(tmp1, PIMP_END_SZ)) {
            if (fread(tmp1, 1, 64, fin) != 64) {
                mr_free(tmp1);
                fatal_error("Can't read the final block");
            }
            log_msg(5, "tmpB is %s", tmp1);
            if (!strstr(tmp1, PIMP_END_SZ)) {
                mr_asprintf(filestr, "%s/out.leftover", bkpinfo->tmpdir);
                ftmp = fopen(filestr, "w");
                mr_free(filestr);

                bytes_read_in = fread(tmp1, 1, 64, fin);
                log_msg(1, "bytes_read_in = %ld", bytes_read_in);

                fwrite(tmp1, 1, bytes_read_in, ftmp);
                fread(tmp1, 1, tmpcap, fin);
                log_msg(0, "tmp1 = '%s'", tmp1);
                fwrite(tmp1, 1, tmpcap, ftmp);
                fclose(ftmp);
                mr_free(tmp1);
                fatal_error("Missing terminating block");
            }
        }
        mr_free(tmp1);
    }

    paranoid_free(buf);
    log_msg(3, "Successfully copied %ld bytes", bytes_written_out);
    return (retval);
}




/**
 * Feed @p input_device through ntfsclone to @p output_fname.
 * @param input_device The device to image.
 * @param output_fname The file to write.
 * @return 0 for success, nonzero for failure.
 */
int feed_into_ntfsprog(char *input_device, char *output_fname)
{
// BACKUP
    int res = -1;
    char *command = NULL;

    if (!does_file_exist(input_device)) {
        fatal_error("input device does not exist");
    }
    command = find_home_of_exe("ntfsclone");
    if (!command) {
        mr_free(command);
        fatal_error("ntfsclone not found");
    }
    mr_free(command);

    mr_asprintf(command, "ntfsclone --force --save-image --overwrite %s %s", output_fname, input_device);
    res = run_program_and_log_output(command, 5);
    mr_free(command);

    unlink(output_fname);
    return (res);
}


void *run_prog_in_bkgd_then_exit(void *info)
{
    char *sz_command;
    static int res = 4444;

    res = 999;
    sz_command = (char *) info;
    log_msg(4, "sz_command = '%s'", sz_command);
    res = system(sz_command);
    if (res > 256 && res != 4444) {
        res = res / 256;
    }
    log_msg(4, "child res = %d", res);
    sz_command[0] = '\0';
    pthread_exit((void *) (&res));
}




int run_external_binary_with_percentage_indicator_NEW(char *tt, char *cmd) {

    /*@ int *************************************************************** */
    int res = 0;
    int percentage = 0;
    int maxpc = 100;
    int pcno = 0;
    int last_pcno = 0;
    int counter = 0;

    /*@ buffers *********************************************************** */
    char *command = NULL;
    char *title = NULL;
    /*@ pointers ********************************************************** */
    static int chldres = 0;
    int *pchild_result;
    pthread_t childthread;

    pchild_result = &chldres;
    assert_string_is_neither_NULL_nor_zerolength(cmd);
    assert_string_is_neither_NULL_nor_zerolength(tt);
    *pchild_result = 999;

    mr_asprintf(command, "%s 2>> %s", cmd, MONDO_LOGFILE);
    log_msg(3, "command = '%s'", command);
    if ((res = pthread_create(&childthread, NULL, run_prog_in_bkgd_then_exit, (void *) command))) {
        fatal_error("Unable to create an archival thread");
    }

    log_msg(8, "Parent running");
    mr_asprintf(title, "%s", tt);
    open_evalcall_form(title);
    mr_free(title);

    for (sleep(1); command[0] != '\0'; sleep(1)) {
        pcno = grab_percentage_from_last_line_of_file(MONDO_LOGFILE);
        if (pcno < 0 || pcno > 100) {
            log_msg(8, "Weird pc# %d", pcno);
            continue;
        }
        percentage = pcno * 100 / maxpc;
        if (pcno <= 5 && last_pcno >= 40) {
            close_evalcall_form();
            mr_asprintf(title, "Verifying...");
            open_evalcall_form(title);
            mr_free(title);
        }
        if (counter++ >= 5) {
            counter = 0;
            log_file_end_to_screen(MONDO_LOGFILE, "");
        }
        last_pcno = pcno;
        update_evalcall_form(percentage);
    }
    mr_free(command);

    log_file_end_to_screen(MONDO_LOGFILE, "");
    close_evalcall_form();
    pthread_join(childthread, (void *) (&pchild_result));
    if (pchild_result) {
        res = *pchild_result;
    } else {
        res = 666;
    }
    log_msg(3, "Parent res = %d", res);
    return (res);
}


/**
 * Feed @p input_fifo through ntfsclone (restore) to @p output_device.
 * @param input_fifo The ntfsclone file to read.
 * @param output_device Where to put the output.
 * @return The return value of ntfsclone (0 for success).
 */
int feed_outfrom_ntfsprog(char *output_device, char *input_fifo)
{
// RESTORE
    int res = -1;
    char *command = NULL;

    command = find_home_of_exe("ntfsclone");
    if (!command) {
        mr_free(command);
        fatal_error("ntfsclone not found");
    }
    mr_free(command);

    mr_asprintf(command, "ntfsclone --force --restore-image --overwrite %s %s", output_device, input_fifo);
    res = run_program_and_log_output(command, 5);
    mr_free(command);
    return (res);
}