source: MondoRescue/branches/2.05/mondo/mondo/common/libmondo-fork.c @ 128

/* libmondo-fork.c
   $Id: libmondo-fork.c 128 2005-11-19 01:27:41Z bcornec $

- subroutines for handling forking/pthreads/etc.


06/20/2004
- create fifo /var/log/partimagehack-debug.log and empty it
  to keep ramdisk from filling up

04/13/2004
- >= should be <= g_loglevel

11/15/2003
- changed a few []s to char*s
  
10/12
- rewrote partimagehack handling (multiple fifos, chunks, etc.)

10/11
- partimagehack now has debug level of N (set in my-stuff.h)

10/08
- call to partimagehack when restoring will now log errors to /var/log/....log

10/06
- cleaned up logging a bit

09/30
- line 735 - missing char* cmd in sprintf()

09/28
- added run_external_binary_with_percentage_indicator()
- rewritten eval_call_to_make_ISO()

09/18
- call mkstemp instead of mktemp

09/13
- major NTFS hackage

09/12
- paranoid_system("rm -f /tmp/ *PARTIMAGE*") before calling partimagehack

09/11
- forward-ported unbroken feed_*_partimage() subroutines
  from early August 2003

09/08
- detect & use partimagehack if it exists

09/05
- finally finished partimagehack hack :)

07/04
- added subroutines to wrap around partimagehack

04/27
- don't echo (...res=%d...) at end of log_it()
  unnecessarily
- replace newtFinished() and newtInit() with
  newtSuspend() and newtResume()

04/24
- added some assert()'s and log_OS_error()'s

04/09
- cleaned up run_program_and_log_output()

04/07
- cleaned up code a bit
- let run_program_and_log_output() accept -1 (only log if _no error_)

01/02/2003
- in eval_call_to_make_ISO(), append output to MONDO_LOGFILE
  instead of a temporary stderr text file

12/10
- patch by Heiko Schlittermann to handle % chars in issue.net

11/18
- if mkisofs in eval_call_to_make_ISO() returns an error then return it,
  whether ISO was created or not

10/30
- if mkisofs in eval_call_to_make_ISO() returns an error then find out if
  the output (ISO) file has been created; if it has then return 0 anyway

08/01 - 09/30
- run_program_and_log_output() now takes boolean operator to specify
  whether it will log its activities in the event of _success_
- system() now includes 2>/dev/null
- enlarged some tmp[]'s
- added run_program_and_log_to_screen() and run_program_and_log_output()

07/24
- created
*/


#include "my-stuff.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 128 2005-11-19 01:27:41Z bcornec $";

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

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

    /*@ initialize data ********************************************* */
    malloc_string(tmp);
    result[0] = '\0';
    tmp[0] = '\0';

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

    assert_string_is_neither_NULL_nor_zerolength(call);
    if ((fin = popen(call, "r"))) {
        for (fgets(tmp, MAX_STR_LEN, fin); !feof(fin);
             fgets(tmp, MAX_STR_LEN, fin)) {
            if (strlen(tmp) > 1) {
                strcpy(result, 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 logstub Unused.
 * @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).
 * @bug @p logstub is unused.
 */
int
eval_call_to_make_ISO(struct s_bkpinfo *bkpinfo,
                      char *basic_call, char *isofile,
                      int cd_no, char *logstub, char *what_i_am_doing)
{

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


    /*@ buffers      *** */
    char *midway_call, *ultimate_call, *tmp, *command, *incoming,
        *old_stderr, *cd_number_str;
    char *p;

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

    log_msg(3, "Starting");
    assert(bkpinfo != NULL);
    assert_string_is_neither_NULL_nor_zerolength(basic_call);
    assert_string_is_neither_NULL_nor_zerolength(isofile);
    assert_string_is_neither_NULL_nor_zerolength(logstub);
    if (!(midway_call = malloc(1200))) {
        fatal_error("Cannot malloc midway_call");
    }
    if (!(ultimate_call = malloc(1200))) {
        fatal_error("Cannot malloc ultimate_call");
    }
    if (!(tmp = malloc(1200))) {
        fatal_error("Cannot malloc tmp");
    }
    if (!(command = malloc(1200))) {
        fatal_error("Cannot malloc command");
    }
    malloc_string(incoming);
    malloc_string(old_stderr);
    malloc_string(cd_number_str);

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

    sprintf(cd_number_str, "%d", cd_no);
    resolve_naff_tokens(midway_call, basic_call, isofile, "_ISO_");
    resolve_naff_tokens(tmp, midway_call, cd_number_str, "_CD#_");
    resolve_naff_tokens(ultimate_call, tmp, MONDO_LOGFILE, "_ERR_");
    log_msg(4, "basic call = '%s'", basic_call);
    log_msg(4, "midway_call = '%s'", midway_call);
    log_msg(4, "tmp = '%s'", tmp);
    log_msg(4, "ultimate call = '%s'", ultimate_call);
    sprintf(command, "%s >> %s", ultimate_call, MONDO_LOGFILE);

    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);
    strcpy(tmp, command);
    if (bkpinfo->manual_cd_tray) {
        p = strstr(tmp, "2>>");
        if (p) {
            sprintf(p, "   ");
            while (*p == ' ') {
                p++;
            }
            for (; *p != ' '; p++) {
                *p = ' ';
            }
        }
        strcpy(command, tmp);
#ifndef _XWIN
        if (!g_text_mode) {
            newtSuspend();
        }
#endif
        log_msg(1, "command = '%s'", command);
        retval += system(command);
        if (!g_text_mode) {
            newtResume();
        }
        if (retval) {
            log_msg(2, "Basic call '%s' returned an error.", basic_call);
            popup_and_OK("Press ENTER to continue.");
            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);
//      yes_this_is_a_goto:
        retval =
            run_external_binary_with_percentage_indicator_NEW
            (what_i_am_doing, command);
    }

    paranoid_free(midway_call);
    paranoid_free(ultimate_call);
    paranoid_free(tmp);
    paranoid_free(command);
    paranoid_free(incoming);
    paranoid_free(old_stderr);
    paranoid_free(cd_number_str);
/*
  if (bkpinfo->backup_media_type == dvd && !bkpinfo->please_dont_eject_when_restoring)
    {
      log_msg(3, "Ejecting DVD device");
      eject_device(bkpinfo->media_device);
    }
*/
    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[MAX_STR_LEN * 2];
    char incoming[MAX_STR_LEN * 2];
    char tmp[MAX_STR_LEN * 2];
    char initial_label[MAX_STR_LEN * 2];

    /*@ int ********************************************************* */
    int res;
    int i;
    int len;
    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 == TRUE) { debug_level=5; }

    //  assert_string_is_neither_NULL_nor_zerolength(program);

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


    len = (int) strlen(program);
    for (i = 0; i < 35 - len / 2; i++) {
        tmp[i] = '-';
    }
    tmp[i] = '\0';
    strcat(tmp, " ");
    strcat(tmp, program);
    strcat(tmp, " ");
    for (i = 0; i < 35 - len / 2; i++) {
        strcat(tmp, "-");
    }
    strcpy(initial_label, tmp);
    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-----------------------------");
    }
    if (log_if_failure
        &&
        system
        ("cat /tmp/mondo-run-prog-thing.err >> /tmp/mondo-run-prog-thing.tmp 2> /dev/null"))
    {
        log_OS_error("Command failed");
    }
    unlink("/tmp/mondo-run-prog-thing.err");
    fin = fopen("/tmp/mondo-run-prog-thing.tmp", "r");
    if (fin) {
        for (fgets(incoming, MAX_STR_LEN, fin); !feof(fin);
             fgets(incoming, MAX_STR_LEN, fin)) {
            /* patch by Heiko Schlittermann */
            p = incoming;
            while (p && *p) {
                if ((p = strchr(p, '%'))) {
                    memmove(p, p + 1, strlen(p) + 1);
                    p += 2;
                }
            }
            /* end of patch */
            strip_spaces(incoming);
            if ((res == 0 && log_if_success)
                || (res != 0 && log_if_failure)) {
                log_msg(0, incoming);
            }
        }
        paranoid_fclose(fin);
    }
    unlink("/tmp/mondo-run-prog-thing.tmp");
    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. :-)");
        }
    }
//  else
//    { log_msg (0, "-------------------------------ran w/ res=%d------------------------------", res); }
    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 tmp[MAX_STR_LEN * 2];
    char command[MAX_STR_LEN * 2];
    char lockfile[MAX_STR_LEN];

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

    assert_string_is_neither_NULL_nor_zerolength(basic_call);

    sprintf(lockfile, "/tmp/mojo-jojo.blah.XXXXXX");
    mkstemp(lockfile);
    sprintf(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);
    sprintf(tmp, "Executing %s", basic_call);
    log_msg(2, tmp);
    if (!(fin = popen(command, "r"))) {
        log_OS_error("Unable to popen-in command");
        sprintf(tmp, "Failed utterly to call '%s'", command);
        log_to_screen(tmp);
        return (1);
    }
    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);
        }
    }
#ifdef _XWIN
    /* This only can update when newline goes into the file,
       but it's *much* prettier/faster on Qt. */
    while (does_file_exist(lockfile)) {
        while (!feof(fin)) {
            if (!fgets(tmp, 512, fin))
                break;
            log_to_screen(tmp);
        }
        usleep(500000);
    }
#else
    /* This works on Newt, and it gives quicker updates. */
    for (; does_file_exist(lockfile); sleep(1)) {
        log_file_end_to_screen(MONDO_LOGFILE, "");
        update_evalcall_form(1);
    }
#endif
    paranoid_pclose(fin);
    retval += res;
    close_evalcall_form();
    unlink(lockfile);
    return (retval);
}





/**
 * Thread callback to run a command (partimage) in the background.
 * @param xfb A transfer block of @c char, containing:
 * - xfb:[0] A marker, should be set to 2. Decremented to 1 while the command is running and 0 when it's finished.
 * - xfb:[1] The command's return value, if xfb:[0] is 0.
 * - xfb+2:  A <tt>NULL</tt>-terminated string containing the command to be run.
 * @return NULL to pthread_join.
 */
void *call_partimage_in_bkgd(void *xfb)
{
    char *transfer_block;
    int retval = 0;

    g_buffer_pid = getpid();
    unlink("/tmp/null");
    log_msg(1, "starting");
    transfer_block = (char *) xfb;
    transfer_block[0]--;        // should now be 1
    retval = system(transfer_block + 2);
    if (retval) {
        log_OS_error("partimage returned an error");
    }
    transfer_block[1] = retval;
    transfer_block[0]--;        // should now be 0
    g_buffer_pid = 0;
    log_msg(1, "returning");
    pthread_exit(NULL);
}


/**
 * File to touch if we want partimage to wait for us.
 */
#define PAUSE_PARTIMAGE_FNAME "/tmp/PAUSE-PARTIMAGE-FOR-MONDO"

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

/**
 * Marker to start the next subvolume for Partimage.
 */
#define NEXT_SUBVOL_PLEASE "I-grew-up-on-the-crime-side,-the-New-York-Times-side,-where-staying-alive-was-no-jive"

/**
 * Marker to end the partimage file.
 */
#define NO_MORE_SUBVOLS "On-second-hand,momma-bounced-on-old-man,-and-so-we-moved-to-Shaolin-Land."

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;
    char *buf;
    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;

    log_msg(5, "Opening.");
    malloc_string(tmp);
    tmp[0] = '\0';
    bufcap = 256L * 1024L;
    if (!(buf = malloc(bufcap))) {
        fatal_error("Failed to malloc() buf");
    }

    if (direction == 'w') {
        fin = f_orig;
        fout = f_archived;
        sprintf(tmp, "%-64s", PIMP_START_SZ);
        if (fwrite(tmp, 1, 64, fout) != 64) {
            fatal_error("Can't write the introductory block");
        }
        while (1) {
            bytes_to_be_read = bytes_read_in = fread(buf, 1, bufcap, fin);
            if (bytes_read_in == 0) {
                break;
            }
            sprintf(tmp, "%-64ld", bytes_read_in);
            if (fwrite(tmp, 1, 64, fout) != 64) {
                fatal_error("Cannot write introductory block");
            }
            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);
            sprintf(tmp, "%-64ld", subsliceno);
            if (fwrite(tmp, 1, 64, fout) != 64) {
                fatal_error("Cannot write post-thingy block");
            }
            log_msg(7, "Subslice #%d written OK", subsliceno);
            subsliceno++;
        }
        sprintf(tmp, "%-64ld", 0L);
        if (fwrite(tmp, 1, 64L, fout) != 64L) {
            fatal_error("Cannot write final introductory block");
        }
    } else {
        fin = f_archived;
        fout = f_orig;
        if (fread(tmp, 1, 64L, fin) != 64L) {
            fatal_error("Cannot read the introductory block");
        }
        log_msg(5, "tmp is %s", tmp);
        if (!strstr(tmp, PIMP_START_SZ)) {
            fatal_error("Can't find intro blk");
        }
        if (fread(tmp, 1, 64L, fin) != 64L) {
            fatal_error("Cannot read introductory blk");
        }
        bytes_to_be_read = atol(tmp);
        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) {
                fatal_error
                    ("Danger, WIll Robinson. Failed to read whole subvol from archives.");
            }
            bytes_written_out += fwrite(buf, 1, bytes_read_in, fout);
            if (fread(tmp, 1, 64, fin) != 64) {
                fatal_error("Cannot read post-thingy block");
            }
            if (atol(tmp) != subsliceno) {
                log_msg(1, "Wanted subslice %ld but got %ld ('%s')",
                        subsliceno, atol(tmp), tmp);
            }
            log_msg(7, "Subslice #%ld read OK", subsliceno);
            subsliceno++;
            if (fread(tmp, 1, 64, fin) != 64) {
                fatal_error("Cannot read introductory block");
            }
            bytes_to_be_read = atol(tmp);
        }
    }

//  log_msg(4, "Written %ld of %ld bytes", bytes_written_out, bytes_read_in);

    if (direction == 'w') {
        sprintf(tmp, "%-64s", PIMP_END_SZ);
        if (fwrite(tmp, 1, 64, fout) != 64) {
            fatal_error("Can't write the final block");
        }
    } else {
        log_msg(1, "tmpA is %s", tmp);
        if (!strstr(tmp, PIMP_END_SZ)) {
            if (fread(tmp, 1, 64, fin) != 64) {
                fatal_error("Can't read the final block");
            }
            log_msg(5, "tmpB is %s", tmp);
            if (!strstr(tmp, PIMP_END_SZ)) {
                ftmp = fopen("/tmp/out.leftover", "w");
                bytes_read_in = fread(tmp, 1, 64, fin);
                log_msg(1, "bytes_read_in = %ld", bytes_read_in);
//      if (bytes_read_in!=128+64) { fatal_error("Can't read the terminating block"); }
                fwrite(tmp, 1, bytes_read_in, ftmp);
                sprintf(tmp, "I am here - %ld", ftell(fin));
//    log_msg(0, tmp);
                fread(tmp, 1, 512, fin);
                log_msg(0, "tmp = '%s'", tmp);
                fwrite(tmp, 1, 512, ftmp);
                fclose(ftmp);
                fatal_error("Missing terminating block");
            }
        }
    }

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


/**
 * Call partimage from @p input_device to @p output_fname.
 * @param input_device The device to read.
 * @param output_fname The file to write.
 * @return 0 for success, nonzero for failure.
 */
int dynamically_create_pipes_and_copy_from_them_to_output_file(char
                                                               *input_device,
                                                               char
                                                               *output_fname)
{
    char *curr_fifo;
    char *prev_fifo;
    char *next_fifo;
    char *command;
    char *sz_call_to_partimage;
    int fifo_number = 0;
    struct stat buf;
    pthread_t partimage_thread;
    int res = 0;
    char *tmpstub;
    FILE *fout;
    FILE *fin;
    char *tmp;

    malloc_string(tmpstub);
    malloc_string(curr_fifo);
    malloc_string(prev_fifo);
    malloc_string(next_fifo);
    malloc_string(command);
    malloc_string(sz_call_to_partimage);
    malloc_string(tmp);

    log_msg(1, "g_tmpfs_mountpt = %s", g_tmpfs_mountpt);
    if (g_tmpfs_mountpt && g_tmpfs_mountpt[0]
        && does_file_exist(g_tmpfs_mountpt)) {
        strcpy(tmpstub, g_tmpfs_mountpt);
    } else {
        strcpy(tmpstub, "/tmp");
    }
    paranoid_system("rm -f /tmp/*PARTIMAGE*");
    sprintf(command, "rm -Rf %s/pih-fifo-*", tmpstub);
    paranoid_system(command);
    sprintf(tmpstub + strlen(tmpstub), "/pih-fifo-%ld",
            (long int) random());
    mkfifo(tmpstub, S_IRWXU | S_IRWXG); // never used, though...
    sprintf(curr_fifo, "%s.%03d", tmpstub, fifo_number);
    sprintf(next_fifo, "%s.%03d", tmpstub, fifo_number + 1);
    mkfifo(curr_fifo, S_IRWXU | S_IRWXG);
    mkfifo(next_fifo, S_IRWXU | S_IRWXG);   // make sure _next_ fifo already exists before we call partimage
    sz_call_to_partimage[0] = 2;
    sz_call_to_partimage[1] = 0;
    sprintf(sz_call_to_partimage + 2,
            "partimagehack " PARTIMAGE_PARAMS
            " save %s %s > /tmp/stdout 2> /tmp/stderr", input_device,
            tmpstub);
    log_msg(5, "curr_fifo   = %s", curr_fifo);
    log_msg(5, "next_fifo   = %s", next_fifo);
    log_msg(5, "sz_call_to_partimage call is '%s'",
            sz_call_to_partimage + 2);
    if (!lstat(output_fname, &buf) && S_ISREG(buf.st_mode)) {
        log_msg(5, "Deleting %s", output_fname);
        unlink(output_fname);
    }
    if (!(fout = fopen(output_fname, "w"))) {
        fatal_error("Unable to openout to output_fname");
    }
    res =
        pthread_create(&partimage_thread, NULL, call_partimage_in_bkgd,
                       (void *) sz_call_to_partimage);
    if (res) {
        fatal_error("Failed to create thread to call partimage");
    }
    log_msg(1, "Running fore/back at same time");
    log_to_screen("Working with partimagehack...");
    while (sz_call_to_partimage[0] > 0) {
        sprintf(tmp, "%s\n", NEXT_SUBVOL_PLEASE);
        if (fwrite(tmp, 1, 128, fout) != 128) {
            fatal_error("Cannot write interim block");
        }
        log_msg(5, "fifo_number=%d", fifo_number);
        log_msg(4, "Cat'ting %s", curr_fifo);
        if (!(fin = fopen(curr_fifo, "r"))) {
            fatal_error("Unable to openin from fifo");
        }
//      if (!sz_call_to_partimage[0]) { break; }
        log_msg(5, "Deleting %s", prev_fifo);
        unlink(prev_fifo);      // just in case
        copy_from_src_to_dest(fin, fout, 'w');
        paranoid_fclose(fin);
        fifo_number++;
        strcpy(prev_fifo, curr_fifo);
        strcpy(curr_fifo, next_fifo);
        log_msg(5, "Creating %s", next_fifo);
        sprintf(next_fifo, "%s.%03d", tmpstub, fifo_number + 1);
        mkfifo(next_fifo, S_IRWXU | S_IRWXG);   // make sure _next_ fifo exists before we cat this one
        system("sync");
        sleep(5);
    }
    sprintf(tmp, "%s\n", NO_MORE_SUBVOLS);
    if (fwrite(tmp, 1, 128, fout) != 128) {
        fatal_error("Cannot write interim block");
    }
    if (fwrite(tmp, 1, 128, fout) != 128) {
        fatal_error("Cannot write interim block");
    }
    if (fwrite(tmp, 1, 128, fout) != 128) {
        fatal_error("Cannot write interim block");
    }
    if (fwrite(tmp, 1, 128, fout) != 128) {
        fatal_error("Cannot write interim block");
    }
    paranoid_fclose(fout);
    log_to_screen("Cleaning up after partimagehack...");
    log_msg(3, "Final fifo_number=%d", fifo_number);
    paranoid_system("sync");
    unlink(next_fifo);
    unlink(curr_fifo);
    unlink(prev_fifo);
    log_to_screen("Finished cleaning up.");

//  if (!lstat(sz_wait_for_this_file, &statbuf))
//    { log_msg(3, "WARNING! %s was not processed.", sz_wait_for_this_file); }
    log_msg(2, "Waiting for pthread_join() to join.");
    pthread_join(partimage_thread, NULL);
    res = sz_call_to_partimage[1];
    log_msg(2, "pthread_join() joined OK.");
    log_msg(1, "Partimagehack(save) returned %d", res);
    unlink(tmpstub);
    paranoid_free(curr_fifo);
    paranoid_free(prev_fifo);
    paranoid_free(next_fifo);
    paranoid_free(tmpstub);
    paranoid_free(tmp);
    paranoid_free(command);
    return (res);
}


/**
 * Feed @p input_device through partimage 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_partimage(char *input_device, char *output_fname)
{
// BACKUP
    int res;

    if (!does_file_exist(input_device)) {
        fatal_error("input device does not exist");
    }
    if (!find_home_of_exe("partimagehack")) {
        fatal_error("partimagehack not found");
    }
    res =
        dynamically_create_pipes_and_copy_from_them_to_output_file
        (input_device, output_fname);
    return (res);
}





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

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

    /*@ buffers *********************************************************** */
    char *command;
    char *tempfile;
    char *title;
    /*@ pointers ********************************************************** */
    FILE *pin;

    malloc_string(title);
    malloc_string(command);
    malloc_string(tempfile);
    assert_string_is_neither_NULL_nor_zerolength(cmd);
    assert_string_is_neither_NULL_nor_zerolength(title);

    strcpy(title, tt);
    strcpy(tempfile,
           call_program_and_get_last_line_of_output
           ("mktemp -q /tmp/mondo.XXXXXXXX"));
    sprintf(command, "%s >> %s 2>> %s; rm -f %s", cmd, tempfile, tempfile,
            tempfile);
    log_msg(3, command);
    open_evalcall_form(title);
    if (!(pin = popen(command, "r"))) {
        log_OS_error("fmt err");
        return (1);
    }
    maxpc = 100;
// OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD
    for (sleep(1); does_file_exist(tempfile); sleep(1)) {
        pcno = grab_percentage_from_last_line_of_file(MONDO_LOGFILE);
        if (pcno < 0 || pcno > 100) {
            log_msg(5, "Weird pc#");
            continue;
        }
        percentage = pcno * 100 / maxpc;
        if (pcno <= 5 && last_pcno > 40) {
            close_evalcall_form();
            strcpy(title, "Verifying...");
            open_evalcall_form(title);
        }
        last_pcno = pcno;
        update_evalcall_form(percentage);
    }
// OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD OLD
    close_evalcall_form();
    if (pclose(pin)) {
        res++;
        log_OS_error("Unable to pclose");
    }
    unlink(tempfile);
    paranoid_free(command);
    paranoid_free(tempfile);
    paranoid_free(title);
    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;
    char *title;
    /*@ 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;

    malloc_string(title);
    malloc_string(command);
    strcpy(title, tt);
    sprintf(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");
    open_evalcall_form(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#");
            continue;
        }
        percentage = pcno * 100 / maxpc;
        if (pcno <= 5 && last_pcno >= 40) {
            close_evalcall_form();
            strcpy(title, "Verifying...");
            open_evalcall_form(title);
        }
        if (counter++ >= 5) {
            counter = 0;
            log_file_end_to_screen(MONDO_LOGFILE, "");
        }
        last_pcno = pcno;
        update_evalcall_form(percentage);
    }
    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);
    paranoid_free(command);
    paranoid_free(title);
    return (res);
}



#define PIH_LOG "/var/log/partimage-debug.log"


/**
 * Feed @p input_fifo through partimage (restore) to @p output_device.
 * @param input_fifo The partimage file to read.
 * @param output_device Where to put the output.
 * @return The return value of partimagehack (0 for success).
 * @bug Probably unnecessary, as the partimage is just a sparse file. We could use @c dd to restore it.
 */
int feed_outfrom_partimage(char *output_device, char *input_fifo)
{
// RESTORE
    char *tmp;
//  char *command;
    char *stuff;
    char *sz_call_to_partimage;
    pthread_t partimage_thread;
    int res;
    char *curr_fifo;
    char *prev_fifo;
    char *oldest_fifo;
    char *next_fifo;
    char *afternxt_fifo;
    int fifo_number = 0;
    char *tmpstub;
    FILE *fin;
    FILE *fout;

    malloc_string(curr_fifo);
    malloc_string(prev_fifo);
    malloc_string(next_fifo);
    malloc_string(afternxt_fifo);
    malloc_string(oldest_fifo);
    malloc_string(tmp);
    sz_call_to_partimage = malloc(1000);
    malloc_string(stuff);
    malloc_string(tmpstub);

    log_msg(1, "output_device=%s", output_device);
    log_msg(1, "input_fifo=%s", input_fifo);
/* I don't trust g_tmpfs_mountpt
  if (g_tmpfs_mountpt[0])
    {
      strcpy(tmpstub, g_tmpfs_mountpt);
    }
  else
    {
*/
    strcpy(tmpstub, "/tmp");
//    }
    log_msg(1, "tmpstub was %s", tmpstub);
    strcpy(stuff, tmpstub);
    sprintf(tmpstub, "%s/pih-fifo-%ld", stuff, (long int) random());
    log_msg(1, "tmpstub is now %s", tmpstub);
    unlink("/tmp/PARTIMAGEHACK-POSITION");
    unlink(PAUSE_PARTIMAGE_FNAME);
    paranoid_system("rm -f /tmp/*PARTIMAGE*");
    sprintf(curr_fifo, "%s.%03d", tmpstub, fifo_number);
    sprintf(next_fifo, "%s.%03d", tmpstub, fifo_number + 1);
    sprintf(afternxt_fifo, "%s.%03d", tmpstub, fifo_number + 2);
    mkfifo(PIH_LOG, S_IRWXU | S_IRWXG);
    mkfifo(curr_fifo, S_IRWXU | S_IRWXG);
    mkfifo(next_fifo, S_IRWXU | S_IRWXG);   // make sure _next_ fifo already exists before we call partimage
    mkfifo(afternxt_fifo, S_IRWXU | S_IRWXG);
    system("cat " PIH_LOG " > /dev/null &");
    log_msg(3, "curr_fifo   = %s", curr_fifo);
    log_msg(3, "next_fifo   = %s", next_fifo);
    if (!does_file_exist(input_fifo)) {
        fatal_error("input fifo does not exist");
    }
    if (!(fin = fopen(input_fifo, "r"))) {
        fatal_error("Unable to openin from input_fifo");
    }
    if (!find_home_of_exe("partimagehack")) {
        fatal_error("partimagehack not found");
    }
    sz_call_to_partimage[0] = 2;
    sz_call_to_partimage[1] = 0;
    sprintf(sz_call_to_partimage + 2,
            "partimagehack " PARTIMAGE_PARAMS
            " restore %s %s > /dev/null 2>> %s", output_device, curr_fifo,
            MONDO_LOGFILE);
    log_msg(1, "output_device = %s", output_device);
    log_msg(1, "curr_fifo = %s", curr_fifo);
    log_msg(1, "sz_call_to_partimage+2 = %s", sz_call_to_partimage + 2);
    res =
        pthread_create(&partimage_thread, NULL, call_partimage_in_bkgd,
                       (void *) sz_call_to_partimage);
    if (res) {
        fatal_error("Failed to create thread to call partimage");
    }
    log_msg(1, "Running fore/back at same time");
    log_msg(2, " Trying to openin %s", input_fifo);
    if (!does_file_exist(input_fifo)) {
        log_msg(2, "Warning - %s does not exist", input_fifo);
    }
    while (!does_file_exist("/tmp/PARTIMAGEHACK-POSITION")) {
        log_msg(6, "Waiting for partimagehack (restore) to start");
        sleep(1);
    }
    while (sz_call_to_partimage[0] > 0) {
        if (fread(tmp, 1, 128, fin) != 128) {
            fatal_error("Cannot read introductory block");
        }
        if (strstr(tmp, NEXT_SUBVOL_PLEASE)) {
            log_msg(2, "Great. Next subvol coming up.");
        } else if (strstr(tmp, NO_MORE_SUBVOLS)) {
            log_msg(2, "Great. That was the last subvol.");
            break;
        } else {
            log_msg(2, "WTF is this? '%s'", tmp);
            fatal_error("Unknown interim block");
        }
        if (feof(fin)) {
            log_msg(1, "Eof(fin) detected. Breaking.");
            break;
        }
        log_msg(3, "Processing subvol %d", fifo_number);
        log_msg(5, "fifo_number=%d", fifo_number);
        if (!(fout = fopen(curr_fifo, "w"))) {
            fatal_error("Cannot openout to curr_fifo");
        }
        log_msg(6, "Deleting %s", oldest_fifo);
        copy_from_src_to_dest(fout, fin, 'r');
        paranoid_fclose(fout);
        fifo_number++;
        unlink(oldest_fifo);    // just in case
        strcpy(oldest_fifo, prev_fifo);
        strcpy(prev_fifo, curr_fifo);
        strcpy(curr_fifo, next_fifo);
        strcpy(next_fifo, afternxt_fifo);
        sprintf(afternxt_fifo, "%s.%03d", tmpstub, fifo_number + 2);
        log_msg(6, "Creating %s", afternxt_fifo);
        mkfifo(afternxt_fifo, S_IRWXU | S_IRWXG);   // make sure _next_ fifo already exists before we access current fifo
        fflush(fin);
//      system("sync");
        usleep(1000L * 100L);
    }
    paranoid_fclose(fin);
    paranoid_system("sync");
    log_msg(1, "Partimagehack has finished. Great. Fin-closing.");
    log_msg(1, "Waiting for pthread_join");
    pthread_join(partimage_thread, NULL);
    res = sz_call_to_partimage[1];
    log_msg(1, "Yay. Partimagehack (restore) returned %d", res);
    unlink(prev_fifo);
    unlink(curr_fifo);
    unlink(next_fifo);
    unlink(afternxt_fifo);
    unlink(PIH_LOG);
    paranoid_free(tmp);
    paranoid_free(sz_call_to_partimage);
    paranoid_free(stuff);
    paranoid_free(prev_fifo);
    paranoid_free(curr_fifo);
    paranoid_free(next_fifo);
    paranoid_free(afternxt_fifo);
    paranoid_free(oldest_fifo);
    paranoid_free(tmpstub);
    return (res);
}