177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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* FreeBSD install - a package for the installation and maintainance
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* of non-core utilities.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Jordan K. Hubbard
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* 18 July 1993
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*
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* Routines for managing the "play pen".
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "lib.h"
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#include <err.h>
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#include <libgen.h>
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#include <sys/signal.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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/* For keeping track of where we are */
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static char PenLocation[FILENAME_MAX];
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static char Previous[FILENAME_MAX];
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char *
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where_playpen(void)
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{
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return PenLocation;
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}
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/* Find a good place to play. */
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static char *
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find_play_pen(char *pen, off_t sz)
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{
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char *cp;
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struct stat sb;
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if (pen[0] && isdir(dirname(pen)) == TRUE && (min_free(dirname(pen)) >= sz))
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return pen;
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else if ((cp = getenv("PKG_TMPDIR")) != NULL && stat(cp, &sb) != FAIL && (min_free(cp) >= sz))
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sprintf(pen, "%s/instmp.XXXXXX", cp);
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else if ((cp = getenv("TMPDIR")) != NULL && stat(cp, &sb) != FAIL && (min_free(cp) >= sz))
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sprintf(pen, "%s/instmp.XXXXXX", cp);
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else if (stat("/var/tmp", &sb) != FAIL && min_free("/var/tmp") >= sz)
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strcpy(pen, "/var/tmp/instmp.XXXXXX");
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else if (stat("/tmp", &sb) != FAIL && min_free("/tmp") >= sz)
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strcpy(pen, "/tmp/instmp.XXXXXX");
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else if ((stat("/usr/tmp", &sb) == SUCCESS || mkdir("/usr/tmp", 01777) == SUCCESS) && min_free("/usr/tmp") >= sz)
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strcpy(pen, "/usr/tmp/instmp.XXXXXX");
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else {
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cleanup(0);
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errx(2,
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"%s: can't find enough temporary space to extract the files, please set your\n"
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"PKG_TMPDIR environment variable to a location with at least %ld bytes\n"
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"free", __func__, (long)sz);
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return NULL;
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}
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return pen;
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}
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#define MAX_STACK 20
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static char *pstack[MAX_STACK];
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static int pdepth = -1;
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static void
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pushPen(const char *pen)
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{
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if (++pdepth == MAX_STACK)
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errx(2, "%s: stack overflow.\n", __func__);
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pstack[pdepth] = strdup(pen);
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}
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static void
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popPen(char *pen)
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{
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if (pdepth == -1) {
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pen[0] = '\0';
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return;
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}
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strcpy(pen, pstack[pdepth]);
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free(pstack[pdepth--]);
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}
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/*
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* Make a temporary directory to play in and chdir() to it, returning
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* pathname of previous working directory.
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*/
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char *
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make_playpen(char *pen, off_t sz)
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{
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if (!find_play_pen(pen, sz))
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return NULL;
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if (!mkdtemp(pen)) {
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cleanup(0);
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errx(2, "%s: can't mktemp '%s'", __func__, pen);
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}
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if (chmod(pen, 0700) == FAIL) {
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cleanup(0);
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errx(2, "%s: can't mkdir '%s'", __func__, pen);
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}
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if (Verbose) {
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if (sz)
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fprintf(stderr, "Requested space: %d bytes, free space: %qd bytes in %s\n", (int)sz, (long long)min_free(pen), pen);
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}
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if (min_free(pen) < sz) {
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rmdir(pen);
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cleanup(0);
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errx(2, "%s: not enough free space to create '%s'.\n"
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"Please set your PKG_TMPDIR environment variable to a location\n"
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"with more space and\ntry the command again", __func__, pen);
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}
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if (!getcwd(Previous, FILENAME_MAX)) {
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upchuck("getcwd");
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return NULL;
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}
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if (chdir(pen) == FAIL) {
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cleanup(0);
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errx(2, "%s: can't chdir to '%s'", __func__, pen);
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}
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if (PenLocation[0])
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pushPen(PenLocation);
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strcpy(PenLocation, pen);
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return Previous;
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}
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/* Convenience routine for getting out of playpen */
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void
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leave_playpen()
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{
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void (*oldsig)(int);
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/* Don't interrupt while we're cleaning up */
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oldsig = signal(SIGINT, SIG_IGN);
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if (Previous[0]) {
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if (chdir(Previous) == FAIL) {
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cleanup(0);
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errx(2, "%s: can't chdir back to '%s'", __func__, Previous);
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}
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Previous[0] = '\0';
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}
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if (PenLocation[0]) {
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if (PenLocation[0] == '/' && vsystem("rm -rf %s", PenLocation))
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warnx("couldn't remove temporary dir '%s'", PenLocation);
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popPen(PenLocation);
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}
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signal(SIGINT, oldsig);
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}
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off_t
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min_free(const char *tmpdir)
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{
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struct statfs buf;
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if (statfs(tmpdir, &buf) != 0) {
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warn("statfs");
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return -1;
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}
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return (off_t)buf.f_bavail * (off_t)buf.f_bsize;
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}
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