153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*-
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* Copyright 1997 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: file.c,v 1.2 1997/11/08 22:15:55 obrien Exp $
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include "fetch.h"
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static int file_retrieve(struct fetch_state *fs);
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static int file_close(struct fetch_state *fs);
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static int file_parse(struct fetch_state *fs, const char *uri);
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struct uri_scheme file_scheme =
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{ "file", file_parse, 0, 0, 0 };
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/*
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* Again, we slightly misinterpret the slash after the hostname as
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* being the start of the pathname rather than merely a separator.
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*/
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static int
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file_parse(struct fetch_state *fs, const char *uri)
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{
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const char *p;
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p = uri + 5; /* skip past `file:' */
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if (p[0] == '/' && p[1] == '/') {
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/* skip past `//localhost', if any */
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p += 2;
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while (*p && *p != '/')
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p++;
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}
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if (p[0] != '/') {
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warnx("`%s': expected absolute pathname in `file' URL", uri);
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return EX_USAGE;
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}
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fs->fs_proto = percent_decode(p);
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/* guaranteed to succeed because of above test */
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p = strrchr(fs->fs_proto, '/');
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if (fs->fs_outputfile == 0) /* only set if not overridden by user */
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fs->fs_outputfile = p + 1;
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fs->fs_retrieve = file_retrieve;
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fs->fs_close = file_close;
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return 0;
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}
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static int
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file_close(struct fetch_state *fs)
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{
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free(fs->fs_proto);
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fs->fs_proto = 0;
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fs->fs_outputfile = 0;
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fs->fs_status = "free";
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return 0;
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}
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static int
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file_retrieve(struct fetch_state *fs)
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{
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struct stat sb;
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/* XXX - this seems bogus to me! */
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if (access(fs->fs_outputfile, F_OK) == 0) {
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errno = EEXIST;
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warn("%s", fs->fs_outputfile);
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return EX_USAGE;
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}
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if (fs->fs_linkfile) {
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fs->fs_status = "checking path";
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if (stat(fs->fs_proto, &sb) == -1) {
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warn("non-unexistent");
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return EX_NOINPUT;
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}
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fs->fs_status = "symlink";
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if (symlink(fs->fs_proto, fs->fs_outputfile) == -1) {
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warn("symlink");
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return EX_OSERR;
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}
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fs->fs_status = "done";
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} else {
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pid_t pid;
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int status;
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fflush(stderr);
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pid = fork();
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if (pid < 0) {
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warn("fork");
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return EX_TEMPFAIL;
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} else if (pid == 0) {
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execl(PATH_CP, "cp", "-p", fs->fs_proto,
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fs->fs_outputfile, (char *)0);
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warn("execl: " PATH_CP);
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fflush(stderr);
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_exit(EX_OSERR);
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} else {
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fs->fs_status = "copying";
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if (waitpid(pid, &status, 0) < 0) {
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warn("waitpid(%ld)", (long)pid);
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return EX_OSERR;
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}
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if (WIFEXITED(status))
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return WEXITSTATUS(status);
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if (WIFSIGNALED(status))
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warn(PATH_CP " exited on signal: %s",
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sys_signame[WTERMSIG(status)]);
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return EX_OSERR;
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}
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}
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return 0;
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}
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