mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-21 22:53:37 +00:00
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.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 <unistd.h>
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#include <fcntl.h>
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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static char **
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headtail (const char *prog, const char *flag, const char *n, const char *path)
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{
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CLEANUP_FREE char *out = NULL, *err = NULL;
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int fd, flags, r;
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char **lines;
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CHROOT_IN;
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fd = open (path, O_RDONLY|O_CLOEXEC);
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CHROOT_OUT;
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if (fd == -1) {
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reply_with_perror ("%s", path);
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return NULL;
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}
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flags = COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN | fd;
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r = commandf (&out, &err, flags, prog, flag, n, NULL);
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if (r == -1) {
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reply_with_error ("%s %s %s: %s", prog, flag, n, err);
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return NULL;
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}
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#if 0
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/* Split it at the first whitespace. */
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len = strcspn (out, " \t\n");
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out[len] = '\0';
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#endif
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lines = split_lines (out);
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if (lines == NULL) return NULL;
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return lines;
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}
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char **
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do_head (const char *path)
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{
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return headtail ("head", "-n", "10", path);
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}
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char **
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do_tail (const char *path)
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{
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return headtail ("tail", "-n", "10", path);
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}
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char **
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do_head_n (int n, const char *path)
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{
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char nbuf[16];
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snprintf (nbuf, sizeof nbuf, "%d", n);
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return headtail ("head", "-n", nbuf, path);
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}
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char **
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do_tail_n (int n, const char *path)
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{
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char nbuf[16];
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if (n >= 0)
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snprintf (nbuf, sizeof nbuf, "%d", n);
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else
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snprintf (nbuf, sizeof nbuf, "+%d", -n);
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return headtail ("tail", "-n", nbuf, path);
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}
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