1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "../src/guestfs_protocol.h"
31 headtail (const char *prog, const char *flag, const char *n, const char *path)
38 /* Make the path relative to /sysroot. */
39 buf = sysroot_path (path);
41 reply_with_perror ("malloc");
45 r = command (&out, &err, prog, flag, n, buf, NULL);
48 reply_with_error ("%s %s %s: %s", prog, flag, n, err);
57 /* Split it at the first whitespace. */
58 len = strcspn (out, " \t\n");
62 lines = split_lines (out);
64 if (lines == NULL) return NULL;
70 do_head (const char *path)
72 return headtail ("head", "-n", "10", path);
76 do_tail (const char *path)
78 return headtail ("tail", "-n", "10", path);
82 do_head_n (int n, const char *path)
86 snprintf (nbuf, sizeof nbuf, "%d", n);
88 return headtail ("head", "-n", nbuf, path);
92 do_tail_n (int n, const char *path)
97 snprintf (nbuf, sizeof nbuf, "%d", n);
99 snprintf (nbuf, sizeof nbuf, "+%d", -n);
101 return headtail ("tail", "-n", nbuf, path);