Implement '*grep*' family of commands.

.gitignore

@@ -84,6 +84,7 @@ images/initrd
 images/initrd-x86_64.img
 images/initrd-x86_64.img.gz
 images/test.sqsh
+images/test-grep.txt.gz
 initramfs
 initramfs.timestamp
 inspector/virt-inspector.1

TODO

@@ -144,7 +144,6 @@ Ideas for extra commands
 
   General glibc / core programs:
     chgrp
-    grep (do it locally using pipe?)
     dd (?)
     ln / ln -s
     readlink

daemon/Makefile.am

@@ -39,6 +39,7 @@ guestfsd_SOURCES = \
 	find.c \
 	fsck.c \
 	glob.c \
+	grep.c \
 	grub.c \
 	guestfsd.c \
 	headtail.c \

daemon/grep.c

@@ -0,0 +1,140 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+static char **
+grep (const char *prog, const char *flag, char *regex, char *path)
+{
+  char *buf;
+  char *out, *err;
+  int r;
+  char **lines;
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  /* Make the path relative to /sysroot. */
+  buf = sysroot_path (path);
+  if (!buf) {
+    reply_with_perror ("malloc");
+    return NULL;
+  }
+
+  /* Note that grep returns an error if no match.  We want to
+   * suppress this error and return an empty list.
+   */
+  r = commandr (&out, &err, prog, flag, regex, buf, NULL);
+  free (buf);
+  if (r == -1 || r > 1) {
+    reply_with_error ("%s %s %s: %s", prog, flag, regex, err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  lines = split_lines (out);
+  free (out);
+  if (lines == NULL) return NULL;
+
+  return lines;
+}
+
+char **
+do_grep (char *regex, char *path)
+{
+  /* The "--" is not really needed, but it helps when we don't need a flag. */
+  return grep ("grep", "--", regex, path);
+}
+
+char **
+do_egrep (char *regex, char *path)
+{
+  return grep ("egrep", "--", regex, path);
+}
+
+char **
+do_fgrep (char *regex, char *path)
+{
+  return grep ("fgrep", "--", regex, path);
+}
+
+char **
+do_grepi (char *regex, char *path)
+{
+  return grep ("grep", "-i", regex, path);
+}
+
+char **
+do_egrepi (char *regex, char *path)
+{
+  return grep ("egrep", "-i", regex, path);
+}
+
+char **
+do_fgrepi (char *regex, char *path)
+{
+  return grep ("fgrep", "-i", regex, path);
+}
+
+char **
+do_zgrep (char *regex, char *path)
+{
+  return grep ("zgrep", "--", regex, path);
+}
+
+char **
+do_zegrep (char *regex, char *path)
+{
+  return grep ("zegrep", "--", regex, path);
+}
+
+char **
+do_zfgrep (char *regex, char *path)
+{
+  return grep ("zfgrep", "--", regex, path);
+}
+
+char **
+do_zgrepi (char *regex, char *path)
+{
+  return grep ("zgrep", "-i", regex, path);
+}
+
+char **
+do_zegrepi (char *regex, char *path)
+{
+  return grep ("zegrep", "-i", regex, path);
+}
+
+char **
+do_zfgrepi (char *regex, char *path)
+{
+  return grep ("zfgrep", "-i", regex, path);
+}

images/Makefile.am

@@ -32,8 +32,8 @@ EXTRA_DIST = \
 	lib-sparc.so \
 	lib-win32.dll \
 	lib-win64.dll \
-	lib-x86_64.so
-
+	lib-x86_64.so \
+	test-grep.txt
 
 noinst_DATA = test.sqsh
 
@@ -58,7 +58,8 @@ squash_files_src = \
 	$(srcdir)/lib-sparc.so \
 	$(srcdir)/lib-win32.dll \
 	$(srcdir)/lib-win64.dll \
-	$(srcdir)/lib-x86_64.so
+	$(srcdir)/lib-x86_64.so \
+	$(srcdir)/test-grep.txt
 
 squash_files_build = \
 	$(builddir)/100kallzeroes \
@@ -68,7 +69,8 @@ squash_files_build = \
 	$(builddir)/10klines \
 	$(builddir)/initrd \
 	$(builddir)/initrd-x86_64.img \
-	$(builddir)/initrd-x86_64.img.gz
+	$(builddir)/initrd-x86_64.img.gz \
+	$(builddir)/test-grep.txt.gz
 
 squash_files = $(squash_files_src) $(squash_files_build)
 
@@ -124,3 +126,8 @@ $(builddir)/initrd-x86_64.img.gz: initrd-x86_64.img
 	rm -f $@ $@-t
 	gzip --best -c $< > $@-t
 	mv $@-t $@
+
+$(builddir)/test-grep.txt.gz: test-grep.txt
+	rm -f $@ $@-t
+	gzip --best -c $< > $@-t
+	mv $@-t $@

images/test-grep.txt

@@ -0,0 +1,7 @@
+abc
+def
+ghi
+ghi
+
+abc123
+ABC

po/POTFILES.in

@@ -17,6 +17,7 @@ daemon/file.c
 daemon/find.c
 daemon/fsck.c
 daemon/glob.c
+daemon/grep.c
 daemon/grub.c
 daemon/guestfsd.c
 daemon/headtail.c

src/MAX_PROC_NR

@@ -1 +1 @@
-150
+162

src/generator.ml

@@ -3046,6 +3046,104 @@ handle files that contain embedded ASCII NUL characters.
 However unlike C<guestfs_download>, this function is limited
 in the total size of file that can be handled.");
 
+  ("grep", (RStringList "lines", [String "regex"; String "path"]), 151, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["grep"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"]);
+    InitSquashFS, Always, TestOutputList (
+      [["grep"; "nomatch"; "/test-grep.txt"]], [])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<grep> program and returns the
+matching lines.");
+
+  ("egrep", (RStringList "lines", [String "regex"; String "path"]), 152, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["egrep"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<egrep> program and returns the
+matching lines.");
+
+  ("fgrep", (RStringList "lines", [String "pattern"; String "path"]), 153, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["fgrep"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<fgrep> program and returns the
+matching lines.");
+
+  ("grepi", (RStringList "lines", [String "regex"; String "path"]), 154, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["grepi"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<grep -i> program and returns the
+matching lines.");
+
+  ("egrepi", (RStringList "lines", [String "regex"; String "path"]), 155, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["egrepi"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<egrep -i> program and returns the
+matching lines.");
+
+  ("fgrepi", (RStringList "lines", [String "pattern"; String "path"]), 156, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["fgrepi"; "abc"; "/test-grep.txt"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<fgrep -i> program and returns the
+matching lines.");
+
+  ("zgrep", (RStringList "lines", [String "regex"; String "path"]), 157, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zgrep"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zgrep> program and returns the
+matching lines.");
+
+  ("zegrep", (RStringList "lines", [String "regex"; String "path"]), 158, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zegrep"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zegrep> program and returns the
+matching lines.");
+
+  ("zfgrep", (RStringList "lines", [String "pattern"; String "path"]), 159, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zfgrep"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zfgrep> program and returns the
+matching lines.");
+
+  ("zgrepi", (RStringList "lines", [String "regex"; String "path"]), 160, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zgrepi"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zgrep -i> program and returns the
+matching lines.");
+
+  ("zegrepi", (RStringList "lines", [String "regex"; String "path"]), 161, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zegrepi"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zegrep -i> program and returns the
+matching lines.");
+
+  ("zfgrepi", (RStringList "lines", [String "pattern"; String "path"]), 162, [ProtocolLimitWarning],
+   [InitSquashFS, Always, TestOutputList (
+      [["zfgrepi"; "abc"; "/test-grep.txt.gz"]], ["abc"; "abc123"; "ABC"])],
+   "return lines matching a pattern",
+   "\
+This calls the external C<zfgrep -i> program and returns the
+matching lines.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions