[Xen-devel] [RFC PATCH 4/5] tools: add xenfs tool

[Juergen Gross <jgross@xxxxxxxx>]

Add the xenfs tool for accessing the hypervisor filesystem.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 tools/misc/Makefile |   6 ++++
 tools/misc/xenfs.c  | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 tools/misc/xenfs.c

diff --git a/tools/misc/Makefile b/tools/misc/Makefile
index 63947bfadc..9f3abd5bcf 100644
--- a/tools/misc/Makefile
+++ b/tools/misc/Makefile
@@ -24,6 +24,7 @@ INSTALL_SBIN-$(CONFIG_X86)     += xen-lowmemd
 INSTALL_SBIN-$(CONFIG_X86)     += xen-mfndump
 INSTALL_SBIN-$(CONFIG_X86)     += xen-ucode
 INSTALL_SBIN                   += xencov
+INSTALL_SBIN                   += xenfs
 INSTALL_SBIN                   += xenlockprof
 INSTALL_SBIN                   += xenperf
 INSTALL_SBIN                   += xenpm
@@ -86,6 +87,9 @@ xenperf: xenperf.o
 xenpm: xenpm.o
        $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
 
+xenfs: xenfs.o
+       $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenfs) $(APPEND_LDFLAGS)
+
 xenlockprof: xenlockprof.o
        $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
 
@@ -94,6 +98,8 @@ xen-hptool.o: CFLAGS += -I$(XEN_ROOT)/tools/libxc 
$(CFLAGS_libxencall)
 xen-hptool: xen-hptool.o
        $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenevtchn) $(LDLIBS_libxenctrl) 
$(LDLIBS_libxenguest) $(LDLIBS_libxenstore) $(APPEND_LDFLAGS)
 
+xenfs.o: CFLAGS += $(CFLAGS_libxenfs)
+
 # xen-mfndump incorrectly uses libxc internals
 xen-mfndump.o: CFLAGS += -I$(XEN_ROOT)/tools/libxc $(CFLAGS_libxencall)
 xen-mfndump: xen-mfndump.o
diff --git a/tools/misc/xenfs.c b/tools/misc/xenfs.c
new file mode 100644
index 0000000000..ecaa4ccb0a
--- /dev/null
+++ b/tools/misc/xenfs.c
@@ -0,0 +1,102 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xenfs.h>
+
+static struct xenfs_handle *hdl;
+
+static int xenfs_cat(char *path)
+{
+    int ret = 0;
+    char *result;
+
+    result = xenfs_read(hdl, path);
+    if (!result) {
+        perror("could not read");
+        ret = 3;
+    } else {
+        printf("%s\n", result);
+        free(result);
+    }
+    return ret;
+}
+
+static int xenfs_ls(char *path)
+{
+    struct xenfs_dirent *ent;
+    unsigned int n, i;
+    int ret = 0;
+
+    ent = xenfs_readdir(hdl, path, &n);
+    if (!ent) {
+        perror("could not read dir");
+        ret = 3;
+    } else {
+        for (i = 0; i < n; i++)
+            printf("%c %s\n", ent[i].is_dir ? 'd' : '-', ent[i].name);
+
+        free(ent);
+    }
+    return ret;
+}
+
+static int xenfs_tree_sub(char *path, unsigned int depth)
+{
+    struct xenfs_dirent *ent;
+    unsigned int n, i;
+    int ret = 0;
+    char *p;
+
+    ent = xenfs_readdir(hdl, path, &n);
+    if (!ent)
+        return 1;
+
+    for (i = 0; i < n; i++) {
+        printf("%*s%s%s\n", depth * 2, "", ent[i].name,
+               ent[i].is_dir ? "/" : "");
+        if (ent[i].is_dir) {
+            asprintf(&p, "%s%s%s", path, (depth == 1) ? "" : "/", ent[i].name);
+            if (xenfs_tree_sub(p, depth + 1))
+                ret = 1;
+        }
+    }
+
+    free(ent);
+
+    return ret;
+}
+
+static int xenfs_tree(void)
+{
+    printf("/\n");
+
+    return xenfs_tree_sub("/", 1);
+}
+
+int main(int argc, char *argv[])
+{
+    int ret;
+
+    hdl = xenfs_open(NULL, 0);
+
+    if (!hdl) {
+        fprintf(stderr, "Could not open libxenfs\n");
+        ret = 2;
+    } else if (argc == 3 && !strcmp(argv[1], "--cat"))
+        ret = xenfs_cat(argv[2]);
+    else if (argc == 3 && !strcmp(argv[1], "--ls"))
+        ret = xenfs_ls(argv[2]);
+    else if (argc == 2 && !strcmp(argv[1], "--tree"))
+        ret = xenfs_tree();
+    else {
+        fprintf(stderr, "usage: xenfs --ls <path>\n");
+        fprintf(stderr, "       xenfs --cat <path>\n");
+        fprintf(stderr, "       xenfs --tree\n");
+        ret = 1;
+    }
+
+    xenfs_close(hdl);
+
+    return ret;
+}
-- 
2.16.4


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