Add progress messages to zero command.

[libguestfs.git] / daemon / checksum.c

diff --git a/daemon/checksum.c b/daemon/checksum.c
index 13719fd..e12a8a8 100644 (file)
--- a/daemon/checksum.c
+++ b/daemon/checksum.c
@@ -22,39 +22,50 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
 
 #include "../src/guestfs_protocol.h"
 #include "daemon.h"
 #include "actions.h"
 
-static char *
-checksum (const char *csumtype, const char *path)
+static const char *
+program_of_csum (const char *csumtype)
 {
-  const char *program;
-  char *out, *err;
-  int r;
-  int len;
-
   if (STRCASEEQ (csumtype, "crc"))
-    program = "cksum";
+    return "cksum";
   else if (STRCASEEQ (csumtype, "md5"))
-    program = "md5sum";
+    return "md5sum";
   else if (STRCASEEQ (csumtype, "sha1"))
-    program = "sha1sum";
+    return "sha1sum";
   else if (STRCASEEQ (csumtype, "sha224"))
-    program = "sha224sum";
+    return "sha224sum";
   else if (STRCASEEQ (csumtype, "sha256"))
-    program = "sha256sum";
+    return "sha256sum";
   else if (STRCASEEQ (csumtype, "sha384"))
-    program = "sha384sum";
+    return "sha384sum";
   else if (STRCASEEQ (csumtype, "sha512"))
-    program = "sha512sum";
+    return "sha512sum";
   else {
     reply_with_error ("unknown checksum type, expecting crc|md5|sha1|sha224|sha256|sha384|sha512");
     return NULL;
   }
+}
+
+static char *
+checksum (const char *csumtype, int fd)
+{
+  const char *program;
+  char *out, *err;
+  int flags, r;
+  int len;
 
-  r = command (&out, &err, program, path, NULL);
+  program = program_of_csum (csumtype);
+  if (program == NULL)
+    return NULL;
+
+  flags = COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN | fd;
+  r = commandf (&out, &err, flags, program, NULL);
   if (r == -1) {
     reply_with_error ("%s: %s", program, err);
     free (out);
@@ -74,20 +85,113 @@ checksum (const char *csumtype, const char *path)
 char *
 do_checksum (const char *csumtype, const char *path)
 {
-  /* Make the path relative to /sysroot. */
-  char *buf = sysroot_path (path);
-  if (!buf) {
-    reply_with_perror ("malloc");
+  int fd;
+
+  CHROOT_IN;
+  fd = open (path, O_RDONLY);
+  CHROOT_OUT;
+
+  if (fd == -1) {
+    reply_with_perror ("%s", path);
     return NULL;
   }
 
-  char *r = checksum (csumtype, buf);
-  free (buf);
-  return r;
+  return checksum (csumtype, fd);
 }
 
 char *
 do_checksum_device (const char *csumtype, const char *device)
 {
-  return checksum (csumtype, device);
+  int fd;
+
+  fd = open (device, O_RDONLY);
+  if (fd == -1) {
+    reply_with_perror ("%s", device);
+    return NULL;
+  }
+
+  return checksum (csumtype, fd);
+}
+
+/* Has one FileOut parameter. */
+int
+do_checksums_out (const char *csumtype, const char *dir)
+{
+  struct stat statbuf;
+  int r;
+
+  const char *program = program_of_csum (csumtype);
+  if (program == NULL)
+    return -1;
+
+  char *sysrootdir = sysroot_path (dir);
+  if (!sysrootdir) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+
+  r = stat (sysrootdir, &statbuf);
+  if (r == -1) {
+    reply_with_perror ("%s", dir);
+    free (sysrootdir);
+    return -1;
+  }
+  if (!S_ISDIR (statbuf.st_mode)) {
+    reply_with_error ("%s: not a directory", dir);
+    free (sysrootdir);
+    return -1;
+  }
+
+  char *cmd;
+  if (asprintf_nowarn (&cmd, "cd %Q && find -type f -print0 | xargs -0 %s",
+                       sysrootdir, program) == -1) {
+    reply_with_perror ("asprintf");
+    free (sysrootdir);
+    return -1;
+  }
+  free (sysrootdir);
+
+  if (verbose)
+    fprintf (stderr, "%s\n", cmd);
+
+  FILE *fp = popen (cmd, "r");
+  if (fp == NULL) {
+    reply_with_perror ("%s", cmd);
+    free (cmd);
+    return -1;
+  }
+  free (cmd);
+
+  /* Now we must send the reply message, before the file contents.  After
+   * this there is no opportunity in the protocol to send any error
+   * message back.  Instead we can only cancel the transfer.
+   */
+  reply (NULL, NULL);
+
+  char str[GUESTFS_MAX_CHUNK_SIZE];
+
+  while ((r = fread (str, 1, GUESTFS_MAX_CHUNK_SIZE, fp)) > 0) {
+    if (send_file_write (str, r) < 0) {
+      pclose (fp);
+      return -1;
+    }
+  }
+
+  if (ferror (fp)) {
+    perror (dir);
+    send_file_end (1);                /* Cancel. */
+    pclose (fp);
+    return -1;
+  }
+
+  if (pclose (fp) != 0) {
+    perror (dir);
+    send_file_end (1);                /* Cancel. */
+    return -1;
+  }
+
+  if (send_file_end (0))        /* Normal end of file. */
+    return -1;
+
+  return 0;
 }