From: Richard W.M. Jones Date: Fri, 18 Mar 2011 17:17:30 +0000 (+0000) Subject: proto: Fix FileIn ops that abort during the chunk upload stage. X-Git-Tag: 1.9.12~2 X-Git-Url: http://git.annexia.org/?a=commitdiff_plain;h=33b638109ed66ea360b53b80b1f407b3a5f5ec39;p=libguestfs.git proto: Fix FileIn ops that abort during the chunk upload stage. As a previous, incorrect attempt to fix RHBZ#576879 we tried to prevent the daemon from sending an error reply if the daemon had cancelled the transfer. This is wrong: the daemon should send an error reply in these cases. A simple test case is this: guestfish -N fs -m /dev/sda1 upload big-file / (This fails because the target "/" is a directory, not a file.) Prior to this commit, libguestfs would hang instead of printing an error. With this commit, libguestfs prints an error. What is happening is: (1) Library is uploading a file (2) In the middle of the long upload, daemon detects an error. Daemon cancels. (3) Library detects cancel, sends cancel chunk, then waits for the error reply from the daemon. (4) Daemon is supposed to send an error reply message. Because step (4) wasn't happening, uploads that failed like this would hang in the library (waiting for the error message, while the daemon was waiting for the next request). This also adds a regression test. This temporarily breaks the "both ends cancel" case (RHBZ#576879c5). Therefore the test for that is disabled, and this is fixed in the next patch in the series. This partially reverts commit dc706a639eec16084c0618baf7bfde00c6565f63. --- diff --git a/daemon/command.c b/daemon/command.c index 8ad5db5..5a194a4 100644 --- a/daemon/command.c +++ b/daemon/command.c @@ -36,7 +36,7 @@ do_command (char *const *argv) int dev_ok, dev_pts_ok, proc_ok, selinux_ok, sys_ok; /* We need a root filesystem mounted to do this. */ - NEED_ROOT (0, return NULL); + NEED_ROOT (, return NULL); /* Conveniently, argv is already a NULL-terminated argv-style array * of parameters, so we can pass it straight in to our internal diff --git a/daemon/daemon.h b/daemon/daemon.h index 4a686c0..79f41ae 100644 --- a/daemon/daemon.h +++ b/daemon/daemon.h @@ -152,10 +152,6 @@ extern int receive_file (receive_cb cb, void *opaque); /* daemon functions that receive files (FileIn) can call this * to cancel incoming transfers (eg. if there is a local error). - * - * If and only if this function does NOT return -2, they MUST then - * call reply_with_* - * (see https://bugzilla.redhat.com/show_bug.cgi?id=576879#c5). */ extern int cancel_receive (void); @@ -181,8 +177,8 @@ extern void notify_progress (uint64_t position, uint64_t total); #define NEED_ROOT(cancel_stmt,fail_stmt) \ do { \ if (!is_root_mounted ()) { \ - if ((cancel_stmt) != -2) \ - reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \ + cancel_stmt; \ + reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \ fail_stmt; \ } \ } \ @@ -194,8 +190,8 @@ extern void notify_progress (uint64_t position, uint64_t total); #define ABS_PATH(path,cancel_stmt,fail_stmt) \ do { \ if ((path)[0] != '/') { \ - if ((cancel_stmt) != -2) \ - reply_with_error ("%s: path must start with a / character", __func__); \ + cancel_stmt; \ + reply_with_error ("%s: path must start with a / character", __func__); \ fail_stmt; \ } \ } while (0) @@ -210,18 +206,17 @@ extern void notify_progress (uint64_t position, uint64_t total); #define RESOLVE_DEVICE(path,cancel_stmt,fail_stmt) \ do { \ if (STRNEQLEN ((path), "/dev/", 5)) { \ - if ((cancel_stmt) != -2) \ - reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \ + cancel_stmt; \ + reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \ fail_stmt; \ } \ if (is_root_device (path)) \ reply_with_error ("%s: %s: device not found", __func__, path); \ if (device_name_translation ((path)) == -1) { \ int err = errno; \ - int r = cancel_stmt; \ + cancel_stmt; \ errno = err; \ - if (r != -2) \ - reply_with_perror ("%s: %s", __func__, path); \ + reply_with_perror ("%s: %s", __func__, path); \ fail_stmt; \ } \ } while (0) diff --git a/daemon/df.c b/daemon/df.c index a1ec706..7127c00 100644 --- a/daemon/df.c +++ b/daemon/df.c @@ -33,7 +33,7 @@ do_df (void) int r; char *out, *err; - NEED_ROOT (0, return NULL); + NEED_ROOT (, return NULL); r = command (&out, &err, "df", NULL); if (r == -1) { @@ -54,7 +54,7 @@ do_df_h (void) int r; char *out, *err; - NEED_ROOT (0, return NULL); + NEED_ROOT (, return NULL); r = command (&out, &err, "df", "-h", NULL); if (r == -1) { diff --git a/daemon/inotify.c b/daemon/inotify.c index 807fb2f..8e8b690 100644 --- a/daemon/inotify.c +++ b/daemon/inotify.c @@ -70,7 +70,7 @@ do_inotify_init (int max_events) #ifdef HAVE_SYS_INOTIFY_H FILE *fp; - NEED_ROOT (0, return -1); + NEED_ROOT (, return -1); if (max_events < 0) { reply_with_error ("max_events < 0"); diff --git a/daemon/mount.c b/daemon/mount.c index 0c990c3..a915b44 100644 --- a/daemon/mount.c +++ b/daemon/mount.c @@ -83,7 +83,7 @@ do_mount_vfs (const char *options, const char *vfstype, char *error; struct stat statbuf; - ABS_PATH (mountpoint, 0, return -1); + ABS_PATH (mountpoint, , return -1); mp = sysroot_path (mountpoint); if (!mp) { @@ -158,7 +158,7 @@ do_umount (const char *pathordevice) } if (is_dev) - RESOLVE_DEVICE (buf, 0, { free (buf); return -1; }); + RESOLVE_DEVICE (buf, , { free (buf); return -1; }); r = command (NULL, &err, "umount", buf, NULL); free (buf); @@ -409,7 +409,7 @@ do_mkmountpoint (const char *path) int r; /* NEED_ROOT (return -1); - we don't want this test for this call. */ - ABS_PATH (path, 0, return -1); + ABS_PATH (path, , return -1); CHROOT_IN; r = mkdir (path, 0777); @@ -429,7 +429,7 @@ do_rmmountpoint (const char *path) int r; /* NEED_ROOT (return -1); - we don't want this test for this call. */ - ABS_PATH (path, 0, return -1); + ABS_PATH (path, , return -1); CHROOT_IN; r = rmdir (path); diff --git a/daemon/tar.c b/daemon/tar.c index 2ddde88..3c756af 100644 --- a/daemon/tar.c +++ b/daemon/tar.c @@ -85,7 +85,7 @@ do_tXz_in (const char *dir, const char *filter) err = errno; r = cancel_receive (); errno = err; - if (r != -2) reply_with_perror ("asprintf"); + reply_with_perror ("asprintf"); return -1; } @@ -97,7 +97,7 @@ do_tXz_in (const char *dir, const char *filter) err = errno; r = cancel_receive (); errno = err; - if (r != -2) reply_with_perror ("%s", cmd); + reply_with_perror ("%s", cmd); free (cmd); return -1; } @@ -110,11 +110,10 @@ do_tXz_in (const char *dir, const char *filter) r = receive_file (write_cb, &fd); if (r == -1) { /* write error */ - if (cancel_receive () != -2) { - char *errstr = read_error_file (); - reply_with_error ("write error on directory: %s: %s", dir, errstr); - free (errstr); - } + cancel_receive (); + char *errstr = read_error_file (); + reply_with_error ("write error on directory: %s: %s", dir, errstr); + free (errstr); pclose (fp); return -1; } @@ -127,12 +126,10 @@ do_tXz_in (const char *dir, const char *filter) if (pclose (fp) != 0) { if (r == -1) /* if r == 0, file transfer ended already */ r = cancel_receive (); - if (r != -2) { - char *errstr = read_error_file (); - reply_with_error ("tar subcommand failed on directory: %s: %s", - dir, errstr); - free (errstr); - } + char *errstr = read_error_file (); + reply_with_error ("tar subcommand failed on directory: %s: %s", + dir, errstr); + free (errstr); return -1; } diff --git a/daemon/upload.c b/daemon/upload.c index e28bf96..f8d312f 100644 --- a/daemon/upload.c +++ b/daemon/upload.c @@ -70,7 +70,7 @@ upload (const char *filename, int flags, int64_t offset) err = errno; r = cancel_receive (); errno = err; - if (r != -2) reply_with_perror ("%s", filename); + reply_with_perror ("%s", filename); return -1; } @@ -79,7 +79,7 @@ upload (const char *filename, int flags, int64_t offset) err = errno; r = cancel_receive (); errno = err; - if (r != -2) reply_with_perror ("lseek: %s", filename); + reply_with_perror ("lseek: %s", filename); return -1; } } @@ -89,7 +89,7 @@ upload (const char *filename, int flags, int64_t offset) err = errno; r = cancel_receive (); errno = err; - if (r != -2) reply_with_error ("write error: %s", filename); + reply_with_error ("write error: %s", filename); close (data.fd); return -1; } @@ -104,8 +104,7 @@ upload (const char *filename, int flags, int64_t offset) if (r == -1) /* if r == 0, file transfer ended already */ r = cancel_receive (); errno = err; - if (r != -2) - reply_with_perror ("close: %s", filename); + reply_with_perror ("close: %s", filename); return -1; } diff --git a/generator/generator_daemon.ml b/generator/generator_daemon.ml index 21a5888..8c3a548 100644 --- a/generator/generator_daemon.ml +++ b/generator/generator_daemon.ml @@ -165,15 +165,15 @@ and generate_daemon_actions () = | Pathname n -> pr_args n; pr " ABS_PATH (%s, %s, goto done);\n" - n (if is_filein then "cancel_receive ()" else "0"); + n (if is_filein then "cancel_receive ()" else ""); | Device n -> pr_args n; pr " RESOLVE_DEVICE (%s, %s, goto done);\n" - n (if is_filein then "cancel_receive ()" else "0"); + n (if is_filein then "cancel_receive ()" else ""); | Dev_or_Path n -> pr_args n; pr " REQUIRE_ROOT_OR_RESOLVE_DEVICE (%s, %s, goto done);\n" - n (if is_filein then "cancel_receive ()" else "0"); + n (if is_filein then "cancel_receive ()" else ""); | String n | Key n -> pr_args n | OptString n -> pr " %s = args.%s ? *args.%s : NULL;\n" n n n | StringList n -> @@ -187,7 +187,7 @@ and generate_daemon_actions () = pr " size_t i;\n"; pr " for (i = 0; %s[i] != NULL; ++i)\n" n; pr " RESOLVE_DEVICE (%s[i], %s, goto done);\n" n - (if is_filein then "cancel_receive ()" else "0"); + (if is_filein then "cancel_receive ()" else ""); pr " }\n"; | Bool n -> pr " %s = args.%s;\n" n n | Int n -> pr " %s = args.%s;\n" n n @@ -206,7 +206,7 @@ and generate_daemon_actions () = (* Emit NEED_ROOT just once, even when there are two or more Pathname args *) pr " NEED_ROOT (%s, goto done);\n" - (if is_filein then "cancel_receive ()" else "0"); + (if is_filein then "cancel_receive ()" else ""); ); (* Don't want to call the impl with any FileIn or FileOut diff --git a/regressions/Makefile.am b/regressions/Makefile.am index a64d272..6527e06 100644 --- a/regressions/Makefile.am +++ b/regressions/Makefile.am @@ -29,8 +29,7 @@ TESTS = \ rhbz503169c10.sh \ rhbz503169c13.sh \ rhbz557655.sh \ - rhbz576879c0.sh \ - rhbz576879c5.sh \ + rhbz576879.sh \ rhbz578407.sh \ rhbz580246.sh \ test-add-domain.sh \ @@ -53,12 +52,14 @@ TESTS = \ test-read_file.sh \ test-remote.sh \ test-reopen.sh \ - test-stringlist.sh + test-stringlist.sh \ + test-upload-to-dir.sh SKIPPED_TESTS = \ test-bootbootboot.sh FAILING_TESTS = \ + test-both-ends-cancel.sh \ test-qemudie-launchfail.sh random_val := $(shell awk 'BEGIN{srand(); print 1+int(255*rand())}' < /dev/null) diff --git a/regressions/rhbz576879c0.sh b/regressions/rhbz576879.sh similarity index 94% rename from regressions/rhbz576879c0.sh rename to regressions/rhbz576879.sh index f060496..d3db55b 100755 --- a/regressions/rhbz576879c0.sh +++ b/regressions/rhbz576879.sh @@ -25,7 +25,7 @@ set -e rm -f test1.img ../fish/guestfish -N disk <test.out +then + echo "$0: expecting guestfish to return an error" + exit 1 +fi + +if ! grep -q "upload: /: Is a directory" test.out; then + echo "$0: unexpected error message from guestfish" + cat test.out + exit 1 +fi + +rm -f test1.img test.out