diff --git a/commands.c b/commands.c
new file mode 100644
index 0000000..23ad91c
--- /dev/null
+++ b/commands.c
@@ -0,0 +1,1148 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef NDEBUG
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <unistd.h>
+
+#include "amend/commands.h"
+#include "commands.h"
+#include "common.h"
+#include "cutils/misc.h"
+#include "cutils/properties.h"
+#include "firmware.h"
+#include "minzip/DirUtil.h"
+#include "minzip/Zip.h"
+#include "roots.h"
+
+static int gDidShowProgress = 0;
+
+#define UNUSED(p)   ((void)(p))
+
+#define CHECK_BOOL() \
+    do { \
+        assert(argv == NULL); \
+        if (argv != NULL) return -1; \
+        assert(argc == true || argc == false); \
+        if (argc != true && argc != false) return -1; \
+    } while (false)
+
+#define CHECK_WORDS() \
+    do { \
+        assert(argc >= 0); \
+        if (argc < 0) return -1; \
+        assert(argc == 0 || argv != NULL); \
+        if (argc != 0 && argv == NULL) return -1; \
+        if (permissions != NULL) { \
+            int CW_I_; \
+            for (CW_I_ = 0; CW_I_ < argc; CW_I_++) { \
+                assert(argv[CW_I_] != NULL); \
+                if (argv[CW_I_] == NULL) return -1; \
+            } \
+        } \
+    } while (false)
+
+#define CHECK_FN() \
+    do { \
+        CHECK_WORDS(); \
+        if (permissions != NULL) { \
+            assert(result == NULL); \
+            if (result != NULL) return -1; \
+        } else { \
+            assert(result != NULL); \
+            if (result == NULL) return -1; \
+        } \
+    } while (false)
+
+#define NO_PERMS(perms) \
+    do { \
+        PermissionRequestList *NP_PRL_ = (perms); \
+        if (NP_PRL_ != NULL) { \
+            int NP_RET_ = addPermissionRequestToList(NP_PRL_, \
+                    "", false, PERM_NONE); \
+            if (NP_RET_ < 0) { \
+                /* Returns from the calling function. \
+                 */ \
+                return NP_RET_; \
+            } \
+        } \
+    } while (false)
+
+/*
+ * Command definitions
+ */
+
+/* assert <boolexpr>
+ */
+static int
+cmd_assert(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_BOOL();
+    NO_PERMS(permissions);
+
+    /* If our argument is false, return non-zero (failure)
+     * If our argument is true, return zero (success)
+     */
+    if (argc) {
+        return 0;
+    } else {
+        return 1;
+    }
+}
+
+/* format <root>
+ */
+static int
+cmd_format(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_WORDS();
+
+    if (argc != 1) {
+        LOGE("Command %s requires exactly one argument\n", name);
+        return 1;
+    }
+    const char *root = argv[0];
+    ui_print("Formatting %s...\n", root);
+
+    int ret = format_root_device(root);
+    if (ret != 0) {
+        LOGE("Can't format %s\n", root);
+        return 1;
+    }
+
+    return 0;
+}
+
+/* delete <file1> [<fileN> ...]
+ * delete_recursive <file-or-dir1> [<file-or-dirN> ...]
+ *
+ * Like "rm -f", will try to delete every named file/dir, even if
+ * earlier ones fail.  Recursive deletes that fail halfway through
+ * give up early.
+ */
+static int
+cmd_delete(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+    int nerr = 0;
+    bool recurse;
+
+    if (argc < 1) {
+        LOGE("Command %s requires at least one argument\n", name);
+        return 1;
+    }
+
+    recurse = (strcmp(name, "delete_recursive") == 0);
+    ui_print("Deleting files...\n");
+//xxx permissions
+
+    int i;
+    for (i = 0; i < argc; i++) {
+        const char *root_path = argv[i];
+        char pathbuf[PATH_MAX];
+        const char *path;
+
+        /* This guarantees that all paths use "SYSTEM:"-style roots;
+         * plain paths won't make it through translate_root_path().
+         */
+        path = translate_root_path(root_path, pathbuf, sizeof(pathbuf));
+        if (path != NULL) {
+            int ret = ensure_root_path_mounted(root_path);
+            if (ret < 0) {
+                LOGW("Can't mount volume to delete \"%s\"\n", root_path);
+                nerr++;
+                continue;
+            }
+            if (recurse) {
+                ret = dirUnlinkHierarchy(path);
+            } else {
+                ret = unlink(path);
+            }
+            if (ret != 0 && errno != ENOENT) {
+                LOGW("Can't delete %s\n(%s)\n", path, strerror(errno));
+                nerr++;
+            }
+        } else {
+            nerr++;
+        }
+    }
+//TODO: add a way to fail if a delete didn't work
+
+    return 0;
+}
+
+typedef struct {
+    int num_done;
+    int num_total;
+} ExtractContext;
+
+static void extract_count_cb(const char *fn, void *cookie)
+{
+   ++((ExtractContext*) cookie)->num_total;
+}
+
+static void extract_cb(const char *fn, void *cookie)
+{
+    // minzip writes the filename to the log, so we don't need to
+    ExtractContext *ctx = (ExtractContext*) cookie;
+    ui_set_progress((float) ++ctx->num_done / ctx->num_total);
+}
+
+/* copy_dir <src-dir> <dst-dir> [<timestamp>]
+ *
+ * The contents of <src-dir> will become the contents of <dst-dir>.
+ * The original contents of <dst-dir> are preserved unless something
+ * in <src-dir> overwrote them.
+ *
+ * e.g., for "copy_dir PKG:system SYSTEM:", the file "PKG:system/a"
+ * would be copied to "SYSTEM:a".
+ *
+ * The specified timestamp (in decimal seconds since 1970) will be used,
+ * or a fixed default timestamp will be supplied otherwise.
+ */
+static int
+cmd_copy_dir(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_WORDS();
+//xxx permissions
+
+    // To create a consistent system image, never use the clock for timestamps.
+    struct utimbuf timestamp = { 1217592000, 1217592000 };  // 8/1/2008 default
+    if (argc == 3) {
+        char *end;
+        time_t value = strtoul(argv[2], &end, 0);
+        if (value == 0 || end[0] != '\0') {
+            LOGE("Command %s: invalid timestamp \"%s\"\n", name, argv[2]);
+            return 1;
+        } else if (value < timestamp.modtime) {
+            LOGE("Command %s: timestamp \"%s\" too early\n", name, argv[2]);
+            return 1;
+        }
+        timestamp.modtime = timestamp.actime = value;
+    } else if (argc != 2) {
+        LOGE("Command %s requires exactly two arguments\n", name);
+        return 1;
+    }
+
+    // Use 40% of the progress bar (80% post-verification) by default
+    ui_print("Copying files...\n");
+    if (!gDidShowProgress) ui_show_progress(DEFAULT_FILES_PROGRESS_FRACTION, 0);
+
+    /* Mount the destination volume if it isn't already.
+     */
+    const char *dst_root_path = argv[1];
+    int ret = ensure_root_path_mounted(dst_root_path);
+    if (ret < 0) {
+        LOGE("Can't mount %s\n", dst_root_path);
+        return 1;
+    }
+
+    /* Get the real target path.
+     */
+    char dstpathbuf[PATH_MAX];
+    const char *dst_path;
+    dst_path = translate_root_path(dst_root_path,
+            dstpathbuf, sizeof(dstpathbuf));
+    if (dst_path == NULL) {
+        LOGE("Command %s: bad destination path \"%s\"\n", name, dst_root_path);
+        return 1;
+    }
+
+    /* Try to copy the directory.  The source may be inside a package.
+     */
+    const char *src_root_path = argv[0];
+    char srcpathbuf[PATH_MAX];
+    const char *src_path;
+    if (is_package_root_path(src_root_path)) {
+        const ZipArchive *package;
+        src_path = translate_package_root_path(src_root_path,
+                srcpathbuf, sizeof(srcpathbuf), &package);
+        if (src_path == NULL) {
+            LOGE("Command %s: bad source path \"%s\"\n", name, src_root_path);
+            return 1;
+        }
+
+        /* Extract the files.  Set MZ_EXTRACT_FILES_ONLY, because only files
+         * are validated by the signature.  Do a dry run first to count how
+         * many there are (and find some errors early).
+         */
+        ExtractContext ctx;
+        ctx.num_done = 0;
+        ctx.num_total = 0;
+
+        if (!mzExtractRecursive(package, src_path, dst_path,
+                    MZ_EXTRACT_FILES_ONLY | MZ_EXTRACT_DRY_RUN,
+                    &timestamp, extract_count_cb, (void *) &ctx) ||
+            !mzExtractRecursive(package, src_path, dst_path,
+                    MZ_EXTRACT_FILES_ONLY,
+                    &timestamp, extract_cb, (void *) &ctx)) {
+            LOGW("Command %s: couldn't extract \"%s\" to \"%s\"\n",
+                    name, src_root_path, dst_root_path);
+            return 1;
+        }
+    } else {
+        LOGE("Command %s: non-package source path \"%s\" not yet supported\n",
+                name, src_root_path);
+//xxx mount the src volume
+//xxx
+        return 255;
+    }
+
+    return 0;
+}
+
+/* run_program <program-file> [<args> ...]
+ *
+ * Run an external program included in the update package.
+ */
+static int
+cmd_run_program(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+
+    if (argc < 1) {
+        LOGE("Command %s requires at least one argument\n", name);
+        return 1;
+    }
+
+    // Copy the program file to temporary storage.
+    if (!is_package_root_path(argv[0])) {
+        LOGE("Command %s: non-package program file \"%s\" not supported\n",
+                name, argv[0]);
+        return 1;
+    }
+
+    char path[PATH_MAX];
+    const ZipArchive *package;
+    if (!translate_package_root_path(argv[0], path, sizeof(path), &package)) {
+        LOGE("Command %s: bad source path \"%s\"\n", name, argv[0]);
+        return 1;
+    }
+
+    const ZipEntry *entry = mzFindZipEntry(package, path);
+    if (entry == NULL) {
+        LOGE("Can't find %s\n", path);
+        return 1;
+    }
+
+    static const char *binary = "/tmp/run_program_binary";
+    unlink(binary);  // just to be sure
+    int fd = creat(binary, 0755);
+    if (fd < 0) {
+        LOGE("Can't make %s\n", binary);
+        return 1;
+    }
+    bool ok = mzExtractZipEntryToFile(package, entry, fd);
+    close(fd);
+
+    if (!ok) {
+        LOGE("Can't copy %s\n", path);
+        return 1;
+    }
+
+    // Create a copy of argv to NULL-terminate it, as execv requires
+    char **args = (char **) malloc(sizeof(char*) * (argc + 1));
+    memcpy(args, argv, sizeof(char*) * argc);
+    args[argc] = NULL;
+
+    pid_t pid = fork();
+    if (pid == 0) {
+        execv(binary, args);
+        fprintf(stderr, "E:Can't run %s\n(%s)\n", binary, strerror(errno));
+        _exit(-1);
+    }
+
+    int status;
+    waitpid(pid, &status, 0);
+    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
+        return 0;
+    } else {
+        LOGE("Error in %s\n(Status %d)\n", path, status);
+        return 1;
+    }
+}
+
+/* set_perm <uid> <gid> <mode> <path> [... <pathN>]
+ * set_perm_recursive <uid> <gid> <dir-mode> <file-mode> <path> [... <pathN>]
+ *
+ * Like "chmod", "chown" and "chgrp" all in one, set ownership and permissions
+ * of single files or entire directory trees.  Any error causes failure.
+ * User, group, and modes must all be integer values (hex or octal OK).
+ */
+static int
+cmd_set_perm(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+    bool recurse = !strcmp(name, "set_perm_recursive");
+
+    int min_args = 4 + (recurse ? 1 : 0);
+    if (argc < min_args) {
+        LOGE("Command %s requires at least %d args\n", name, min_args);
+        return 1;
+    }
+
+    // All the arguments except the path(s) are numeric.
+    int i, n[min_args - 1];
+    for (i = 0; i < min_args - 1; ++i) {
+        char *end;
+        n[i] = strtoul(argv[i], &end, 0);
+        if (end[0] != '\0' || argv[i][0] == '\0') {
+            LOGE("Command %s: invalid argument \"%s\"\n", name, argv[i]);
+            return 1;
+        }
+    }
+
+    for (i = min_args - 1; i < min_args; ++i) {
+        char path[PATH_MAX];
+        if (translate_root_path(argv[i], path, sizeof(path)) == NULL) {
+            LOGE("Command %s: bad path \"%s\"\n", name, argv[i]);
+            return 1;
+        }
+
+        if (ensure_root_path_mounted(argv[i])) {
+            LOGE("Can't mount %s\n", argv[i]);
+            return 1;
+        }
+
+        if (recurse
+                ? dirSetHierarchyPermissions(path, n[0], n[1], n[2], n[3])
+                : (chown(path, n[0], n[1]) || chmod(path, n[2]))) {
+           LOGE("Can't chown/mod %s\n(%s)\n", path, strerror(errno));
+           return 1;
+        }
+    }
+
+    return 0;
+}
+
+/* show_progress <fraction> <duration>
+ *
+ * Use <fraction> of the on-screen progress meter for the next operation,
+ * automatically advancing the meter over <duration> seconds (or more rapidly
+ * if the actual rate of progress can be determined).
+ */
+static int
+cmd_show_progress(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+
+    if (argc != 2) {
+        LOGE("Command %s requires exactly two arguments\n", name);
+        return 1;
+    }
+
+    char *end;
+    double fraction = strtod(argv[0], &end);
+    if (end[0] != '\0' || argv[0][0] == '\0' || fraction < 0 || fraction > 1) {
+        LOGE("Command %s: invalid fraction \"%s\"\n", name, argv[0]);
+        return 1;
+    }
+
+    int duration = strtoul(argv[1], &end, 0);
+    if (end[0] != '\0' || argv[0][0] == '\0') {
+        LOGE("Command %s: invalid duration \"%s\"\n", name, argv[1]);
+        return 1;
+    }
+
+    // Half of the progress bar is taken by verification,
+    // so everything that happens during installation is scaled.
+    ui_show_progress(fraction * (1 - VERIFICATION_PROGRESS_FRACTION), duration);
+    gDidShowProgress = 1;
+    return 0;
+}
+
+/* symlink <link-target> <link-path>
+ *
+ * Create a symlink, like "ln -s".  The link path must not exist already.
+ * Note that <link-path> is in root:path format, but <link-target> is
+ * for the target filesystem (and may be relative).
+ */
+static int
+cmd_symlink(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+
+    if (argc != 2) {
+        LOGE("Command %s requires exactly two arguments\n", name);
+        return 1;
+    }
+
+    char path[PATH_MAX];
+    if (translate_root_path(argv[1], path, sizeof(path)) == NULL) {
+        LOGE("Command %s: bad path \"%s\"\n", name, argv[1]);
+        return 1;
+    }
+
+    if (ensure_root_path_mounted(argv[1])) {
+        LOGE("Can't mount %s\n", argv[1]);
+        return 1;
+    }
+
+    if (symlink(argv[0], path)) {
+        LOGE("Can't symlink %s\n", path);
+        return 1;
+    }
+
+    return 0;
+}
+
+struct FirmwareContext {
+    size_t total_bytes, done_bytes;
+    char *data;
+};
+
+static bool firmware_fn(const unsigned char *data, int data_len, void *cookie)
+{
+    struct FirmwareContext *context = (struct FirmwareContext*) cookie;
+    if (context->done_bytes + data_len > context->total_bytes) {
+        LOGE("Data overrun in firmware\n");
+        return false;  // Should not happen, but let's be safe.
+    }
+
+    memcpy(context->data + context->done_bytes, data, data_len);
+    context->done_bytes += data_len;
+    ui_set_progress(context->done_bytes * 1.0 / context->total_bytes);
+    return true;
+}
+
+/* write_radio_image <src-image>
+ * write_hboot_image <src-image>
+ * Doesn't actually take effect until the rest of installation finishes.
+ */
+static int
+cmd_write_firmware_image(const char *name, void *cookie,
+        int argc, const char *argv[], PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+
+    if (argc != 1) {
+        LOGE("Command %s requires exactly one argument\n", name);
+        return 1;
+    }
+
+    const char *type;
+    if (!strcmp(name, "write_radio_image")) {
+        type = "radio";
+    } else if (!strcmp(name, "write_hboot_image")) {
+        type = "hboot";
+    } else {
+        LOGE("Unknown firmware update command %s\n", name);
+        return 1;
+    }
+
+    if (!is_package_root_path(argv[0])) {
+        LOGE("Command %s: non-package image file \"%s\" not supported\n",
+                name, argv[0]);
+        return 1;
+    }
+
+    ui_print("Extracting %s image...\n", type);
+    char path[PATH_MAX];
+    const ZipArchive *package;
+    if (!translate_package_root_path(argv[0], path, sizeof(path), &package)) {
+        LOGE("Command %s: bad source path \"%s\"\n", name, argv[0]);
+        return 1;
+    }
+
+    const ZipEntry *entry = mzFindZipEntry(package, path);
+    if (entry == NULL) {
+        LOGE("Can't find %s\n", path);
+        return 1;
+    }
+
+    // Load the update image into RAM.
+    struct FirmwareContext context;
+    context.total_bytes = mzGetZipEntryUncompLen(entry);
+    context.done_bytes = 0;
+    context.data = malloc(context.total_bytes);
+    if (context.data == NULL) {
+        LOGE("Can't allocate %d bytes for %s\n", context.total_bytes, argv[0]);
+        return 1;
+    }
+
+    if (!mzProcessZipEntryContents(package, entry, firmware_fn, &context) ||
+        context.done_bytes != context.total_bytes) {
+        LOGE("Can't read %s\n", argv[0]);
+        free(context.data);
+        return 1;
+    }
+
+    if (remember_firmware_update(type, context.data, context.total_bytes)) {
+        LOGE("Can't store %s image\n", type);
+        free(context.data);
+        return 1;
+    }
+
+    return 0;
+}
+
+static bool write_raw_image_process_fn(
+        const unsigned char *data,
+        int data_len, void *ctx)
+{
+    int r = mtd_write_data((MtdWriteContext*)ctx, (const char *)data, data_len);
+    if (r == data_len) return true;
+    LOGE("%s\n", strerror(errno));
+    return false;
+}
+
+/* write_raw_image <src-image> <dest-root>
+ */
+static int
+cmd_write_raw_image(const char *name, void *cookie,
+        int argc, const char *argv[], PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_WORDS();
+//xxx permissions
+
+    if (argc != 2) {
+        LOGE("Command %s requires exactly two arguments\n", name);
+        return 1;
+    }
+
+    // Use 10% of the progress bar (20% post-verification) by default
+    const char *src_root_path = argv[0];
+    const char *dst_root_path = argv[1];
+    ui_print("Writing %s...\n", dst_root_path);
+    if (!gDidShowProgress) ui_show_progress(DEFAULT_IMAGE_PROGRESS_FRACTION, 0);
+
+    /* Find the source image, which is probably in a package.
+     */
+    if (!is_package_root_path(src_root_path)) {
+        LOGE("Command %s: non-package source path \"%s\" not yet supported\n",
+                name, src_root_path);
+        return 255;
+    }
+
+    /* Get the package.
+     */
+    char srcpathbuf[PATH_MAX];
+    const char *src_path;
+    const ZipArchive *package;
+    src_path = translate_package_root_path(src_root_path,
+            srcpathbuf, sizeof(srcpathbuf), &package);
+    if (src_path == NULL) {
+        LOGE("Command %s: bad source path \"%s\"\n", name, src_root_path);
+        return 1;
+    }
+
+    /* Get the entry.
+     */
+    const ZipEntry *entry = mzFindZipEntry(package, src_path);
+    if (entry == NULL) {
+        LOGE("Missing file %s\n", src_path);
+        return 1;
+    }
+
+    /* Unmount the destination root if it isn't already.
+     */
+    int ret = ensure_root_path_unmounted(dst_root_path);
+    if (ret < 0) {
+        LOGE("Can't unmount %s\n", dst_root_path);
+        return 1;
+    }
+
+    /* Open the partition for writing.
+     */
+    const MtdPartition *partition = get_root_mtd_partition(dst_root_path);
+    if (partition == NULL) {
+        LOGE("Can't find %s\n", dst_root_path);
+        return 1;
+    }
+    MtdWriteContext *context = mtd_write_partition(partition);
+    if (context == NULL) {
+        LOGE("Can't open %s\n", dst_root_path);
+        return 1;
+    }
+
+    /* Extract and write the image.
+     */
+    bool ok = mzProcessZipEntryContents(package, entry,
+            write_raw_image_process_fn, context);
+    if (!ok) {
+        LOGE("Error writing %s\n", dst_root_path);
+        mtd_write_close(context);
+        return 1;
+    }
+
+    if (mtd_erase_blocks(context, -1) == (off_t) -1) {
+        LOGE("Error finishing %s\n", dst_root_path);
+        mtd_write_close(context);
+        return -1;
+    }
+
+    if (mtd_write_close(context)) {
+        LOGE("Error closing %s\n", dst_root_path);
+        return -1;
+    }
+    return 0;
+}
+
+/* mark <resource> dirty|clean
+ */
+static int
+cmd_mark(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_WORDS();
+//xxx when marking, save the top-level hash at the mark point
+//    so we can retry on failure.  Otherwise the hashes won't match,
+//    or someone could intentionally dirty the FS to force a downgrade
+//xxx
+    return -1;
+}
+
+/* done
+ */
+static int
+cmd_done(const char *name, void *cookie, int argc, const char *argv[],
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_WORDS();
+//xxx
+    return -1;
+}
+
+
+/*
+ * Function definitions
+ */
+
+/* compatible_with(<version>)
+ *
+ * Returns "true" if this version of the script parser and command
+ * set supports the named version.
+ */
+static int
+fn_compatible_with(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc != 1) {
+        fprintf(stderr, "%s: wrong number of arguments (%d)\n",
+                name, argc);
+        return 1;
+    }
+
+    if (!strcmp(argv[0], "0.1") || !strcmp(argv[0], "0.2")) {
+        *result = strdup("true");
+    } else {
+        *result = strdup("");
+    }
+    if (resultLen != NULL) {
+        *resultLen = strlen(*result);
+    }
+    return 0;
+}
+
+/* update_forced()
+ *
+ * Returns "true" if some system setting has determined that
+ * the update should happen no matter what.
+ */
+static int
+fn_update_forced(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc != 0) {
+        fprintf(stderr, "%s: wrong number of arguments (%d)\n",
+                name, argc);
+        return 1;
+    }
+
+    //xxx check some global or property
+    bool force = true;
+    if (force) {
+        *result = strdup("true");
+    } else {
+        *result = strdup("");
+    }
+    if (resultLen != NULL) {
+        *resultLen = strlen(*result);
+    }
+
+    return 0;
+}
+
+/* get_mark(<resource>)
+ *
+ * Returns the current mark associated with the provided resource.
+ */
+static int
+fn_get_mark(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc != 1) {
+        fprintf(stderr, "%s: wrong number of arguments (%d)\n",
+                name, argc);
+        return 1;
+    }
+
+    //xxx look up the value
+    *result = strdup("");
+    if (resultLen != NULL) {
+        *resultLen = strlen(*result);
+    }
+
+    return 0;
+}
+
+/* hash_dir(<path-to-directory>)
+ */
+static int
+fn_hash_dir(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    int ret = -1;
+
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+
+    const char *dir;
+    if (argc != 1) {
+        fprintf(stderr, "%s: wrong number of arguments (%d)\n",
+                name, argc);
+        return 1;
+    } else {
+        dir = argv[0];
+    }
+
+    if (permissions != NULL) {
+        if (dir == NULL) {
+            /* The argument is the result of another function.
+             * Assume the worst case, where the function returns
+             * the root.
+             */
+            dir = "/";
+        }
+        ret = addPermissionRequestToList(permissions, dir, true, PERM_READ);
+    } else {
+//xxx build and return the string
+        *result = strdup("hashvalue");
+        if (resultLen != NULL) {
+            *resultLen = strlen(*result);
+        }
+        ret = 0;
+    }
+
+    return ret;
+}
+
+/* matches(<str>, <str1> [, <strN>...])
+ * If <str> matches (strcmp) any of <str1>...<strN>, returns <str>,
+ * otherwise returns "".
+ *
+ * E.g., assert matches(hash_dir("/path"), "hash1", "hash2")
+ */
+static int
+fn_matches(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc < 2) {
+        fprintf(stderr, "%s: not enough arguments (%d < 2)\n",
+                name, argc);
+        return 1;
+    }
+
+    int i;
+    for (i = 1; i < argc; i++) {
+        if (strcmp(argv[0], argv[i]) == 0) {
+            *result = strdup(argv[0]);
+            if (resultLen != NULL) {
+                *resultLen = strlen(*result);
+            }
+            return 0;
+        }
+    }
+
+    *result = strdup("");
+    if (resultLen != NULL) {
+        *resultLen = 1;
+    }
+    return 0;
+}
+
+/* concat(<str>, <str1> [, <strN>...])
+ * Returns the concatenation of all strings.
+ */
+static int
+fn_concat(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(name);
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    size_t totalLen = 0;
+    int i;
+    for (i = 0; i < argc; i++) {
+        totalLen += strlen(argv[i]);
+    }
+
+    char *s = (char *)malloc(totalLen + 1);
+    if (s == NULL) {
+        return -1;
+    }
+    s[totalLen] = '\0';
+    for (i = 0; i < argc; i++) {
+        //TODO: keep track of the end to avoid walking the string each time
+        strcat(s, argv[i]);
+    }
+    *result = s;
+    if (resultLen != NULL) {
+        *resultLen = strlen(s);
+    }
+
+    return 0;
+}
+
+/* getprop(<property>)
+ * Returns the named Android system property value, or "" if not set.
+ */
+static int
+fn_getprop(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc != 1) {
+        LOGE("Command %s requires exactly one argument\n", name);
+        return 1;
+    }
+
+    char value[PROPERTY_VALUE_MAX];
+    property_get(argv[0], value, "");
+
+    *result = strdup(value);
+    if (resultLen != NULL) {
+        *resultLen = strlen(*result);
+    }
+
+    return 0;
+}
+
+/* file_contains(<filename>, <substring>)
+ * Returns "true" if the file exists and contains the specified substring.
+ */
+static int
+fn_file_contains(const char *name, void *cookie, int argc, const char *argv[],
+        char **result, size_t *resultLen,
+        PermissionRequestList *permissions)
+{
+    UNUSED(cookie);
+    CHECK_FN();
+    NO_PERMS(permissions);
+
+    if (argc != 2) {
+        LOGE("Command %s requires exactly two arguments\n", name);
+        return 1;
+    }
+
+    char pathbuf[PATH_MAX];
+    const char *root_path = argv[0];
+    const char *path = translate_root_path(root_path, pathbuf, sizeof(pathbuf));
+    if (path == NULL) {
+        LOGE("Command %s: bad path \"%s\"\n", name, root_path);
+        return 1;
+    }
+
+    if (ensure_root_path_mounted(root_path)) {
+        LOGE("Can't mount %s\n", root_path);
+        return 1;
+    }
+
+    const char *needle = argv[1];
+    char *haystack = (char*) load_file(path, NULL);
+    if (haystack == NULL) {
+        LOGI("%s: Can't read \"%s\" (%s)\n", name, path, strerror(errno));
+        *result = "";  /* File not found is not an error. */
+    } else if (strstr(haystack, needle) == NULL) {
+        LOGI("%s: Can't find \"%s\" in \"%s\"\n", name, needle, path);
+        *result = strdup("");
+        free(haystack);
+    } else {
+        *result = strdup("true");
+        free(haystack);
+    }
+
+    if (resultLen != NULL) {
+        *resultLen = strlen(*result);
+    }
+    return 0;
+}
+
+int
+register_update_commands(RecoveryCommandContext *ctx)
+{
+    int ret;
+
+    ret = commandInit();
+    if (ret < 0) return ret;
+
+    /*
+     * Commands
+     */
+
+    ret = registerCommand("assert", CMD_ARGS_BOOLEAN, cmd_assert, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("delete", CMD_ARGS_WORDS, cmd_delete, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("delete_recursive", CMD_ARGS_WORDS, cmd_delete,
+            (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("copy_dir", CMD_ARGS_WORDS,
+            cmd_copy_dir, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("run_program", CMD_ARGS_WORDS,
+            cmd_run_program, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("set_perm", CMD_ARGS_WORDS,
+            cmd_set_perm, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("set_perm_recursive", CMD_ARGS_WORDS,
+            cmd_set_perm, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("show_progress", CMD_ARGS_WORDS,
+            cmd_show_progress, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("symlink", CMD_ARGS_WORDS, cmd_symlink, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("format", CMD_ARGS_WORDS, cmd_format, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("write_radio_image", CMD_ARGS_WORDS,
+            cmd_write_firmware_image, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("write_hboot_image", CMD_ARGS_WORDS,
+            cmd_write_firmware_image, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("write_raw_image", CMD_ARGS_WORDS,
+            cmd_write_raw_image, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("mark", CMD_ARGS_WORDS, cmd_mark, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerCommand("done", CMD_ARGS_WORDS, cmd_done, (void *)ctx);
+    if (ret < 0) return ret;
+
+    /*
+     * Functions
+     */
+
+    ret = registerFunction("compatible_with", fn_compatible_with, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("update_forced", fn_update_forced, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("get_mark", fn_get_mark, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("hash_dir", fn_hash_dir, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("matches", fn_matches, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("concat", fn_concat, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("getprop", fn_getprop, (void *)ctx);
+    if (ret < 0) return ret;
+
+    ret = registerFunction("file_contains", fn_file_contains, (void *)ctx);
+    if (ret < 0) return ret;
+
+    return 0;
+}