vcs-svn/svndump.c

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This source file includes following definitions.
reset_node_ctx
reset_rev_ctx
reset_dump_ctx
handle_property
die_short_read
read_props
handle_node
begin_revision
end_revision
svndump_read
init
svndump_init
svndump_init_fd
svndump_deinit
svndump_reset
/*
 * Parse and rearrange a svnadmin dump.
 * Create the dump with:
 * svnadmin dump --incremental -r<startrev>:<endrev> <repository> >outfile
 *
 * Licensed under a two-clause BSD-style license.
 * See LICENSE for details.
 */

#include "cache.h"
#include "repo_tree.h"
#include "fast_export.h"
#include "line_buffer.h"
#include "strbuf.h"
#include "svndump.h"

/*
 * Compare start of string to literal of equal length;
 * must be guarded by length test.
 */
#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)

#define REPORT_FILENO 3

#define NODEACT_REPLACE 4
#define NODEACT_DELETE 3
#define NODEACT_ADD 2
#define NODEACT_CHANGE 1
#define NODEACT_UNKNOWN 0

/* States: */
#define DUMP_CTX 0      /* dump metadata */
#define REV_CTX  1      /* revision metadata */
#define NODE_CTX 2      /* node metadata */
#define INTERNODE_CTX 3 /* between nodes */

#define DATE_RFC2822_LEN 31

static struct line_buffer input = LINE_BUFFER_INIT;

static struct {
        uint32_t action, srcRev, type;
        off_t prop_length, text_length;
        struct strbuf src, dst;
        uint32_t text_delta, prop_delta;
} node_ctx;

static struct {
        uint32_t revision;
        unsigned long timestamp;
        struct strbuf log, author, note;
} rev_ctx;

static struct {
        uint32_t version;
        struct strbuf uuid, url;
} dump_ctx;

static void reset_node_ctx(char *fname)
{
        node_ctx.type = 0;
        node_ctx.action = NODEACT_UNKNOWN;
        node_ctx.prop_length = -1;
        node_ctx.text_length = -1;
        strbuf_reset(&node_ctx.src);
        node_ctx.srcRev = 0;
        strbuf_reset(&node_ctx.dst);
        if (fname)
                strbuf_addstr(&node_ctx.dst, fname);
        node_ctx.text_delta = 0;
        node_ctx.prop_delta = 0;
}

static void reset_rev_ctx(uint32_t revision)
{
        rev_ctx.revision = revision;
        rev_ctx.timestamp = 0;
        strbuf_reset(&rev_ctx.log);
        strbuf_reset(&rev_ctx.author);
        strbuf_reset(&rev_ctx.note);
}

static void reset_dump_ctx(const char *url)
{
        strbuf_reset(&dump_ctx.url);
        if (url)
                strbuf_addstr(&dump_ctx.url, url);
        dump_ctx.version = 1;
        strbuf_reset(&dump_ctx.uuid);
}

static void handle_property(const struct strbuf *key_buf,
                                struct strbuf *val,
                                uint32_t *type_set)
{
        const char *key = key_buf->buf;
        size_t keylen = key_buf->len;

        switch (keylen + 1) {
        case sizeof("svn:log"):
                if (constcmp(key, "svn:log"))
                        break;
                if (!val)
                        die("invalid dump: unsets svn:log");
                strbuf_swap(&rev_ctx.log, val);
                break;
        case sizeof("svn:author"):
                if (constcmp(key, "svn:author"))
                        break;
                if (!val)
                        strbuf_reset(&rev_ctx.author);
                else
                        strbuf_swap(&rev_ctx.author, val);
                break;
        case sizeof("svn:date"):
                if (constcmp(key, "svn:date"))
                        break;
                if (!val)
                        die("invalid dump: unsets svn:date");
                if (parse_date_basic(val->buf, &rev_ctx.timestamp, NULL))
                        warning("invalid timestamp: %s", val->buf);
                break;
        case sizeof("svn:executable"):
        case sizeof("svn:special"):
                if (keylen == strlen("svn:executable") &&
                    constcmp(key, "svn:executable"))
                        break;
                if (keylen == strlen("svn:special") &&
                    constcmp(key, "svn:special"))
                        break;
                if (*type_set) {
                        if (!val)
                                return;
                        die("invalid dump: sets type twice");
                }
                if (!val) {
                        node_ctx.type = REPO_MODE_BLB;
                        return;
                }
                *type_set = 1;
                node_ctx.type = keylen == strlen("svn:executable") ?
                                REPO_MODE_EXE :
                                REPO_MODE_LNK;
        }
}

static void die_short_read(void)
{
        if (buffer_ferror(&input))
                die_errno("error reading dump file");
        die("invalid dump: unexpected end of file");
}

static void read_props(void)
{
        static struct strbuf key = STRBUF_INIT;
        static struct strbuf val = STRBUF_INIT;
        const char *t;
        /*
         * NEEDSWORK: to support simple mode changes like
         *      K 11
         *      svn:special
         *      V 1
         *      *
         *      D 14
         *      svn:executable
         * we keep track of whether a mode has been set and reset to
         * plain file only if not.  We should be keeping track of the
         * symlink and executable bits separately instead.
         */
        uint32_t type_set = 0;
        while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
                uint32_t len;
                const char type = t[0];
                int ch;

                if (!type || t[1] != ' ')
                        die("invalid property line: %s", t);
                len = atoi(&t[2]);
                strbuf_reset(&val);
                buffer_read_binary(&input, &val, len);
                if (val.len < len)
                        die_short_read();

                /* Discard trailing newline. */
                ch = buffer_read_char(&input);
                if (ch == EOF)
                        die_short_read();
                if (ch != '\n')
                        die("invalid dump: expected newline after %s", val.buf);

                switch (type) {
                case 'K':
                        strbuf_swap(&key, &val);
                        continue;
                case 'D':
                        handle_property(&val, NULL, &type_set);
                        continue;
                case 'V':
                        handle_property(&key, &val, &type_set);
                        strbuf_reset(&key);
                        continue;
                default:
                        die("invalid property line: %s", t);
                }
        }
}

static void handle_node(void)
{
        const uint32_t type = node_ctx.type;
        const int have_props = node_ctx.prop_length != -1;
        const int have_text = node_ctx.text_length != -1;
        /*
         * Old text for this node:
         *  NULL        - directory or bug
         *  empty_blob  - empty
         *  "<dataref>" - data retrievable from fast-import
         */
        static const char *const empty_blob = "::empty::";
        const char *old_data = NULL;
        uint32_t old_mode = REPO_MODE_BLB;

        if (node_ctx.action == NODEACT_DELETE) {
                if (have_text || have_props || node_ctx.srcRev)
                        die("invalid dump: deletion node has "
                                "copyfrom info, text, or properties");
                repo_delete(node_ctx.dst.buf);
                return;
        }
        if (node_ctx.action == NODEACT_REPLACE) {
                repo_delete(node_ctx.dst.buf);
                node_ctx.action = NODEACT_ADD;
        }
        if (node_ctx.srcRev) {
                repo_copy(node_ctx.srcRev, node_ctx.src.buf, node_ctx.dst.buf);
                if (node_ctx.action == NODEACT_ADD)
                        node_ctx.action = NODEACT_CHANGE;
        }
        if (have_text && type == REPO_MODE_DIR)
                die("invalid dump: directories cannot have text attached");

        /*
         * Find old content (old_data) and decide on the new mode.
         */
        if (node_ctx.action == NODEACT_CHANGE && !*node_ctx.dst.buf) {
                if (type != REPO_MODE_DIR)
                        die("invalid dump: root of tree is not a regular file");
                old_data = NULL;
        } else if (node_ctx.action == NODEACT_CHANGE) {
                uint32_t mode;
                old_data = repo_read_path(node_ctx.dst.buf, &mode);
                if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
                        die("invalid dump: cannot modify a directory into a file");
                if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
                        die("invalid dump: cannot modify a file into a directory");
                node_ctx.type = mode;
                old_mode = mode;
        } else if (node_ctx.action == NODEACT_ADD) {
                if (type == REPO_MODE_DIR)
                        old_data = NULL;
                else if (have_text)
                        old_data = empty_blob;
                else
                        die("invalid dump: adds node without text");
        } else {
                die("invalid dump: Node-path block lacks Node-action");
        }

        /*
         * Adjust mode to reflect properties.
         */
        if (have_props) {
                if (!node_ctx.prop_delta)
                        node_ctx.type = type;
                if (node_ctx.prop_length)
                        read_props();
        }

        /*
         * Save the result.
         */
        if (type == REPO_MODE_DIR)      /* directories are not tracked. */
                return;
        assert(old_data);
        if (old_data == empty_blob)
                /* For the fast_export_* functions, NULL means empty. */
                old_data = NULL;
        if (!have_text) {
                fast_export_modify(node_ctx.dst.buf, node_ctx.type, old_data);
                return;
        }
        if (!node_ctx.text_delta) {
                fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
                fast_export_data(node_ctx.type, node_ctx.text_length, &input);
                return;
        }
        fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
        fast_export_blob_delta(node_ctx.type, old_mode, old_data,
                                node_ctx.text_length, &input);
}

static void begin_revision(const char *remote_ref)
{
        if (!rev_ctx.revision)  /* revision 0 gets no git commit. */
                return;
        fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
                &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
                rev_ctx.timestamp, remote_ref);
}

static void end_revision(const char *note_ref)
{
        struct strbuf mark = STRBUF_INIT;
        if (rev_ctx.revision) {
                fast_export_end_commit(rev_ctx.revision);
                fast_export_begin_note(rev_ctx.revision, "remote-svn",
                                "Note created by remote-svn.", rev_ctx.timestamp, note_ref);
                strbuf_addf(&mark, ":%"PRIu32, rev_ctx.revision);
                fast_export_note(mark.buf, "inline");
                fast_export_buf_to_data(&rev_ctx.note);
        }
}

void svndump_read(const char *url, const char *local_ref, const char *notes_ref)
{
        char *val;
        char *t;
        uint32_t active_ctx = DUMP_CTX;
        uint32_t len;

        reset_dump_ctx(url);
        while ((t = buffer_read_line(&input))) {
                val = strchr(t, ':');
                if (!val)
                        continue;
                val++;
                if (*val != ' ')
                        continue;
                val++;

                /* strlen(key) + 1 */
                switch (val - t - 1) {
                case sizeof("SVN-fs-dump-format-version"):
                        if (constcmp(t, "SVN-fs-dump-format-version"))
                                continue;
                        dump_ctx.version = atoi(val);
                        if (dump_ctx.version > 3)
                                die("expected svn dump format version <= 3, found %"PRIu32,
                                    dump_ctx.version);
                        break;
                case sizeof("UUID"):
                        if (constcmp(t, "UUID"))
                                continue;
                        strbuf_reset(&dump_ctx.uuid);
                        strbuf_addstr(&dump_ctx.uuid, val);
                        break;
                case sizeof("Revision-number"):
                        if (constcmp(t, "Revision-number"))
                                continue;
                        if (active_ctx == NODE_CTX)
                                handle_node();
                        if (active_ctx == REV_CTX)
                                begin_revision(local_ref);
                        if (active_ctx != DUMP_CTX)
                                end_revision(notes_ref);
                        active_ctx = REV_CTX;
                        reset_rev_ctx(atoi(val));
                        strbuf_addf(&rev_ctx.note, "%s\n", t);
                        break;
                case sizeof("Node-path"):
                        if (constcmp(t, "Node-"))
                                continue;
                        if (!constcmp(t + strlen("Node-"), "path")) {
                                if (active_ctx == NODE_CTX)
                                        handle_node();
                                if (active_ctx == REV_CTX)
                                        begin_revision(local_ref);
                                active_ctx = NODE_CTX;
                                reset_node_ctx(val);
                                strbuf_addf(&rev_ctx.note, "%s\n", t);
                                break;
                        }
                        if (constcmp(t + strlen("Node-"), "kind"))
                                continue;
                        strbuf_addf(&rev_ctx.note, "%s\n", t);
                        if (!strcmp(val, "dir"))
                                node_ctx.type = REPO_MODE_DIR;
                        else if (!strcmp(val, "file"))
                                node_ctx.type = REPO_MODE_BLB;
                        else
                                fprintf(stderr, "Unknown node-kind: %s\n", val);
                        break;
                case sizeof("Node-action"):
                        if (constcmp(t, "Node-action"))
                                continue;
                        strbuf_addf(&rev_ctx.note, "%s\n", t);
                        if (!strcmp(val, "delete")) {
                                node_ctx.action = NODEACT_DELETE;
                        } else if (!strcmp(val, "add")) {
                                node_ctx.action = NODEACT_ADD;
                        } else if (!strcmp(val, "change")) {
                                node_ctx.action = NODEACT_CHANGE;
                        } else if (!strcmp(val, "replace")) {
                                node_ctx.action = NODEACT_REPLACE;
                        } else {
                                fprintf(stderr, "Unknown node-action: %s\n", val);
                                node_ctx.action = NODEACT_UNKNOWN;
                        }
                        break;
                case sizeof("Node-copyfrom-path"):
                        if (constcmp(t, "Node-copyfrom-path"))
                                continue;
                        strbuf_reset(&node_ctx.src);
                        strbuf_addstr(&node_ctx.src, val);
                        strbuf_addf(&rev_ctx.note, "%s\n", t);
                        break;
                case sizeof("Node-copyfrom-rev"):
                        if (constcmp(t, "Node-copyfrom-rev"))
                                continue;
                        node_ctx.srcRev = atoi(val);
                        strbuf_addf(&rev_ctx.note, "%s\n", t);
                        break;
                case sizeof("Text-content-length"):
                        if (constcmp(t, "Text") && constcmp(t, "Prop"))
                                continue;
                        if (constcmp(t + 4, "-content-length"))
                                continue;
                        {
                                char *end;
                                uintmax_t len;

                                len = strtoumax(val, &end, 10);
                                if (!isdigit(*val) || *end)
                                        die("invalid dump: non-numeric length %s", val);
                                if (len > maximum_signed_value_of_type(off_t))
                                        die("unrepresentable length in dump: %s", val);

                                if (*t == 'T')
                                        node_ctx.text_length = (off_t) len;
                                else
                                        node_ctx.prop_length = (off_t) len;
                                break;
                        }
                case sizeof("Text-delta"):
                        if (!constcmp(t, "Text-delta")) {
                                node_ctx.text_delta = !strcmp(val, "true");
                                break;
                        }
                        if (constcmp(t, "Prop-delta"))
                                continue;
                        node_ctx.prop_delta = !strcmp(val, "true");
                        break;
                case sizeof("Content-length"):
                        if (constcmp(t, "Content-length"))
                                continue;
                        len = atoi(val);
                        t = buffer_read_line(&input);
                        if (!t)
                                die_short_read();
                        if (*t)
                                die("invalid dump: expected blank line after content length header");
                        if (active_ctx == REV_CTX) {
                                read_props();
                        } else if (active_ctx == NODE_CTX) {
                                handle_node();
                                active_ctx = INTERNODE_CTX;
                        } else {
                                fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
                                if (buffer_skip_bytes(&input, len) != len)
                                        die_short_read();
                        }
                }
        }
        if (buffer_ferror(&input))
                die_short_read();
        if (active_ctx == NODE_CTX)
                handle_node();
        if (active_ctx == REV_CTX)
                begin_revision(local_ref);
        if (active_ctx != DUMP_CTX)
                end_revision(notes_ref);
}

static void init(int report_fd)
{
        fast_export_init(report_fd);
        strbuf_init(&dump_ctx.uuid, 4096);
        strbuf_init(&dump_ctx.url, 4096);
        strbuf_init(&rev_ctx.log, 4096);
        strbuf_init(&rev_ctx.author, 4096);
        strbuf_init(&rev_ctx.note, 4096);
        strbuf_init(&node_ctx.src, 4096);
        strbuf_init(&node_ctx.dst, 4096);
        reset_dump_ctx(NULL);
        reset_rev_ctx(0);
        reset_node_ctx(NULL);
        return;
}

int svndump_init(const char *filename)
{
        if (buffer_init(&input, filename))
                return error("cannot open %s: %s", filename ? filename : "NULL", strerror(errno));
        init(REPORT_FILENO);
        return 0;
}

int svndump_init_fd(int in_fd, int back_fd)
{
        if(buffer_fdinit(&input, xdup(in_fd)))
                return error("cannot open fd %d: %s", in_fd, strerror(errno));
        init(xdup(back_fd));
        return 0;
}

void svndump_deinit(void)
{
        fast_export_deinit();
        reset_dump_ctx(NULL);
        reset_rev_ctx(0);
        reset_node_ctx(NULL);
        strbuf_release(&rev_ctx.log);
        strbuf_release(&rev_ctx.author);
        strbuf_release(&rev_ctx.note);
        strbuf_release(&node_ctx.src);
        strbuf_release(&node_ctx.dst);
        if (buffer_deinit(&input))
                fprintf(stderr, "Input error\n");
        if (ferror(stdout))
                fprintf(stderr, "Output error\n");
}

void svndump_reset(void)
{
        strbuf_release(&dump_ctx.uuid);
        strbuf_release(&dump_ctx.url);
        strbuf_release(&rev_ctx.log);
        strbuf_release(&rev_ctx.author);
}
/* [<][>][^][v][top][bottom][index][help] */
root/vcs-svn/svndump.c

DEFINITIONS
