diff options
Diffstat (limited to 'vcs-svn/svndump.c')
| -rw-r--r-- | vcs-svn/svndump.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/vcs-svn/svndump.c b/vcs-svn/svndump.c new file mode 100644 index 0000000000..0899790a33 --- /dev/null +++ b/vcs-svn/svndump.c @@ -0,0 +1,508 @@ +/* + * 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 LENGTH_UNKNOWN (~0) +#define DATE_RFC2822_LEN 31 + +static struct line_buffer input = LINE_BUFFER_INIT; + +static struct { + uint32_t action, propLength, srcRev, type; + off_t 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; +} 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.propLength = LENGTH_UNKNOWN; + 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); +} + +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.propLength != LENGTH_UNKNOWN; + 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.propLength) + 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(void) +{ + 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); +} + +static void end_revision(void) +{ + if (rev_ctx.revision) + fast_export_end_commit(rev_ctx.revision); +} + +void svndump_read(const char *url) +{ + 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(); + if (active_ctx != DUMP_CTX) + end_revision(); + active_ctx = REV_CTX; + reset_rev_ctx(atoi(val)); + break; + case sizeof("Node-path"): + if (prefixcmp(t, "Node-")) + continue; + if (!constcmp(t + strlen("Node-"), "path")) { + if (active_ctx == NODE_CTX) + handle_node(); + if (active_ctx == REV_CTX) + begin_revision(); + active_ctx = NODE_CTX; + reset_node_ctx(val); + break; + } + if (constcmp(t + strlen("Node-"), "kind")) + continue; + 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; + 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); + break; + case sizeof("Node-copyfrom-rev"): + if (constcmp(t, "Node-copyfrom-rev")) + continue; + node_ctx.srcRev = atoi(val); + break; + case sizeof("Text-content-length"): + if (!constcmp(t, "Text-content-length")) { + char *end; + uintmax_t textlen; + + textlen = strtoumax(val, &end, 10); + if (!isdigit(*val) || *end) + die("invalid dump: non-numeric length %s", val); + if (textlen > maximum_signed_value_of_type(off_t)) + die("unrepresentable length in dump: %s", val); + node_ctx.text_length = (off_t) textlen; + break; + } + if (constcmp(t, "Prop-content-length")) + continue; + node_ctx.propLength = atoi(val); + 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(); + if (active_ctx != DUMP_CTX) + end_revision(); +} + +int svndump_init(const char *filename) +{ + if (buffer_init(&input, filename)) + return error("cannot open %s: %s", filename, strerror(errno)); + fast_export_init(REPORT_FILENO); + 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(&node_ctx.src, 4096); + strbuf_init(&node_ctx.dst, 4096); + reset_dump_ctx(NULL); + reset_rev_ctx(0); + reset_node_ctx(NULL); + 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(&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) +{ + fast_export_reset(); + buffer_reset(&input); + strbuf_release(&dump_ctx.uuid); + strbuf_release(&dump_ctx.url); + strbuf_release(&rev_ctx.log); + strbuf_release(&rev_ctx.author); +} |