X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=tar-tree.c;h=fc60a90873d1928ce3ada6d26f0a0ae571d43773;hb=360204c324ca9178e2bcb4d75f3986201f8ac7e1;hp=37cd336929e38b40220d958665342e4070de68b3;hpb=ae64bbc18c80bdad36c53336ba4f724ce128efca;p=git.git diff --git a/tar-tree.c b/tar-tree.c index 37cd3369..fc60a908 100644 --- a/tar-tree.c +++ b/tar-tree.c @@ -3,7 +3,7 @@ */ #include #include "cache.h" -#include "diff.h" +#include "tree-walk.h" #include "commit.h" #include "strbuf.h" #include "tar.h" @@ -11,22 +11,13 @@ #define RECORDSIZE (512) #define BLOCKSIZE (RECORDSIZE * 20) -#define EXT_HEADER_PATH 1 -#define EXT_HEADER_LINKPATH 2 - static const char tar_tree_usage[] = "git-tar-tree [basedir]"; static char block[BLOCKSIZE]; static unsigned long offset; -static const char *basedir; static time_t archive_time; -struct path_prefix { - struct path_prefix *prev; - const char *name; -}; - /* tries hard to write, either succeeds or dies in the attempt */ static void reliable_write(void *buf, unsigned long size) { @@ -103,7 +94,6 @@ static void write_blocked(void *buf, unsigned long size) } if (size) { memcpy(block + offset, buf, size); - buf += size; offset += size; } tail = offset % RECORDSIZE; @@ -114,6 +104,18 @@ static void write_blocked(void *buf, unsigned long size) write_if_needed(); } +static void strbuf_append_string(struct strbuf *sb, const char *s) +{ + int slen = strlen(s); + int total = sb->len + slen; + if (total > sb->alloc) { + sb->buf = xrealloc(sb->buf, total); + sb->alloc = total; + } + memcpy(sb->buf + sb->len, s, slen); + sb->len = total; +} + /* * pax extended header records have the format "%u %s=%s\n". %u contains * the size of the whole string (including the %u), the first %s is the @@ -158,6 +160,16 @@ static unsigned int ustar_header_chksum(const struct ustar_header *header) return chksum; } +static int get_path_prefix(const struct strbuf *path, int maxlen) +{ + int i = path->len; + if (i > maxlen) + i = maxlen; + while (i > 0 && path->buf[i] != '/') + i--; + return i; +} + static void write_entry(const unsigned char *sha1, struct strbuf *path, unsigned int mode, void *buffer, unsigned long size) { @@ -192,9 +204,17 @@ static void write_entry(const unsigned char *sha1, struct strbuf *path, return; } if (path->len > sizeof(header.name)) { - sprintf(header.name, "%s.data", sha1_to_hex(sha1)); - strbuf_append_ext_header(&ext_header, "path", - path->buf, path->len); + int plen = get_path_prefix(path, sizeof(header.prefix)); + int rest = path->len - plen - 1; + if (plen > 0 && rest <= sizeof(header.name)) { + memcpy(header.prefix, path->buf, plen); + memcpy(header.name, path->buf + plen + 1, rest); + } else { + sprintf(header.name, "%s.data", + sha1_to_hex(sha1)); + strbuf_append_ext_header(&ext_header, "path", + path->buf, path->len); + } } else memcpy(header.name, path->buf, path->len); } @@ -235,122 +255,6 @@ static void write_entry(const unsigned char *sha1, struct strbuf *path, write_blocked(buffer, size); } -static void append_string(char **p, const char *s) -{ - unsigned int len = strlen(s); - memcpy(*p, s, len); - *p += len; -} - -static void append_char(char **p, char c) -{ - **p = c; - *p += 1; -} - -static void append_path_prefix(char **buffer, struct path_prefix *prefix) -{ - if (!prefix) - return; - append_path_prefix(buffer, prefix->prev); - append_string(buffer, prefix->name); - append_char(buffer, '/'); -} - -static unsigned int path_prefix_len(struct path_prefix *prefix) -{ - if (!prefix) - return 0; - return path_prefix_len(prefix->prev) + strlen(prefix->name) + 1; -} - -static void append_path(char **p, int is_dir, const char *basepath, - struct path_prefix *prefix, const char *path) -{ - if (basepath) { - append_string(p, basepath); - append_char(p, '/'); - } - append_path_prefix(p, prefix); - append_string(p, path); - if (is_dir) - append_char(p, '/'); -} - -static unsigned int path_len(int is_dir, const char *basepath, - struct path_prefix *prefix, const char *path) -{ - unsigned int len = 0; - if (basepath) - len += strlen(basepath) + 1; - len += path_prefix_len(prefix) + strlen(path); - if (is_dir) - len++; - return len; -} - -static void append_extended_header_prefix(char **p, unsigned int size, - const char *keyword) -{ - int len = sprintf(*p, "%u %s=", size, keyword); - *p += len; -} - -static unsigned int extended_header_len(const char *keyword, - unsigned int valuelen) -{ - /* "%u %s=%s\n" */ - unsigned int len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; - if (len > 9) - len++; - if (len > 99) - len++; - return len; -} - -static void append_extended_header(char **p, const char *keyword, - const char *value, unsigned int len) -{ - unsigned int size = extended_header_len(keyword, len); - append_extended_header_prefix(p, size, keyword); - memcpy(*p, value, len); - *p += len; - append_char(p, '\n'); -} - -static void write_header(const unsigned char *, char, const char *, struct path_prefix *, - const char *, unsigned int, void *, unsigned long); - -/* stores a pax extended header directly in the block buffer */ -static void write_extended_header(const char *headerfilename, int is_dir, - unsigned int flags, const char *basepath, - struct path_prefix *prefix, - const char *path, unsigned int namelen, - void *content, unsigned int contentsize) -{ - char *buffer, *p; - unsigned int pathlen, size, linkpathlen = 0; - - size = pathlen = extended_header_len("path", namelen); - if (flags & EXT_HEADER_LINKPATH) { - linkpathlen = extended_header_len("linkpath", contentsize); - size += linkpathlen; - } - write_header(NULL, TYPEFLAG_EXT_HEADER, NULL, NULL, headerfilename, - 0100600, NULL, size); - - buffer = p = malloc(size); - if (!buffer) - die("git-tar-tree: %s", strerror(errno)); - append_extended_header_prefix(&p, pathlen, "path"); - append_path(&p, is_dir, basepath, prefix, path); - append_char(&p, '\n'); - if (flags & EXT_HEADER_LINKPATH) - append_extended_header(&p, "linkpath", content, contentsize); - write_blocked(buffer, size); - free(buffer); -} - static void write_global_extended_header(const unsigned char *sha1) { struct strbuf ext_header; @@ -361,100 +265,9 @@ static void write_global_extended_header(const unsigned char *sha1) free(ext_header.buf); } -/* stores a ustar header directly in the block buffer */ -static void write_header(const unsigned char *sha1, char typeflag, const char *basepath, - struct path_prefix *prefix, const char *path, - unsigned int mode, void *buffer, unsigned long size) -{ - unsigned int namelen; - char *header = NULL; - unsigned int checksum = 0; - int i; - unsigned int ext_header = 0; - - if (typeflag == TYPEFLAG_AUTO) { - if (S_ISDIR(mode)) - typeflag = TYPEFLAG_DIR; - else if (S_ISLNK(mode)) - typeflag = TYPEFLAG_LNK; - else - typeflag = TYPEFLAG_REG; - } - - namelen = path_len(S_ISDIR(mode), basepath, prefix, path); - if (namelen > 100) - ext_header |= EXT_HEADER_PATH; - if (typeflag == TYPEFLAG_LNK && size > 100) - ext_header |= EXT_HEADER_LINKPATH; - - /* the extended header must be written before the normal one */ - if (ext_header) { - char headerfilename[51]; - sprintf(headerfilename, "%s.paxheader", sha1_to_hex(sha1)); - write_extended_header(headerfilename, S_ISDIR(mode), - ext_header, basepath, prefix, path, - namelen, buffer, size); - } - - header = get_record(); - - if (ext_header) { - sprintf(header, "%s.data", sha1_to_hex(sha1)); - } else { - char *p = header; - append_path(&p, S_ISDIR(mode), basepath, prefix, path); - } - - if (typeflag == TYPEFLAG_LNK) { - if (ext_header & EXT_HEADER_LINKPATH) { - sprintf(&header[157], "see %s.paxheader", - sha1_to_hex(sha1)); - } else { - if (buffer) - strncpy(&header[157], buffer, size); - } - } - - if (S_ISDIR(mode)) - mode |= 0777; - else if (S_ISREG(mode)) - mode |= (mode & 0100) ? 0777 : 0666; - else if (S_ISLNK(mode)) - mode |= 0777; - sprintf(&header[100], "%07o", mode & 07777); - - /* XXX: should we provide more meaningful info here? */ - sprintf(&header[108], "%07o", 0); /* uid */ - sprintf(&header[116], "%07o", 0); /* gid */ - strncpy(&header[265], "git", 31); /* uname */ - strncpy(&header[297], "git", 31); /* gname */ - - if (S_ISDIR(mode) || S_ISLNK(mode)) - size = 0; - sprintf(&header[124], "%011lo", size); - sprintf(&header[136], "%011lo", archive_time); - - header[156] = typeflag; - - memcpy(&header[257], "ustar", 6); - memcpy(&header[263], "00", 2); - - sprintf(&header[329], "%07o", 0); /* devmajor */ - sprintf(&header[337], "%07o", 0); /* devminor */ - - memset(&header[148], ' ', 8); - for (i = 0; i < RECORDSIZE; i++) - checksum += header[i]; - sprintf(&header[148], "%07o", checksum & 0x1fffff); - - write_if_needed(); -} - -static void traverse_tree(struct tree_desc *tree, - struct path_prefix *prefix) +static void traverse_tree(struct tree_desc *tree, struct strbuf *path) { - struct path_prefix this_prefix; - this_prefix.prev = prefix; + int pathlen = path->len; while (tree->size) { const char *name; @@ -470,16 +283,19 @@ static void traverse_tree(struct tree_desc *tree, eltbuf = read_sha1_file(sha1, elttype, &eltsize); if (!eltbuf) die("cannot read %s", sha1_to_hex(sha1)); - write_header(sha1, TYPEFLAG_AUTO, basedir, - prefix, name, mode, eltbuf, eltsize); + + path->len = pathlen; + strbuf_append_string(path, name); + if (S_ISDIR(mode)) + strbuf_append_string(path, "/"); + + write_entry(sha1, path, mode, eltbuf, eltsize); + if (S_ISDIR(mode)) { struct tree_desc subtree; subtree.buf = eltbuf; subtree.size = eltsize; - this_prefix.name = name; - traverse_tree(&subtree, &this_prefix); - } else if (!S_ISLNK(mode)) { - write_blocked(eltbuf, eltsize); + traverse_tree(&subtree, path); } free(eltbuf); } @@ -490,12 +306,19 @@ int main(int argc, char **argv) unsigned char sha1[20], tree_sha1[20]; struct commit *commit; struct tree_desc tree; + struct strbuf current_path; + + current_path.buf = xmalloc(PATH_MAX); + current_path.alloc = PATH_MAX; + current_path.len = current_path.eof = 0; setup_git_directory(); + git_config(git_default_config); switch (argc) { case 3: - basedir = argv[2]; + strbuf_append_string(¤t_path, argv[2]); + strbuf_append_string(¤t_path, "/"); /* FALLTHROUGH */ case 2: if (get_sha1(argv[1], sha1) < 0) @@ -509,18 +332,19 @@ int main(int argc, char **argv) if (commit) { write_global_extended_header(commit->object.sha1); archive_time = commit->date; - } - tree.buf = read_object_with_reference(sha1, "tree", &tree.size, + } else + archive_time = time(NULL); + + tree.buf = read_object_with_reference(sha1, tree_type, &tree.size, tree_sha1); if (!tree.buf) die("not a reference to a tag, commit or tree object: %s", sha1_to_hex(sha1)); - if (!archive_time) - archive_time = time(NULL); - if (basedir) - write_header(tree_sha1, TYPEFLAG_DIR, NULL, NULL, - basedir, 040777, NULL, 0); - traverse_tree(&tree, NULL); + + if (current_path.len > 0) + write_entry(tree_sha1, ¤t_path, 040777, NULL, 0); + traverse_tree(&tree, ¤t_path); write_trailer(); + free(current_path.buf); return 0; }