diff options
Diffstat (limited to 'builtin-tar-tree.c')
| -rw-r--r-- | builtin-tar-tree.c | 447 |
1 files changed, 51 insertions, 396 deletions
diff --git a/builtin-tar-tree.c b/builtin-tar-tree.c index 437eb726a9..4d4cfec878 100644 --- a/builtin-tar-tree.c +++ b/builtin-tar-tree.c @@ -4,413 +4,68 @@ #include <time.h> #include "cache.h" #include "commit.h" -#include "strbuf.h" #include "tar.h" #include "builtin.h" -#include "pkt-line.h" -#include "archive.h" - -#define RECORDSIZE (512) -#define BLOCKSIZE (RECORDSIZE * 20) +#include "quote.h" static const char tar_tree_usage[] = -"git-tar-tree [--remote=<repo>] <tree-ish> [basedir]"; - -static char block[BLOCKSIZE]; -static unsigned long offset; - -static time_t archive_time; -static int tar_umask; -static int verbose; - -/* writes out the whole block, but only if it is full */ -static void write_if_needed(void) -{ - if (offset == BLOCKSIZE) { - write_or_die(1, block, BLOCKSIZE); - offset = 0; - } -} - -/* - * queues up writes, so that all our write(2) calls write exactly one - * full block; pads writes to RECORDSIZE - */ -static void write_blocked(const void *data, unsigned long size) -{ - const char *buf = data; - unsigned long tail; - - if (offset) { - unsigned long chunk = BLOCKSIZE - offset; - if (size < chunk) - chunk = size; - memcpy(block + offset, buf, chunk); - size -= chunk; - offset += chunk; - buf += chunk; - write_if_needed(); - } - while (size >= BLOCKSIZE) { - write_or_die(1, buf, BLOCKSIZE); - size -= BLOCKSIZE; - buf += BLOCKSIZE; - } - if (size) { - memcpy(block + offset, buf, size); - offset += size; - } - tail = offset % RECORDSIZE; - if (tail) { - memset(block + offset, 0, RECORDSIZE - tail); - offset += RECORDSIZE - tail; - } - write_if_needed(); -} - -/* - * The end of tar archives is marked by 2*512 nul bytes and after that - * follows the rest of the block (if any). - */ -static void write_trailer(void) -{ - int tail = BLOCKSIZE - offset; - memset(block + offset, 0, tail); - write_or_die(1, block, BLOCKSIZE); - if (tail < 2 * RECORDSIZE) { - memset(block, 0, offset); - write_or_die(1, block, BLOCKSIZE); - } -} - -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 - * keyword, the second one is the value. This function constructs such a - * string and appends it to a struct strbuf. - */ -static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, - const char *value, unsigned int valuelen) -{ - char *p; - int len, total, tmp; - - /* "%u %s=%s\n" */ - len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; - for (tmp = len; tmp > 9; tmp /= 10) - len++; - - total = sb->len + len; - if (total > sb->alloc) { - sb->buf = xrealloc(sb->buf, total); - sb->alloc = total; - } - - p = sb->buf; - p += sprintf(p, "%u %s=", len, keyword); - memcpy(p, value, valuelen); - p += valuelen; - *p = '\n'; - sb->len = total; -} - -static unsigned int ustar_header_chksum(const struct ustar_header *header) -{ - char *p = (char *)header; - unsigned int chksum = 0; - while (p < header->chksum) - chksum += *p++; - chksum += sizeof(header->chksum) * ' '; - p += sizeof(header->chksum); - while (p < (char *)header + sizeof(struct ustar_header)) - chksum += *p++; - return chksum; -} - -static int get_path_prefix(const struct strbuf *path, int maxlen) -{ - int i = path->len; - if (i > maxlen) - i = maxlen; - do { - i--; - } while (i > 0 && path->buf[i] != '/'); - return i; -} - -static void write_entry(const unsigned char *sha1, struct strbuf *path, - unsigned int mode, void *buffer, unsigned long size) -{ - struct ustar_header header; - struct strbuf ext_header; - - memset(&header, 0, sizeof(header)); - ext_header.buf = NULL; - ext_header.len = ext_header.alloc = 0; - - if (!sha1) { - *header.typeflag = TYPEFLAG_GLOBAL_HEADER; - mode = 0100666; - strcpy(header.name, "pax_global_header"); - } else if (!path) { - *header.typeflag = TYPEFLAG_EXT_HEADER; - mode = 0100666; - sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1)); - } else { - if (verbose) - fprintf(stderr, "%.*s\n", path->len, path->buf); - if (S_ISDIR(mode)) { - *header.typeflag = TYPEFLAG_DIR; - mode = (mode | 0777) & ~tar_umask; - } else if (S_ISLNK(mode)) { - *header.typeflag = TYPEFLAG_LNK; - mode |= 0777; - } else if (S_ISREG(mode)) { - *header.typeflag = TYPEFLAG_REG; - mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask; - } else { - error("unsupported file mode: 0%o (SHA1: %s)", - mode, sha1_to_hex(sha1)); - return; - } - if (path->len > sizeof(header.name)) { - 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); - } - - if (S_ISLNK(mode) && buffer) { - if (size > sizeof(header.linkname)) { - sprintf(header.linkname, "see %s.paxheader", - sha1_to_hex(sha1)); - strbuf_append_ext_header(&ext_header, "linkpath", - buffer, size); - } else - memcpy(header.linkname, buffer, size); - } - - sprintf(header.mode, "%07o", mode & 07777); - sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0); - sprintf(header.mtime, "%011lo", archive_time); - - /* XXX: should we provide more meaningful info here? */ - sprintf(header.uid, "%07o", 0); - sprintf(header.gid, "%07o", 0); - strlcpy(header.uname, "git", sizeof(header.uname)); - strlcpy(header.gname, "git", sizeof(header.gname)); - sprintf(header.devmajor, "%07o", 0); - sprintf(header.devminor, "%07o", 0); - - memcpy(header.magic, "ustar", 6); - memcpy(header.version, "00", 2); - - sprintf(header.chksum, "%07o", ustar_header_chksum(&header)); - - if (ext_header.len > 0) { - write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len); - free(ext_header.buf); - } - write_blocked(&header, sizeof(header)); - if (S_ISREG(mode) && buffer && size > 0) - write_blocked(buffer, size); -} - -static void write_global_extended_header(const unsigned char *sha1) -{ - struct strbuf ext_header; - ext_header.buf = NULL; - ext_header.len = ext_header.alloc = 0; - strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40); - write_entry(NULL, NULL, 0, ext_header.buf, ext_header.len); - free(ext_header.buf); -} - -static int git_tar_config(const char *var, const char *value) -{ - if (!strcmp(var, "tar.umask")) { - if (!strcmp(value, "user")) { - tar_umask = umask(0); - umask(tar_umask); - } else { - tar_umask = git_config_int(var, value); - } - return 0; - } - return git_default_config(var, value); -} - -static int generate_tar(int argc, const char **argv, const char *prefix) -{ - struct archiver_args args; - int result; - char *base = NULL; - - git_config(git_tar_config); - - memset(&args, 0, sizeof(args)); - if (argc != 2 && argc != 3) - usage(tar_tree_usage); - if (argc == 3) { - int baselen = strlen(argv[2]); - base = xmalloc(baselen + 2); - memcpy(base, argv[2], baselen); - base[baselen] = '/'; - base[baselen + 1] = '\0'; - } - args.base = base; - parse_treeish_arg(argv + 1, &args, NULL); - - result = write_tar_archive(&args); - free(base); - - return result; -} - -static int write_tar_entry(const unsigned char *sha1, - const char *base, int baselen, - const char *filename, unsigned mode, int stage) -{ - static struct strbuf path; - int filenamelen = strlen(filename); - void *buffer; - char type[20]; - unsigned long size; - - if (!path.alloc) { - path.buf = xmalloc(PATH_MAX); - path.alloc = PATH_MAX; - path.len = path.eof = 0; - } - if (path.alloc < baselen + filenamelen) { - free(path.buf); - path.buf = xmalloc(baselen + filenamelen); - path.alloc = baselen + filenamelen; - } - memcpy(path.buf, base, baselen); - memcpy(path.buf + baselen, filename, filenamelen); - path.len = baselen + filenamelen; - if (S_ISDIR(mode)) { - strbuf_append_string(&path, "/"); - buffer = NULL; - size = 0; - } else { - buffer = read_sha1_file(sha1, type, &size); - if (!buffer) - die("cannot read %s", sha1_to_hex(sha1)); - } - - write_entry(sha1, &path, mode, buffer, size); - free(buffer); - - return READ_TREE_RECURSIVE; -} - -int write_tar_archive(struct archiver_args *args) -{ - int plen = args->base ? strlen(args->base) : 0; - - git_config(git_tar_config); - - archive_time = args->time; - verbose = args->verbose; - - if (args->commit_sha1) - write_global_extended_header(args->commit_sha1); - - if (args->base && plen > 0 && args->base[plen - 1] == '/') { - char *base = xstrdup(args->base); - int baselen = strlen(base); - - while (baselen > 0 && base[baselen - 1] == '/') - base[--baselen] = '\0'; - write_tar_entry(args->tree->object.sha1, "", 0, base, 040777, 0); - free(base); - } - read_tree_recursive(args->tree, args->base, plen, 0, - args->pathspec, write_tar_entry); - write_trailer(); - - return 0; -} - -static const char *exec = "git-upload-tar"; - -static int remote_tar(int argc, const char **argv) -{ - int fd[2], ret, len; - pid_t pid; - char buf[1024]; - char *url; - - if (argc < 3 || 4 < argc) - usage(tar_tree_usage); - - /* --remote=<repo> */ - url = xstrdup(argv[1]+9); - pid = git_connect(fd, url, exec); - if (pid < 0) - return 1; - - packet_write(fd[1], "want %s\n", argv[2]); - if (argv[3]) - packet_write(fd[1], "base %s\n", argv[3]); - packet_flush(fd[1]); - - len = packet_read_line(fd[0], buf, sizeof(buf)); - if (!len) - die("git-tar-tree: expected ACK/NAK, got EOF"); - if (buf[len-1] == '\n') - buf[--len] = 0; - if (strcmp(buf, "ACK")) { - if (5 < len && !strncmp(buf, "NACK ", 5)) - die("git-tar-tree: NACK %s", buf + 5); - die("git-tar-tree: protocol error"); - } - /* expect a flush */ - len = packet_read_line(fd[0], buf, sizeof(buf)); - if (len) - die("git-tar-tree: expected a flush"); - - /* Now, start reading from fd[0] and spit it out to stdout */ - ret = copy_fd(fd[0], 1); - close(fd[0]); - - ret |= finish_connect(pid); - return !!ret; -} +"git-tar-tree [--remote=<repo>] <tree-ish> [basedir]\n" +"*** Note that this command is now deprecated; use git-archive instead."; int cmd_tar_tree(int argc, const char **argv, const char *prefix) { - if (argc < 2) + /* + * git-tar-tree is now a wrapper around git-archive --format=tar + * + * $0 --remote=<repo> arg... ==> + * git-archive --format=tar --remote=<repo> arg... + * $0 tree-ish ==> + * git-archive --format=tar tree-ish + * $0 tree-ish basedir ==> + * git-archive --format-tar --prefix=basedir tree-ish + */ + int i; + const char **nargv = xcalloc(sizeof(*nargv), argc + 2); + char *basedir_arg; + int nargc = 0; + + nargv[nargc++] = "git-archive"; + nargv[nargc++] = "--format=tar"; + + if (2 <= argc && !strncmp("--remote=", argv[1], 9)) { + nargv[nargc++] = argv[1]; + argv++; + argc--; + } + switch (argc) { + default: usage(tar_tree_usage); - if (!strncmp("--remote=", argv[1], 9)) - return remote_tar(argc, argv); - return generate_tar(argc, argv, prefix); + break; + case 3: + /* base-path */ + basedir_arg = xmalloc(strlen(argv[2]) + 11); + sprintf(basedir_arg, "--prefix=%s/", argv[2]); + nargv[nargc++] = basedir_arg; + /* fallthru */ + case 2: + /* tree-ish */ + nargv[nargc++] = argv[1]; + } + nargv[nargc] = NULL; + + fprintf(stderr, + "*** git-tar-tree is now deprecated.\n" + "*** Running git-archive instead.\n***"); + for (i = 0; i < nargc; i++) { + fputc(' ', stderr); + sq_quote_print(stderr, nargv[i]); + } + fputc('\n', stderr); + return cmd_archive(nargc, nargv, prefix); } /* ustar header + extended global header content */ +#define RECORDSIZE (512) #define HEADERSIZE (2 * RECORDSIZE) int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix) |