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/* * Copyright (c) 2005, 2006 Rene Scharfe */ #include "cache.h" #include "tar.h" #include "archive.h" #define RECORDSIZE (512) #define BLOCKSIZE (RECORDSIZE * 20) static char block[BLOCKSIZE]; static unsigned long offset; static int tar_umask = 002; /* 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); } } /* * 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) { int len, tmp; /* "%u %s=%s\n" */ len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; for (tmp = len; tmp > 9; tmp /= 10) len++; strbuf_grow(sb, len); strbuf_addf(sb, "%u %s=", len, keyword); strbuf_add(sb, value, valuelen); strbuf_addch(sb, '\n'); } 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 size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen) { size_t i = pathlen; if (i > maxlen) i = maxlen; do { i--; } while (i > 0 && path[i] != '/'); return i; } static int write_tar_entry(struct archiver_args *args, const unsigned char *sha1, const char *path, size_t pathlen, unsigned int mode, void *buffer, unsigned long size) { struct ustar_header header; struct strbuf ext_header = STRBUF_INIT; int err = 0; memset(&header, 0, sizeof(header)); 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 (S_ISDIR(mode) || S_ISGITLINK(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 { return error("unsupported file mode: 0%o (SHA1: %s)", mode, sha1_to_hex(sha1)); } if (pathlen > sizeof(header.name)) { size_t plen = get_path_prefix(path, pathlen, sizeof(header.prefix)); size_t rest = pathlen - plen - 1; if (plen > 0 && rest <= sizeof(header.name)) { memcpy(header.prefix, path, plen); memcpy(header.name, path + plen + 1, rest); } else { sprintf(header.name, "%s.data", sha1_to_hex(sha1)); strbuf_append_ext_header(&ext_header, "path", path, pathlen); } } else memcpy(header.name, path, pathlen); } 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", (unsigned long) args->time); sprintf(header.uid, "%07o", 0); sprintf(header.gid, "%07o", 0); strlcpy(header.uname, "root", sizeof(header.uname)); strlcpy(header.gname, "root", 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) { err = write_tar_entry(args, sha1, NULL, 0, 0, ext_header.buf, ext_header.len); if (err) return err; } strbuf_release(&ext_header); write_blocked(&header, sizeof(header)); if (S_ISREG(mode) && buffer && size > 0) write_blocked(buffer, size); return err; } static int write_global_extended_header(struct archiver_args *args) { const unsigned char *sha1 = args->commit_sha1; struct strbuf ext_header = STRBUF_INIT; int err; strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40); err = write_tar_entry(args, NULL, NULL, 0, 0, ext_header.buf, ext_header.len); strbuf_release(&ext_header); return err; } static int git_tar_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "tar.umask")) { if (value && !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, cb); } int write_tar_archive(struct archiver_args *args) { int err = 0; git_config(git_tar_config, NULL); if (args->commit_sha1) err = write_global_extended_header(args); if (!err) err = write_archive_entries(args, write_tar_entry); if (!err) write_trailer(); return err; }
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