diff options
Diffstat (limited to 'third_party/git/archive-tar.c')
| -rw-r--r-- | third_party/git/archive-tar.c | 486 |
1 files changed, 0 insertions, 486 deletions
diff --git a/third_party/git/archive-tar.c b/third_party/git/archive-tar.c deleted file mode 100644 index f1a1447ebda0..000000000000 --- a/third_party/git/archive-tar.c +++ /dev/null @@ -1,486 +0,0 @@ -/* - * Copyright (c) 2005, 2006 Rene Scharfe - */ -#include "cache.h" -#include "config.h" -#include "tar.h" -#include "archive.h" -#include "object-store.h" -#include "streaming.h" -#include "run-command.h" - -#define RECORDSIZE (512) -#define BLOCKSIZE (RECORDSIZE * 20) - -static char block[BLOCKSIZE]; -static unsigned long offset; - -static int tar_umask = 002; - -static int write_tar_filter_archive(const struct archiver *ar, - struct archiver_args *args); - -/* - * This is the max value that a ustar size header can specify, as it is fixed - * at 11 octal digits. POSIX specifies that we switch to extended headers at - * this size. - * - * Likewise for the mtime (which happens to use a buffer of the same size). - */ -#if ULONG_MAX == 0xFFFFFFFF -#define USTAR_MAX_SIZE ULONG_MAX -#else -#define USTAR_MAX_SIZE 077777777777UL -#endif -#if TIME_MAX == 0xFFFFFFFF -#define USTAR_MAX_MTIME TIME_MAX -#else -#define USTAR_MAX_MTIME 077777777777ULL -#endif - -/* 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 do_write_blocked(const void *data, unsigned long size) -{ - const char *buf = data; - - 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; - } -} - -static void finish_record(void) -{ - unsigned long tail; - tail = offset % RECORDSIZE; - if (tail) { - memset(block + offset, 0, RECORDSIZE - tail); - offset += RECORDSIZE - tail; - } - write_if_needed(); -} - -static void write_blocked(const void *data, unsigned long size) -{ - do_write_blocked(data, size); - finish_record(); -} - -/* - * 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); - } -} - -/* - * queues up writes, so that all our write(2) calls write exactly one - * full block; pads writes to RECORDSIZE - */ -static int stream_blocked(struct repository *r, const struct object_id *oid) -{ - struct git_istream *st; - enum object_type type; - unsigned long sz; - char buf[BLOCKSIZE]; - ssize_t readlen; - - st = open_istream(r, oid, &type, &sz, NULL); - if (!st) - return error(_("cannot stream blob %s"), oid_to_hex(oid)); - for (;;) { - readlen = read_istream(st, buf, sizeof(buf)); - if (readlen <= 0) - break; - do_write_blocked(buf, readlen); - } - close_istream(st); - if (!readlen) - finish_record(); - return readlen; -} - -/* - * 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, size_t valuelen) -{ - size_t orig_len = sb->len; - size_t len, tmp; - - /* "%u %s=%s\n" */ - len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; - for (tmp = 1; len / 10 >= tmp; tmp *= 10) - len++; - - strbuf_grow(sb, len); - strbuf_addf(sb, "%"PRIuMAX" %s=", (uintmax_t)len, keyword); - strbuf_add(sb, value, valuelen); - strbuf_addch(sb, '\n'); - - if (len != sb->len - orig_len) - BUG("pax extended header length miscalculated as %"PRIuMAX - ", should be %"PRIuMAX, - (uintmax_t)len, (uintmax_t)(sb->len - orig_len)); -} - -/* - * Like strbuf_append_ext_header, but for numeric values. - */ -static void strbuf_append_ext_header_uint(struct strbuf *sb, - const char *keyword, - uintmax_t value) -{ - char buf[40]; /* big enough for 2^128 in decimal, plus NUL */ - int len; - - len = xsnprintf(buf, sizeof(buf), "%"PRIuMAX, value); - strbuf_append_ext_header(sb, keyword, buf, len); -} - -static unsigned int ustar_header_chksum(const struct ustar_header *header) -{ - const unsigned char *p = (const unsigned char *)header; - unsigned int chksum = 0; - while (p < (const unsigned char *)header->chksum) - chksum += *p++; - chksum += sizeof(header->chksum) * ' '; - p += sizeof(header->chksum); - while (p < (const unsigned 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 > 1 && path[i - 1] == '/') - i--; - if (i > maxlen) - i = maxlen; - do { - i--; - } while (i > 0 && path[i] != '/'); - return i; -} - -static void prepare_header(struct archiver_args *args, - struct ustar_header *header, - unsigned int mode, unsigned long size) -{ - xsnprintf(header->mode, sizeof(header->mode), "%07o", mode & 07777); - xsnprintf(header->size, sizeof(header->size), "%011"PRIoMAX , S_ISREG(mode) ? (uintmax_t)size : (uintmax_t)0); - xsnprintf(header->mtime, sizeof(header->mtime), "%011lo", (unsigned long) args->time); - - xsnprintf(header->uid, sizeof(header->uid), "%07o", 0); - xsnprintf(header->gid, sizeof(header->gid), "%07o", 0); - strlcpy(header->uname, "root", sizeof(header->uname)); - strlcpy(header->gname, "root", sizeof(header->gname)); - xsnprintf(header->devmajor, sizeof(header->devmajor), "%07o", 0); - xsnprintf(header->devminor, sizeof(header->devminor), "%07o", 0); - - memcpy(header->magic, "ustar", 6); - memcpy(header->version, "00", 2); - - xsnprintf(header->chksum, sizeof(header->chksum), "%07o", ustar_header_chksum(header)); -} - -static void write_extended_header(struct archiver_args *args, - const struct object_id *oid, - const void *buffer, unsigned long size) -{ - struct ustar_header header; - unsigned int mode; - memset(&header, 0, sizeof(header)); - *header.typeflag = TYPEFLAG_EXT_HEADER; - mode = 0100666; - xsnprintf(header.name, sizeof(header.name), "%s.paxheader", oid_to_hex(oid)); - prepare_header(args, &header, mode, size); - write_blocked(&header, sizeof(header)); - write_blocked(buffer, size); -} - -static int write_tar_entry(struct archiver_args *args, - const struct object_id *oid, - const char *path, size_t pathlen, - unsigned int mode, - void *buffer, unsigned long size) -{ - struct ustar_header header; - struct strbuf ext_header = STRBUF_INIT; - unsigned long size_in_header; - int err = 0; - - memset(&header, 0, sizeof(header)); - - 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, oid_to_hex(oid)); - } - 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 { - xsnprintf(header.name, sizeof(header.name), "%s.data", - oid_to_hex(oid)); - strbuf_append_ext_header(&ext_header, "path", - path, pathlen); - } - } else - memcpy(header.name, path, pathlen); - - if (S_ISLNK(mode)) { - if (size > sizeof(header.linkname)) { - xsnprintf(header.linkname, sizeof(header.linkname), - "see %s.paxheader", oid_to_hex(oid)); - strbuf_append_ext_header(&ext_header, "linkpath", - buffer, size); - } else - memcpy(header.linkname, buffer, size); - } - - size_in_header = size; - if (S_ISREG(mode) && size > USTAR_MAX_SIZE) { - size_in_header = 0; - strbuf_append_ext_header_uint(&ext_header, "size", size); - } - - prepare_header(args, &header, mode, size_in_header); - - if (ext_header.len > 0) { - write_extended_header(args, oid, ext_header.buf, - ext_header.len); - } - strbuf_release(&ext_header); - write_blocked(&header, sizeof(header)); - if (S_ISREG(mode) && size > 0) { - if (buffer) - write_blocked(buffer, size); - else - err = stream_blocked(args->repo, oid); - } - return err; -} - -static void write_global_extended_header(struct archiver_args *args) -{ - const struct object_id *oid = args->commit_oid; - struct strbuf ext_header = STRBUF_INIT; - struct ustar_header header; - unsigned int mode; - - if (oid) - strbuf_append_ext_header(&ext_header, "comment", - oid_to_hex(oid), - the_hash_algo->hexsz); - if (args->time > USTAR_MAX_MTIME) { - strbuf_append_ext_header_uint(&ext_header, "mtime", - args->time); - args->time = USTAR_MAX_MTIME; - } - - if (!ext_header.len) - return; - - memset(&header, 0, sizeof(header)); - *header.typeflag = TYPEFLAG_GLOBAL_HEADER; - mode = 0100666; - xsnprintf(header.name, sizeof(header.name), "pax_global_header"); - prepare_header(args, &header, mode, ext_header.len); - write_blocked(&header, sizeof(header)); - write_blocked(ext_header.buf, ext_header.len); - strbuf_release(&ext_header); -} - -static struct archiver **tar_filters; -static int nr_tar_filters; -static int alloc_tar_filters; - -static struct archiver *find_tar_filter(const char *name, size_t len) -{ - int i; - for (i = 0; i < nr_tar_filters; i++) { - struct archiver *ar = tar_filters[i]; - if (!strncmp(ar->name, name, len) && !ar->name[len]) - return ar; - } - return NULL; -} - -static int tar_filter_config(const char *var, const char *value, void *data) -{ - struct archiver *ar; - const char *name; - const char *type; - size_t namelen; - - if (parse_config_key(var, "tar", &name, &namelen, &type) < 0 || !name) - return 0; - - ar = find_tar_filter(name, namelen); - if (!ar) { - ar = xcalloc(1, sizeof(*ar)); - ar->name = xmemdupz(name, namelen); - ar->write_archive = write_tar_filter_archive; - ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS; - ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters); - tar_filters[nr_tar_filters++] = ar; - } - - if (!strcmp(type, "command")) { - if (!value) - return config_error_nonbool(var); - free(ar->data); - ar->data = xstrdup(value); - return 0; - } - if (!strcmp(type, "remote")) { - if (git_config_bool(var, value)) - ar->flags |= ARCHIVER_REMOTE; - else - ar->flags &= ~ARCHIVER_REMOTE; - return 0; - } - - return 0; -} - -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 tar_filter_config(var, value, cb); -} - -static int write_tar_archive(const struct archiver *ar, - struct archiver_args *args) -{ - int err = 0; - - write_global_extended_header(args); - err = write_archive_entries(args, write_tar_entry); - if (!err) - write_trailer(); - return err; -} - -static int write_tar_filter_archive(const struct archiver *ar, - struct archiver_args *args) -{ - struct strbuf cmd = STRBUF_INIT; - struct child_process filter = CHILD_PROCESS_INIT; - const char *argv[2]; - int r; - - if (!ar->data) - BUG("tar-filter archiver called with no filter defined"); - - strbuf_addstr(&cmd, ar->data); - if (args->compression_level >= 0) - strbuf_addf(&cmd, " -%d", args->compression_level); - - argv[0] = cmd.buf; - argv[1] = NULL; - filter.argv = argv; - filter.use_shell = 1; - filter.in = -1; - - if (start_command(&filter) < 0) - die_errno(_("unable to start '%s' filter"), argv[0]); - close(1); - if (dup2(filter.in, 1) < 0) - die_errno(_("unable to redirect descriptor")); - close(filter.in); - - r = write_tar_archive(ar, args); - - close(1); - if (finish_command(&filter) != 0) - die(_("'%s' filter reported error"), argv[0]); - - strbuf_release(&cmd); - return r; -} - -static struct archiver tar_archiver = { - "tar", - write_tar_archive, - ARCHIVER_REMOTE -}; - -void init_tar_archiver(void) -{ - int i; - register_archiver(&tar_archiver); - - tar_filter_config("tar.tgz.command", "gzip -cn", NULL); - tar_filter_config("tar.tgz.remote", "true", NULL); - tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL); - tar_filter_config("tar.tar.gz.remote", "true", NULL); - git_config(git_tar_config, NULL); - for (i = 0; i < nr_tar_filters; i++) { - /* omit any filters that never had a command configured */ - if (tar_filters[i]->data) - register_archiver(tar_filters[i]); - } -} |