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![René Scharfe](/assets/img/avatar_default.png)
Remove obsolete #includes. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
253 lines
6.3 KiB
C
253 lines
6.3 KiB
C
/*
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* Copyright (c) 2005, 2006 Rene Scharfe
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*/
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#include "cache.h"
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#include "tar.h"
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#include "archive.h"
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#define RECORDSIZE (512)
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#define BLOCKSIZE (RECORDSIZE * 20)
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static char block[BLOCKSIZE];
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static unsigned long offset;
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static int tar_umask = 002;
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/* writes out the whole block, but only if it is full */
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static void write_if_needed(void)
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{
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if (offset == BLOCKSIZE) {
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write_or_die(1, block, BLOCKSIZE);
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offset = 0;
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}
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}
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/*
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* queues up writes, so that all our write(2) calls write exactly one
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* full block; pads writes to RECORDSIZE
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*/
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static void write_blocked(const void *data, unsigned long size)
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{
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const char *buf = data;
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unsigned long tail;
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if (offset) {
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unsigned long chunk = BLOCKSIZE - offset;
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if (size < chunk)
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chunk = size;
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memcpy(block + offset, buf, chunk);
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size -= chunk;
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offset += chunk;
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buf += chunk;
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write_if_needed();
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}
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while (size >= BLOCKSIZE) {
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write_or_die(1, buf, BLOCKSIZE);
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size -= BLOCKSIZE;
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buf += BLOCKSIZE;
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}
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if (size) {
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memcpy(block + offset, buf, size);
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offset += size;
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}
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tail = offset % RECORDSIZE;
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if (tail) {
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memset(block + offset, 0, RECORDSIZE - tail);
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offset += RECORDSIZE - tail;
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}
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write_if_needed();
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}
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/*
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* The end of tar archives is marked by 2*512 nul bytes and after that
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* follows the rest of the block (if any).
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*/
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static void write_trailer(void)
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{
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int tail = BLOCKSIZE - offset;
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memset(block + offset, 0, tail);
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write_or_die(1, block, BLOCKSIZE);
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if (tail < 2 * RECORDSIZE) {
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memset(block, 0, offset);
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write_or_die(1, block, BLOCKSIZE);
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}
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}
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/*
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* pax extended header records have the format "%u %s=%s\n". %u contains
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* the size of the whole string (including the %u), the first %s is the
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* keyword, the second one is the value. This function constructs such a
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* string and appends it to a struct strbuf.
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*/
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static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword,
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const char *value, unsigned int valuelen)
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{
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int len, tmp;
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/* "%u %s=%s\n" */
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len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
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for (tmp = len; tmp > 9; tmp /= 10)
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len++;
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strbuf_grow(sb, len);
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strbuf_addf(sb, "%u %s=", len, keyword);
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strbuf_add(sb, value, valuelen);
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strbuf_addch(sb, '\n');
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}
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static unsigned int ustar_header_chksum(const struct ustar_header *header)
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{
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char *p = (char *)header;
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unsigned int chksum = 0;
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while (p < header->chksum)
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chksum += *p++;
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chksum += sizeof(header->chksum) * ' ';
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p += sizeof(header->chksum);
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while (p < (char *)header + sizeof(struct ustar_header))
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chksum += *p++;
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return chksum;
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}
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static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen)
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{
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size_t i = pathlen;
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if (i > maxlen)
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i = maxlen;
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do {
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i--;
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} while (i > 0 && path[i] != '/');
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return i;
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}
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static int write_tar_entry(struct archiver_args *args,
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const unsigned char *sha1, const char *path, size_t pathlen,
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unsigned int mode, void *buffer, unsigned long size)
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{
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struct ustar_header header;
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struct strbuf ext_header;
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int err = 0;
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memset(&header, 0, sizeof(header));
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strbuf_init(&ext_header, 0);
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if (!sha1) {
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*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
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mode = 0100666;
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strcpy(header.name, "pax_global_header");
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} else if (!path) {
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*header.typeflag = TYPEFLAG_EXT_HEADER;
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mode = 0100666;
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sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
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} else {
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if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
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*header.typeflag = TYPEFLAG_DIR;
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mode = (mode | 0777) & ~tar_umask;
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} else if (S_ISLNK(mode)) {
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*header.typeflag = TYPEFLAG_LNK;
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mode |= 0777;
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} else if (S_ISREG(mode)) {
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*header.typeflag = TYPEFLAG_REG;
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mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
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} else {
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return error("unsupported file mode: 0%o (SHA1: %s)",
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mode, sha1_to_hex(sha1));
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}
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if (pathlen > sizeof(header.name)) {
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size_t plen = get_path_prefix(path, pathlen,
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sizeof(header.prefix));
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size_t rest = pathlen - plen - 1;
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if (plen > 0 && rest <= sizeof(header.name)) {
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memcpy(header.prefix, path, plen);
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memcpy(header.name, path + plen + 1, rest);
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} else {
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sprintf(header.name, "%s.data",
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sha1_to_hex(sha1));
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strbuf_append_ext_header(&ext_header, "path",
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path, pathlen);
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}
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} else
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memcpy(header.name, path, pathlen);
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}
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if (S_ISLNK(mode) && buffer) {
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if (size > sizeof(header.linkname)) {
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sprintf(header.linkname, "see %s.paxheader",
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sha1_to_hex(sha1));
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strbuf_append_ext_header(&ext_header, "linkpath",
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buffer, size);
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} else
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memcpy(header.linkname, buffer, size);
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}
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sprintf(header.mode, "%07o", mode & 07777);
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sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
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sprintf(header.mtime, "%011lo", args->time);
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sprintf(header.uid, "%07o", 0);
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sprintf(header.gid, "%07o", 0);
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strlcpy(header.uname, "root", sizeof(header.uname));
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strlcpy(header.gname, "root", sizeof(header.gname));
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sprintf(header.devmajor, "%07o", 0);
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sprintf(header.devminor, "%07o", 0);
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memcpy(header.magic, "ustar", 6);
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memcpy(header.version, "00", 2);
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sprintf(header.chksum, "%07o", ustar_header_chksum(&header));
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if (ext_header.len > 0) {
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err = write_tar_entry(args, sha1, NULL, 0, 0, ext_header.buf,
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ext_header.len);
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if (err)
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return err;
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}
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strbuf_release(&ext_header);
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write_blocked(&header, sizeof(header));
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if (S_ISREG(mode) && buffer && size > 0)
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write_blocked(buffer, size);
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return err;
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}
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static int write_global_extended_header(struct archiver_args *args)
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{
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const unsigned char *sha1 = args->commit_sha1;
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struct strbuf ext_header;
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int err;
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strbuf_init(&ext_header, 0);
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strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
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err = write_tar_entry(args, NULL, NULL, 0, 0, ext_header.buf,
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ext_header.len);
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strbuf_release(&ext_header);
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return err;
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}
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static int git_tar_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "tar.umask")) {
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if (value && !strcmp(value, "user")) {
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tar_umask = umask(0);
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umask(tar_umask);
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} else {
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tar_umask = git_config_int(var, value);
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}
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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int write_tar_archive(struct archiver_args *args)
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{
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int err = 0;
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git_config(git_tar_config, NULL);
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if (args->commit_sha1)
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err = write_global_extended_header(args);
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if (!err)
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err = write_archive_entries(args, write_tar_entry);
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if (!err)
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write_trailer();
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return err;
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}
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