mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
294 lines
7.5 KiB
C
294 lines
7.5 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 "commit.h"
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#include "tar.h"
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#include "builtin.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 time_t archive_time;
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static int tar_umask = 002;
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static int verbose;
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static const struct commit *commit;
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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 int get_path_prefix(const struct strbuf *path, int maxlen)
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{
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int i = path->len;
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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->buf[i] != '/');
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return i;
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}
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static void write_entry(const unsigned char *sha1, struct strbuf *path,
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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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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 (verbose)
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fprintf(stderr, "%.*s\n", (int)path->len, path->buf);
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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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error("unsupported file mode: 0%o (SHA1: %s)",
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mode, sha1_to_hex(sha1));
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return;
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}
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if (path->len > sizeof(header.name)) {
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int plen = get_path_prefix(path, sizeof(header.prefix));
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int rest = path->len - plen - 1;
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if (plen > 0 && rest <= sizeof(header.name)) {
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memcpy(header.prefix, path->buf, plen);
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memcpy(header.name, path->buf + 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->buf, path->len);
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}
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} else
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memcpy(header.name, path->buf, path->len);
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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", archive_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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write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len);
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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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}
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static void write_global_extended_header(const unsigned char *sha1)
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{
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struct strbuf ext_header;
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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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write_entry(NULL, NULL, 0, ext_header.buf, ext_header.len);
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strbuf_release(&ext_header);
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}
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static int git_tar_config(const char *var, const char *value)
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{
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if (!strcmp(var, "tar.umask")) {
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if (!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);
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}
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static int write_tar_entry(const unsigned char *sha1,
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const char *base, int baselen,
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const char *filename, unsigned mode, int stage)
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{
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static struct strbuf path = STRBUF_INIT;
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void *buffer;
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enum object_type type;
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unsigned long size;
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strbuf_reset(&path);
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strbuf_grow(&path, PATH_MAX);
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strbuf_add(&path, base, baselen);
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strbuf_addstr(&path, filename);
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if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
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strbuf_addch(&path, '/');
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buffer = NULL;
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size = 0;
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} else {
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buffer = sha1_file_to_archive(path.buf, sha1, mode, &type,
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&size, commit);
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if (!buffer)
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die("cannot read %s", sha1_to_hex(sha1));
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}
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write_entry(sha1, &path, mode, buffer, size);
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free(buffer);
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return READ_TREE_RECURSIVE;
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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 plen = args->base ? strlen(args->base) : 0;
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git_config(git_tar_config);
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archive_time = args->time;
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verbose = args->verbose;
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commit = args->commit;
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if (args->commit_sha1)
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write_global_extended_header(args->commit_sha1);
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if (args->base && plen > 0 && args->base[plen - 1] == '/') {
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char *base = xstrdup(args->base);
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int baselen = strlen(base);
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while (baselen > 0 && base[baselen - 1] == '/')
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base[--baselen] = '\0';
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write_tar_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
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free(base);
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}
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read_tree_recursive(args->tree, args->base, plen, 0,
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args->pathspec, write_tar_entry);
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write_trailer();
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return 0;
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}
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