From 4c691724f175573a2dc4118782744cb0e852ab41 Mon Sep 17 00:00:00 2001 From: Rene Scharfe Date: Sat, 25 Mar 2006 23:21:07 +0100 Subject: [PATCH] tar-tree: Use the prefix field of a tar header ... to store parts of the path, if possible. This allows us to avoid writing extended headers in certain cases (long pathes can only be split at '/' chars). Also adds a file to the test repo with a 100 chars long directory name. Even old versions of tar that don't understand POSIX extended headers should be able to handle this testcase. Btw.: The longest path in the kernel tree currently has 70 chars. Together with a 30 chars long prefix this would already cross the field limit of 100 chars. Signed-off-by: Rene Scharfe Signed-off-by: Junio C Hamano --- t/t5000-tar-tree.sh | 3 +++ tar-tree.c | 24 +++++++++++++++++++++--- 2 files changed, 24 insertions(+), 3 deletions(-) diff --git a/t/t5000-tar-tree.sh b/t/t5000-tar-tree.sh index adc5e937d..278eb6670 100755 --- a/t/t5000-tar-tree.sh +++ b/t/t5000-tar-tree.sh @@ -34,6 +34,9 @@ test_expect_success \ mkdir a/bin && cp /bin/sh a/bin && ln -s a a/l1 && + (p=long_path_to_a_file && cd a && + for depth in 1 2 3 4 5; do mkdir $p && cd $p; done && + echo text >file_with_long_path) && (cd a && find .) | sort >a.lst' test_expect_success \ diff --git a/tar-tree.c b/tar-tree.c index 11bbc81e3..efab2b542 100644 --- a/tar-tree.c +++ b/tar-tree.c @@ -161,6 +161,16 @@ static unsigned int ustar_header_chksum(const struct ustar_header *header) return chksum; } +static int get_path_prefix(const struct strbuf *path, int maxlen) +{ + int i = path->len; + if (i > maxlen) + i = maxlen; + while (i > 0 && path->buf[i] != '/') + i--; + return i; +} + static void write_entry(const unsigned char *sha1, struct strbuf *path, unsigned int mode, void *buffer, unsigned long size) { @@ -195,9 +205,17 @@ static void write_entry(const unsigned char *sha1, struct strbuf *path, return; } if (path->len > sizeof(header.name)) { - sprintf(header.name, "%s.data", sha1_to_hex(sha1)); - strbuf_append_ext_header(&ext_header, "path", - path->buf, path->len); + 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); } -- 2.30.2