From 2c71810b90d122abdcc57fc3cb62174d16e77b58 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Wed, 9 Aug 2006 22:47:25 -0700 Subject: [PATCH] git-apply: applying a patch to make a symlink shorter. The internal representation of the result is counted string (i.e. char *buf and ulong size), which is fine for writing out to regular file, but throwing the buf at symlink(2) was a no-no. Reported by Willy Tarreau. Signed-off-by: Junio C Hamano --- builtin-apply.c | 11 +++++++++ t/t4115-apply-symlink.sh | 49 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) create mode 100755 t/t4115-apply-symlink.sh diff --git a/builtin-apply.c b/builtin-apply.c index f8c6763c7..c15987386 100644 --- a/builtin-apply.c +++ b/builtin-apply.c @@ -1698,6 +1698,14 @@ static int apply_data(struct patch *patch, struct stat *st, struct cache_entry * desc.buffer = buf; if (apply_fragments(&desc, patch) < 0) return -1; + + /* NUL terminate the result */ + if (desc.alloc <= desc.size) { + desc.buffer = xrealloc(desc.buffer, desc.size + 1); + desc.alloc++; + } + desc.buffer[desc.size] = 0; + patch->result = desc.buffer; patch->resultsize = desc.size; @@ -2040,6 +2048,9 @@ static int try_create_file(const char *path, unsigned int mode, const char *buf, int fd; if (S_ISLNK(mode)) + /* Although buf:size is counted string, it also is NUL + * terminated. + */ return symlink(buf, path); fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666); if (fd < 0) diff --git a/t/t4115-apply-symlink.sh b/t/t4115-apply-symlink.sh new file mode 100755 index 000000000..d5f2cfb18 --- /dev/null +++ b/t/t4115-apply-symlink.sh @@ -0,0 +1,49 @@ +#!/bin/sh +# +# Copyright (c) 2005 Junio C Hamano +# + +test_description='git-apply symlinks and partial files + +' + +. ./test-lib.sh + +test_expect_success setup ' + + ln -s path1/path2/path3/path4/path5 link1 && + git add link? && + git commit -m initial && + + git branch side && + + rm -f link? && + + ln -s htap6 link1 && + git update-index link? && + git commit -m second && + + git diff-tree -p HEAD^ HEAD >patch && + git apply --stat --summary patch + +' + +test_expect_success 'apply symlink patch' ' + + git checkout side && + git apply patch && + git diff-files -p >patched && + diff -u patch patched + +' + +test_expect_success 'apply --index symlink patch' ' + + git checkout -f side && + git apply --index patch && + git diff-index --cached -p HEAD >patched && + diff -u patch patched + +' + +test_done -- 2.30.2