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authorAdam Spiers <git@adamspiers.org>2013-04-11 13:05:13 +0100
committerJunio C Hamano <gitster@pobox.com>2013-04-11 11:11:36 -0700
commitf1ed7fea7974218db15155f3b8d2e29d3fe0971c (patch)
tree6e84f63ddd4fb3a927d2ef2cc2829c0d566ac7b8 /Documentation/git-check-ignore.txt
parent0c8e8c080b08632d6dbee33d093b5df648196b49 (diff)
downloadgit-f1ed7fea7974218db15155f3b8d2e29d3fe0971c.tar.gz
git-f1ed7fea7974218db15155f3b8d2e29d3fe0971c.tar.xz
Documentation: add caveats about I/O buffering for check-{attr,ignore}
check-attr and check-ignore have the potential to deadlock callers which do not read back the output in real-time. For example, if a caller writes N paths out and then reads N lines back in, it risks becoming blocked on write() to check-*, and check-* is blocked on write back to the caller. Somebody has to buffer; the pipe buffers provide some leeway, but they are limited. Thanks to Peff for pointing this out: http://article.gmane.org/gmane.comp.version-control.git/220534 Signed-off-by: Adam Spiers <git@adamspiers.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/git-check-ignore.txt')
-rw-r--r--Documentation/git-check-ignore.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/git-check-ignore.txt b/Documentation/git-check-ignore.txt
index 7e3cabc9d..8e1f7ab7e 100644
--- a/Documentation/git-check-ignore.txt
+++ b/Documentation/git-check-ignore.txt
@@ -81,6 +81,11 @@ not. (Without this option, it would be impossible to tell whether the
absence of output for a given file meant that it didn't match any
pattern, or that the output hadn't been generated yet.)
+Buffering happens as documented under the `GIT_FLUSH` option in
+linkgit:git[1]. The caller is responsible for avoiding deadlocks
+caused by overfilling an input buffer or reading from an empty output
+buffer.
+
EXIT STATUS
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