upstream/mercurial-mirror Files · tests/test-largefiles-small-disk.t

largefiles: write .hg/largefiles/ files atomically...

largefiles: write .hg/largefiles/ files atomically Before, it was possible to create a .hg/largefiles/hash file with truncated content, i.e., content where SHA-1(content) != hash This breaks the fundamental invariant in largefiles that the file content for files in .hg/largefiles hash to the filename.

Martin Geisler - - Load All Authors

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             test-largefiles-small-disk.t
        
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      Test how largefiles abort in case the disk runs full

        $ cat > criple.py <<EOF

        > import os, errno, shutil

        > from mercurial import util

        > #

        > # this makes the original largefiles code abort:

        > def copyfileobj(fsrc, fdst, length=16*1024):

        >     fdst.write(fsrc.read(4))

        >     raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))

        > shutil.copyfileobj = copyfileobj

        > #

        > # this makes the rewritten code abort:

        > def filechunkiter(f, size=65536, limit=None):

        >     yield f.read(4)

        >     raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))

        > util.filechunkiter = filechunkiter

        > EOF

        $ echo "[extensions]" >> $HGRCPATH

        $ echo "largefiles =" >> $HGRCPATH

        $ hg init alice

        $ cd alice

        $ echo "this is a very big file" > big

        $ hg add --large big

        $ hg commit --config extensions.criple=$TESTTMP/criple.py -m big

        abort: No space left on device

        [255]

      The largefile is not created in .hg/largefiles:

        $ ls .hg/largefiles

        dirstate

      The user cache is not even created:

        >>> import os; os.path.exists("$HOME/.cache/largefiles/")

        False

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				Test how largefiles abort in case the disk runs full

				$ cat > criple.py <<EOF
				> import os, errno, shutil
				> from mercurial import util
				> #
				> # this makes the original largefiles code abort:
				> def copyfileobj(fsrc, fdst, length=16*1024):
				> fdst.write(fsrc.read(4))
				> raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
				> shutil.copyfileobj = copyfileobj
				> #
				> # this makes the rewritten code abort:
				> def filechunkiter(f, size=65536, limit=None):
				> yield f.read(4)
				> raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
				> util.filechunkiter = filechunkiter
				> EOF

				$ echo "[extensions]" >> $HGRCPATH
				$ echo "largefiles =" >> $HGRCPATH

				$ hg init alice
				$ cd alice
				$ echo "this is a very big file" > big
				$ hg add --large big
				$ hg commit --config extensions.criple=$TESTTMP/criple.py -m big
				abort: No space left on device
				[255]

				The largefile is not created in .hg/largefiles:

				$ ls .hg/largefiles
				dirstate

				The user cache is not even created:

				>>> import os; os.path.exists("$HOME/.cache/largefiles/")
				False