b79541af7a
The filter system allows for alterations to file contents when they're
added to the database or working tree. ("Smudge" when moving to the
working tree; "clean" when moving to the database.) This is used
natively to handle CRLF to LF conversions. It's also employed by Git-LFS
to replace large files from the working tree with small tracking files
in the repo and vice versa.
Git reads the entire smudged file into memory to convert it into a
"clean" form to be used in-core. While this is inefficient, there's a
more insidious problem on some platforms due to inconsistency between
using unsigned long and size_t for the same type of data (size of a file
in bytes). On most 64-bit platforms, unsigned long is 64 bits, and
size_t is typedef'd to unsigned long. On Windows, however, unsigned long
is only 32 bits (and therefore on 64-bit Windows, size_t is typedef'd to
unsigned long long in order to be 64 bits).
Practically speaking, this means 64-bit Windows users of Git-LFS can't
handle files larger than 2^32 bytes. Other 64-bit platforms don't suffer
this limitation.
This commit introduces a test exposing the issue; future commits make it
pass. The test simulates the way Git-LFS works by having a tiny file
checked into the repository and expanding it to a huge file on checkout.
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Matt Cooper <vtbassmatt@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
102 lines
2.5 KiB
Bash
Executable File
102 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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test_description='test conversion filters on large files'
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. ./test-lib.sh
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set_attr() {
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test_when_finished 'rm -f .gitattributes' &&
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echo "* $*" >.gitattributes
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}
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check_input() {
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git read-tree --empty &&
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git add small large &&
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git cat-file blob :small >small.index &&
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git cat-file blob :large | head -n 1 >large.index &&
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test_cmp small.index large.index
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}
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check_output() {
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rm -f small large &&
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git checkout small large &&
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head -n 1 large >large.head &&
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test_cmp small large.head
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}
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test_expect_success 'setup input tests' '
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printf "\$Id: foo\$\\r\\n" >small &&
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cat small small >large &&
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git config core.bigfilethreshold 20 &&
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git config filter.test.clean "sed s/.*/CLEAN/"
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'
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test_expect_success 'autocrlf=true converts on input' '
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test_config core.autocrlf true &&
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check_input
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'
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test_expect_success 'eol=crlf converts on input' '
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set_attr eol=crlf &&
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check_input
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'
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test_expect_success 'ident converts on input' '
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set_attr ident &&
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check_input
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'
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test_expect_success 'user-defined filters convert on input' '
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set_attr filter=test &&
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check_input
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'
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test_expect_success 'setup output tests' '
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echo "\$Id\$" >small &&
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cat small small >large &&
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git add small large &&
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git config core.bigfilethreshold 7 &&
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git config filter.test.smudge "sed s/.*/SMUDGE/"
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'
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test_expect_success 'autocrlf=true converts on output' '
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test_config core.autocrlf true &&
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check_output
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'
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test_expect_success 'eol=crlf converts on output' '
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set_attr eol=crlf &&
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check_output
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'
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test_expect_success 'user-defined filters convert on output' '
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set_attr filter=test &&
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check_output
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'
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test_expect_success 'ident converts on output' '
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set_attr ident &&
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rm -f small large &&
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git checkout small large &&
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sed -n "s/Id: .*/Id: SHA/p" <small >small.clean &&
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head -n 1 large >large.head &&
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sed -n "s/Id: .*/Id: SHA/p" <large.head >large.clean &&
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test_cmp small.clean large.clean
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'
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# This smudge filter prepends 5GB of zeros to the file it checks out. This
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# ensures that smudging doesn't mangle large files on 64-bit Windows.
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test_expect_failure EXPENSIVE,SIZE_T_IS_64BIT,!LONG_IS_64BIT \
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'files over 4GB convert on output' '
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test_commit test small "a small file" &&
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small_size=$(test_file_size small) &&
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test_config filter.makelarge.smudge \
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"test-tool genzeros $((5*1024*1024*1024)) && cat" &&
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echo "small filter=makelarge" >.gitattributes &&
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rm small &&
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git checkout -- small &&
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size=$(test_file_size small) &&
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test "$size" -eq $((5 * 1024 * 1024 * 1024 + $small_size))
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'
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test_done
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