tool_operate: don't truncate the etag save file by default #13432
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This fixes a regression of 75d79a4. The code in tool-operate truncated the etag save file, under the assumption that the file would be written with a new etag value. However since 75d79a4 that might not be the case anymore and could result in the file being truncated when --etag-compare and --etag-save was used and that the etag value matched with what the server responded. Instead the truncation should not be done when a new etag value should be written. Test 3204 was added to verify that the file with the etag value doesn't change the contents when used by --etag-compare and --etage-save and that value matches with what the server returns on a non 2xx response.
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bagder
approved these changes
Apr 23, 2024
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This fixes a regression of 75d79a4. The code in tool-operate truncated the etag save file, under the assumption that the file would be written with a new etag value. However since 75d79a4 that might not be the case anymore and could result in the file being truncated when --etag-compare and --etag-save was used and that the etag value matched with what the server responded. Instead the truncation should not be done when a new etag value should be written.
Test 3204 was added to verify that the file with the etag value doesn't change the contents when used by --etag-compare and --etage-save and that value matches with what the server returns on a non 2xx response.
A simple reproducer of this bug is using the command as advertised in the blog post:
Run it three times and notice that for the second time it indeed doesn't download anything but for the third time it does, because on the second time the
etag.txtis being truncated and nothing is being written back.