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Top Forums Shell Programming and Scripting How to check if downloading of a file is completed? Post 302989107 by looney on Sunday 8th of January 2017 04:30:53 AM
Old 01-08-2017
Quote:
Originally Posted by Don Cragun
Let us propose that your 3rd party send you a zip file named file.zip (as they are doing now) and after they have sent you file.zip they then send you a file named file.checksum containing the checksum for file.zip. I am suggesting that instead of trying to figure out when file.zip is complete by trying to determine when it has stopped growing, you instead just watch for non-zero length files with names ending in .checksum. For each non-zero length file.checksum you find you will know that you have a complete corresponding file.zip and you can verify that it was received correctly by comparing the contents of file.checksum to the checksum of the file file.zip.
Thanks Mr Don, this seems very valid approach to wait for completion of transfer of main file by watching it's checksum file that will arrive at end. But just for a knowledge how third party will handle this. Presently they are manually uploading file to our end, So they can also send the checksum file for now but how this can be automated. How code can recognise if the uploading is completed and checksum file can be transferred.
Thanks.
 

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ZIP_ADD(3)						     Library Functions Manual							ZIP_ADD(3)

NAME
zip_add , - .Nm zip_replace add file to zip archive or replace file in zip archive LIBRARY
libzip (-lzip) SYNOPSIS
#include <zip.h> zip_int64_t zip_add(struct zip *archive, const char *name); "struct zip_source *source" int zip_replace(struct zip *archive, zip_uint64_t index); "struct zip_source *source" DESCRIPTION
The function zip_add adds a file to a zip archive, while zip_replace replaces an existing file in a zip archive. The argument archive specifies the zip archive to which the file should be added. name is the file's name in the zip archive (for zip_add ), while index speci- fies which file should be replaced (for zip_replace ). The data is obtained from the source argument. See the zip_source_* functions cited in SEE ALSO. RETURN VALUES
Upon successful completion, zip_add returns the index of the new file in the archive, and zip_replace returns 0. Otherwise, -1 is returned and the error code in archive is set to indicate the error. EXAMPLES
struct zip_source *s; if ((s=zip_source_buffer(archive, buffer, len)) == NULL || zip_add(archive, name, s) 0) { zip_source_free(s); printf("error adding file: %s0, zip_strerror(archive)); } ERRORS
zip_add and zip_replace fail if: [ZIP_ER_EXISTS] There is already a file called name in the archive. (Only applies to zip_add ). [ZIP_ER_INVAL] source or name are NULL, or index is invalid. [ZIP_ER_MEMORY] Required memory could not be allocated. SEE ALSO
libzip(3), zip_source_file(3), zip_source_filep(3), zip_source_function(3), zip_source_zip(3) AUTHORS
Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at> NiH March 10, 2009 ZIP_ADD(3)
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