Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
Package: wnpp Severity: wishlist Owner: Eun e...@su.am * Package name: esu Version : 1.01 Upstream Author : Eun e...@su.am * URL : https://github.com/Eun/ecp * License : GPLv3 Programming Lang: C Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130820133306.14692.36296.report...@sd-27422.dedibox.fr
Re: Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
On Tue, Aug 20, 2013 at 03:33:06PM +0200, root wrote: * Package name: esu Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. How is this different from rsync? Quoting rsync(1): Rsync is a fast and extraordinarily versatile file copying tool. It can copy locally, to/from another host over any remote shell, or to/from a remote rsync daemon. [...] -c, --checksum skip based on checksum, not mod-time size Best wishes, Ryan -- |_)|_/ Ryan Kavanagh | Debian Developer | \| \ http://ryanak.ca/ | GPG Key 4A11C97A signature.asc Description: Digital signature
Re: Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
The difference is that ecp generates the checksum on the fly, this means it is faster then rsync, rsync copy's first and compares the sum of the source and destination afterwards (4 operations). esu saves one operation by calculating the checksum during reading the file. to make it clearer: rsync: 1. read srcfile 2. write dstfile 3. checksum of src 4. checksum of dst ecp: 1. read srcfile, checksum of src 2. write dstfile 3. checksum of dst 2013/8/20 Ryan Kavanagh r...@debian.org On Tue, Aug 20, 2013 at 03:33:06PM +0200, root wrote: * Package name: esu Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. How is this different from rsync? Quoting rsync(1): Rsync is a fast and extraordinarily versatile file copying tool. It can copy locally, to/from another host over any remote shell, or to/from a remote rsync daemon. [...] -c, --checksum skip based on checksum, not mod-time size Best wishes, Ryan -- |_)|_/ Ryan Kavanagh | Debian Developer | \| \ http://ryanak.ca/ | GPG Key 4A11C97A
Re: Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
On Tue, 20 Aug 2013 10:21:05 -0400 Ryan Kavanagh r...@debian.org wrote: On Tue, Aug 20, 2013 at 03:33:06PM +0200, root wrote: * Package name: esu Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. How is this different from rsync? Quoting rsync(1): Rsync is a fast and extraordinarily versatile file copying tool. It can copy locally, to/from another host over any remote shell, or to/from a remote rsync daemon. [...] -c, --checksum skip based on checksum, not mod-time size It means do not copy a file if its checksum on the receiver is the same as on the sender, that is, this option just modifies the way `rsync` detects whether a particular file should be updated on the receiver. The proposed tool combines (unconditional) copying with calculating a checksum over the copied content. At least that's how I read it. -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130820184122.7d07669ce7812ad02d814...@domain007.com
Re: Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
On Tue, Aug 20, 2013 at 06:41:22PM +0400, Konstantin Khomoutov wrote: On Tue, 20 Aug 2013 10:21:05 -0400 Ryan Kavanagh r...@debian.org wrote: On Tue, Aug 20, 2013 at 03:33:06PM +0200, root wrote: * Package name: esu Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. How is this different from rsync? Quoting rsync(1): ... [discussion of meaning of rsync option] It would be helpful if the upstream README.md and the package description explain what the checksums are for. Is this a replacement for cp+sha1sum (or sha256sum or whatever algorithm is used), or is the checksum used for verifying that the resulting file is copied correctly and has not become corrupted during the copy? If the latter, does the program do anything else to ensure a safe copy, such as fsync to make sure the target file is committed to disk, or flushing kernel buffer caches so that checksumming the target file happens on data that is read from the target disk, and not from cache memory? Also an explanation of why this is useful and why (and when) the kernel's usual mechanisms aren't enough would be a good idea. cp, but with checksums isn't a useful description of a program. Unless the program's output includes the checksums (perhaps for later verification), the checksums don't seem interesting to me as a user. They seem like an implementation detail rather than an essential feature of the program. -- http://www.cafepress.com/trunktees -- geeky funny T-shirts http://gtdfh.branchable.com/ -- GTD for hackers -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130820150940.gg4...@mavolio.codethink.co.uk
Re: Bug#720327: ITP: esu -- It allows to copy files with different checksums on the fly.
Package name should be ecp, sorry misspelled that. I fixed the README and improved some things. Thanks for your feedback! 2013/8/20 Lars Wirzenius l...@liw.fi On Tue, Aug 20, 2013 at 06:41:22PM +0400, Konstantin Khomoutov wrote: On Tue, 20 Aug 2013 10:21:05 -0400 Ryan Kavanagh r...@debian.org wrote: On Tue, Aug 20, 2013 at 03:33:06PM +0200, root wrote: * Package name: esu Description : It allows to copy files with different checksums on the fly. Basicly a replacement for cp with additional checksum on the fly support. It allows MD5, SHA1, SHA224, SHA265, SHA384, SHA512 algorithm to be used. How is this different from rsync? Quoting rsync(1): ... [discussion of meaning of rsync option] It would be helpful if the upstream README.md and the package description explain what the checksums are for. Is this a replacement for cp+sha1sum (or sha256sum or whatever algorithm is used), or is the checksum used for verifying that the resulting file is copied correctly and has not become corrupted during the copy? If the latter, does the program do anything else to ensure a safe copy, such as fsync to make sure the target file is committed to disk, or flushing kernel buffer caches so that checksumming the target file happens on data that is read from the target disk, and not from cache memory? Also an explanation of why this is useful and why (and when) the kernel's usual mechanisms aren't enough would be a good idea. cp, but with checksums isn't a useful description of a program. Unless the program's output includes the checksums (perhaps for later verification), the checksums don't seem interesting to me as a user. They seem like an implementation detail rather than an essential feature of the program. -- http://www.cafepress.com/trunktees -- geeky funny T-shirts http://gtdfh.branchable.com/ -- GTD for hackers
