How does debian/ubuntu knows a package has a updated version
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If my understanding is good, with apt update, Debian download a release file and with this file, it can tell if a package needs to be upgraded and with which dependencies. How does it do this? Th release file seems to be just a list of hashes so I don't quite understand.
Sorry, I don't have a very good English.
ubuntu debian apt
asked Apr 16 at 22:52
thomasthomas
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If my understanding is good, with apt update, Debian download a release file and with this file, it can tell if a package needs to be upgraded and with which dependencies. How does it do this? Th release file seems to be just a list of hashes so I don't quite understand.
Sorry, I don't have a very good English.
ubuntu debian apt
asked Apr 16 at 22:52
thomasthomas
433
New contributor
thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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If my understanding is good, with apt update, Debian download a release file and with this file, it can tell if a package needs to be upgraded and with which dependencies. How does it do this? Th release file seems to be just a list of hashes so I don't quite understand.
Sorry, I don't have a very good English.
ubuntu debian apt
asked Apr 16 at 22:52
thomasthomas
433
New contributor
thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
If my understanding is good, with apt update, Debian download a release file and with this file, it can tell if a package needs to be upgraded and with which dependencies. How does it do this? Th release file seems to be just a list of hashes so I don't quite understand.
Sorry, I don't have a very good English.
ubuntu debian apt
ubuntu debian apt
asked Apr 16 at 22:52
thomasthomas
433
New contributor
thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 16 at 22:52
thomasthomas
433
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thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked Apr 16 at 22:52
thomasthomas
433
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asked Apr 16 at 22:52
thomasthomas
433
asked Apr 16 at 22:52
thomasthomas
433
433
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thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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2 Answers
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Whilst apt update can download one or more Release files, the primary files it is downloading are Packages file(s). Those files contain the full list of available packages, their versions, and other metadata (like dependencies). Once apt has a list of available packages and their versions, it is a straightforward matter of comparison to determine which packages have versions newer than those currently installed.
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
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Package lists are the Packages and Sources files. These contain the debian/control file content for every package in the repository. From these metadata APT can determine a dependency solution.
Releases is a description of the entire archive and signature data.
Debian reference manual, Chapter 2. Debian package management
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
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2 Answers
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2 Answers
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Whilst apt update can download one or more Release files, the primary files it is downloading are Packages file(s). Those files contain the full list of available packages, their versions, and other metadata (like dependencies). Once apt has a list of available packages and their versions, it is a straightforward matter of comparison to determine which packages have versions newer than those currently installed.
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
add a comment |
Whilst apt update can download one or more Release files, the primary files it is downloading are Packages file(s). Those files contain the full list of available packages, their versions, and other metadata (like dependencies). Once apt has a list of available packages and their versions, it is a straightforward matter of comparison to determine which packages have versions newer than those currently installed.
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
add a comment |
Whilst apt update can download one or more Release files, the primary files it is downloading are Packages file(s). Those files contain the full list of available packages, their versions, and other metadata (like dependencies). Once apt has a list of available packages and their versions, it is a straightforward matter of comparison to determine which packages have versions newer than those currently installed.
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
Whilst apt update can download one or more Release files, the primary files it is downloading are Packages file(s). Those files contain the full list of available packages, their versions, and other metadata (like dependencies). Once apt has a list of available packages and their versions, it is a straightforward matter of comparison to determine which packages have versions newer than those currently installed.
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
answered Apr 16 at 23:24
womble♦womble
85.9k18146205
85.9k18146205
add a comment |
add a comment |
Package lists are the Packages and Sources files. These contain the debian/control file content for every package in the repository. From these metadata APT can determine a dependency solution.
Releases is a description of the entire archive and signature data.
Debian reference manual, Chapter 2. Debian package management
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
add a comment |
Package lists are the Packages and Sources files. These contain the debian/control file content for every package in the repository. From these metadata APT can determine a dependency solution.
Releases is a description of the entire archive and signature data.
Debian reference manual, Chapter 2. Debian package management
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
add a comment |
Package lists are the Packages and Sources files. These contain the debian/control file content for every package in the repository. From these metadata APT can determine a dependency solution.
Releases is a description of the entire archive and signature data.
Debian reference manual, Chapter 2. Debian package management
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
Package lists are the Packages and Sources files. These contain the debian/control file content for every package in the repository. From these metadata APT can determine a dependency solution.
Releases is a description of the entire archive and signature data.
Debian reference manual, Chapter 2. Debian package management
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
answered Apr 16 at 23:24
John MahowaldJohn Mahowald
9,0211713
9,0211713
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add a comment |
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