_______________________ CARBS PACKAGING TOOLS User Manual Cem Keylan _______________________ Table of Contents _________________ 1. Copying 2. Preface 3. Usage 4. Configuration .. 1. CPT Base .. 2. Environment Variables ..... 1. `CPT_PATH' ..... 2. `CPT_COMPRESS' ..... 3. `CPT_FORCE' ..... 4. `CPT_PID' .. 3. Hooks .. 4. Editing the build file during pre-build 5. Packaging System .. 1. build .. 2. sources .. 3. checksums .. 4. version .. 5. depends .. 6. meta .. 7. post-install .. 8. message .. 9. test 6. Rsync Repositories .. 1. Setting up an Rsync repository 7. Comparison Between CPT and KISS 8. CPT Library .. 1. Calling the library .. 2. Option parsing ..... 1. Defining a parser ..... 2. `global_options()' .. 3. Message functions ..... 1. `out()' ..... 2. `log()' ..... 3. `die()' ..... 4. `warn()' ..... 5. `prompt()' .. 4. Text functions ..... 1. `contains()' ..... 2. `regesc()' ..... 3. `pop()' ..... 4. `sepchar()' .. 5. Portability functions ..... 1. `_seq()' ..... 2. `_stat()' ..... 3. `_readlinkf()' .. 6. System Functions ..... 1. `as_root()' .. 7. Package Functions ..... 1. `pkg_build()' ..... 2. `pkg_depends()' ..... 3. `pkg_order()' ..... 4. `pkg_owner()' ..... 5. `pkg_isbuilt()' ..... 6. `pkg_lint()' ..... 7. `pkg_find()' ..... 8. `pkg_get_base()' ..... 9. `pkg_gentree()' ..... 10. `pkg_query_meta()' This is a reference document containing both the user-guide and the development manual for *Carbs Packaging Tools*. For development logs see [the git repository]. [the git repository] 1 Copying ========= Copyright (c) 2020-2021 Cem Keylan Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License." 2 Preface ========= Carbs Linux uses its own package management toolchain named `cpt' which was initially forked from the [kiss] package manager. Unlike `kiss', however, its main goal is being easily extendable. Instead of being a single file package manager, it revolves around the shell library `cpt-lib', and many tools that wrap around it. This document aims to document both the usage of the distributed tools and document the library functions. [kiss] 3 Usage ======= `cpt' is formed of many tools combined in a single environment, similar to `git'. When you run `cpt' without any arguments, it will show all available tools and their explanations. Here is an example call with extra scripts on my system: ,---- | -> Carbs Packaging Tool | -> add Commit the current directory as a new package | -> alternatives List and swap to alternatives | -> build Build a package | -> bump Commit the current directory as a version bump | -> cargo-urlgen Create static cargo sources for Rust packages | -> cargolock-urlgen Convert the given Cargo.lock file to sources | -> cat Concatanate package files in the installed package database | -> changelog Print the git log of the specific package | -> chbuild Create/destroy temporary chroots | -> checkmissing Verify package manifests | -> checksum Generate checksums | -> chroot Enter a chroot | -> commit Commit a package without the prefix of 'package:' | -> depends Display a package's dependencies | -> download Download sources for the given package | -> exec Execute a command inside the alternatives system | -> export Turn an installed package into a CPT tarball | -> fork Fork a package to the current directory | -> getchoice Prints the full path to a file in the alternatives system. | -> install Install a package | -> link Link a forked package's files to the other repository | -> list List installed packages | -> maintainer Find the maintainer of a package | -> manifest Display all files owned by a package | -> manifest-tree Display all files owned by a package with a tree view | -> new Create a boilerplate CPT package | -> orphans List orphaned packages | -> owns Check which package owns a file | -> rel Bump the release number of a package | -> remove Remove a package | -> repodepends Display a package's dependencies in the repository | -> reporevdepends Display packages on the repository which depend on package | -> reset Remove all packages except for the base | -> revdepends Display packages which depend on package | -> search Search for a package | -> size Show the size on disk for a package | -> source Extract sources of a given package to the current directory | -> update Check for updates `---- The documentation of `cpt' aims to keep tool flags and related usage information on concise manual pages, while moving the rest of the information to this User Manual to avoid unwarranted duplication. To learn more on a specific usage of a tool, use the `man' program: ,---- | man cpt-build `---- 4 Configuration =============== The package manager does *NOT* have a configuration file, but there are a variety of ways in order to interact with and configure the package manager. 4.1 CPT Base ~~~~~~~~~~~~ An `/etc/cpt-base' file can be used in order to define the base to the package manager. Base packages are the packages that receive special treatment by utilities such as `cpt-reset', and `cpt-orphans'. ,---- | # This file defines the base packages of the system. You can add or remove | # package names in order to redefine the base. This file will be used by | # cpt-orphans and cpt-reset. If this file doesn't exist on /etc/cpt-base, both | # of the tools will assume that there is no defined base, so use with caution. | baselayout | binutils | byacc | busybox | bzip2 | ca-certificates | curl | flex | gcc | git | rsync | gzip | cpt | bearssl | linux-headers | m4 | make | musl | pkgconf | xz | zlib `---- 4.2 Environment Variables ~~~~~~~~~~~~~~~~~~~~~~~~~ Since there is no configuration file for `cpt', the package manager is configured through environment variables. These can be set per operation, or be set to your shell configuration or `~/.profile'. Here are the environment variables that alter the behaviour of `cpt', some of them have separate sections to provide detailed information. `CPT_PATH' Set the locations of your repositories. It is similar to the `PATH' variable. `CPT_CACHE' The cache directory for `cpt'. Default: `$XDG_CACHE_HOME/cpt'. `CPT_CHOICE' If this is set to 0, a package installation will be aborted on conflicts. `CPT_COLOR' If this is set to 1, `cpt' tools will be forced to display coloured output. If set to 0, they will be forced to display them without colours. Otherwise, `cpt' will output colour as long as it is outputting to a terminal. `CPT_DEBUG' If set to 1, temporary directories will not be removed after the operation. `CPT_FETCH' If set to 0, `cpt-update' will not fetch repositories. `CPT_FORCE' If set to 1, `cpt' tools will force operation. `CPT_HOOK' Absolute path to the package manager hook file. `CPT_KEEPLOG' If set to 1, `cpt' will keep logs regardless of operation success. `CPT_PID' Set the temporary build directory name. `CPT_PROMPT' If set to 0, `cpt' will not prompt you for anything. `CPT_ROOT' If this variable is set, `cpt' will assume the given path as the system root. `CPT_TEST' If set to 1, `cpt-build' will run tests whenever available. `CPT_TMPDIR' The directory to create the temporary directories. 4.2.1 `CPT_PATH' ---------------- Similar to the `PATH' variable, `cpt' find repositories from the `CPT_PATH' variable. Here is an example: ,---- | CPT_PATH=$HOME/repos/repo1:$HOME/repos/repo2:$HOME/repos/repo3 `---- This is a simplistic and a structured example for repository locations, but it doesn't necessarily need to be as tidy as the example above. Here is an example for something a little more complex. ,---- | CPT_PATH=$HOME/repos/overrides:/var/db/cpt/repo/core:/var/db/cpt/repo/extra:$HOME/repos/personal `---- This example brings us to the next section of this document. * 4.2.1.1 Repository preferences When you are using multiple repositories from multiple vendors, you will find out that some repositories have the same packages. `cpt' doesn't care about conflicting packages. If you want to build a package that exists on multiple repositories, `cpt' will build the first matching package. This means that if `grep' package (for the sake of an example) exists on both `$HOME/repos/personal' and `$HOME/repos/carbs/extra', and you want to install from your personal repository, you must set `CPT_PATH' so that your personal repository is listed before the `extra' repository. ,---- | CPT_PATH=$HOME/repos/personal:$HOME/repos/carbs/extra `---- * 4.2.1.2 Setting the `CPT_PATH' You can set the `CPT_PATH' variable on your shell configuration or your `.profile' file in a way that is easy to read. The below example sets `CPT_PATH' in a way that is easy to understand which repository comes first: ,---- | CPT_PATH=$HOME/repos/overrides | CPT_PATH=$CPT_PATH:$HOME/repos/carbs/core | CPT_PATH=$CPT_PATH:$HOME/repos/carbs/extra | CPT_PATH=$CPT_PATH:$HOME/repos/carbs/xorg | CPT_PATH=$CPT_PATH:$HOME/repos/personal | export CPT_PATH `---- 4.2.2 `CPT_COMPRESS' -------------------- When setting the `CPT_COMPRESS' value, you should set the name of the default suffixes for the program. Available values are: - `gz' - `zst' - `bz2' - `xz' - `lz' Defaults to `gz'. 4.2.3 `CPT_FORCE' ----------------- If this is set to 1, some of the `cpt' tools will continue regardless of errors or skip certain checks. Here are some examples: - `cpt-install' will install a package without verifying its manifest. - `cpt-install' will install a package even when there are missing dependencies. - `cpt-remove' will remove packages even when there are other packages that depend on the current package. Defaults to 0. 4.2.4 `CPT_PID' --------------- If this variable is set, the temporary files will be created with this variable as the suffix, instead of the PID of the `cpt' process. The advantage is that you can know exactly where the build directory is located, while the disadvantage is that there will be issues with multiple operations at the same time. So the best way to use this variable is during one-time `cpt' calls. ,---- | CPT_PID=mesa cpt b mesa `---- By running the above, you will know that the created build directories will end with the `*-mesa' suffix. 4.3 Hooks ~~~~~~~~~ Hooks can be used in order to change the runtime behaviour of the package manager. There are a variety of package hooks, mostly self explanatory: pre-build Run just before the `build' script is run post-build Run after the `build' script is run successfully build-fail Run if the `build' script fails pre-test Run before the `test' script is run test-fail Run if the `test' script fails pre-install Run before a package is installed for each package post-install Run after a package is installed for each package pre-remove Run before a package is removed for each package post-remove Run after a package is removed for each package pre-fetch Run before all repositories are fetched post-fetch Run after all repositories are fetched post-package Run after a tarball for a package is created In order to use hooks, you will need to set the `CPT_HOOK' variable pointing to your hook file. Your hook file *MUST* be a POSIX shell script as its contents are sourced by the package manager. The hook is given 3 variables when it is executed. Those are: `$TYPE' The type of the hook, (`pre-build', `post-build', etc.) `$PKG' The package that `cpt' is currently working on. Can be null. `$DEST' The destination of the operation. Can be null. 4.4 Editing the build file during pre-build ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ You can edit the `build' file during pre-build. The file is copied from the repository to the build directory named as `.build.cpt'. You can use `sed' or any other tool to edit the build file. After the build is complete, a `diff' file will be placed to the package database named as `build.diff'. Here is an example `build' file manipulation during the pre-build hook. ,---- | cat < .build.cpt | #!/bin/sh -e | | for patch in bash50-0??; do | patch -p0 < "\$patch" | done | | export LDFLAGS=-static | | ./configure \ | --prefix=/usr \ | --without-bash-malloc \ | --disable-nls | | export MAKEFLAGS="TERMCAP_LIB=/usr/lib/libncursesw.a $MAKEFLAGS" | | make | make DESTDIR="\$1" install | | ln -s bash "\$1/usr/bin/sh" | EOF `---- 5 Packaging System ================== A package is formed of several files, from these files, only `build', `checksums', and `version' files are mandatory. This section talks about files that are interpreted specially by the package manager. Any other file can be added to the package directory at the discretion of the package maintainer. Everything in the package directory will also be added to the package database that is located on `/var/db/cpt/installed'. These can be patches, configuration files, etc. 5.1 build ~~~~~~~~~ Typically `build' files are shell scripts that run commands to prepare the source code to be installed on the target system. Even though we will be assuming that the `build' file is a POSIX shell script (for portability's sake), `build' files can be any executable program from binary programs to `perl' scripts. The contents of a build script do not need to follow a certain rule for the package manager, except for the fact that the user needs the permission to execute the file. An important advice is to append an '-e' to the shebang (#!/bin/sh -e) so that the build script exits on compilation error. Build is run with three arguments (`$#') - Location of the package directory (DESTDIR) - Package version - System architecture 5.2 sources ~~~~~~~~~~~ `sources' file is a list of files and sources that will be put to the build directory during the build process. Those can be remote sources (such as tarballs), git repositories, and files that reside on the package directory. The syntax is pretty simple for the `soures' file; `src dest'. The `dest' parameter is optional. It is the directory that the source will be placed in. Here is the `sources' file for the `gst-plugins' package: ,---- | https://gstreamer.freedesktop.org/src/gst-plugins-good/gst-plugins-good-1.16.2.tar.xz good | https://gstreamer.freedesktop.org/src/gst-plugins-bad/gst-plugins-bad-1.16.2.tar.xz bad | https://gstreamer.freedesktop.org/src/gst-plugins-ugly/gst-plugins-ugly-1.16.2.tar.xz ugly | https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.16.2.tar.xz libav `---- This file is read from the package manager as space seperated. Files that begin with a `#' comment are ignored. The first value points to the location of the source. If it starts with a protcol url, (such as ) it will be downloaded with `curl'. If the source is a git repository, it shall be prefixed with a `git+' git(1) will be used to do a shallow clone of the repository. If the commit is suffixed by a history pointer, git will checkout the relevant revision. So, `git+git://example.com/pub/repo@v1.2.3' will checkout the tag named "v1.2.3" `git+git://example.com/pub/repo#development' will checkout the branch named "development" `git+git://example.com/pub/repo#1a314s87' will checkout the commit named "1a314s87" Other files are assumed to be residing in the package directory. They should be added with their paths relative to the package directory. 5.3 checksums ~~~~~~~~~~~~~ `checksums' file is generated by the `cpt c pkg' command. It is generated according to the order of the sources file. That's why you shouldn't be editing it manually. The checksums file is created with the digests of the files using the sha256 algorithm. 5.4 version ~~~~~~~~~~~ The version file includes the version of the software and the release number of of the package on a space seperated format. The contents of the file should look like below. ,---- | 1.3.2 1 `---- 5.5 depends ~~~~~~~~~~~ This is a list of dependencies that must be installed before a package build. You can append "make" after a dependency to mark a package is only required during the build process of a package. Packages marked as a make dependency can be removed after the build. There are also "test" dependencies. These dependencies are only installed if either the `CPT_TEST' is set to 1, or the build is run with the `-t' or `--test' options. So, a package package could have the following `depends' file: ,---- | linux-headers make | python test | zlib `---- 5.6 meta ~~~~~~~~ `meta' is a non-mandatory package file that can be used to provide information otherwise non-relevant to the functions of the package manager. This file can later be queried with the [pkg_query_meta()] function. The file has a simple markup format, it must adhere to the `KEY: VAL' format. An example for the `cpt' package would be as follows: ,---- | description: Carbs Packaging Tools | license: MIT | maintainer: Linux User `---- [pkg_query_meta()] See section 8.7.10 5.7 post-install ~~~~~~~~~~~~~~~~ `post-install' files have the same requirements as the build script. They will be run after the package is installed as root (or as the user if the user has write permissions on `CPT_ROOT'). 5.8 message ~~~~~~~~~~~ This plaintext file will be outputted with `cat' after every package is installed. 5.9 test ~~~~~~~~ Test files are mainly for the repository maintainer to test the packages, and will only run if the user has the `CPT_TEST' variable set, or the build is run with the `-t' or `--test' options. This script is run on the build directory. It is run right after the build script is finished. 6 Rsync Repositories ==================== Rsync repositories are simple to serve and simple to use. In the repository directory, there needs to be a `.rsync' file that points to the remote of the repository. This is used in order to fetch changes from the upstream. `.rsync' file looks like this for the core repository: ,---- | rsync://carbslinux.org/repo/core `---- Rsync repositories have some few distinctions when it comes to fetching them. They can be either synced individually or as a "root". There are 2 important files, those are `.rsync' and `.rsync_root'. Here is the Carbs Linux rsync repository structure. ,---- | / | ----------------- | | | | .rsync core/ | ---------------- | | | | .rsync .rsync_root `---- Unlike git repositories, they don't have a defined "root" directory. This is both an advantage and a disadvantage. This way, we can sync individual repositories, but that also means we need extra files to define root directories and repository locations. Here is the content for each of these files: ,---- | /.rsync: rsync://carbslinux.org/repo | /core/.rsync: rsync://carbslinux.org/repo/core | /core/.rsync_root: .. `---- The `.rsync_root' file on the core repository points to the upper directory. If a `.rsync' file exists on the upper directory, this means that is the whole repository and will sync the entire repository instead of each individual repository. If the upper directory doesn't have this `.rsync' file, this means that this is an individual repository, and the package manager will fetch accordingly. 6.1 Setting up an Rsync repository ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Carbs Linux repositories automatically sync from the git repostitories and serve it through the rsync daemon. Here is a sample shell script that I use in order to sync repositories. Feel free to customize for your own use. ,---- | #!/bin/sh | HOSTNAME="rsync://carbslinux.org/repo" | GITDIR="/pub/git/repo" | SHAREDIR="/pub/share/repo" | git -C "$GITDIR" pull | | rsync -avcC --delete --include=core --exclude=.rsync,.rsync_root "$GITDIR/." "$SHAREDIR" | | printf '%s\n' "$HOSTNAME" > "$GITDIR/.rsync" | for dir in "$GITDIR/"*; do | [ -d "$dir" ] || continue | [ -f "$dir/.rsync" ] || | printf '%s/%s\n' "$HOSTNAME" "${dir##*/}" > "$dir/.rsync" | printf '..\n' > "$dir/.rsync_root" | done `---- You can then create an *rsync* user for serving the repositories. ,---- | $ adduser -SD rsync `---- Create `/etc/rsyncd.conf' and a service configuration as well. ,---- | uid = rsync | gid = rsync | address = example.com | max connections = 10 | use chroot = yes | | [repo] | path = /pub/share/repo | comment = My repository `---- Create a service file at `/etc/sv/rsync/run' (runit): ,---- | #!/bin/sh -e | exec rsync --daemon --no-detach `---- 7 Comparison Between CPT and KISS ================================= Lots of things have changed since `cpt' was forked from `kiss' in terms of functionalities and ideals. This section aims to describe the similarities and differences of both package managers as neutral as possible. Keep in mind that this is the `cpt' documentation, so it may be biased regardless. Package Manager While `kiss' aims to be a simple single file package manager, `cpt' aims to be an extendable package manager library. `kiss' has all of its features built-in, while `cpt' has all of its features separated into small tools. These tools can be called from the main `cpt' tool (in order to keep `kiss'-like usage) or with their names directly (e.g `cpt-build'). Configuration Neither `kiss' nor `cpt' use configuration files. Instead, they are configured through environment variables. Additionally, all `cpt' tools can receive flags that alter their functionality. `kiss' does not accept flags. Package Repositories In addition to git repositories, `cpt' also makes use of [rsync repositories]. Package Sources In addition to git repositories for sources, `cpt' also supports mercurial repositories. Post-Installation Messages `kiss' and `cpt' interact with `post-install' messages differently. `kiss' does not differentiate between post-installation scripts and post-installation messages, and will save the output of all scripts named `post-install' to be printed after the installation of all packages are complete. `cpt' on the other hand, separates these with the `message' file. `cpt' runs `post-install' without saving the output to be printed a second time. It instead prints all `message' files after the installation is over. Portability `kiss' aims to be as portable as possible. `cpt' aims to be portable, but favours performance. `cpt' depends on `rsync' for package installation, while `kiss' has removed the dependency in favour of portability. [rsync repositories] See section 6 8 CPT Library ============= `cpt-lib' is the library of Carbs Packaging Tools which can be used to extend the functionality of the package manager. This is the API documentation of the package manager library. 8.1 Calling the library ~~~~~~~~~~~~~~~~~~~~~~~ You can call the library on your scripts by adding the following line to your files: ,---- | #!/bin/sh -e | . cpt-lib `---- This will load the library inside your script, and will set some environment variables that are used inside the package manager. 8.2 Option parsing ~~~~~~~~~~~~~~~~~~ `cpt-lib' includes a POSIX-shell option parser inside named `getoptions'. You can see its own [documentation] for writing an option parser. The built-in version of the `getoptions' library is 2.5.0 and there are no plans for updating it apart from bug fixes. [documentation] 8.2.1 Defining a parser ----------------------- Some functions are called and set automatically when you call `cpt-lib', so you shouldn't define the option parser after calling the library, as some of the variables will already be set. If the function `parser_definition()' as defined when `cpt-lib' is called, cpt-lib will handle the option parsing itself by calling `getoptions' inside. Here is the proper way of doing it. ,---- | #!/bin/sh -e | | parser_definition() { | # The rest arguments MUST be defined as 'REST' | setup REST help:usage -- "usage: ${0##*/} [options] [pkg...]" | msg -- '' 'Options:' | flag CPT_TEST -t export:1 init:@export -- "Enable tests" | | global_options | } | | . cpt-lib `---- 8.2.2 `global_options()' ------------------------ The `global_options()' function is a simple convenience call to include flags that can be used inside most `cpt' tools. It defines the following flags: Flag Long Option Calls ----------------------------------- `-f' `--force' `CPT_FORCE' `-y' `--no-prompt' `CPT_PROMPT' `--root' `CPT_ROOT' `-h' `--help' `usage()' `-v' `--version' `version()' 8.3 Message functions ~~~~~~~~~~~~~~~~~~~~~ `cpt' has various functions to print information to users. 8.3.1 `out()' ------------- `out()' is a really simple function that prints messages to the standard output. It prints every argument with a newline. It is not meant to communicate with the user, it just exists to have a simple function to interact with other functions. ,---- | $ out "This is an example call" "How are you?" | This is an example call | How are you? `---- 8.3.2 `log()' ------------- `log()' is the most commonly used message function in the package manager. It is used to pretty print messages with visual cues, so it is easier to read and understand for the users. It changes message output for each argument it receives (takes up to three arguments). - If it takes a single argument, it prints a yellow leading arrow followed by colorless text. - If it takes two arguments, it prints a yellow leading arrow followed by the first argument (colored blue), and then followed by colorless second argument. - If it takes three arguments, instead of a yellow arrow, it prints the third argument in yellow, followed by the same two arguments as above. 8.3.3 `die()' ------------- `die()' wraps the `log()' function and exits with an error (1). It takes one or two arguments, which are sent to the `log()' function. The third argument for `log()' is set as `!>'. 8.3.4 `warn()' -------------- `warn()' is another function that wraps `log()'. In place of the third argument, it uses the word `WARNING'. 8.3.5 `prompt()' ---------------- `prompt()' is an interactive function that waits for user input to continue. It takes a single argument string to print a message, and then asks the user whether they want to continue or not. Prompts can be disabled by the user if they use a flag to disable them or set `CPT_PROMPT' to 0. 8.4 Text functions ~~~~~~~~~~~~~~~~~~ Following functions are used to manipulate, check, or interact with text. 8.4.1 `contains()' ------------------ `contains' function can be used to check whether a list variable contains a given string. If the string is inside the list, it will return 0, otherwise 1. ,---- | # Usage | contains "$LIST" foo | | contains "foo bar" foo # Returns 0 | contains "foo bar" baz # Returns 1 `---- 8.4.2 `regesc()' ---------------- `regesc()' can be used to escape regular expression characters that are defined in POSIX BRE. Those characters are, `$', `.', `*', `[', `\\', and `^'. ,---- | regesc '^[$\' # Returns \^\[\$\\ `---- 8.4.3 `pop()' ------------- `pop()' can be used to remove a word from a "string list" without a `sed' call. Word splitting is intentional when using this function. ,---- | # Usage | pop foo from $LIST | | pop foo from foo baz bar # Returns baz bar `---- 8.4.4 `sepchar()' ----------------- This function can be used to separate characters from the given string without resorting to external resources. ,---- | sepchar mystring | # Prints: | # m | # y | # s | # t | # r | # i | # n | # g `---- 8.5 Portability functions ~~~~~~~~~~~~~~~~~~~~~~~~~ These helper functions are used so that we don't depend on non-POSIX programs for certain functionality. They are prefixed with the `_' character. 8.5.1 `_seq()' -------------- This function is similar to `seq(1)' except that it only takes a single argument and doesn't print any newlines. It is suitable to be used in `for' loops. ,---- | _seq 5 | # Prints: | # 1 2 3 4 5 `---- 8.5.2 `_stat()' --------------- This function imitates `stat %U'. `stat' isn't defined by POSIX, and this is also a GNU extension. This function returns the owner of a file. If the owner cannot be found, it will return `root'. 8.5.3 `_readlinkf()' -------------------- This function was taken from [POSIX sh readlinkf library by Koichi Nakashima]. `readlink' is also not defined by POSIX, so this function uses `ls' to follow symbolic links until it reaches the actual file. [POSIX sh readlinkf library by Koichi Nakashima] 8.6 System Functions ~~~~~~~~~~~~~~~~~~~~ 8.6.1 `as_root()' ----------------- `as_root()' calls the rest of the arguments as a different user. Unless a `$user' environment variable is set, it will call the following arguments as the root user. It supports the following programs for privilege escalation with the following order: 1. `ssu' 2. `sudo' 3. `doas' 4. `su' The program called for this operation can be overridden using the `$CPT_SU' variable. 8.7 Package Functions ~~~~~~~~~~~~~~~~~~~~~ Obviously, package functions are the most important ones for `cpt-lib', those are the ones you will use to build, to query, to manipulate, or to otherwise interact with packages. 8.7.1 `pkg_build()' ------------------- This function builds all given packages. It resolves dependencies for the given packages, lints the package, extracts its sources and runs the `build' script. ,---- | # Example | | # Create the cache directories first, this is where the package will be built. | create_cache | | # Build the package(s) you want to build. | pkg_build cpt `---- 8.7.2 `pkg_depends()' --------------------- This function calculates the dependencies for the requested package, returning the variable `$deps'. This variable can then be passed to [pkg_order()] in order to generate an ordered list for building packages. [pkg_order()] See section 8.7.3 8.7.3 `pkg_order()' ------------------- This function receives package names and returns `$order' and `$redro' variables that can be used for building and removing packages. 8.7.4 `pkg_owner()' ------------------- This function can be used to determine the owner of a package. The first argument is used for flags that will be passed to `grep', and the second one is for the file query. Rest of the arguments can be used in order to specify the manifests to be used, but it is optional. `pkg_owner()' will search for all the installed packages if no other arguments are given. ,---- | # Example | pkg_owner -lFx /usr/bin/grep # Returns 'busybox' | | # An example call made by `pkg_fix_deps()` to figure out whether the built | # package contains the file it depends. | pkg_owner -l "/${dep#/}\$" "$PWD/manifest" >/dev/null && continue | pkg_owner -l "/${dep#/}\$" "$@" ||: `---- 8.7.5 `pkg_isbuilt()' --------------------- This function returns with success when the given package has a built tarball with the matching version and release strings from the repository. 8.7.6 `pkg_lint()' ------------------ This function checks whether a given package fits the proper package specification. This function *does not return with failure, it exits outright* if it fails. 8.7.7 `pkg_find()' ------------------ `pkg_find()' is the tool for searching packages. It accepts up to 3 arguments. $1: Query This is the only mandatory argument. It accepts globbing, meaning that shell wildcards can be used in the query. $2: Match If this exists `pkg_find()' will print every single match found in the search path. If it doesn't, `pkg_find()' will print the first match and exit. $3: Type This is the argument to be passed to the `test' function. Unless this argument is given, it defaults to `-d', which tests for directories. ,---- | # Returns the first match of cpt | pkg_find cpt | | # Returns all matches of cpt | pkg_find cpt all | | # Returns all globbed matches for cpt* (e.g. cpt and cpt-extra) | pkg_find 'cpt*' all | | # Returns all matching cpt-* executables on user's PATH | SEARCH_PATH=$PATH pkg_find 'cpt-*' all -x `---- 8.7.8 `pkg_get_base()' ---------------------- This function returns the base packages as defined in `/etc/cpt-base'. If an optional argument is present, it will print all package names in a single line. If it is not given any arguments, it will return one package per line. See 4.1 for more information on base packages. 8.7.9 `pkg_gentree()' --------------------- This function generates a dependency tree for the given package. The output and the dependency generation can be configured through a series of keys given as the second argument. Those keys are: `b' Include the base packages to the dependency tree. `f' Include the given package itself to the generated tree. `x' Do not include make dependencies of the package. `r' Print the generated tree in reverse order. `n' Print all packages in a single line instead of a package per line. * 8.7.9.1 Examples This example uses the `cpt' package for Carbs Linux. The package itself is listed to depend on `curl' and `rsync'. Here is the output of calling the function for cpt directly: ,---- | $ pkg_gentree cpt | bearssl | ca-certificates | zlib | curl | rsync `---- The example above shows that even though `cpt' itself only depends on `curl' and `rsync', we also indirectly need `zlib', `bearssl' (for `curl'), and `ca-certificates' (for `bearssl'). ,---- | # Print the dependency tree reverse sorted in a single line: | $ pkg_gentree cpt rn | rsync curl zlib ca-certificates bearssl `---- 8.7.10 `pkg_query_meta()' ------------------------- This function is used to query the [meta file] inside package directories. It can be used to retrieve information on a package that is otherwise irrelevant to the package manager itself. It takes two arguments, first being the package and the second being the key to be retrieved. If the package does not have a `meta' file or the file does not contain the requested key, the function will return with 1. ,---- | $ pkg_query_meta cpt description | Carbs Packaging Tools `---- [meta file] See section 5.6