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|
librefetch(8) -- downloads or creates a liberated source tarball
================================================================
## SYNOPSIS
`librefetch` [<OPTIONS>] <SOURCE-URL> [<OUTPUT-FILE>]<br>
`librefetch` `-`[`g`|`P`|`h`]
## DESCRIPTION
`librefetch` is a program to streamline creation of custom source
tarballs for `PKGBUILD(5)` files.
If a URL mentioned in the `source` array in a `PKGUILD` is in a
location that Parabola uploads "custom" source tarballs (or configured
locations), and no file is at that URL, librefetch will automatically
create it for you.
This works because a post-install script for the package configures
`librefetch` as the download agent for `https://` URLs in
`makepkg.conf`; allowing it to jump in and create a file if need be.
Because of this, it is almost never necessary to call `librefetch`
manually.
The post-install script also configures `librefetch` as the download
agent for `libre://` URLs, for compatability with PKGBUILDs that used
a previous version of librefetch.
There are 5 modes:
* `download`: Download the tarball from the configured mirror.
* `create`: Create the tarball from a `PKGBUILD`/`SRCBUILD`.
* `checksums`: Generate integrity checks for source files.
* `print`: Print the effective build script.
* `help`: Print `librefetch` usage information.
The normal mode of operation is `download` mode. If `download` mode
fails, it may choose to try `create` mode.
## OPTIONS
* `-C`: Force `create` mode (don't download)
* `-D`: Force `download` mode (don't create)
* `-p` <file>: Use an alternate build script for `create` mode
(instead of `PKGBUILD`). If an `SRCBUILD` file exists in the same
directory, it is used instead.
* `-g` | `--geninteg`: Use `checksums` mode: Generate integrity
checks for source files.
* `-P` | `--print`: Use `print` mode: print the effective build script.
* `-h` | `--help`: Use `help` mode: Show useage information.
## DOWNLOAD MODE
If <SOURCE-URL> begins with the string `libre://`, it is replaced with
the first value in `MIRRORS`, as configured in `librefetch.conf(5)`;
this is for compatability with PKGBUILDs that used a previous version
of librefetch.
It uses `DOWNLOADER`, as configured in `librefetch.conf` to attempt to
download the source tarball from that URL. If that fails, and
following conditions are met, it proceeds to `create` mode:
* The `-D` flag has not been specified to inhibit `create` mode.
* The `<source-url>` begins with one of the values in `MIRRORS`.
The latter requirement allows librefetch to be used as a generic
HTTP(S) download agent, that can automatically create files from
whitelisted locations.
## CREATE MODE
The principle of `create` mode is that a special `PKGBUILD(5)`, called
a `SRCBUILD(5)`, installs source files to `$pkgdir`, and the resulting
"package" is then used as a source tarball. The `SRCBUILD` exists in
the same directory as the `PKGBUILD`. It can be created manually, or
generated on-the-fly from the `PKGBUILD`. Extra steps are taken to
ensure that as long as the same directory contents go in, an identical
tarball will come out--the checksum of the file should not change
based on when it is built or who builds it.
The `SRCBUILD` is either created, or sanitized if it already exists,
then fed to a modified version of `makepkg(8)`.
The purpose of the modified `makepkg` is so that the resulting tarball
doesn't contain package metadata, doesn't end with a .pkg file
extension, and always produces an identicle tarball.
When this documentation speaks of a file being modified, it is a
temporary copy of the file that is modified, your original file will
remain intact.
## SRCBUILD GENERATION
As explained in the `CREATE MODE` section, in `create` mode, this
program generates an `SRCBUILD` file. For debugging purposes, this
file can be printed instead of executed with `print` mode.
### PRE-EXISTING SRCBUILD
The use of `SRCBUILD` files pre-dates `librefetch`. By convention,
they set `PKGDEST` and `PKGEXT` in `package()` in order to modify the
behavior of `makepkg`. Because a modified version of `makepkg` is
used, this interferes with the correct behavior. To compensate for
this, lines containing "`PKGDEST=`" or "`PKGEXT=`" are deleted from
the `SRCBUILD`.
The general idea is that `build()` makes any modifications to the
source, then `package()` copies it from `$srcdir` to `$pkgdir`.
### SRCBUILD FROM PKGBUILD
Possibly more elegant than having a separate `SRCBUILD` file is having
an `mksource()` function in the main `PKGBUILD`. This results in less
boilerplate and fewer files to edit.
Note that this only happens if a file named `SRCBUILD` doesn't already
exist; when migrating a package from a manually created `SRCBUILD` to
this method, the `SRCBUILD` must be deleted (or renamed) for this to
work.
The dynamically created `SRCBUILD` is created by copying `PKGBUILD` to
a temorary file, then re-setting variables and re-defining functions.
Following is a table of the translations.
Variables
source = mksource
noextract = mknoextract
*sums = mk*sums (md5, sha1, sha256, sha384, sha512)
depends = <empty>
checkdepends = <empty>
makedepends = mkdepends
Functions
prepare() { :; }
build() { mksource; }
check() { :; }
package() { cp -a "$srcdir"/*/ "$pkgdir/"; }
The `mksource()` function does not need to be defined. If it isn't
defined, then no transformations will be made to the source between it
being extracted to `$srcdir` and copied to `$pkgdir`.
In summary:
* Set `mksource=()` and `mkmd5sums=(`) to act as `source=(`) and
`md5sums=()`
* Declare a `mksource()` function to make modifications to the
source, if nescessary.
Other changes:
* `pkgname` is set to `pkgbase`, or the first element of the
`pkgname` array.
* `options=()` is set have `makepkg` avoid making changes to
`$pkgdir`. The exact change is:
options=(!strip docs libtool staticlibs emptydirs !zipman purge !upx)
* `PURGE_TARGETS=()` has vcs directories added to it:
PURGE_TARGETS=(.bzr/ .cvs/ .git/ .hg/ .svn/ .makepkg/)
### MAKEPKG MODIFICATIONS
The following modifications are made to makepkg:
* Allow us to manipulate the output file (`$pkg_file`)
* Do not include metadata in the output file (`${comp_files[@]}`)
* Force 'ustar' tar format, don't allow it to upgrade to 'pax' to
store extended file attributes.
* Don't symlink the resulting file into the current directory.
* `PURGE_TARGETS` interprets an item as a directory if it ends with a
slash ("/").
* Timestamps in `$pkgdir` are reset to "1990-01-01 0:0:0 +0", so that
the resulting tarball will be the same, regardless of when it was
created.
* Sort the files included in the tarball; normally the order of files
in a tarball is essentially random (even if it tends to be the same
when re-created on the same machine).
* append `-libre` to `$srcdir`
* append `-libre` to `$pkgbasedir` (which becomes `$pkgdir`)
* Don't check if the package has already been built.
## CONFIGURATION
See `librefetch.conf(5)` for details on configuring librefetch using
the `librefetch.conf` file.
## SEE ALSO
librefetch.conf(5), makepkg(8), PKGBUILD(5), SRCBUILD(5)
|
