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Fixes <https://issues.guix.gnu.org/61722>.
* guix/cpio.scm (file->cpio-header): Compute the file name length in bytes rather than in
characters.
(file->cpio-header*, special-file->cpio-header*): Likewise.
(write-cpio-archive): Likewise, and write the file name as UTF-8 bytes, not
textually, to avoid encoding it as ISO-8859-1.
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* guix/cpio.scm (device-number, device->major+minor):
Move to, and subsequently import from, …
* guix/build/syscalls.scm (device-number, device-number->major+minor):
…here. Note the slight name change.
(mounts): Replace 16-bit open code with a DEVICE-NUMBER call.
* gnu/build/linux-boot.scm (device-number):
Remove duplicate 16-bit implementation in favour of the one above.
(resume-if-hibernated): Reuse DEVICE-NUMBER->MAJOR+MINOR.
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“dev_t in glibc is a 64-bit quantity, with 32-bit major and minor
numbers.” — glibc's <bits/sysmacros.h>
The "tests/cpio.scm" was failing because (guix cpio) treated it as a
16-bit quantity instead, leading to header mismatches with the GNU cpio
reference output.
* guix/cpio.scm (device-number, device->major+minor): Use all the bits.
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* guix/cpio.scm (special-file->cpio-header*): New public procedure.
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* guix/cpio.scm (make-cpio-header): Handle size correctly for all file types.
(mode->type): Add 'block-special, 'char-special.
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* guix/cpio.scm (file->cpio-header*): New procedure.
* gnu/build/linux-initrd.scm (write-cpio-archive): Add #:file->header argument
to 'cpio:write-cpio-archive'.
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* guix/cpio.scm, tests/cpio.scm: New files.
* Makefile.am (MODULES): Add guix/cpio.scm.
(SCM_TESTS): Add tests/cpio.scm.
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