Re: [pbs-devel] building proxmox-backup-qemu

Re: [pbs-devel] building proxmox-backup-qemu

[Niko Fellner]

> I just added it to the build-depends as well.
> [...]
> diff --git a/Cargo.toml b/Cargo.toml
> [...]
> with proxmox-backup checked out next to proxmox-backup-qemu

Thanks, I've applied your patch, and obviously the cbindgen package was installed, but I still get the same error. Here is my log:


After successfully building the latest proxmox-backup in ~/proxmox-backup:
> root@debian:~/proxmox-backup# cd ~ && \
> git clone git://git.proxmox.com/git/proxmox-backup-qemu.git && \
> cd proxmox-backup-qemu && nano Cargo.toml

I applied your patch (change proxmox version to "0.8.0" and use proxmox-backup from path = "../proxmox-backup" instead of git://git.proxmox.com...).

> root@debian:~/proxmox-backup-qemu# mk-build-deps -ir
> dh_testdir
> dh_testroot
> dh_prep
> dh_testdir
> dh_testroot
> dh_install
> dh_installdocs
> dh_installchangelogs
> dh_compress
> dh_fixperms
> dh_installdeb
> dh_gencontrol
> dh_md5sums
> dh_builddeb
> dpkg-deb: Paket »proxmox-backup-qemu-build-deps« wird in »../proxmox-backup-qemu-build-deps_1.0.2-1_all.deb« gebaut.
> The package has been created.
> Attention, the package has been created in the current directory,
> not in ".." as indicated by the message above!
> Vormals nicht ausgewähltes Paket proxmox-backup-qemu-build-deps wird gewählt.
> (Lese Datenbank ... 247817 Dateien und Verzeichnisse sind derzeit installiert.)
> Vorbereitung zum Entpacken von proxmox-backup-qemu-build-deps_1.0.2-1_all.deb ...
> Entpacken von proxmox-backup-qemu-build-deps (1.0.2-1) ...
> Paketlisten werden gelesen... Fertig
> Abhängigkeitsbaum wird aufgebaut.       
> Statusinformationen werden eingelesen.... Fertig
> Abhängigkeiten werden korrigiert ...Starting pkgProblemResolver with broken count: 0
> Starting 2 pkgProblemResolver with broken count: 0
> Done
>  Fertig
> Starting pkgProblemResolver with broken count: 0
> Starting 2 pkgProblemResolver with broken count: 0
> Done
> Die folgenden zusätzlichen Pakete werden installiert:
>   cbindgen librust-bincode-dev
> Vorgeschlagene Pakete:
>   librust-bincode+i128-dev
> Die folgenden NEUEN Pakete werden installiert:
>   cbindgen librust-bincode-dev
> 0 aktualisiert, 2 neu installiert, 0 zu entfernen und 0 nicht aktualisiert.
> 1 nicht vollständig installiert oder entfernt.
> Es müssen 1.331 kB an Archiven heruntergeladen werden.
> Nach dieser Operation werden 5.264 kB Plattenplatz zusätzlich benutzt.
> Möchten Sie fortfahren? [J/n] Y
> Holen:1 http://deb.debian.org/debian buster/main amd64 cbindgen amd64 0.14.4-1~deb10u1 [1.316 kB]
> Holen:2 http://deb.debian.org/debian buster/main amd64 librust-bincode-dev amd64 1.0.1-1 [14,6 kB]
> Es wurden 1.331 kB in 0 s geholt (6.094 kB/s).  
> Vormals nicht ausgewähltes Paket cbindgen wird gewählt.
> (Lese Datenbank ... 247821 Dateien und Verzeichnisse sind derzeit installiert.)
> Vorbereitung zum Entpacken von .../cbindgen_0.14.4-1~deb10u1_amd64.deb ...
> Entpacken von cbindgen (0.14.4-1~deb10u1) ...
> Vormals nicht ausgewähltes Paket librust-bincode-dev:amd64 wird gewählt.
> Vorbereitung zum Entpacken von .../librust-bincode-dev_1.0.1-1_amd64.deb ...
> Entpacken von librust-bincode-dev:amd64 (1.0.1-1) ...
> cbindgen (0.14.4-1~deb10u1) wird eingerichtet ...
> librust-bincode-dev:amd64 (1.0.1-1) wird eingerichtet ...
> proxmox-backup-qemu-build-deps (1.0.2-1) wird eingerichtet ...
> Trigger für man-db (2.8.5-2) werden verarbeitet ...

> root@debian:~/proxmox-backup-qemu# make
> cargo build 
> error: no matching package named `cbindgen` found
> location searched: registry `https://github.com/rust-lang/crates.io-index`
> perhaps you meant: bindgen
> required by package `proxmox-backup-qemu v1.0.2 (/root/proxmox-backup-qemu)`
> make: *** [Makefile:22: all] Fehler 101

> root@debian:~/proxmox-backup-qemu# apt-get install cbindgen
> Paketlisten werden gelesen... Fertig
> Abhängigkeitsbaum wird aufgebaut.       
> Statusinformationen werden eingelesen.... Fertig
> cbindgen ist schon die neueste Version (0.14.4-1~deb10u1).
> cbindgen wurde als manuell installiert festgelegt.
> 0 aktualisiert, 0 neu installiert, 0 zu entfernen und 0 nicht aktualisiert.

> root@debian:~/proxmox-backup-qemu# cargo build
> error: no matching package named `cbindgen` found
> location searched: registry `https://github.com/rust-lang/crates.io-index`
> perhaps you meant: bindgen
> required by package `proxmox-backup-qemu v1.0.2 (/root/proxmox-backup-qemu)`

> root@debian:~/proxmox-backup-qemu# cat /etc/apt/sources.list.d/proxmox-devel.list 
> deb http://download.proxmox.com/debian/devel/ buster main

> root@debian:~/proxmox-backup-qemu# ls -a /usr/share/cargo/registry/c
> cc-1.0.50/               clang-sys-0.29.3/        crossbeam-channel-0.4.2/
> cexpr-0.4.0/             clap-2.33.0/             crossbeam-utils-0.7.2/
> cfg-if-0.1.10/           crc32fast-1.2.0/         
> root@debian:~/proxmox-backup-qemu# ls -a /usr/share/cargo/registry/c^C

Is the "location searched: registry `https://github.com/rust-lang/crates.io-index`" correct?

Re: [pbs-devel] building proxmox-backup-qemu

[Fabian Grünbichler]

On November 30, 2020 8:11 pm, Niko Fellner wrote:
>> I just added it to the build-depends as well.
>> [...]
>> diff --git a/Cargo.toml b/Cargo.toml
>> [...]
>> with proxmox-backup checked out next to proxmox-backup-qemu
> 
> Thanks, I've applied your patch, and obviously the cbindgen package was installed, but I still get the same error. Here is my log:
> 
> 
> After successfully building the latest proxmox-backup in ~/proxmox-backup:
>> root@debian:~/proxmox-backup# cd ~ && \
>> git clone git://git.proxmox.com/git/proxmox-backup-qemu.git && \
>> cd proxmox-backup-qemu && nano Cargo.toml
> 
> I applied your patch (change proxmox version to "0.8.0" and use proxmox-backup from path = "../proxmox-backup" instead of git://git.proxmox.com...).
> 
>> root@debian:~/proxmox-backup-qemu# mk-build-deps -ir
>> dh_testdir
>> dh_testroot
>> dh_prep
>> dh_testdir
>> dh_testroot
>> dh_install
>> dh_installdocs
>> dh_installchangelogs
>> dh_compress
>> dh_fixperms
>> dh_installdeb
>> dh_gencontrol
>> dh_md5sums
>> dh_builddeb
>> dpkg-deb: Paket »proxmox-backup-qemu-build-deps« wird in »../proxmox-backup-qemu-build-deps_1.0.2-1_all.deb« gebaut.
>> The package has been created.
>> Attention, the package has been created in the current directory,
>> not in ".." as indicated by the message above!
>> Vormals nicht ausgewähltes Paket proxmox-backup-qemu-build-deps wird gewählt.
>> (Lese Datenbank ... 247817 Dateien und Verzeichnisse sind derzeit installiert.)
>> Vorbereitung zum Entpacken von proxmox-backup-qemu-build-deps_1.0.2-1_all.deb ...
>> Entpacken von proxmox-backup-qemu-build-deps (1.0.2-1) ...
>> Paketlisten werden gelesen... Fertig
>> Abhängigkeitsbaum wird aufgebaut.       
>> Statusinformationen werden eingelesen.... Fertig
>> Abhängigkeiten werden korrigiert ...Starting pkgProblemResolver with broken count: 0
>> Starting 2 pkgProblemResolver with broken count: 0
>> Done
>>  Fertig
>> Starting pkgProblemResolver with broken count: 0
>> Starting 2 pkgProblemResolver with broken count: 0
>> Done
>> Die folgenden zusätzlichen Pakete werden installiert:
>>   cbindgen librust-bincode-dev
>> Vorgeschlagene Pakete:
>>   librust-bincode+i128-dev
>> Die folgenden NEUEN Pakete werden installiert:
>>   cbindgen librust-bincode-dev
>> 0 aktualisiert, 2 neu installiert, 0 zu entfernen und 0 nicht aktualisiert.
>> 1 nicht vollständig installiert oder entfernt.
>> Es müssen 1.331 kB an Archiven heruntergeladen werden.
>> Nach dieser Operation werden 5.264 kB Plattenplatz zusätzlich benutzt.
>> Möchten Sie fortfahren? [J/n] Y
>> Holen:1 http://deb.debian.org/debian buster/main amd64 cbindgen amd64 0.14.4-1~deb10u1 [1.316 kB]
>> Holen:2 http://deb.debian.org/debian buster/main amd64 librust-bincode-dev amd64 1.0.1-1 [14,6 kB]

these are from stock Debian Buster repos, not from our devel repo which 
contains newer versions of many of our dependencies, and the toolchain 
itself.

>> Es wurden 1.331 kB in 0 s geholt (6.094 kB/s).  
>> Vormals nicht ausgewähltes Paket cbindgen wird gewählt.
>> (Lese Datenbank ... 247821 Dateien und Verzeichnisse sind derzeit installiert.)
>> Vorbereitung zum Entpacken von .../cbindgen_0.14.4-1~deb10u1_amd64.deb ...
>> Entpacken von cbindgen (0.14.4-1~deb10u1) ...
>> Vormals nicht ausgewähltes Paket librust-bincode-dev:amd64 wird gewählt.
>> Vorbereitung zum Entpacken von .../librust-bincode-dev_1.0.1-1_amd64.deb ...
>> Entpacken von librust-bincode-dev:amd64 (1.0.1-1) ...
>> cbindgen (0.14.4-1~deb10u1) wird eingerichtet ...
>> librust-bincode-dev:amd64 (1.0.1-1) wird eingerichtet ...
>> proxmox-backup-qemu-build-deps (1.0.2-1) wird eingerichtet ...
>> Trigger für man-db (2.8.5-2) werden verarbeitet ...
> 
>> root@debian:~/proxmox-backup-qemu# make
>> cargo build 
>> error: no matching package named `cbindgen` found
>> location searched: registry `https://github.com/rust-lang/crates.io-index`
>> perhaps you meant: bindgen
>> required by package `proxmox-backup-qemu v1.0.2 (/root/proxmox-backup-qemu)`
>> make: *** [Makefile:22: all] Fehler 101
> 
>> root@debian:~/proxmox-backup-qemu# apt-get install cbindgen
>> Paketlisten werden gelesen... Fertig
>> Abhängigkeitsbaum wird aufgebaut.       
>> Statusinformationen werden eingelesen.... Fertig
>> cbindgen ist schon die neueste Version (0.14.4-1~deb10u1).
>> cbindgen wurde als manuell installiert festgelegt.
>> 0 aktualisiert, 0 neu installiert, 0 zu entfernen und 0 nicht aktualisiert.
> 
>> root@debian:~/proxmox-backup-qemu# cargo build
>> error: no matching package named `cbindgen` found
>> location searched: registry `https://github.com/rust-lang/crates.io-index`
>> perhaps you meant: bindgen
>> required by package `proxmox-backup-qemu v1.0.2 (/root/proxmox-backup-qemu)`
> 
>> root@debian:~/proxmox-backup-qemu# cat /etc/apt/sources.list.d/proxmox-devel.list 
>> deb http://download.proxmox.com/debian/devel/ buster main
> 
>> root@debian:~/proxmox-backup-qemu# ls -a /usr/share/cargo/registry/c
>> cc-1.0.50/               clang-sys-0.29.3/        crossbeam-channel-0.4.2/
>> cexpr-0.4.0/             clap-2.33.0/             crossbeam-utils-0.7.2/
>> cfg-if-0.1.10/           crc32fast-1.2.0/         
>> root@debian:~/proxmox-backup-qemu# ls -a /usr/share/cargo/registry/c^C
> 
> Is the "location searched: registry `https://github.com/rust-lang/crates.io-index`" correct?

yes. the repo contains a .cargo/config file that says "all stuff that 
you want from crates.io is actually available in 
/usr/share/cargo/registry", which is where all the packaged crates put 
their source code. cargo still "thinks" it's talking to crates.io ;)

you need to
1.) enable our devel repo
2.) upgrade the installed toolchain and crate packages
3.) install librust-cbindgen-dev in addition to cbindgen (the latter is
the binary, the former contains the source code to satisfy cargo that 
the crate is available)
4.) possibly install other librust-*-dev packages referenced by 
Cargo.toml, if it still complains on make

Re: [pbs-devel] building proxmox-backup-qemu

[Niko Fellner]

> 3.) install librust-cbindgen-dev in addition to cbindgen (the latter is
> the binary, the former contains the source code to satisfy cargo that 
> the crate is available)

That was the missing part for me! Maybe you can add it to the dependencies aswell?

Thanks a lot! :)

Here is everything together:

# Basic setup
echo 'deb http://download.proxmox.com/debian/devel/ buster main' >> /etc/apt/sources.list.d/proxmox-devel.list
wget http://download.proxmox.com/debian/proxmox-ve-release-6.x.gpg -O /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg && \
apt-get update && \ 
apt-get install -y devscripts debcargo clang

# Build PBS
apt-get update && apt-get dist-upgrade -y && \
git clone git://git.proxmox.com/git/proxmox-backup.git && cd proxmox-backup/ && \
#git checkout v1.0.3 && \
mk-build-deps -ir; mk-build-deps -ir && \
make && make install

# Build proxmox-backup-qemu
cd ~ && git clone git://git.proxmox.com/git/proxmox-backup-qemu.git && \
cd proxmox-backup-qemu && \
# Optionally: add some changes to the rust sourcecode :) \
sed -i 's/speed={:.2}MB/speed={:.2}MiB/' src/restore.rs && \
# Changes to Cargo.toml according to https://lists.proxmox.com/pipermail/pbs-devel/2020-November/001635.html \
sed -i 's/proxmox = { version = "0.7.0"/proxmox = { version = "0.8.0"/' Cargo.toml && \
sed -i 's/proxmox-backup = { git = "git:\/\/git.proxmox.com\/git\/proxmox-backup.git", tag = "v1.0.4" }/#proxmox-backup = { git = "git:\/\/git.proxmox.com\/git\/proxmox-backup.git", tag = "v1.0.4" }/' Cargo.toml && \
sed -i 's/#proxmox-backup = { path = "..\/proxmox-backup" }/proxmox-backup = { path = "..\/proxmox-backup" }/' Cargo.toml && \
apt-get install -y librust-cbindgen-dev && \
export BUILD_MODE=release && \
mk-build-deps -ir && make && make deb && make install

# You can use the .deb files in the proxmox-backup-qemu directory directly now or ship them to the target Proxmox installation
dpkg -i libproxmox-backup-qemu*



# Optionally - if you want to build a new pbs-restore binary (for me that's not neccessary; I'm happy with the libs from proxmox-backup-qemu):
# Build pve-qemu. Requires either proxmox-backup-qemu libs (see above) or a PVE installation
cd ~ && git clone git://git.proxmox.com/git/pve-qemu.git && \
cd pve-qemu && apt-get install -y libaio-dev libcap-ng-dev libfdt-dev libglusterfs-dev libiscsi-dev libjemalloc-dev \
libjpeg-dev libnuma-dev libpci-dev libpixman-1-dev librbd-dev libsdl1.2-dev \
libseccomp-dev libspice-protocol-dev libspice-server-dev libusb-1.0-0-dev libusbredirparser-dev texi2html texinfo xfslibs-dev && \
mk-build-deps -ir && make && \
apt-get install -y ceph-common numactl python-cephfs python-prettytable python-rados python-rbd python-requests python3-prettytable libboost-program-options1.67.0 libgoogle-perftools4 libradosstriper1 python-certifi python-chardet python-idna python-urllib3 python-chardet libcephfs2 python-pkg-resources python-six libtcmalloc-minimal4 && \
dpkg -i pve-qemu*.deb

Re: [pbs-devel] building proxmox-backup-qemu

[Fabian Grünbichler]

On November 29, 2020 11:20 am, Niko Fellner wrote:
> Hi,

thanks for your interest! there are unfortunately still some rough edges 
around building all the pieces that make up PBS.. I hope the following 
gives you enough information to continue experimenting!

> I originally posted this question in #3163#c9, but here my question is better placed:
> 
>> This is because for restore, the binary is actually created from our patched
>> QEMU source code which just links against the Rust library, see
>> 'pbs-restore.c' in our QEMU sources (i.e. clone pve-qemu repo, then apply
>> the patches in 'debian/patches/series' to the 'qemu' submodule).
>>
> 
> 
> So if I want to build the "pbs-restore" binary, I need to make "pve-qemu":

yes, if you want to change the qemu/C part of that binary, and not just 
the rust part interfaces with PBS directly, which is in 
proxmox-backup-qemu (libproxmox-backup-qemu0.so).

>> cd ~ && git clone git://git.proxmox.com/git/pve-qemu.git && \
>> cd pve-qemu && apt-get install libaio-dev libcap-ng-dev libfdt-dev \
>> libglusterfs-dev libiscsi-dev libjemalloc-dev libjpeg-dev libnuma-dev \
>> libpci-dev libpixman-1-dev librbd-dev libsdl1.2-dev libseccomp-dev \
>> libspice-protocol-dev libspice-server-dev libusb-1.0-0-dev \
>> libusbredirparser-dev texi2html texinfo xfslibs-dev && \
>> mk-build-deps -ir && make
> 
> 
> Which results in the binaries "/pve-qemu-kvm-5.1.0/pbs-restore" and "pve-qemu-kvm-5.1.0/debian/pve-qemu-kvm/usr/bin/pbs-restore" (What's their difference?)

the former is the built binary, the latter is where it is put by the 
install step run as part of building a debian package. if they differ, 
it's likely because the latter binary is stripped of debugging symbols 
(which are put into a separate binary package).

it basically boils down to:
- build
- install to tmpdir under debian/..
- do more packaging-related transformations on copy in debian/..
- take files from debian/.. to make .deb packages

we do that whole process inside a(nother) temp/build dir ("pve-qemu-kvm-5.1.0")

> Making pve-qemu requires "libproxmox-backup-qemu0".
> "libproxmox-backup-qemu0" is either supplied by installing PVE...
> 
>> echo 'deb http://download.proxmox.com/debian/pve buster pvetest' >> \
>> /etc/apt/sources.list.d/proxmox-devel.list && \
>> apt-get update && apt-get dist-upgrade -y && \
>> apt-get install proxmox-ve
> 
> 
> ... or by building it from source. I am interested about building it myself, of course. I guess this repository is what I need:
> https://git.proxmox.com/?p=proxmox-backup-qemu.git;a=summary

yes :)

> But when I do ...
> 
>> cd ~ && git clone git://git.proxmox.com/git/proxmox-backup-qemu.git && \
>> cd proxmox-backup-qemu && \
>> # checkout a commit which seems to be compatible for v1.0.3, see #3173#c1 \
>> git checkout 1e45883f00ca8b0dd04c84f4ae33752e69cfc5bb && \
>> # need to install PVE too meet the dependencies for the next one: \
>> mk-build-deps -ir && \
>> # I can't meet all dependencies for the next one: \
>> make
> 
> 
> ...with the "make" I get the following error message:
> 
>> error: no matching package named `cbindgen` found
>> location searched: registry `https://github.com/rust-lang/crates.io-index`
>> perhaps you meant: bindgen
>> required by package `proxmox-backup-qemu v1.0.0 (/root/proxmox-backup-qemu)`
>> make: *** [Makefile:22: all] Fehler 101
> 
> 
> Where do I get "cbindgen" from? What's the correct way to build proxmox-backup-qemu?

$ apt install cbindgen

(after having enabled our 'devel' repo, which ships our rust toolchain, 
debcargo, lots of librust-* packages/backports, and some other build/dev 
releated tools)

I just added it to the build-depends as well.

proxmox-backup-qemu is a bit special/awkward in that it depends on 
proxmox-backup (as library), but the packaging of proxmox-backup does 
not produce a library package that we can properly depend on (that 
particular refactoring is still on our todo list, as it's quite 
involved). as a result of this awkwardness, debian/control is rather 
incomplete and you need to look at Cargo.toml to get the full picture. 
besides cbindgen, you also need to install the librust-*-dev packages 
corresponding to the crates mentioned in Cargo.toml, plus those used by 
the proxmox-backup crate.

we're currently in the middle of a breaking change in the proxmox crate 
(0.8, which is not compatible with 0.7). proxmox-backup in git is 
already made compatible, so to build proxmox-backup-qemu now you need to 
point it at proxmox 0.8 and proxmox-backup git (until the next 
proxmox-backup version is bumped+tagged):

diff --git a/Cargo.toml b/Cargo.toml
index 7f29d0a..c87bf5a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,9 +27,9 @@ lazy_static = "1.4"
 libc = "0.2"
 once_cell = "1.3.1"
 openssl = "0.10"
-proxmox = { version = "0.7.0", features = [ "sortable-macro", "api-macro" ] }
-proxmox-backup = { git = "git://git.proxmox.com/git/proxmox-backup.git", tag = "v1.0.4" }
-#proxmox-backup = { path = "../proxmox-backup" }
+proxmox = { version = "0.8.0", features = [ "sortable-macro", "api-macro" ] }
+#proxmox-backup = { git = "git://git.proxmox.com/git/proxmox-backup.git", tag = "v1.0.4" }
+proxmox-backup = { path = "../proxmox-backup" }
 serde_json = "1.0"
 tokio = { version = "0.2.9", features = [ "blocking", "fs", "io-util", "macros", "rt-threaded", "signal", "stream", "tcp", "time", "uds" ] }
 bincode = "1.0"

with proxmox-backup checked out next to proxmox-backup-qemu

hope this helps, if you run into further issues don't hesitate to ask 
(including full error messages always helps :))

[pbs-devel] building proxmox-backup-qemu

[Niko Fellner]

[-- Attachment #1: Type: text/plain, Size: 2458 bytes --]

Hi,

I originally posted this question in #3163#c9, but here my question is better placed:

> This is because for restore, the binary is actually created from our patched
> QEMU source code which just links against the Rust library, see
> 'pbs-restore.c' in our QEMU sources (i.e. clone pve-qemu repo, then apply
> the patches in 'debian/patches/series' to the 'qemu' submodule).
>


So if I want to build the "pbs-restore" binary, I need to make "pve-qemu":

> cd ~ && git clone git://git.proxmox.com/git/pve-qemu.git && \
> cd pve-qemu && apt-get install libaio-dev libcap-ng-dev libfdt-dev \
> libglusterfs-dev libiscsi-dev libjemalloc-dev libjpeg-dev libnuma-dev \
> libpci-dev libpixman-1-dev librbd-dev libsdl1.2-dev libseccomp-dev \
> libspice-protocol-dev libspice-server-dev libusb-1.0-0-dev \
> libusbredirparser-dev texi2html texinfo xfslibs-dev && \
> mk-build-deps -ir && make


Which results in the binaries "/pve-qemu-kvm-5.1.0/pbs-restore" and "pve-qemu-kvm-5.1.0/debian/pve-qemu-kvm/usr/bin/pbs-restore" (What's their difference?)

Making pve-qemu requires "libproxmox-backup-qemu0".
"libproxmox-backup-qemu0" is either supplied by installing PVE...

> echo 'deb http://download.proxmox.com/debian/pve buster pvetest' >> \
> /etc/apt/sources.list.d/proxmox-devel.list && \
> apt-get update && apt-get dist-upgrade -y && \
> apt-get install proxmox-ve


... or by building it from source. I am interested about building it myself, of course. I guess this repository is what I need:
https://git.proxmox.com/?p=proxmox-backup-qemu.git;a=summary
But when I do ...

> cd ~ && git clone git://git.proxmox.com/git/proxmox-backup-qemu.git && \
> cd proxmox-backup-qemu && \
> # checkout a commit which seems to be compatible for v1.0.3, see #3173#c1 \
> git checkout 1e45883f00ca8b0dd04c84f4ae33752e69cfc5bb && \
> # need to install PVE too meet the dependencies for the next one: \
> mk-build-deps -ir && \
> # I can't meet all dependencies for the next one: \
> make


...with the "make" I get the following error message:

> error: no matching package named `cbindgen` found
> location searched: registry `https://github.com/rust-lang/crates.io-index`
> perhaps you meant: bindgen
> required by package `proxmox-backup-qemu v1.0.0 (/root/proxmox-backup-qemu)`
> make: *** [Makefile:22: all] Fehler 101


Where do I get "cbindgen" from? What's the correct way to build proxmox-backup-qemu?

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